FAILURE MAP
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FA-66131 / Aviation weight and balance / Open access

Floor-pressure finding cites a per-compartment index · case 01

Load controllers are pointed at the wrong manifest line for over-pressure pieces.

Verified by executionVariant 1 · 9 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The PSF diagnostic counts pieces within the compartment instead of using the global manifest index.

THE FAILURE

The PSF diagnostic counts pieces within the compartment instead of using the global manifest index.

Unsuccessful approach: Switching to a one-based index is inconsistent with the other diagnostics.

Case contract

Input {'compartments':{name:[max lb, area sqft, max lb/sqft]},'pieces':[[compartment, lb, footprint sqft]]}. Per piece in order: unknown compartment -> 'UNKNOWN:i'; footprint <= 0 -> 'FOOTPRINT:i'; both exclude the piece from totals. Piece weight/footprint above the floor limit -> 'PSF:c:i' (piece still loaded). Then per compartment in sorted order, total above max -> 'OVER:c'. i is the zero-based index in the whole piece list.

Why this case matters

Hold loading is limited both by total compartment weight and by floor bearing pressure under each individual piece.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    comps = x['compartments']
    tot = {}
    out = []
    for i, (c, wt, fp) in enumerate(x['pieces']):
        if c not in comps:
            out.append('UNKNOWN:%d' % i)
            continue
        if fp <= 0:
            out.append('FOOTPRINT:%d' % i)
            continue
        if wt / fp > comps[c][2]:
            out.append('PSF:%s:%d' % (c, sum(1 for p in x['pieces'][:i] if p[0] == c)))
        tot[c] = tot.get(c, 0) + wt
    for c in sorted(tot):
        if tot[c] > comps[c][0]:
            out.append('OVER:%s' % c)
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 5.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.1], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1001, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 151, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 50, 1.0]]}, []], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 200, 13.8], ['FWD', 590, 13.1], ['AFT', 390, 8.0], ['AFT', 970, 10.3], ['FWD', 320, 5.7], ['FWD', 50, 0.6], ['MID', 840, 14.1]]}, ['PSF:AFT:3', 'UNKNOWN:6']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 650, 0.0]]}, ['UNKNOWN:0']], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 790, 8.8], ['FWD', 1180, 13.1], ['AFT', 770, 12.8], ['MID', 1020, 6.5]]}, ['UNKNOWN:3']]], [['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 6.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.2], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1002, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 152, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 100, 1.0]]}, []], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 400, 0.0], ['BULK', 270, 6.4], ['FWD', 420, 0.0], ['AFT', 300, 3.3], ['MID', 190, 3.2], ['AFT', 690, 12.9]]}, ['FOOTPRINT:0', 'FOOTPRINT:2', 'PSF:AFT:3', 'UNKNOWN:4']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 650, 0.0], ['MID', 930, 7.9], ['MID', 80, 0.0], ['BULK', 30, 0.3]]}, ['UNKNOWN:0', 'UNKNOWN:1', 'UNKNOWN:2', 'PSF:BULK:3']], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 580, 0.0], ['AFT', 780, 9.4], ['FWD', 860, 0.0], ['BULK', 630, 0.0]]}, ['FOOTPRINT:0', 'FOOTPRINT:2', 'FOOTPRINT:3']]], [['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 7.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.3], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1003, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 153, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 150, 1.0]]}, ['PSF:FWD:2']], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 750, 0.0]]}, ['FOOTPRINT:0']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 80, 0.9], ['BULK', 60, 11.6]]}, []], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 990, 11.5], ['FWD', 920, 14.9], ['FWD', 400, 5.3], ['FWD', 820, 0.0], ['MID', 260, 0.8]]}, ['PSF:BULK:0', 'FOOTPRINT:3', 'UNKNOWN:4', 'OVER:BULK']]], [['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 8.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.4], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1004, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 154, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 200, 1.0]]}, ['PSF:FWD:2']], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 630, 9.8], ['FWD', 1030, 17.2], ['BULK', 900, 0.0], ['FWD', 650, 10.8], ['FWD', 960, 16.0], ['BULK', 480, 5.3]]}, ['PSF:BULK:0', 'FOOTPRINT:2', 'PSF:BULK:5', 'OVER:BULK', 'OVER:FWD']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 190, 11.6], ['BULK', 360, 4.0]]}, ['PSF:BULK:1']], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 1190, 9.0], ['AFT', 470, 4.7]]}, ['UNKNOWN:0', 'PSF:AFT:1']]], [['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 9.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.5], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1005, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 155, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 250, 1.0]]}, ['PSF:FWD:2']], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 910, 0.0], ['AFT', 890, 1.7], ['FWD', 750, 8.3], ['FWD', 1060, 17.7], ['AFT', 160, 0.0], ['AFT', 1180, 19.7], ['BULK', 440, 5.9]]}, ['FOOTPRINT:0', 'PSF:AFT:1', 'FOOTPRINT:4', 'PSF:BULK:6', 'OVER:FWD']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 290, 12.8], ['FWD', 660, 0.0], ['BULK', 170, 8.9], ['FWD', 590, 6.6], ['AFT', 520, 5.2], ['FWD', 460, 8.4], ['BULK', 60, 0.6]]}, ['FOOTPRINT:1', 'PSF:AFT:4', 'PSF:BULK:6']], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 900, 10.0], ['FWD', 1020, 11.3], ['AFT', 410, 6.8], ['MID', 280, 0.9], ['AFT', 770, 0.0], ['MID', 560, 0.0], ['FWD', 990, 16.5]]}, ['UNKNOWN:0', 'UNKNOWN:3', 'FOOTPRINT:4', 'UNKNOWN:5', 'OVER:FWD']]]]
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 fixtureActualExpectedOutcome
clean load[][]Passed
dense engine part['PSF:FWD:0']['PSF:FWD:0']Passed
compartment exactly full[][]Passed
compartment overloaded['OVER:AFT']['OVER:AFT']Passed
unknown and bad footprint['UNKNOWN:0', 'FOOTPRINT:1']['UNKNOWN:0', 'FOOTPRINT:1']Passed
floor limit exactly met[][]Passed
sampled case 1['PSF:AFT:2', 'UNKNOWN:6']['PSF:AFT:3', 'UNKNOWN:6']Failed
sampled case 2['UNKNOWN:0']['UNKNOWN:0']Passed
sampled case 3['UNKNOWN:3']['UNKNOWN:3']Passed

