FA-65998 / Aviation weight and balance / Member archive

Forward-CG ballast placed in the nose yields negative ballast · case 03

A forward-CG aircraft with a nose ballast station gets a negative ballast weight instead of an error.

Member previewVariant 3 · 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
forward case ballast in nose	`-158`	`"ERR_BALLAST_ARM"`	Failed

MEMBER ARCHIVE

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