FA-65989 / Aviation weight and balance / Member archive

Ballast sized to reach the opposite limit · case 04

An aft-CG aircraft is ballasted all the way to the forward limit, adding hundreds of unnecessary pounds.

Member previewVariant 4 · 3 implementations · 12 checks per implementation

Case contract

Input [W lb, CG, fwd limit, aft limit, ballast arm, max weight]. Inside inclusive limits -> 0. Otherwise ballast B brings CG to the violated limit: B = W*(CG-limit)/(limit-arm), rounded up to whole lb; ballast arm not on the corrective side of that limit -> 'ERR_BALLAST_ARM'; W+B above max -> 'ERR_OVERWEIGHT'.

Why this case matters

Ballast adds weight at a fixed station; the required amount depends on the distance from the ballast arm to the violated limit, and adds to gross weight.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
aft CG nose ballast	`"ERR_OVERWEIGHT"`	`49`	Failed

MEMBER ARCHIVE

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