FA-66283 / Aviation weight and balance / Member archive

Derate applied only per completed thousand feet · case 03

A density altitude of 4990 ft gets the same reduction as 4000 ft.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Input {'elev_ft','altimeter' inHg,'oat_c','mtow'}. Pressure altitude = elev + (29.92 - altimeter)*1000; ISA temp = 15 - 2 per 1000 ft of PA; DA = PA + 120*(OAT - ISA). Allowed weight = MTOW - 20 lb per 1000 ft (pro rata) of DA above 3000 ft, rounded DOWN to 10 lb. Return [DA rounded, allowed].

Why this case matters

A stipulated density-altitude weight derate: the reduction must use pressure altitude, the ISA temperature at that altitude, and conservative rounding.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
hot high field	`[8124, 2450]`	`[8124, 2440]`	Failed

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