FA-65984 / Aviation weight and balance / Member archive

Already-at-target request reported as a direction error · case 04

Asking to reach the CG the aircraft already has returns ERR_DIRECTION for aft station moves.

Member previewVariant 4 · 3 implementations · 9 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
already at target	`"ERR_DIRECTION"`	`0`	Failed

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