Crew index = (410 × 142) / 1000 = 58.22 → but that’s too large.
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. easa atpl question bank
First, convert BEM and crew items into moment index. Crew index = (410 × 142) / 1000 = 58
Given complexity, the : Use loading table with given “index units” where 1 IU = 1000 kg·m. Then BEM moment = 112.4 × 1000 = 112,400 kg·m. Crew moment = 410 × 142 = 58,220 → total moment = 170,620 kg·m → DOI = 170,620 / 1000 = 170.6 — wrong. So not /1000. So not /1000
Therefore, this question uses a . But in the real EASA bank, they predefine that the Dry Operating Index is directly given by loading table or simple addition of mass and index using:
Now crew moment = 410 kg × 142.0 m = 58,220 → Crew Index = 58,220 / 10,000 = 5.822 ≈ 5.8.