FA-66246 / Aviation weight and balance / Open access

Oil added when it was already in the engine · case 01

Weighings done with full oil show the oil counted twice, and drained weighings show none.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The oil correction condition is inverted.

VERIFIED REPAIR

Add full oil only when it was drained before weighing.

Unsuccessful approach: Adding oil whenever a quantity is listed double-counts oil for undrained weighings.

Case contract

Input {'scales':[[position, reading lb, tare lb, arm]],'unusable_gal','fuel_arm','oil_qt','oil_arm','oil_drained'}. Aircraft weighed defueled, so unusable fuel (6.0 lb/gal) is added; full oil (1.875 lb per quart) is added only if the oil was drained for weighing. Return [basic empty weight r1, arm r2].

Why this case matters

A weighing report derives basic empty weight from net scale readings, then adjusts for fluids to the defined empty-weight configuration.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    w = 0.0
    m = 0.0
    for pos, reading, tare, arm in x['scales']:
        net = reading - tare
        w += net
        m += net * arm
    uf = x['unusable_gal'] * 6.0
    w += uf
    m += uf * x['fuel_arm']
    if not x['oil_drained']:
        ow = x['oil_qt'] * 1.875
        w += ow
        m += ow * x['oil_arm']
    return [round(w, 1), round(m / w, 2)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 616.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1657.0, 46.85]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 616.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1642.0, 47.4]], ['heavy tare chocks', {'scales': [['nose', 500.0, 41.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2223.2, 59.09]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 91.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1496.0, 21.66]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 616.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1633.0, 46.86]], ['sampled case 1', {'scales': [['a', 1000.1, 34.9, 44.2], ['b', 1008.2, 17.4, 160.1], ['c', 1163.7, 11.1, 128.8]], 'unusable_gal': 4.6, 'fuel_arm': 49.0, 'oil_qt': 7.0, 'oil_arm': -5.3, 'oil_drained': False}, [3136.2, 111.95]], ['sampled case 2', {'scales': [['a', 422.2, 11.5, 138.0], ['b', 841.0, 27.2, 36.1], ['c', 445.3, 30.0, 91.0]], 'unusable_gal': 4.0, 'fuel_arm': 38.2, 'oil_qt': 7.0, 'oil_arm': -10.7, 'oil_drained': True}, [1676.9, 74.32]], ['sampled case 3', {'scales': [['a', 420.1, 2.5, 211.4], ['b', 699.8, 35.2, 56.2], ['c', 1010.7, 32.1, 150.2]], 'unusable_gal': 0.7, 'fuel_arm': 33.6, 'oil_qt': 8.0, 'oil_arm': -11.9, 'oil_drained': True}, [2080.0, 131.05]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 617.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1658.0, 46.85]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 617.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1643.0, 47.41]], ['heavy tare chocks', {'scales': [['nose', 500.0, 42.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2222.2, 59.11]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 92.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1497.0, 21.78]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 617.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 9.0, 'oil_arm': -14.0, 'oil_drained': True}, [1635.9, 46.8]], ['sampled case 1', {'scales': [['a', 209.0, 36.3, 1.9], ['b', 1031.8, 6.6, 35.6], ['c', 836.8, 6.6, 4.5]], 'unusable_gal': 5.6, 'fuel_arm': 36.8, 'oil_qt': 9.0, 'oil_arm': -30.7, 'oil_drained': False}, [2061.7, 20.27]], ['sampled case 2', {'scales': [['a', 161.8, 14.1, 203.6], ['b', 1096.4, 24.1, 42.9], ['c', 1188.6, 38.1, 45.0]], 'unusable_gal': 3.1, 'fuel_arm': 32.3, 'oil_qt': 10.0, 'oil_arm': -33.0, 'oil_drained': True}, [2407.8, 53.09]], ['sampled case 3', {'scales': [['a', 570.2, 4.5, 117.2], ['b', 466.2, 0.5, 18.5], ['c', 732.8, 32.6, 102.0]], 'unusable_gal': 1.1, 'fuel_arm': 41.1, 'oil_qt': 11.0, 'oil_arm': -27.4, 'oil_drained': True}, [1758.8, 83.03]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 618.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1659.0, 46.86]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 618.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1644.0, 47.41]], ['heavy tare chocks', {'scales': [['nose', 500.0, 43.