FA-66167 / Aviation weight and balance / Member archive

Left and right lateral moments added instead of cancelling · case 02

Symmetric left and right loads produce a large lateral CG offset.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

Input {'items':[[lb, longitudinal arm, lateral arm]] (first item basic empty weight; lateral right positive),'long_env':[fwd,aft],'lat_limit':L}. Longitudinal CG must be within inclusive limits; |lateral CG| <= L. Status 'BOTH','LONG','LAT' or 'OK'. Return [long CG r2, signed lateral CG r2, status].

Why this case matters

Helicopters have a lateral CG limit as well as a longitudinal one; lateral arms are signed and all weight, including centerline weight, dilutes the lateral offset.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
heavy left hoist load	`[106.58, 5.18, "LAT"]`	`[106.58, -3.13, "LAT"]`	Failed

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