POF Q20 - Trimming Flashcards
Comparing the differences between a horizontal trimmable stabiliser and an elevator trim tab, which of these statements are correct or incorrect?
1) More drag is produced by a horizontal trimmable stabiliser.
2) The effective range of the elvator is greater on an elevator with a trim tab.
Select one:
a.1) is incorrect, 2) is incorrect.
b.1) is incorrect, 2) is correct.
c.1) is correct, 2) is incorrect.
d.1) is correct, 2) is correct.
a.1) is incorrect, 2) is incorrect.
Which statement in respect of a trimmable horizontal stabiliser is correct?
Select one:
a.Because take-off speeds do not vary with centre of gravity location, the need for stabiliser adjustment is dependent on flap position only.
b.At the forward CG limit, stabiliser trim is adjusted fully nose down to obtain maximum elevator authority at rotation during take-off.
c.An aeroplane with a forward CG requires the stabiliser leading edge to be lower than for one with an aft CG in the same trimmed condition.
d.An aeroplane with a forward CG requires the stabiliser leading edge to be higher than for one with an aft CG in the same trimmed condition.
c.An aeroplane with a forward CG requires the stabiliser leading edge to be lower than for one with an aft CG in the same trimmed condition.
What is the position of the elevator in relation to the trimmable horizontal stabiliser of an aeroplane with fully hydraulically operated flight controls that is in trim?
Select one:
a.The elevator is always deflected slightly downward in order to have sufficient remaining flare capability.
b.The position depends on speed, the position of flaps and slats and the position of the centre of gravity.
c.Elevator deflection is zero.
d.At a forward CG, the elevator is deflected upward and at an aft CG, it is deflected downward.
c.Elevator deflection is zero.
If the elevator trim tab is deflected up, the cockpit trim indicator shows:
Select one:
a.nose down.
b.nose up.
c.nose left.
d.neutral.
a.nose down.
The most important factor determining the required position of the Trimmable Horizontal Stabiliser (THS) for take-off is the:
Select one
a.centre of gravity position of the fuel.
b.stall speed.
c.total mass of the aeroplane.
d.position of the aeroplane’s centre of gravity.
d.position of the aeroplane’s centre of gravity.
Which statement about a jet transport aircraft is correct during take-off with the CG at the forward limit and the trimmable horizontal stabiliser (THS) positioned at the maximum allowable aircraft nose-down position?
Select one:
a.The rotation will require extra stick force.
b.If the THS position is just within the limits of the green band, the take off warning system will be activated.
c.Rotation will be normal.
d.Early nose wheel raising will take place.
a.The rotation will require extra stick force.
One advantage of a THS system compared with an elevator trim system is that:
Select one
a.the structure weighs less.
b.it leads to greater stability in flight.
c.the systems complexity is reduced.
d.it is a more powerful means of trimming.
d.it is a more powerful means of trimming.
In straight and level flight, as speed is reduced:
Select one
a.the elevator is deflected further upwards and the trim tab further downwards.
b.the elevator and trim tab do not move.
c.both elevator and trim tab are deflected further upwards.
d.the elevator is deflected further downwards and the trim tab further upwards.
a.the elevator is deflected further upwards and the trim tab further downwards.
The reason for having a trim system on power assisted flying controls is to:
Select one
a.relieve stresses on the hydraulic actuators.
b.relieve stresses on the trim tab.
c.enable the stick force to be reduced to zero.
d.enable the pilot to maintain control in case of hydraulic failure.
c.enable the stick force to be reduced to zero.
In the case that the THS becomes jammed, which statement is correct?
a.It is impossible to have any effect over pitch moments of the aircraft
b.This is not an issue as you still have elevator authority
c.The out-of-trim force may be reduced by flying slower
d.The out-of-trim force may be reduced by flying faster
c.The out-of-trim force may be reduced by flying slower
