ATA 27 Flight Controls Flashcards
Are any of the PRIMARY flight controls “fly by wire”?
Nope
System A (or B) flight controls hydraulic package have shutoff valves controlling pressure to which components?
Aileron PCU
Elevator PCU
Main Rudder PCU
Elevator Feel Computer
Where are the aileron PCUs located?
Left Forward bulkhead of the main landing gear wheel well
Aileron trim is operated by _______________________________.
Aileron feel is provided by___________________.
Electric trim actuator. Aileron feel and centering unit.
What are the hydraulic pressure sources that can be used to operate the rudder?
System A and System B, and standby rudder system
Describe operation of the elevator tabs.
When the Trailing edge flaps are up the tabs balance the elevator. As the elevator moves the tabs move in the opposite direction.
List the functions of SMYD one.
.
Controls main rudder PCU during normal operations.
Primary yaw dampening
stick shaker
auto slat
increases elevator feel force during stall.
List the functions of SMYD two
WTRIS
Stall Management Yaw Dampening
Stick shaker
Autoslat
During a stall elevator feel forces increase, what components cause this function.
Input from SMYDS
Elevator feel shift module(EFSM), elevator feel computer and dual feel actuator.
What inputs can cause the stabilizer to trim?
stabilizer trim switches
What are the power sources that can move the TE flaps?
System B hydraulics only and alternate for flaps is the EMDP.
The flap indicator has split needles, what could this mean?
Asymmetry, uncommented motion, or skew condition
Where is TE flap indication provided?
Pilots side MDS
Where are the flap skew sensors located?
There are eight sensors one at each flap drive mechanism.
List the ways that the flap bypass can move to bypass.
TE Flap Asymmetry
TE Flap Skew
TE Flap uncommented motion
Alternate Flap operation
Flight spoilers are numbered________________________________.
Left Wing panels: 2,3,4, and 5
Right Wing panels: 8,9,10,11.
What functions do the flight spoilers provide?
Roll control, and assist with increasing drag and reducing lift on landing and rejected takeoff, as well as helping control aircraft if the elevator is jammed.
How many ground spoiler panels and actuators are there?
4 panels, 6 actuators(2 for both inboard ground spoilers and 1 for both outboard ground spoilers).
What is the pressure source for the ground spoilers?
System A
What component prevents the ground spoilers from deploying in flight?
SCE
What programs movement of the L E devices?
Trailing Edge Flap System
Why does the autoslat valve have two control solenoids?
Redundancy(If one valve fails or SMYD has a failure the pressure still goes to the actuators).
What are the possible hydraulic power sources for leading edge devices?
PTU, Standby and System B
What does the green leading edge flaps extend light mean?
Leading edge flaps are extended/takeoff
Where is the green leading edge flaps extend light located?
P-5 overhead panel
What is the maximum control wheel rotation?
plus or minus 10 units(60 degrees) of control wheel rotation
What does WTRIS do?
Helps to make coordinated turns using the standby hydraulic system
Where is the balance bay?
Sealed inside the wing
Are spoilers considered primary flight controls?
No, they are secondary
What does each transmission have?
A torque brake which prevents excessive loads on the ball-screw if the flap does not move freely.
What does a no-back break on each transmission do?
Makes it so that the motors can run the flaps but the flaps can’t run the motor
What do the needles look like in asymmetry?
9 degrees apart
What do the needles look like in an uncommand motion?
Both needles stop at the uncommand position
What do the needles look like in a skew position?
The needles will split approximately 15 degrees and stop.
What are the resolver difference limits?
28 degrees between skew sensor 1 and 8
28 degrees between skew sensors 2 and 7
26 degrees between skew sensors 3 and 8
34 degrees between skew sensors 4 and 5
What does the Amber light on spoilers mean?
Tells pilots to land without spoilers
Which flight spoilers can you not MEL?
5 and 8
When does the autoslat operate?
Flap lever at 1,2,5,10,15, or 25
The airplane gets near a stall condition
Alternative operation is not active
Where do autoslat commands come from?
Two units of SMYD.
