Question about motor starts.

[Laser9]

When doing a motor start in the A-10, at what point should fuel be introduced? Is there a specific N2 speed? 

Thanks

[jaylw314]

The normal automatic start sequence starts fuel flow once the engine starts rotating, so I suspect the answer is no.

[Kippy]

An engine being motored by the APU should reach 26% to 28% core RPM. Ensure you meet that spec before placing the throttle to idle.

After placing the throttle to idle, fuel is provided after the engine starts to rotate.

Edited June 14, 2022 by Kippy

[Laser9]

1 hour ago, jaylw314 said:

The normal automatic start sequence starts fuel flow once the engine starts rotating, so I suspect the answer is no.

roger, thx

[ASAP]

10 hours ago, Laser9 said:

When doing a motor start in the A-10, at what point should fuel be introduced? Is there a specific N2 speed? 

Thanks

The APU should get the core RPM above 24%, the reason you motor the engine though isn’t about getting the core RPM up it’s about getting the ITT down below 150 so you don’t get a hot start. The automatic start should take over from there

[Laser9]

7 hours ago, ASAP said:

The APU should get the core RPM above 24%, the reason you motor the engine though isn’t about getting the core RPM up it’s about getting the ITT down below 150 so you don’t get a hot start. The automatic start should take over from there

That makes sense. Thank you