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2221.2, 59.13]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 93.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1498.0, 21.91]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 618.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 10.0, 'oil_arm': -14.0, 'oil_drained': True}, [1638.8, 46.73]], ['sampled case 1', {'scales': [['a', 1119.6, 30.2, 155.2], ['b', 917.6, 8.6, 162.8], ['c', 346.2, 25.9, 160.8]], 'unusable_gal': 2.9, 'fuel_arm': 32.7, 'oil_qt': 5.0, 'oil_arm': -29.3, 'oil_drained': True}, [2345.5, 157.26]], ['sampled case 2', {'scales': [['a', 238.5, 26.8, 26.6], ['b', 996.7, 12.2, 100.6], ['c', 640.1, 19.7, 96.5]], 'unusable_gal': 4.8, 'fuel_arm': 49.4, 'oil_qt': 9.0, 'oil_arm': -2.1, 'oil_drained': False}, [1845.4, 89.93]], ['sampled case 3', {'scales': [['a', 356.4, 5.4, 59.0], ['b', 680.4, 31.1, 173.8], ['c', 1099.1, 31.6, 114.7]], 'unusable_gal': 2.8, 'fuel_arm': 36.7, 'oil_qt': 5.0, 'oil_arm': -6.0, 'oil_drained': True}, [2094.0, 122.52]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 619.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1660.0, 46.87]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 619.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1645.0, 47.42]], ['heavy tare chocks', {'scales': [['nose', 500.0, 44.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2220.2, 59.15]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 94.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1499.0, 22.03]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 619.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 11.0, 'oil_arm': -14.0, 'oil_drained': True}, [1641.6, 46.67]], ['sampled case 1', {'scales': [['a', 265.1, 30.9, 27.6], ['b', 430.8, 39.1, 1.5], ['c', 941.9, 13.3, 25.9]], 'unusable_gal': 1.8, 'fuel_arm': 34.2, 'oil_qt': 9.0, 'oil_arm': -17.3, 'oil_drained': True}, [1582.2, 19.71]], ['sampled case 2', {'scales': [['a', 1082.3, 8.0, 3.0], ['b', 860.6, 5.8, 182.4], ['c', 204.5, 33.3, 145.0]], 'unusable_gal': 2.2, 'fuel_arm': 38.1, 'oil_qt': 8.0, 'oil_arm': -12.6, 'oil_drained': False}, [2113.5, 87.28]], ['sampled case 3', {'scales': [['a', 128.4, 13.3, 62.8], ['b', 1160.7, 25.9, 219.6], ['c', 114.4, 29.0, 44.2]], 'unusable_gal': 5.2, 'fuel_arm': 50.0, 'oil_qt': 10.0, 'oil_arm': -31.5, 'oil_drained': False}, [1366.5, 191.56]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 620.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1661.0, 46.87]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 620.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1646.0, 47.43]], ['heavy tare chocks', {'scales': [['nose', 500.0, 45.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2219.2, 59.16]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 95.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1500.0, 22.16]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 620.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 12.0, 'oil_arm': -14.0, 'oil_drained': True}, [1644.5, 46.61]], ['sampled case 1', {'scales': [['a', 197.7, 24.6, 204.9], ['b', 255.4, 23.8, 17.0], ['c', 414.4, 28.3, 205.0]], 'unusable_gal': 4.9, 'fuel_arm': 35.4, 'oil_qt': 6.0, 'oil_arm': -13.9, 'oil_drained': False}, [820.2, 145.81]], ['sampled case 2', {'scales': [['a', 456.6, 5.2, 115.6], ['b', 456.8, 15.4, 142.9], ['c', 235.6, 28.5, 24.6]], 'unusable_gal': 1.8, 'fuel_arm': 30.9, 'oil_qt': 9.0, 'oil_arm': -23.6, 'oil_drained': False}, [1110.7, 108.66]], ['sampled case 3', {'scales': [['a', 368.2, 39.1, 22.1], ['b', 1151.8, 5.7, 143.2], ['c', 467.9, 24.2, 111.6]], 'unusable_gal': 2.1, 'fuel_arm': 49.7, 'oil_qt': 10.0, 'oil_arm': -27.5, 'oil_drained': False}, [1931.5, 114.7]]]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
defueled oil drained	`[1642.0, 47.4]`	`[1657.0, 46.85]`	Failed
defueled oil full	`[1657.0, 46.85]`	`[1642.0, 47.4]`	Failed
heavy tare chocks	`[2212.0, 59.45]`	`[2223.2, 59.09]`	Failed
tailwheel aircraft	`[1518.5, 20.89]`	`[1496.0, 21.66]`	Failed
no unusable fuel	`[1618.0, 47.42]`	`[1633.0, 46.86]`	Failed
sampled case 1	`[3149.3, 111.46]`	`[3136.2, 111.95]`	Failed
sampled case 2	`[1663.8, 74.99]`	`[1676.9, 74.32]`	Failed
sampled case 3	`[2065.0, 132.09]`	`[2080.0, 131.05]`	Failed

