Flight Controls

Question 1

How are flight controls powered

Answer 1

1 PMGs
2 Tranfer Bus -> TRU -> Main DC
3 Hot battery bus
4 RAT

Question 2

3 Flight Control Modes

Answer 2

1 Normal
2 Secondary
3 Direct

Question 3

Normal Flight Control Mode
Input signal
Pith, roll, yaw

Answer 3

Pilot -> ACE -> PFC -> ACE -> PCU

Pitch - elevator feel is variable based on trim reference speed
Roll - spoilers 5 & 10 are locked out at high speeds. 4 & 11 are mechanical
Yaw - rudder ratio controls rudder movement based on speed

Question 4

Secondary flight control mode

Answer 4

Loss of inertial or speed reference

P - lose pitch compensation and trim moves stabilizer
R - similar to normal but 5 & 10 are always locked out
Y - rudder ratio based on flap position. Flaps up = less rudder response

Question 5

Direct flight controls

Answer 5

Loss of other reference or by switching PFC to disconnect

P - lose pitch compensation and trim moves stabilizer
R - similar to normal but 5 & 10 are always locked out
Y - rudder ratio based on flap position. Flaps up = less rudder response

Question 6

Flap modes of operation

Answer 6

1 Primary
2 secondary
3 alternate

Question 7

Flight Control Modes
Protections

Answer 7

Normal
Secondary
Direct

SOB TAG RATY W

S - stall protection
O- overspeed protection
B - bank angle protection

T - tac
A - auto pilot
G - gust protection

R - rudder cancel
A - auto speed brakes
T - tail strike protection
Y - yaw dampening

W - wheel crosstie

available in secondary

Question 8

Autoslat System

Answer 8

If slats are mid-range when approaching stall they extend to full down

Only works in primary mode

Question 9

RAT (flight controls)

Answer 9

Only flight controls on the CENTER HYDRAULIC system at (1500) half system psi

Prioritizes hydraulic over elec

Question 10

RAT deploys if

Answer 10

• Hydraulic- All three pressure low
• Electrical - both A/C Xperia buses unpowered
• Engines - Both fail

Or

• Deployed manually