Flight Controls System

Question 1

If the EICAS message “FLAPS PRIMARY” is displayed, what protection is provided?
(AOM Vol II, Ch 9)

Answer 1

• Asymmetry protection is provided.

* Load relief is not provided.

Question 2

With the loss of Hydraulic System 4, why does the QRH procedure require manual deployment of the ground spoilers? (QRH, Ch 13) (AOM Vol II, Ch 9)

Answer 2

• 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.

Question 3

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?
(QRH, Ch 13) (AOM Vol II, Ch 9)

Answer 3

• Loss of pitch authority, requiring extra speed for the flare.

Question 4

What operational factors would you consider when conducting an approach with Hydraulic System 1 unpowered.
(QRH, Ch 13) (AOM Vol II, Ch 9)

Answer 4

• 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.

Question 5

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?
(AOM Vol II, Ch 9)

Answer 5

• The flap handle does not have any effect when using the Alternate Flap System.

Question 6

Using the alternate flap system, how do you select flaps 1? (AOM Vol II, Ch 9)

Answer 6

• You cannot select flaps 1 using the alternate flap system.

Question 7

Will the aileron trim function with and autopilot engaged? Is this permitted?
(AOM Vol II, Ch 9)

Answer 7

• Aileron trim will function, but it is not apparent with the autopilot engaged.
• This is not permitted.

Question 8

What will occur if the control wheel trim switches are activated with an autopilot engaged? Are they ever inhibited? (AOM Vol II, Ch 9)

Answer 8

• The autopilot will disconnect if any control wheel trim switch is actuated, except;
• The trim switches are inhibited during a coupled ILS approach.

Question 9

Hydraulic System 4 is inoperative. What performance penalty must be applied? How?
(QRH, Ch 13)

Answer 9

• 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 transmitted to the crew via ACARS or Satphone.

Question 10

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?
(AOM Vol II, Ch 9)

Answer 10

• During reverse thrust operation, automatic retraction of inboard and midspan leading edge flaps changes the flap position indicator to reflect flaps in transit.