SHA-256 / fd964efe231cd9bf924365fc63c989bec070ba85454aea771b76b3538d02c6b3

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    comps = x['compartments']
    tot = {}
    out = []
    for i, (c, wt, fp) in enumerate(x['pieces']):
        if c not in comps:
            out.append('UNKNOWN:%d' % i)
            continue
        if fp <= 0:
            out.append('FOOTPRINT:%d' % i)
            continue
        if wt / fp > comps[c][2]:
            out.append('PSF:%s:%d' % (c, i + 1))
        tot[c] = tot.get(c, 0) + wt
    for c in sorted(tot):
        if tot[c] > comps[c][0]:
            out.append('OVER:%s' % c)
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 5.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.1], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1001, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 151, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 50, 1.0]]}, []], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 200, 13.8], ['FWD', 590, 13.1], ['AFT', 390, 8.0], ['AFT', 970, 10.3], ['FWD', 320, 5.7], ['FWD', 50, 0.6], ['MID', 840, 14.1]]}, ['PSF:AFT:3', 'UNKNOWN:6']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 650, 0.0]]}, ['UNKNOWN:0']], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 790, 8.8], ['FWD', 1180, 13.1], ['AFT', 770, 12.8], ['MID', 1020, 6.5]]}, ['UNKNOWN:3']]], [['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 6.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.2], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1002, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 152, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 100, 1.0]]}, []], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 400, 0.0], ['BULK', 270, 6.4], ['FWD', 420, 0.0], ['AFT', 300, 3.3], ['MID', 190, 3.2], ['AFT', 690, 12.9]]}, ['FOOTPRINT:0', 'FOOTPRINT:2', 'PSF:AFT:3', 'UNKNOWN:4']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 650, 0.0], ['MID', 930, 7.9], ['MID', 80, 0.0], ['BULK', 30, 0.3]]}, ['UNKNOWN:0', 'UNKNOWN:1', 'UNKNOWN:2', 'PSF:BULK:3']], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 580, 0.0], ['AFT', 780, 9.4], ['FWD', 860, 0.0], ['BULK', 630, 0.0]]}, ['FOOTPRINT:0', 'FOOTPRINT:2', 'FOOTPRINT:3']]], [['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 7.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.3], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1003, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 153, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 150, 1.0]]}, ['PSF:FWD:2']], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 750, 0.0]]}, ['FOOTPRINT:0']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 80, 0.9], ['BULK', 60, 11.6]]}, []], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 990, 11.5], ['FWD', 920, 14.9], ['FWD', 400, 5.3], ['FWD', 820, 0.0], ['MID', 260, 0.8]]}, ['PSF:BULK:0', 'FOOTPRINT:3', 'UNKNOWN:4', 'OVER:BULK']]], [['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 8.