FA-66082 / Aviation weight and balance / Member archive

Per-step moment removal omits fuel density · case 02

The CG drifts steadily in one direction during burn regardless of tank location.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

Input {'zfw','zfm','tanks':[[name,arm,gal]],'order':[names],'step','density'}. Fuel burns in 'order', one step (or the tank remainder, no carry) at a time; a tank listed again after being emptied burns nothing; unlisted tanks are unusable but their fuel stays on board. CG is sampled at start and after each step. Return [start CG, min CG, max CG, final CG] rounded 2.

Why this case matters

Tank burn sequence determines the CG trajectory in flight; the extreme CG can occur mid-sequence rather than at takeoff or landing.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
aux then mains	`[42.26, 42.26, 47.29, 47.29]`	`[42.26, 41.0, 42.26, 41.0]`	Failed

MEMBER ARCHIVE

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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