Discussion
An aircraft has \( T/W = 0.28 \) at a design weight of \( 900 \) kN, with three engines. The thrust per engine is
Answer: B
Correct answer: 84 kN
Find the total installed thrust first, then divide among the engines:
\[ T_{total} = 900 \times 0.28 = 252\ \mathrm{kN} \]
\[ T_{engine} = \frac{252}{3} = 84\ \mathrm{kN} \]
The distractor \( 252 \) is the total rather than the per-engine figure. The per-engine number is what matters for engine selection, since it must be matched against actual catalogue ratings - and the availability of a suitable engine often forces the design point to move slightly from where the diagram alone would put it.
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