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.4], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1004, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 154, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 200, 1.0]]}, ['PSF:FWD:2']], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 630, 9.8], ['FWD', 1030, 17.2], ['BULK', 900, 0.0], ['FWD', 650, 10.8], ['FWD', 960, 16.0], ['BULK', 480, 5.3]]}, ['PSF:BULK:0', 'FOOTPRINT:2', 'PSF:BULK:5', 'OVER:BULK', 'OVER:FWD']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 190, 11.6], ['BULK', 360, 4.0]]}, ['PSF:BULK:1']], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 1190, 9.0], ['AFT', 470, 4.7]]}, ['UNKNOWN:0', 'PSF:AFT:1']]], [['clean load', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 400, 8.0], ['AFT', 900, 12.0], ['BULK', 200, 9.0]]}, []], ['dense engine part', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['FWD', 300, 2.5], ['FWD', 500, 10.0]]}, ['PSF:FWD:0']], ['compartment exactly full', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['BULK', 500, 10.0], ['BULK', 300, 6.0]]}, []], ['compartment overloaded', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 1200, 20.0], ['AFT', 1005, 20.0], ['FWD', 100, 2.0]]}, ['OVER:AFT']], ['unknown and bad footprint', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 100, 2.0], ['BULK', 700, 0.0], ['BULK', 155, 3.0]]}, ['UNKNOWN:0', 'FOOTPRINT:1']], ['floor limit exactly met', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 450, 5.0], ['BULK', 120, 2.0], ['FWD', 250, 1.0]]}, ['PSF:FWD:2']], ['sampled case 1', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 910, 0.0], ['AFT', 890, 1.7], ['FWD', 750, 8.3], ['FWD', 1060, 17.7], ['AFT', 160, 0.0], ['AFT', 1180, 19.7], ['BULK', 440, 5.9]]}, ['FOOTPRINT:0', 'PSF:AFT:1', 'FOOTPRINT:4', 'PSF:BULK:6', 'OVER:FWD']], ['sampled case 2', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['AFT', 290, 12.8], ['FWD', 660, 0.0], ['BULK', 170, 8.9], ['FWD', 590, 6.6], ['AFT', 520, 5.2], ['FWD', 460, 8.4], ['BULK', 60, 0.6]]}, ['FOOTPRINT:1', 'PSF:AFT:4', 'PSF:BULK:6']], ['sampled case 3', {'compartments': {'FWD': [1500, 40.0, 100.0], 'AFT': [2200, 55.0, 90.0], 'BULK': [800, 20.0, 60.0]}, 'pieces': [['MID', 900, 10.0], ['FWD', 1020, 11.3], ['AFT', 410, 6.8], ['MID', 280, 0.9], ['AFT', 770, 0.0], ['MID', 560, 0.0], ['FWD', 990, 16.5]]}, ['UNKNOWN:0', 'UNKNOWN:3', 'FOOTPRINT:4', 'UNKNOWN:5', 'OVER:FWD']]]]
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 fixtureActualExpectedOutcome
clean load[][]Passed
dense engine part['PSF:FWD:1']['PSF:FWD:0']Failed
compartment exactly full[][]Passed
compartment overloaded['OVER:AFT']['OVER:AFT']Passed
unknown and bad footprint['UNKNOWN:0', 'FOOTPRINT:1']['UNKNOWN:0', 'FOOTPRINT:1']Passed
floor limit exactly met[][]Passed
sampled case 1['PSF:AFT:4', 'UNKNOWN:6']['PSF:AFT:3', 'UNKNOWN:6']Failed
sampled case 2['UNKNOWN:0']['UNKNOWN:0']Passed
sampled case 3['UNKNOWN:3']['UNKNOWN:3']Passed

SHA-256 / 252952f800d5f306dc043aa46a9193e408ae5b9cd2afa5f9fc20d484597b2650

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 9 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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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 2026-09-29T14:47:40.419034+00:00.

Case digest / fe4886f624a1eec721f45dfeb1f7974a79c07d25696c8d2f6c1e57c45ab16726