FA-65979 / Aviation weight and balance / Member archive

Binary float noise bumps exact shifts up a pound · case 04

A shift that should be exactly 18 lb is reported as 19 lb.

Member previewVariant 4 · 3 implementations · 10 checks per implementation

Case contract

Input [total lb, current CG, target CG, from-station arm, to-station arm]. Weight to move = W*dCG/dArm, rounded UP to a whole pound after clearing float noise at 6 decimals. Same station -> 'ERR_SAME_STATION'; zero dCG -> 0; a move that shifts CG the wrong way -> 'ERR_DIRECTION'.

Why this case matters

The weight-shift formula moves existing load between stations without changing total weight; the answer must be conservative (rounded up).

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: float noise before ceiling	`608`	`607`	Failed

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