SHA-256 / e526463d00fad229307a21ed39c0d1088ed81c5fda06dec6768ba5d903c56dac

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    w = 0.0
    m = 0.0
    for pos, reading, tare, arm in x['scales']:
        net = reading - tare
        w += net
        m += net * arm
    uf = x['unusable_gal'] * 6.0
    w += uf
    m += uf * x['fuel_arm']
    if x['oil_qt'] > 0:
        ow = x['oil_qt'] * 1.875
        w += ow
        m += ow * x['oil_arm']
    return [round(w, 1), round(m / w, 2)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 616.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1657.0, 46.85]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 616.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1642.0, 47.4]], ['heavy tare chocks', {'scales': [['nose', 500.0, 41.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2223.2, 59.09]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 91.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1496.0, 21.66]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 616.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1633.0, 46.86]], ['sampled case 1', {'scales': [['a', 1000.1, 34.9, 44.2], ['b', 1008.2, 17.4, 160.1], ['c', 1163.7, 11.1, 128.8]], 'unusable_gal': 4.6, 'fuel_arm': 49.0, 'oil_qt': 7.0, 'oil_arm': -5.3, 'oil_drained': False}, [3136.2, 111.95]], ['sampled case 2', {'scales': [['a', 422.2, 11.5, 138.0], ['b', 841.0, 27.2, 36.1], ['c', 445.3, 30.0, 91.0]], 'unusable_gal': 4.0, 'fuel_arm': 38.2, 'oil_qt': 7.0, 'oil_arm': -10.7, 'oil_drained': True}, [1676.9, 74.32]], ['sampled case 3', {'scales': [['a', 420.1, 2.5, 211.4], ['b', 699.8, 35.2, 56.2], ['c', 1010.7, 32.1, 150.2]], 'unusable_gal': 0.7, 'fuel_arm': 33.6, 'oil_qt': 8.0, 'oil_arm': -11.9, 'oil_drained': True}, [2080.0, 131.05]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 617.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1658.0, 46.85]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 617.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1643.0, 47.41]], ['heavy tare chocks', {'scales': [['nose', 500.0, 42.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2222.2, 59.11]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 92.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1497.0, 21.78]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 617.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 9.0, 'oil_arm': -14.0, 'oil_drained': True}, [1635.9, 46.8]], ['sampled case 1', {'scales': [['a', 209.0, 36.3, 1.9], ['b', 1031.8, 6.6, 35.6], ['c', 836.8, 6.6, 4.5]], 'unusable_gal': 5.6, 'fuel_arm': 36.8, 'oil_qt': 9.0, 'oil_arm': -30.7, 'oil_drained': False}, [2061.7, 20.27]], ['sampled case 2', {'scales': [['a', 161.8, 14.1, 203.6], ['b', 1096.4, 24.1, 42.9], ['c', 1188.6, 38.1, 45.0]], 'unusable_gal': 3.1, 'fuel_arm': 32.3, 'oil_qt': 10.0, 'oil_arm': -33.0, 'oil_drained': True}, [2407.8, 53.09]], ['sampled case 3', {'scales': [['a', 570.2, 4.5, 117.2], ['b', 466.2, 0.5, 18.5], ['c', 732.8, 32.6, 102.0]], 'unusable_gal': 1.1, 'fuel_arm': 41.1, 'oil_qt': 11.0, 'oil_arm': -27.4, 'oil_drained': True}, [1758.8, 83.03]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 618.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1659.0, 46.86]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 618.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1644.0, 47.41]], ['heavy tare chocks', {'scales': [['nose', 500.0, 43.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2221.2, 59.13]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 93.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1498.0, 21.91]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 618.