Easa: Atpl Question Bank

First, convert BEM and crew items into moment index.

Total DOI = BEM index + Crew Index = 112.4 + 5.8 = ? That doesn’t match any option — contradiction. easa atpl question bank

Wait — option a says DOI = 114.8 → difference = 2.4. That means Crew index = 2.4. Then 2.4 = (410 × 142) / CF → CF = (410 × 142) / 2.4 ≈ 24,258. So CF = 24,258. Then BEM index = (34,560 × arm_BEM) / 24,258 = 112.4 → arm_BEM = (112.4 × 24,258) / 34,560 ≈ 78.9 m — plausible. First, convert BEM and crew items into moment index

a) 34,970 kg / 114.8 b) 34,970 kg / 115.2 c) 35,130 kg / 114.8 d) 35,130 kg / 115.2 Explanation: Step 1 – Calculate Dry Operating Mass (DOM) DOM = BEM + Crew & Crew Baggage + (other fixed operational items if any – here none except crew) DOM = 34,560 kg + 410 kg = 34,970 kg Wait — option a says DOI = 114

Actually: only if index units are moment/constant and the constant is the same. Let’s test option a: DOI 114.8.

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.