Chapter 9 - Flight Control Flashcards
If the EICAS message “FLAPS PRIMARY” is displayed, what protection is provided?
• Asymmetry protection is provided
• Load relief is not provided
With the loss of Hydraulic System 4, why does the QRH procedure require manual deployment of the ground spoilers?
• With the loss of System 4, the inboard two spoilers on each wing are unpowered. Raising the remaining spoilers creates a nose up moment, and
• The right outboard elevator is unpowered, reducing pitch authority.
Why does the QRH procedures for the loss of Hydraulic Systems 1 and 4 and loss of Hydraulic Systems 2 and 3 call for an approach speed of Vref30 + 20 knots?
Loss of pitch authority, requiring extra speed for the flare
What operational factors would you consider when conducting an approach with Hydraulic System 1 unpowered
• The inboard flaps will move in secondary mode
• The landing gear will be extended using the alternate system
• Extra time must be planned to configure for the approach
The Alternate Flaps arming switch is pressed on and ALTN is annunciated in the switch, to what flap setting can you move the flap handle?
The flap handle does not have any effect when using the Alternate Flap System.
Using the alternate flap system, how do you select flaps 1?
You cannot select flaps 1 using the alternate flap system
Will the aileron trim function work with the autopilot engaged? Is this permitted?
• Aileron trim will function, but it is not apparent with the autopilot engaged.
• This is not permitted
What will occur if the control wheel trim switches are activated with an autopilot engaged? Are they ever inhibited?
• The autopilot will disconnect if any control wheel trim switch is actuated, except;
• The trim switches are inhibited during a coupled ILS approach
Hydraulic System 4 is inoperative. What performance penalty must be applied? How?
• HYDRAULIC PRESSURE SYS 4 must be selected from the ACARS Landing Conditions Non-Normal menu, or;
• A live calculation must be run by Flight Following and the data transmittedto the crew via ACARS or Satphone.
You may have noticed that the line and number on the flap indicator turn magenta when the PF selects reverse thrust. Why does this happen?
During reverse thrust operation, automatic retraction of inboard and midspan leading edge flaps changes the flap position indicator to reflect flaps in transit.
What can you do if you lose elevator control due to a jam?
When significant manual force is applied to the control column, shear outs between the inboard and outboard elevators allow elevator control to be regained
Describe the elevator feel system.
Mechanism provides artificial feel at control columns.
Force increases as airspeed increases
If both hydraulic systems 2 and 3 fail, mechanical springs provide feel force. Feel force is no longer a function of airspeed.
How does the aileron lockout system work, and what is its purpose?
How it works: Locks the outboard ailerons in the neutral position at high airspeeds.
Purpose: Permits full travel of the outboard ailerons at low airspeeds, and
Prevents over‐controlling at high airspeeds, and
Provides the required roll authority at low airspeeds.
How do the rudder ratio changers work?
Rudder ratio changers gradually reduce each rudder surface’s response to pedal inputs as airspeed increases.
The system protects the vertical tail from stresses caused by large rudder surface deflections at high airspeeds.
What happens when you select Alternate (ALTN) Flaps Arm Switch?
- arms flap alternate control mode
- arms Alternate Flaps selector
- shuts off primary and secondary mode operation
- asymmetry protection not available
- flap lever inoperative
