For ground starts, the allowed ON time during a start attempt is how many seconds?

For ground starts, the allowed ON time during a start attempt is how many seconds?

• A. 90 seconds
• B. 60 seconds
• C. 30 seconds
• D. 120 seconds

Answer: (A)

During a ground start, the starter and ignition/fuel control are allowed to operate for up to 90 seconds in a single start attempt. This ON time protects the starter and electrical system from overheating and excessive wear. If the engine hasn’t lit off within that window, the start must be aborted and a cooldown observed before attempting again. If light-off occurs within the window, the start proceeds and the engine will controller or auto-disengage the starter as it reaches the required speed. This 90-second limit is specified in the CRJ-550 start procedure, so 90 seconds is the correct limit.

During a ground start, the starter and ignition/fuel control are allowed to operate for up to 90 seconds in a single start attempt. This ON time protects the starter and electrical system from overheating and excessive wear. If the engine hasn’t lit off within that window, the start must be aborted and a cooldown observed before attempting again. If light-off occurs within the window, the start proceeds and the engine will controller or auto-disengage the starter as it reaches the required speed. This 90-second limit is specified in the CRJ-550 start procedure, so 90 seconds is the correct limit.