Flying b737 through inversion layer
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Flying b737 through inversion layer
Flying B737 through inversion layer at high altitudes the thrust deteriorates and thrust levers come back and airplane loses substantial amount of altitude. What does boeing recommends about handling this situation any pointers from seasoned B737 pilots.
Join Date: Jan 2002
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Hi
Just interested why the thrust levers would come back?
As the air temp increases its density decreases therefore to maintain the required thrust, they would have to be advanced which is what the auto throttle(slowly) or you would do in crz and if required you can select cont on the N1 page to increase the carrots.
If in climb well as the temp increases local speed of sound increases so if climbing at a mach no in say the level change, the nose would lower to reduce the rate of climb to achieve the commanded speed. It may level off to do this or indeed descend slightly but not by a substantial amount. If you end up losing a substantial amount of altitude your flying way too close to the aircraft limits for you weight and should reconsider your performance calculations.
kempus
oh and if your losing alt the chances are the auto pilot will try and maintain that alt and could stall the aircraft. High alt stall same as any other stall, lower the nose, decrease the angle of attack, unload the wings however, with the 737's engines in front of the c of g adding thrust will cause the nose to pitch up which can cause a secondary stall. With a stall at high atltitudes ground contact is not really a consideration (take into account geographic area) so use the height to regain the airspeed by descending.
Just interested why the thrust levers would come back?
As the air temp increases its density decreases therefore to maintain the required thrust, they would have to be advanced which is what the auto throttle(slowly) or you would do in crz and if required you can select cont on the N1 page to increase the carrots.
If in climb well as the temp increases local speed of sound increases so if climbing at a mach no in say the level change, the nose would lower to reduce the rate of climb to achieve the commanded speed. It may level off to do this or indeed descend slightly but not by a substantial amount. If you end up losing a substantial amount of altitude your flying way too close to the aircraft limits for you weight and should reconsider your performance calculations.
kempus
oh and if your losing alt the chances are the auto pilot will try and maintain that alt and could stall the aircraft. High alt stall same as any other stall, lower the nose, decrease the angle of attack, unload the wings however, with the 737's engines in front of the c of g adding thrust will cause the nose to pitch up which can cause a secondary stall. With a stall at high atltitudes ground contact is not really a consideration (take into account geographic area) so use the height to regain the airspeed by descending.
Last edited by Kempus; 6th Jul 2010 at 17:33. Reason: spelling and stuff
