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JS41 - Hot Start Recovery

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After a failed hot engine start where the EGT is stuck up around 600 or 700 degrees, is there a method by which you can cool the engine back down below 200 degree for another start attempt? Without having to reload the aircraft in the sim?IIRC, on another complex aircraft, you could turn the turbine without ignition and it would force cool air through it. Is there anything like this for the JS41?

Regards,
Al Jordan | KCAE

Al,On the overhead turn the start master switch to whichever engine you want to cool down, turn the manual start switch to energise, and press the start button. The engine will crank, but you won't get ignition.

Change the manual start knob to energize and start the engines then, your EGT will drop fast as the engine will not ignite ;)[Edit] - To slow today lol, nice reply Chaos

  • Author

Thanks Mike & Carlos,Just the straight-forward answer I was looking for. Thanks! :(

Regards,
Al Jordan | KCAE

Glad to help.

[Edit] - To slow today lol, nice reply Chaos
Only fair Carlos, you beat me to the punch the other day. :(
Glad to help.Only fair Carlos, you beat me to the punch the other day. :(
Glad to help to,Lol you're right I had forgotten that :(
  • Author

OK, then a follow up - does this work after you get the flames out with a fire-bottle? Can you try to resume a startup (pretending the virtual ground crew have already replaced the parts you fried)? Does resetting failures in the FSX menu have any affect on this recovery?

Regards,
Al Jordan | KCAE

OK, then a follow up - does this work after you get the flames out with a fire-bottle? Can you try to resume a startup (pretending the virtual ground crew have already replaced the parts you fried)?
Best thing you could do after you fried an engine is to reset failures, got to the engines tab on FSX failures menu and reset failures there, then let the EGT drop beloow 200 degrees and resume start up procedures ;)
  • Author
Best thing you could do after you fried an engine is to reset failures, got to the engines tab on FSX failures menu and reset failures there, then let the EGT drop beloow 200 degrees and resume start up procedures ;)
Cool, thanks Carlos. Now you back to being one-up on Mike :(

Regards,
Al Jordan | KCAE

Would this technique be known as a 'ventilation run?' I believe it is.Aircraft Operating Manual, Page 23:"C. Ventilation Run 1. Must not 15 seconds or 15% RPM"I was trying to figure out what this meant. Has anybody tried running it for longer than the posted limit to see if it causes any damage (in the simulator)?

Would this technique be known as a 'ventilation run?' I believe it is.Aircraft Operating Manual, Page 23:"C. Ventilation Run 1. Must not 15 seconds or 15% RPM"I was trying to figure out what this meant. Has anybody tried running it for longer than the posted limit to see if it causes any damage (in the simulator)?
I don't know about doing this in the simulator. But in the real aircraft, this is done because the starter generator for the engine can easily overheat. For example, the starter generator on a PT6 using EXTERNAL POWER was limited to the following:20 Seconds ON2 Minutes OFF20 Seconds ON2 Minutes OFF20 Seconds ON60 Minutes OFFThese motors heat up quite a lot when turning over the engine. Even a free turbine like the PT6 is known to draw over 1000 AMPS at the initial spike when it is first engaged. This of course drops rapidly as the engine begins to turn.I've seen the large 1 inch thick electrical leads on the Power Cart Literally JUMP apart when the current is applied. Its pretty amazing.
I've seen the large 1 inch thick electrical leads on the Power Cart Literally JUMP apart when the current is applied. Its pretty amazing.
+1Seen that many times as well. Quite a sight to see.

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