flight controls

Primary mode positions leading edge flaps

Pneumatically — In normal primary flap operation, the FCUs command the leading-edge flaps through the pneumatic system. The FCOM wording is: “positions leading edge flaps pneumatically.” [Ref: FCOM 9.10.8 / 9.20.12]

Primary mode position for trailing edge flaps is

Hydraulically — In primary mode the trailing-edge flaps use hydraulic power. The FCOM states that primary mode “positions … trailing edge flaps hydraulically.” [Ref: FCOM 9.10.8 / 9.20.12]

Secondary mode position for leading and/or trailing edge flaps is

Electrically — Secondary mode is the electrical backup drive for either leading- or trailing-edge flaps if normal pneumatic/hydraulic drive fails. The FCOM says it “positions leading and/or trailing edge flaps electrically.” [Ref: FCOM 9.10.8]

The primary flight controls are powered hydraulically with no manual reversion available. True or False?

True [Ref: FCOM 9.20.1]

An elevator feel and centering mechanism is powered by hydraulic power from which systems?

Hydraulic systems 2 and 3; loss of one system does not affect feel forces. — The system description identifies the relevant source/actuation: “747 Flight Crew Operations Manual Preface - V1V2 List of Effective Pages * = Revised, Added, or Deleted Boeing Proprietary.” That is why the correct source is Hydraulic systems 2 and 3; loss of one system does not affect feel forces.. [Ref: FCOM 9.20.2]

The four inboard spoilers function as ____ in flight.

Speedbrakes [Ref: FCOM 9.20.1]

The ____ spoiler panels on each wing act as ground spoilers upon landing.

6 [Ref: FCOM 9.20.11]

What is the stabilizer trim rate when the EICAS advisory message STAB TRIM 2 is displayed?

Half the normal schedule rate [Ref: FCOM 9.20.5]

When will the ground spoilers extend automatically after landing, with the speedbrake lever in the DN position?

Main gear on ground; thrust levers 1 and 3 near idle; reverse thrust lever 2 OR 4 pulled up to idle detent. — The condition/timing specified by the card is: Main gear on ground; thrust levers 1 and 3 near idle; reverse thrust lever 2 OR 4 pulled up to idle detent.. [Ref: FCOM 9.20.11]

You are flying with flaps 20 at the corresponding FLAP LIMIT placard speed. What happens if you select flaps 25?

Flap relief + EICAS message [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

During normal flap extension sequence, when do inboard and midspan leading edge flaps extend?

When the flap lever is moved from UP detent to FLAPS 1 detent — The condition/timing specified by the card is: When the flap lever is moved from UP detent to FLAPS 1 detent. [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

In Primary mode operation, how are leading edge flaps (LEF) and trailing edge flaps (TEF) powered?

LE - Pneumatically; TE - Hydraulically — The system description identifies the relevant source/actuation: “Secondary flight controls include a moveable horizontal stabilizer, spoilers, and leading and trailing edge flaps.” That is why the correct source is LE - Pneumatically; TE - Hydraulically. [Ref: FCOM 9.20.1]

Due to EICAS message FLAPS CONTROL you have to use Alternate Flaps extension. What is the maximum flaps setting?

Flaps 25 [Ref: FCOM 9.30.1]

What happens when moving the flap lever from the FLAPS 1 to the FLAPS 5 position?

Outboard LE flaps extend and TE flaps move to flap 5 position — The condition/timing specified by the card is: Outboard LE flaps extend and TE flaps move to flap 5 position. [Ref: FCOM 9.20.14]

Which flaps drive systems have asymmetry protection?

Primary and secondary [Ref: FCOM 9.30.1]

What is the purpose of the flaps lever gate at the flaps 20 position?

Prevents inadvertent retraction of flaps past the go-around position [Ref: FCOM 9.10.9]

What is the purpose of the flaps load relief system?

Protects the flaps from excessive air loads if flap airspeed limits are exceeded with flaps 25 or 30 selected. Works in Primary mode only. [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

What does the EICAS advisory message FLAPS PRIMARY mean?

One or more flap groups operating in secondary control mode [Ref: FCOM 9.30.1]

How are the flaps powered in the secondary control mode?

Electrically — The system description identifies the relevant source/actuation: “FLAPS PRIMARY Caution Beeper One or more flap groups operating in secondary control mode.” That is why the correct source is Electrically. [Ref: FCOM 9.30.1]

Which hydraulic systems power the trailing edge flaps?

