Autopilot Flight Director System Flashcards
How does the AFDS control the the flight controls?
3 FCC, that power 3 A/P servos through hydraulics.
What is the FCC?
Flight Control Computer
What is the difference between land 2 or land 3 with regard to the AFDS?
Land 3 used all 3 FCC and A/P servos and is used for auto land
Land 2 only uses 2
What happens when the FD are selected on?
Engages TO/GA for roll and pitch on the FMA
What are the thrust modes on takeoff?
THR REF once TO/GA is pressed and TO thrust is set.
HOLD once 65 kias is reached
Minimum AP engagement?
250’
What is a limitation of the aileron trim?
Use of aileron trim while the autopilot is engaged is prohibited.
What are the limitations for a single autopilot approach?
- Without LAND 2 or LAND 3 annunciated, the A/P must not remain engaged below 100 feet RA.
-The A/P must be disengaged before the airplane descends more than 50 feet below the MDA unless it is coupled to an ILS glideslope and localizer or in the go-around mode.
What are the limitations for autoland?
Headwind/Crosswind - 25 knots
Tailwind - 15 knots
CAT II/III Crosswind - 15 knots
3.25° to 2.5° Glideslope
Flaps 25 or 30
What are the A/T FMA annunciations?
THR
THR REF
IDLE
HOLD
SPD
What are the ROLL FMA annunciations?
TO/GA
LNAV
HDG SEL
HDG HOLD
LOC
ROLLOUS
ATT
What are the PITCH FMA annunciations?
TO/GA
VNAV SPD
VNAV PTH
VNAV ALT
V/S
FLCH SPD
ALT
G/S
FLARE
When does LNAV become active?
50’ after takeoff
What changes on the FMA when the AP is engaged?
CMD is displayed
When will the AFDS display autoland?
Passing through 1,500’
The maximum headwind on an autoland approach is ______.
25 kts
T/F: During single A/P controlled flight the rudder is operated by an A/P servo.
False
Which ATS thrust mode engages after a TO/GA switch is pressed during takeoff?
THR REF
What is the initial FD pitch on takeoff?
8° to V2 + 10 to V2 + 25
What will the FMA display in flight if the FD are turned on?
HDG HOLD and V/S unless the bank is more than 5° then ATT will be displayed
What indicates the A/T are armed?
The A/T switch position
When are the A/T no available?
If both FMCs fail or two or more engines are shutdown
What does the THR switch do?
- If pressed when the pitch mode is VNAV, FLCH, or TO/GA it will change the FMC reference thrust limit to armed climb thrust limit, or CON if an engine is inoperative. The light in the THR switch will remain extinguished and you may verify the operation of the selection by viewing the thrust limit change on the EICAS or the CDU THRUST LIM page.
- If pressed when the pitch mode is ALT, V/S, or G/S the A/T mode activates THR REF and the thrust levers will advance to the thrust limit. The light in the THR switch will illuminate.
When can the THR switched be used?
400’ after takeoff to landing