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 10.0, 'oil_arm': -14.0, 'oil_drained': True}, [1638.8, 46.73]], ['sampled case 1', {'scales': [['a', 1119.6, 30.2, 155.2], ['b', 917.6, 8.6, 162.8], ['c', 346.2, 25.9, 160.8]], 'unusable_gal': 2.9, 'fuel_arm': 32.7, 'oil_qt': 5.0, 'oil_arm': -29.3, 'oil_drained': True}, [2345.5, 157.26]], ['sampled case 2', {'scales': [['a', 238.5, 26.8, 26.6], ['b', 996.7, 12.2, 100.6], ['c', 640.1, 19.7, 96.5]], 'unusable_gal': 4.8, 'fuel_arm': 49.4, 'oil_qt': 9.0, 'oil_arm': -2.1, 'oil_drained': False}, [1845.4, 89.93]], ['sampled case 3', {'scales': [['a', 356.4, 5.4, 59.0], ['b', 680.4, 31.1, 173.8], ['c', 1099.1, 31.6, 114.7]], 'unusable_gal': 2.8, 'fuel_arm': 36.7, 'oil_qt': 5.0, 'oil_arm': -6.0, 'oil_drained': True}, [2094.0, 122.52]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 619.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1660.0, 46.87]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 619.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1645.0, 47.42]], ['heavy tare chocks', {'scales': [['nose', 500.0, 44.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2220.2, 59.15]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 94.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1499.0, 22.03]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 619.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 11.0, 'oil_arm': -14.0, 'oil_drained': True}, [1641.6, 46.67]], ['sampled case 1', {'scales': [['a', 265.1, 30.9, 27.6], ['b', 430.8, 39.1, 1.5], ['c', 941.9, 13.3, 25.9]], 'unusable_gal': 1.8, 'fuel_arm': 34.2, 'oil_qt': 9.0, 'oil_arm': -17.3, 'oil_drained': True}, [1582.2, 19.71]], ['sampled case 2', {'scales': [['a', 1082.3, 8.0, 3.0], ['b', 860.6, 5.8, 182.4], ['c', 204.5, 33.3, 145.0]], 'unusable_gal': 2.2, 'fuel_arm': 38.1, 'oil_qt': 8.0, 'oil_arm': -12.6, 'oil_drained': False}, [2113.5, 87.28]], ['sampled case 3', {'scales': [['a', 128.4, 13.3, 62.8], ['b', 1160.7, 25.9, 219.6], ['c', 114.4, 29.0, 44.2]], 'unusable_gal': 5.2, 'fuel_arm': 50.0, 'oil_qt': 10.0, 'oil_arm': -31.5, 'oil_drained': False}, [1366.5, 191.56]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 620.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1661.0, 46.87]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 620.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1646.0, 47.43]], ['heavy tare chocks', {'scales': [['nose', 500.0, 45.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2219.2, 59.16]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 95.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1500.0, 22.16]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 620.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 12.0, 'oil_arm': -14.0, 'oil_drained': True}, [1644.5, 46.61]], ['sampled case 1', {'scales': [['a', 197.7, 24.6, 204.9], ['b', 255.4, 23.8, 17.0], ['c', 414.4, 28.3, 205.0]], 'unusable_gal': 4.9, 'fuel_arm': 35.4, 'oil_qt': 6.0, 'oil_arm': -13.9, 'oil_drained': False}, [820.2, 145.81]], ['sampled case 2', {'scales': [['a', 456.6, 5.2, 115.6], ['b', 456.8, 15.4, 142.9], ['c', 235.6, 28.5, 24.6]], 'unusable_gal': 1.8, 'fuel_arm': 30.9, 'oil_qt': 9.0, 'oil_arm': -23.6, 'oil_drained': False}, [1110.7, 108.66]], ['sampled case 3', {'scales': [['a', 368.2, 39.1, 22.1], ['b', 1151.8, 5.7, 143.2], ['c', 467.9, 24.2, 111.6]], 'unusable_gal': 2.1, 'fuel_arm': 49.7, 'oil_qt': 10.0, 'oil_arm': -27.5, 'oil_drained': False}, [1931.5, 114.7]]]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
defueled oil drained	`[1657.0, 46.85]`	`[1657.0, 46.85]`	Passed
defueled oil full	`[1657.0, 46.85]`	`[1642.0, 47.4]`	Failed
heavy tare chocks	`[2223.2, 59.09]`	`[2223.2, 59.09]`	Passed
tailwheel aircraft	`[1518.5, 20.89]`	`[1496.0, 21.66]`	Failed
no unusable fuel	`[1633.0, 46.86]`	`[1633.0, 46.86]`	Passed
sampled case 1	`[3149.3, 111.46]`	`[3136.2, 111.95]`	Failed
sampled case 2	`[1676.9, 74.32]`	`[1676.9, 74.32]`	Passed
sampled case 3	`[2080.0, 131.05]`	`[2080.0, 131.05]`	Passed

