FA-66095 / Aviation weight and balance / Member archive

Millimetre arms converted as centimetres · case 05

Items documented in millimetres land ten times further aft than their real station.

Member previewVariant 5 · 3 implementations · 10 checks per implementation

Case contract

Input [[quantity, 'kg'|'lb', arm, 'in'|'cm'|'mm']]. Convert to lb (1 kg = 2.20462 lb) and inches (2.54 cm, 25.4 mm per inch); other units -> 'ERR_UNIT'; total weight <= 0 -> 'ERR_WEIGHT'. Return [weight lb r1, reduced moment (lb-in/1000) r2, CG in r2 computed from the unreduced moment].

Why this case matters

Imported aircraft documentation mixes metric and imperial units; reduced moments (moment/1000) are a charting convenience and must not feed the CG division.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
millimetre arms	`[3306.9, 5025.49, 1519.69]`	`[3306.9, 502.55, 151.97]`	Failed

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