FA-66339 / Aviation weight and balance / Member archive

Unrounded density leaks float noise into the order · case 04

The density echoed on the fuel slip shows values like 6.6400000000000001 and gallon orders differ from the slip.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Input {'temp_c','target_lb','onboard_gal','capacity_gal'}. Jet fuel density = 6.7 - 0.004*(T-15) lb/gal rounded to 3 decimals. Uplift gallons = target/density - onboard, rounded UP to whole gallons (after clearing noise); none needed -> [density, 0]; onboard+uplift above capacity -> 'ERR_CAPACITY'.

Why this case matters

Fuel is ordered in volume but planned in weight; the conversion depends on temperature-corrected density and must not short-fuel the aircraft.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
warm day uplift	`[6.640000000000001, 1468]`	`[6.64, 1468]`	Failed

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