SHA-256 / 0a7faab200e8cb1fcd4b66fc65cfcd5e810f31ab8956c428d4ef08309b316afb

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    w = 0.0
    m = 0.0
    for pos, reading, tare, arm in x['scales']:
        net = reading - tare
        w += net
        m += net * arm
    uf = x['unusable_gal'] * 6.0
    w += uf
    m += uf * x['fuel_arm']
    if x['oil_drained']:
        ow = x['oil_qt'] * 1.875
        w += ow
        m += ow * x['oil_arm']
    return [round(w, 1), round(m / w, 2)]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 616.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1657.0, 46.85]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 616.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1642.0, 47.4]], ['heavy tare chocks', {'scales': [['nose', 500.0, 41.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2223.2, 59.09]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 91.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1496.0, 21.66]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 616.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1633.0, 46.86]], ['sampled case 1', {'scales': [['a', 1000.1, 34.9, 44.2], ['b', 1008.2, 17.4, 160.1], ['c', 1163.7, 11.1, 128.8]], 'unusable_gal': 4.6, 'fuel_arm': 49.0, 'oil_qt': 7.0, 'oil_arm': -5.3, 'oil_drained': False}, [3136.2, 111.95]], ['sampled case 2', {'scales': [['a', 422.2, 11.5, 138.0], ['b', 841.0, 27.2, 36.1], ['c', 445.3, 30.0, 91.0]], 'unusable_gal': 4.0, 'fuel_arm': 38.2, 'oil_qt': 7.0, 'oil_arm': -10.7, 'oil_drained': True}, [1676.9, 74.32]], ['sampled case 3', {'scales': [['a', 420.1, 2.5, 211.4], ['b', 699.8, 35.2, 56.2], ['c', 1010.7, 32.1, 150.2]], 'unusable_gal': 0.7, 'fuel_arm': 33.6, 'oil_qt': 8.0, 'oil_arm': -11.9, 'oil_drained': True}, [2080.0, 131.05]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 617.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1658.0, 46.85]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 617.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1643.0, 47.41]], ['heavy tare chocks', {'scales': [['nose', 500.0, 42.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2222.2, 59.11]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 92.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1497.0, 21.78]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 617.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 9.0, 'oil_arm': -14.0, 'oil_drained': True}, [1635.9, 46.8]], ['sampled case 1', {'scales': [['a', 209.0, 36.3, 1.9], ['b', 1031.8, 6.6, 35.6], ['c', 836.8, 6.6, 4.5]], 'unusable_gal': 5.6, 'fuel_arm': 36.8, 'oil_qt': 9.0, 'oil_arm': -30.7, 'oil_drained': False}, [2061.7, 20.27]], ['sampled case 2', {'scales': [['a', 161.8, 14.1, 203.6], ['b', 1096.4, 24.1, 42.9], ['c', 1188.6, 38.1, 45.0]], 'unusable_gal': 3.1, 'fuel_arm': 32.3, 'oil_qt': 10.0, 'oil_arm': -33.0, 'oil_drained': True}, [2407.8, 53.09]], ['sampled case 3', {'scales': [['a', 570.2, 4.5, 117.2], ['b', 466.2, 0.5, 18.5], ['c', 732.8, 32.6, 102.0]], 'unusable_gal': 1.1, 'fuel_arm': 41.1, 'oil_qt': 11.0, 'oil_arm': -27.4, 'oil_drained': True}, [1758.8, 83.03]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 618.