1 and 4 — The system description identifies the relevant source/actuation: “Secondary flight controls include a moveable horizontal stabilizer, spoilers, and leading and trailing edge flaps.” That is why the correct source is 1 and 4. [Ref: FCOM 9.20.1]

Which of the following is indicated by the EICAS caution message STAB TRIM UNSCHD?

Stabilizer movement without a trim signal [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

What will happen when the stabilizer trim switches on the control wheels are actuated with multiple autopilots engaged?

Nothing - they are inhibited during autoland. Two actuators are used, so the stabilizer moves at NORMAL TRIM rate. — The condition/timing specified by the card is: Nothing - they are inhibited during autoland. Two actuators are used, so the stabilizer moves at NORMAL TRIM rate.. [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

What occurs when the alternate stabilizer trim switches are used with any number of autopilots engaged?

They override A/P trim inputs but do not disengage the A/P. The pilot is warned via a STAB TRIM UNSCHD caution message. — The condition/timing specified by the card is: They override A/P trim inputs but do not disengage the A/P. The pilot is warned via a STAB TRIM UNSCHD caution message.. [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

Which hydraulic systems power the stabilizer trim?

2 and 3 — The system description identifies the relevant source/actuation: “9.10 Pitch and Stabilizer Trim Systems .” That is why the correct source is 2 and 3. [Ref: FCOM 9.10.1]

What occurs when the stabilizer trim switches on the control wheel are actuated with a single autopilot engaged?

A/P is disengaged — The condition/timing specified by the card is: The A/P is disengaged. [Ref: FCOM 9.20.1]

Which trim is affected by the control column cutoff function?

STAB trim [Ref: FCOM 9.20.5]

Hydraulic power for the elevators is provided by which hydraulic systems?

Hyd 1 - left outboard; Hyd 4 - right outboard; Hyd 1 & 2 - left inboard; Hyd 3 & 4 - right inboard [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

What stabilizer trim condition exists when both stabilizer trim cutout switches are in the CUTOUT position?

Hydraulic power is shut off — The condition/timing specified by the card is: Hydraulic power is shut off. [Ref: FCOM 9.10.1]

Why are the outboard ailerons locked out?

To prevent overcontrolling at high airspeeds and provide the required roll authority at low airspeeds. They lock in neutral at 238 kts. [Ref: FCOM 9.20.7]

What does the aileron trim indicator display?

Aileron trim units [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

What is one of the required conditions for automatic speedbrake extension with the speedbrake lever in the ARM position?

Main gear on ground and thrust levers 1 and 3 near idle — The FCOM describes the triggering logic as “747 Flight Crew Operations Manual Preface - V1V2 List of Effective Pages * = Revised, Added, or Deleted Boeing Proprietary.” Those are the conditions that lead to Main gear on ground and thrust levers 1 and 3 near idle. [Ref: FCOM 9.20.11]

Which statement is true when the EICAS advisory message SPEEDBRAKE AUTO is displayed?

Speedbrakes can still be operated manually — The FCOM describes the triggering logic as “described in Chapter 15, Section 20, “Takeoff and Landing Configuration Warning System.” Message Level Aural Message Logic AILERON LOCKOUT Advisory.” Those are the conditions that lead to Speedbrakes can still be operated manually. [Ref: FCOM 9.30.1]

How many spoiler panels are on each wing?

6 [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

With the speedbrake lever in the armed position, what does the EICAS message SPEEDBRAKE AUTO mean?

A fault is detected in the automatic ground spoiler system that could result in inadvertent spoiler extension [Ref: FCOM 9.30.1]

When are the outboard ailerons locked out?

At high airspeed — The condition/timing specified by the card is: At high airspeed. [Ref: FCOM 9.30.1]

What is the function of the RUDDER RATIO changers?

Limit rudder deflection with increasing speed [Ref: FCOM 9.20.9]

What does the EICAS advisory message RUD RATIO SNGL mean?

Upper or lower rudder ratio changer fault detected [Ref: FCOM 9.30.1]

What functions do the yaw damper systems provide?

Improve airplane lateral and directional stability and provide turn coordination [Ref: FCOM 9.20.9]

How many yaw damper systems are there?

2 systems — The correct quantity is 2 systems. [Ref: FCOM 9.20.1]

What does the EICAS message YAW DAMPER LWR or UPPER mean?

Yaw damper failure or Power Failure [Ref: FCOM 9.30.2]

What does the rudder trim indicator display?

Units of rudder trim, toward nose left or nose right [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]

What does rotating the rudder trim knob do?

The rudder feel and trim mechanism repositions the rudder pedal neutral point [Ref: FCOM Chapter 9 — Landing Gear - Controls and Indicators]