Wanted to do some SE out procedures and I couldn't find any info in all the manuals on Air Starts...I understand that loading the engine up from the prop is bad for the gearbox, but are there no published procedures for an air restart incase of engine loss with no damage?JB

Wanted to do some SE out procedures and I couldn't find any info in all the manuals on Air Starts...I understand that loading the engine up from the prop is bad for the gearbox, but are there no published procedures for an air restart incase of engine loss with no damage?JB

I know there are Devs around answering other questions, why is it that they can't answer this one?Jeff B

Some devs are better at answering certain questions than others...Let not your heart be troubled... we'll try to help you out (but I can't I'm afraid)

Hi,I think to do an air start, you:* Switch on the standby fuel pump* Ensure the throttle is at idle, and that the condition lever is in FLIGHT* Press the starterAs part of the start, the prop will unfeather ITSELF. Do **NOT** unfeather the prop manually in flight - the aircraft will be uncontrollable!The manual doesn't say much on this at all.Best regards,Robin.

I know there are Devs around answering other questions, why is it that they can't answer this one?Jeff B

During testing, I performed several successful air starts by setting the power lever to flight idle, moving the condition levers from feather to taxi, and letting the prop start to windmill. Leave the start knob in AIR, turn on the standby fuel pump, turn the ignition knob to ENERGISE, and push the appropriate START button. I don't know off the top of my head what the target RPM is, but at some point, you move the ignition knob to IGNITE. Push the ENRICH button, and monitor the start. At 60%, move the ignition knob to the 60% position, ensure EGT is within limits and that rpm comes up to either the USG (72%) or PG LOW (96%), I don't remember which way it is in the sim. Move the ignition switch to NORM (I think it's NORM), and away you go.Regards,NickEDIT: Maybe Robin is right, and the airplane will do an automatic IEC controlled air start. I never tried it that way, and I don't recall seeing a procedure for an airstart in the manual anywhere. The only reason I ever failed an engine was to test the APR and NTS systems.

EDIT: Cross editing!The procedure you describe sounds like a manual start??If it feathered in flight it will not unfeather unless you run the pump. Doing so with a dead engine can produce so much drag from the engine that it becomes uncontrollable.Let me go and try it... :DBest regards,Robin.

During testing, I performed several successful air starts by setting the power lever to flight idle, moving the condition levers from feather to taxi, and letting the prop start to windmill. Leave the start knob in AIR, turn on the standby fuel pump, turn the ignition knob to ENERGISE, and push the appropriate START button. I don't know off the top of my head what the target RPM is, but at some point, you move the ignition knob to IGNITE. Push the ENRICH button, and monitor the start. At 60%, move the ignition knob to the 60% position, ensure EGT is within limits and that rpm comes up to either the USG (72%) or PG LOW (96%), I don't remember which way it is in the sim. Move the ignition switch to NORM (I think it's NORM), and away you go.Regards,NickEDIT: Maybe Robin is right, and the airplane will do an automatic IEC controlled air start. I never tried it that way, and I don't recall seeing a procedure for an airstart in the manual anywhere. The only reason I ever failed an engine was to test the APR and NTS systems.

Thank you very much... I appreciate all the repliesI thought that a windmilling prop on a dead geared TP would rip the gearbox apart. JB

Thank you very much... I appreciate all the repliesI thought that a windmilling prop on a dead geared TP would rip the gearbox apart. JB

If I'm not mistaken, the NTS system does a lot of stuff with blade angle in order to attain the proper torque load on the prop for an airstart. "PFM" if you ask me.Regards,Nick

EDIT: Cross editing!The procedure you describe sounds like a manual start??If it feathered in flight it will not unfeather unless you run the pump. Doing so with a dead engine can produce so much drag from the engine that it becomes uncontrollable.Let me go and try it... :DBest regards,Robin.

Robin, the unfeathering pump is controlled automatically by the IEC when the START MASTER knob is in AIR. I don't think it fully unfeathers the props out to flat pitch, but it does control blade angle in order to achieve the proper torque load on the prop to reduce backlash on the ring gear. At least, that's how I understand it.Regards,Nick

Hi,I tried the following:* AIR* NORMAL* ENRICH* START - She wouldn't turn (same symptoms as if not in the start locks).* AIR* ENERGIZE* START* At 15% RPM, ENRICH ON, IGNITION* Passing 50% RPM, set 60%* Let engine stabilize, then NORMAL* CONDITION LEVER to FLIGHT* Increase throttleI did this at 170 kts.Unbelievably, I didn't toast the engine once, despite a few unsuccessful starts. I also managed several successful in-flight shutdowns/re-lights on the same engine. Amazing!!! :DBest regards,Robin.

I know there are Devs around answering other questions, why is it that they can't answer this one?Jeff B

Please remember too this is a major vacation weekend in the US and many of us (myself included) are checking in on the forum when we can from hotel rooms etc..

Please remember too this is a major vacation weekend in the US and many of us (myself included) are checking in on the forum when we can from hotel rooms etc..

Thanks for all the replies. Both an auto start and a manual air start seems to work, although the manual start seems to relight it everytime, while the autostart sometimes fails...Thanks again.Now, maybe I can get the question about the mentioned failure module in a bit.Have a good eve everyone..JB