Given BEM index = 112.4 at 34,560 kg. Crew: Mass 410 kg, arm 142.0. To add index, use: Added Index = (Mass × Arm) / (Reference constant) ? Wait — in EASA questions, often the index is a simple moment / 1000 or moment / 100,000 . We must deduce the Index Unit (IU).
First, convert BEM and crew items into moment index. easa atpl question bank
From BEM: Index 112.4 at 34,560 kg implies: Index = (Mass × Arm) / 1000? Let’s check: (34,560 × Arm_BEM)/1000 = 112.4 → Arm_BEM = (112.4 × 1000) / 34,560 ≈ 3.25 — impossible (too small). So not /1000. Given BEM index = 112