Airstart (Windmill) from Flight Level 250 to Sea Level requires a minimum airspeed and N2: ?

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Prepare for the GoJet Airlines CRJ-550 Test. Use flashcards, multiple choice questions, and detailed explanations to ace your exam!

Multiple Choice

Airstart (Windmill) from Flight Level 250 to Sea Level requires a minimum airspeed and N2: ?

Explanation:
A windmill (air) start relies on ram air to spin the engine core. From FL250 the air is thin, so you need enough airflow to drive the compressor to a point where the start can proceed. The engine must reach a minimum N2—about 7.2%—before the start sequence can advance and fuel control can be considered for light-off. Keeping the descent and engine start within the aircraft’s speed limits, specifically not exceeding Vmo, ensures the airspeed provides sufficient ram air without overdoing the structural limits. Therefore, the required minimums are around 250 knots of airspeed and a minimum N2 of 7.2%.

A windmill (air) start relies on ram air to spin the engine core. From FL250 the air is thin, so you need enough airflow to drive the compressor to a point where the start can proceed. The engine must reach a minimum N2—about 7.2%—before the start sequence can advance and fuel control can be considered for light-off. Keeping the descent and engine start within the aircraft’s speed limits, specifically not exceeding Vmo, ensures the airspeed provides sufficient ram air without overdoing the structural limits. Therefore, the required minimums are around 250 knots of airspeed and a minimum N2 of 7.2%.

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