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Old 18th February 2013 | 19:50
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westhawk
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Joined: Jun 2005
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From: USA
Along those lines, does anybody have uncommanded reverser deployment as an emergency memory item? If so, what airplane is it?
Sure CA, the airplane is the IAI Westwind and the memory items follow:

Taken from the IAI 1124/1124A SimuFlite QRH: (from memory since I don't have the QRH handy at the moment)

Uncommanded T/R deployment in flight:

Take immediate command of the flight controls
Ensure affected engine thrust lever is in the idle position.
It should be noted that the T/R sub lever should be checked to ensure it's in the STOWED position too.

When a T/R deploys in (simulated) flight, significant yaw, roll and pitching moments will occur. Aggressive nose down elevator input will be required to overcome the nose up pitching moment created by a deployed reverser. Plenty of rudder will be required to counter the yaw and timely yet gentle use of ailerons will counter the rolling moments. Overcontrolling is the common pilot response in this situation so the value of previous exposure is notable. Really it's just like an engine failure only much more so!

The checklist for uncommanded T/R in flight deployment continues and calls for the following actions. (again paraphrased from memory)

Establish an airspeed at or below 150 KIAS.
Disengage the affected T/R power CB (leave the T/R indication CBs engaged)
If these actions are unsuccessful in stowing T/R, shutdown the affected engine and land at the nearest suitable airport

The normal initial and recurrent S/F sim scenarios involved a T/R deployment prior to V1 and another after liftoff at around V2+10. The reject prior to V1 was easy if you reacted quickly but the other could be a challenge, especially with a good sim instructor who knows how to make it a true surprise. At mid level training weight near SL, the sim would even climb 500 fpm or better. Don't ask about Aspen! One sim instructor popped a T/R on us while doing 300 plus on A/P. That checked off the "unusual attitude recovery" box nicely. I'm happy to report that I've never had this happen in the real airplane, but found the sim training to be enlightening.

Last edited by westhawk; 18th February 2013 at 19:54.
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