PPRuNe Forums - View Single Post - The best video ever on unusal attitude recoveries in airline aircraft
Old 15th Sep 2019, 16:05
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A37575
 
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1. His procedure to get out of nose high would probably get me a fail in the sim. He talks about turning the aircraft to up to 70 degrees and to not just lower the nose. Why, because the passengers would be uncomfortable with the negative Gs! Does anyone here fly for an airline that adopts such a procedure other than the situation that elevator control is not available?
His quip about passengers and negative 'G' was just that - a witty remark.
Warren Vandenburgh's advice to get the nose to drop if faced with an extreme nose high situation by initiating a bank angle up to 70 degrees (depending on how high the nose was to start with) to the nearest horizon, concurs with the current advice in the Boeing 737 series FCTM except Boeing limit the bank angle to 60 degrees.


Edited for brevity: Quote: "If normal pitch control inputs do not stop an increasing pitch rate, rolling the airplane to a bank angle that starts the nose down should work. Bank angles of about 45 degrees up to a maximum of 60 degrees could be needed. Unloading the wing by maintaining continuous nose-down elevator pressure keeps the wing angle of attack as low as possible, making the normal roll controls as effective as possible....the rolling maneuver changes the pitch rate into a turning maneuver, allowing the pitch to decrease...

Finally, if normal pitch control then roll control is ineffective, careful rudder input in the direction of the desired roll may be required to induce a rolling maneuver for recovery... only a small amount of rudder is needed...too much rudder applied too quickly or held too long may result in loss of lateral and directional control.

Because of the low energy condition, pilots should exercise caution when applying rudder. The reduced pitch attitude allows airspeed to increase, thereby improving elevator and aileron effectiveness. After the pitch attitude and airspeed return to a desired range the pilot can reduce angle of bank with normal lateral flight controls and return the air[plane to normal flight." Unquote.

Seems to me that Vandenburgh's and Boeing's recommendations re recovery technique from a nose high unusual attitude, are indeed in broad agreement.

If as you say, that his (Vandenburgh) procedure to get out of nose high would probably get you a fail in the sim, I would suggest that your instructor is in need for some dual instruction on unusual attitude recoveries himself, before being let loose on future students..

Last edited by A37575; 15th Sep 2019 at 16:17.
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