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1659.0, 46.86]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 618.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1644.0, 47.41]], ['heavy tare chocks', {'scales': [['nose', 500.0, 43.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2221.2, 59.13]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 93.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1498.0, 21.91]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 618.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 10.0, 'oil_arm': -14.0, 'oil_drained': True}, [1638.8, 46.73]], ['sampled case 1', {'scales': [['a', 1119.6, 30.2, 155.2], ['b', 917.6, 8.6, 162.8], ['c', 346.2, 25.9, 160.8]], 'unusable_gal': 2.9, 'fuel_arm': 32.7, 'oil_qt': 5.0, 'oil_arm': -29.3, 'oil_drained': True}, [2345.5, 157.26]], ['sampled case 2', {'scales': [['a', 238.5, 26.8, 26.6], ['b', 996.7, 12.2, 100.6], ['c', 640.1, 19.7, 96.5]], 'unusable_gal': 4.8, 'fuel_arm': 49.4, 'oil_qt': 9.0, 'oil_arm': -2.1, 'oil_drained': False}, [1845.4, 89.93]], ['sampled case 3', {'scales': [['a', 356.4, 5.4, 59.0], ['b', 680.4, 31.1, 173.8], ['c', 1099.1, 31.6, 114.7]], 'unusable_gal': 2.8, 'fuel_arm': 36.7, 'oil_qt': 5.0, 'oil_arm': -6.0, 'oil_drained': True}, [2094.0, 122.52]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 619.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1660.0, 46.87]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 619.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1645.0, 47.42]], ['heavy tare chocks', {'scales': [['nose', 500.0, 44.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2220.2, 59.15]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 94.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1499.0, 22.03]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 619.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 11.0, 'oil_arm': -14.0, 'oil_drained': True}, [1641.6, 46.67]], ['sampled case 1', {'scales': [['a', 265.1, 30.9, 27.6], ['b', 430.8, 39.1, 1.5], ['c', 941.9, 13.3, 25.9]], 'unusable_gal': 1.8, 'fuel_arm': 34.2, 'oil_qt': 9.0, 'oil_arm': -17.3, 'oil_drained': True}, [1582.2, 19.71]], ['sampled case 2', {'scales': [['a', 1082.3, 8.0, 3.0], ['b', 860.6, 5.8, 182.4], ['c', 204.5, 33.3, 145.0]], 'unusable_gal': 2.2, 'fuel_arm': 38.1, 'oil_qt': 8.0, 'oil_arm': -12.6, 'oil_drained': False}, [2113.5, 87.28]], ['sampled case 3', {'scales': [['a', 128.4, 13.3, 62.8], ['b', 1160.7, 25.9, 219.6], ['c', 114.4, 29.0, 44.2]], 'unusable_gal': 5.2, 'fuel_arm': 50.0, 'oil_qt': 10.0, 'oil_arm': -31.5, 'oil_drained': False}, [1366.5, 191.56]]], [['defueled oil drained', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 620.