Which start limit applies to Engine Start 3-5 during flight?

Which start limit applies to Engine Start 3-5 during flight?

• A. 120 sec ON / 5 min OFF
• B. 90 sec ON / 10 sec OFF
• C. 120 sec ON / 10 sec OFF
• D. 90 sec ON / 5 min OFF

Answer: (A)

Start limits govern how long the starter can be energized during an engine start and how long you must wait between attempts. This protects the starter, the engine, and the electrical system from overheating or overloading. For Engine Start 3-5 in flight, the approved cycle is two minutes of continuous cranking (ON) followed by a five-minute cooldown (OFF) before another start attempt. This duration gives enough time to attempt a reliable light-off while ensuring the starter and engine have adequate time to cool, preventing damage from overheating and reducing the risk of an electrical overload mid-flight. The other options would either shorten the cranking time too much, risking an unsuccessful start, or shorten the cooldown or impose an inappropriate cooldown, which could lead to overheating or overload.

Start limits govern how long the starter can be energized during an engine start and how long you must wait between attempts. This protects the starter, the engine, and the electrical system from overheating or overloading.

For Engine Start 3-5 in flight, the approved cycle is two minutes of continuous cranking (ON) followed by a five-minute cooldown (OFF) before another start attempt. This duration gives enough time to attempt a reliable light-off while ensuring the starter and engine have adequate time to cool, preventing damage from overheating and reducing the risk of an electrical overload mid-flight.

The other options would either shorten the cranking time too much, risking an unsuccessful start, or shorten the cooldown or impose an inappropriate cooldown, which could lead to overheating or overload.