Flight Controls Flashcards
What is the effect of pushing the Pitch Trim Switches
Push (both switches) –
in the normal mode in flight, changes the trim reference airspeed
in the normal mode on the ground, moves the stabilizer
in the secondary and direct modes, moves the stabilizer.
The primary flight control system provides flight envelope protection when operating in normal mode. They are :-
stall protection
overspeed protection
bank angle protection.
In the Secondary and Direct mode, the following functions are NOT available:
autopilot auto speedbrakes envelope protection gust suppression manual rudder trim cancel switch thrust asymmetry compensation yaw damping May be Inop G-STBA - G-STBL, G-YMMR - G-YMMU tail strike protection
Stall Protection. What does the Amber band represent?
Top of amber band is minimum manoeuvre speed. It’s the lowest speed you can trim to.
Bottom of the Amber band is the stall speed.
The green band is calculated using the FMC inputs of CG, gross weight, and takeoff thrust.
In G-STBA - G-STBL, G-YMMR - G-YMMU it is also calculated using the FMC input of :-
V1
After Pushback, when is the Flight Control Check commenced
once the Ground Crew have given the ‘all clear’ signal.
Only change the flap in a non-normal G/A if
the QRH/ECL instructs you to. Eg
In the HYD ECL it doesn’t say move the flaps therefore you don’t, you stay at F20. Whereas in the engine failure ECL (for example) it says use F20 for approach and F5 for the G/A
According to the Groundschool engineer, Alternate Flaps takes …. extra miles.
10
In the Secondary Flap mode, 0-5 takes ……. mins and
5-20 takes …. min. Therefore initiate Flap 1 with …..no to go.
4 min
1 min
40 nm
5 mins at 210kts is just under 20nm, therefore initiate F1 with 40nm to go. Tell ATC you intentions.
Can Alternate Gear be raised again?
No, therefore tell ATC your intention. Ask for an early Landing clearance with no other Landings or Departures on the Runway by the time you commence your Approach.
How long does Alternate Gear take to extend?
Plan 2 mins/ 6nm before descent from your Platform Altitude if you are not performance limited.
If you are then wait until you are descending.
If you do not have normal brakes, then all other braking systems require…..
Maually braking.
When using Alternate Flaps, Brief that you are now in Control of……
your own Aysmmetry, so check for any unintended rolling
Slats only move when positioned to
1 or 25/30.
With Flaps/Slats Primary, the Flaps/Slats will move automatically in
the Secondary mode.
With Flaps/Slats Control, you will need to move the Flaps/Slats in the
Alternate mode.
With Flaps/Slats Drive, you will …..be able to move the Flaps/Slats from their current position. You are going nowhere if it happens on retraction.
not
During what 3 Checklists will you require Alternate Flaps?
SLATS/FLAPS CONTROL
AIRSPEED UNRELIABLE
Alternate Flap mode is limited to a maximum of Flap
20
In fact the checklist will always require a landing at F20
Can you Autoland with the Flaps in Alternate mode.
Yes if it is only a Slats/Flaps Controls issue. Obviously not if part of the Airspeed Unreliable Checklist.
Can you Autoland with a Flaps/Slaps Primary Fail issue
Yes.
Can you Autoland with Slats/Flaps Drive?
No
What does FLIGHT CONTROL MODE mean?
The flight control system is in the secondary mode.
Amongst other things, Autopilot will be inop and Envelope protection functions are inop
The Flaps and Slats have their own
Independent system.
So a Slats Drive will not affect the Flaps
Aileron trim is…….. when the Autopilot is engaged.
inhibited
The rudder trim control can be used to command manual rudder trim in all three flight control modes. Two rudder trim speeds are available. Low rate rudder trim is commanded by rotating the control to the detent. High rate rudder trim is commanded by rotating the control……. the detent.
Manual Trim Cancel switch actuation causes manually set rudder trim to move to the zero units position at the high speed trim rate.
The zero position achieved by actuating the switch is not as accurate as manually trimming to zero units. The switch has no effect on rudder trim inputs from TAC.
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