FA-66094 / Aviation weight and balance / Member archive

Millimetre arms converted as centimetres · case 04

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

Member previewVariant 4 · 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, 5015.08, 1516.54]`	`[3306.9, 501.51, 151.65]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.