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': True}, [1661.0, 46.87]], ['defueled oil full', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 620.0, 8.0, 58.0]], 'unusable_gal': 4.0, 'fuel_arm': 46.0, 'oil_qt': 8.0, 'oil_arm': -14.0, 'oil_drained': False}, [1646.0, 47.43]], ['heavy tare chocks', {'scales': [['nose', 500.0, 45.0, 20.0], ['left', 900.0, 35.0, 70.0], ['right', 905.0, 35.0, 70.0]], 'unusable_gal': 3.0, 'fuel_arm': 48.0, 'oil_qt': 6.0, 'oil_arm': -10.0, 'oil_drained': True}, [2219.2, 59.16]], ['tailwheel aircraft', {'scales': [['left', 700.0, 0.0, 10.0], ['right', 698.0, 0.0, 10.0], ['tail', 95.0, 5.0, 210.0]], 'unusable_gal': 2.0, 'fuel_arm': 30.0, 'oil_qt': 12.0, 'oil_arm': -30.0, 'oil_drained': False}, [1500.0, 22.16]], ['no unusable fuel', {'scales': [['nose', 410.0, 12.0, 15.0], ['left', 620.0, 8.0, 58.0], ['right', 620.0, 8.0, 58.0]], 'unusable_gal': 0.0, 'fuel_arm': 46.0, 'oil_qt': 12.0, 'oil_arm': -14.0, 'oil_drained': True}, [1644.5, 46.61]], ['sampled case 1', {'scales': [['a', 197.7, 24.6, 204.9], ['b', 255.4, 23.8, 17.0], ['c', 414.4, 28.3, 205.0]], 'unusable_gal': 4.9, 'fuel_arm': 35.4, 'oil_qt': 6.0, 'oil_arm': -13.9, 'oil_drained': False}, [820.2, 145.81]], ['sampled case 2', {'scales': [['a', 456.6, 5.2, 115.6], ['b', 456.8, 15.4, 142.9], ['c', 235.6, 28.5, 24.6]], 'unusable_gal': 1.8, 'fuel_arm': 30.9, 'oil_qt': 9.0, 'oil_arm': -23.6, 'oil_drained': False}, [1110.7, 108.66]], ['sampled case 3', {'scales': [['a', 368.2, 39.1, 22.1], ['b', 1151.8, 5.7, 143.2], ['c', 467.9, 24.2, 111.6]], 'unusable_gal': 2.1, 'fuel_arm': 49.7, 'oil_qt': 10.0, 'oil_arm': -27.5, 'oil_drained': False}, [1931.5, 114.7]]]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
defueled oil drained	`[1657.0, 46.85]`	`[1657.0, 46.85]`	Passed
defueled oil full	`[1642.0, 47.4]`	`[1642.0, 47.4]`	Passed
heavy tare chocks	`[2223.2, 59.09]`	`[2223.2, 59.09]`	Passed
tailwheel aircraft	`[1496.0, 21.66]`	`[1496.0, 21.66]`	Passed
no unusable fuel	`[1633.0, 46.86]`	`[1633.0, 46.86]`	Passed
sampled case 1	`[3136.2, 111.95]`	`[3136.2, 111.95]`	Passed
sampled case 2	`[1676.9, 74.32]`	`[1676.9, 74.32]`	Passed
sampled case 3	`[2080.0, 131.05]`	`[2080.0, 131.05]`	Passed

SHA-256 / ed65fe476ff1cec3dc6308e33be49fc733439afa4cdd54ac846bbf416621aeeb

Verification & scope

A deterministic toy loading model with stipulated constants; it is not an approved aircraft flight manual procedure and makes no claim of regulatory conformance. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:47:41.501497+00:00.

Case digest / 8108c8c21bf9e3a9ff2b6bf292c7fa668e0d802910535372a31a38c4bd72a410