FA-66157 / Aviation weight and balance / Member archive

%MAC rounded to a whole percent before lookup · case 02

Trim jumps in steps and differs by up to half a percent of MAC worth of trim.

Member previewVariant 2 · 3 implementations · 12 checks per implementation

Case contract

Input {'pmac','flaps','tables':{flap string:[[%MAC, trim units] ascending]}}. Missing flap table -> 'ERR_FLAPS'; %MAC outside the table's inclusive range -> 'ERR_RANGE' (no extrapolation or clamping); otherwise linear interpolation between bracketing nodes, rounded to 0.1 unit.

Why this case matters

Takeoff stabilizer trim is read from a flap-specific table indexed by %MAC; out-of-table values must not be silently clamped.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
flaps 15 between nodes	`3.6`	`3.7`	Failed

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