Do commercial pilots normally set elevator trim to a nose up condition before take off?

Answer 1

Listen to the Flight Engineers they know. Take off trim is set according to the center of gravity. If the CG is on or near the forward edge of the mean aerodynamic chord or LEMAC, then you would want a nose high trim setting. If the CG is closer to TEMAC (trailing edge mean aerodynamic chord) then you might want a nose low trim tab setting for take off. It all depends on where your CG is at within your Mean Aerodynamic chord

Answer 2

Usually the stabilizer is set to a 'greenband' setting based on weight and the CG (center of gravity) of the airplane. The FMC or flight management computer will compute the stab trim setting and the pilot will set it to this before takeoff. If the pilot is out of the 'greenband' setting, a takeoff warning horn will be heard alerting the flight crew.

There is another mechanism too that help make sure the elevators are in a more nose up position for takeoff called a mach trim actuator. The mach trim actuator also moves the elevator as the airplane burns fuel in flight and keeps the nose up at higher speeds.

Answer 3

The trim setting for take-off on the aircraft I operate is actually nose down of neutral. But most aircraft use a slight nose up trim setting. Quite dependant on the balance of the aircraft, as pointed out by many responses to the question......

Answer 4

Tequila is essentially correct. Pdkflyguy is dead wrong. Takeoff trim setting has NOTHING to do with atmospheric conditions. The only thing effecting it is CG location. To expand a little, trim is not ALWAYS set to a nose up condition, there are times when it will be set neutral or even nose down, again , all depending on the aircraft's CG.

Answer 5

The trim is neutral. Thats the point of trim.

You wouldnt want to trim it up or the aircraft may lift off prematurely and stall after it leaves ground effect.

Answer 6

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Answer 7

yah, the trim starts from zero so everything is nose up by convention. typical trim setting is around 3 units for a light weights to around 6 for heavy weights.

Answer 8

Yes, they have a trim setting that they enter based on the aircraft gross weight, wind conditions, temperature, etc. This is usually determined by the dispatcher, and the pilots enter it prior to takeoff.

Answer 9

Tequila is definitely correct. As a mechanic, knowing how all the systems should work, what he described is pretty much out of the maintenance manual as well. That is how a CRJ operates, as I would imagine any airliner with modern avionics.

Answer 10

Yes they have to to get airborn,