Automatic Flight Flashcards
From left to right, what are the three FMA mode annunciations?
• autothrottle
• roll
• pitch
How is independent F/D operation indicated on the MCP?
INDEPENDENT F/D OPERATION
Independent F/D operation is indicated by illumination of both MA lights (each FCC is controlling modes for related F/D).
Except for when APP is engaged, what will selecting the non-operating A/P do?
Pushing the engage switch for the second A/P (when not in the approach mode) engages the second A/P and disengages the first A/P.
What does an amber CWS R or CWS P on the Flight Mode Annunciator mean?
CWS R (CWS Roll) and the pitch and/or roll mode on the Flight Mode Annunciator (FMA) is blank.
With CWS engaged, the A/P maneuvers the aircraft in response to control pressures applied by either pilot. The control pressure is similar to that required for manual flight. When control pressure is released, the A/P holds existing attitude.
What causes the Autopilot to automatically disengage?
The A/P automatically disengages when any of the following occurs:
- pushing either A/P disengage switch
- column or wheel force override
- pushing either Takeoff/Go-around (TO/GA) switch with a single A/P engaged in CWS or CMD:
• below 2000 ft RA, or
• at any altitude with Flaps extended or G/S engaged
- pushing either TO/GA switch with a single A/P engaged in CWS or CMD above 2000 ft RA with flaps not up, or G/S engaged
- pushing either TO/GA switch after touchdown with both A/Ps engaged in CMD
- pushing an illuminated A/P ENGAGE switch
- pushing the A/P DISENGAGE bar down
- activating either pilot’s control wheel trim switch
- moving the STAB TRIM AUTOPILOT cutout switch to CUTOUT
- either left or right IRS system failure or FAULT light illuminated
- loss of electrical power or a sensor input which prevents proper operation of the engaged A/P and mode
- loss of respective hydraulic system pressure
NOTE: Loss of the system A engine-driven hydraulic pump, and a heavy demand on system A, may cause A/P A to disengage.
What does the STAB OUT OF TRIM (amber) light indicate?
When illuminated, the autopilot is not trimming the stabilizer properly (light illuminated and stabilizer trim is not operating).
What system normally provides N1 limit values for the Autothrottle system?
In normal operation, the FMC provides the A/T system with N1 limit values.
Which FMA annunciation indicates that power has been removed from the Autothrottle servos? When does this occur?
The ARM mode means that no active A/T mode is selected; however, the A/T is enabled and ready to receive commands. A/T control logic prevents the A/T servo motors from moving the throttles.
The A/T are in the ARM mode when:
- the aircraft is on the ground prior to takeoff with the A/T ARM switch in ARM
- after THR HOLD mode above 800 ft
- during descent RETARD when the thrust levers reach the aft stops
What mode will the A/T be in during a V/S descent? LVL CHG climb?
V/S descent A/T mode is Speed (SPD) mode
LVL CHG climb A/T mode is N1
What pitch mode will the FMA annunciate in LVL CHG?
MCP SPD
The bank angle selector sets maximum bank angle for AFDS operation in which roll modes?
HDG SEL or VOR modes
What happens when deviating by 200 ft or more from a target altitude?
When deviating by 200 ft from the selected altitude:
- a momentary tone sounds, and
- the current PFD altitude box turns amber and begins to flash
After selecting TO/GA, what pitch attitude will the AFDS initially command on a two engine go-around? Single engine go-around?
Two Engine - 15 degrees
One Engine - 13 degrees
On a go-around with the Autothrottle armed, what will one push of the TO/GA switch command? Two pushes?
F/D pitch commands 15° nose up until reaching programmed rate of climb. F/D pitch then commands target airspeed for each flap setting based on maximum takeoff weight calculations.
With the second push of either TO/GA switch (if A/T engaged and after A/T reaches reduced go-around thrust):
- the A/T advances to the full go-around N1 limit
If windshear is encountered during a F/D Takeoff or Go-Around, what will the F/D initially command for pitch? What does the F/D command if the Vertical Speed decreases to +600 fpm?
If windshear is encountered during F/D takeoff or go-around, the F/D pitch command bar provides commands to maintain the target speed until vertical speed decreases to approximately +600
fpm. At this point, the F/D pitch bar commands a 15° nose-up pitch attitude.
