Digital Autopilot Flashcards
what is minimum altitude for engagement?
500 AGL provided below 180IAS and one pilot has control wheel
1000 AGL otherwise
what flap setting can we use with the AP engaged?
1 or up
when is the only time the A/P can be engaged below 1000ft?
coupled approach
or down to 500 AGL with one pilot on control wheel, except for coupled approach
what is max airspeed for autopilot operation?
Vmo
what is minimum airspeed for autopilot operation?
85IAS in IAS mode or Vmc in any other mode
when can we not use altitude hold mode?
in severe turbulence
what must we do with the autopilot when flying in non-certificated/icing conditions?
disengage
what is the roll command limit?
+- 25 degrees
what is the pitch command limit?
+18 degrees -15 degrees
what 6 conditions will cause the AP to automatically disengage?
- electrical power failure
- AFGS failure
- AHRS failure
- STALL warning
- pitch and/or roll servo failure disengages the AP only
- yaw servo failure disengages the yaw damper only
what is a hardover?
A servo failure, the pilot will recognise that the airplane leaves the intended flight path
what action should we take with the yaw damper if the engine fails?
- disconnect the yaw damper
- retrim
- reconnect yaw damper
what will we see if we have a DCU failure?
amber boxed DCU indication is displayed on the PFD and all flight guidance info is lost on the pilots and co pilots PFD
what signals a trim runaway?
TRIM IN MOTION aural announcement triggered by a 12 second auto trim motion
what will stay active if VOR/LOC signal becomes invalid or is lost?
lateral NAV/APPR modes
when must the autopilot be disconnected on an ILS coupled approach?
before a descent through 150ft AGL
can we operate the autopilot with a DCU failure?
no
what will we hear if the AP is switched off then back on within a couple of minutes?
a beep tone
what can we expect if flying a coupled approach that doesn’t start from the normal FAP/FAF?
slightly more roll and pitch motion than normal at DA
what provides roll, pitch and body acceleration data to the autopilot?
2 AHRS’s on an ARINC 429 bus via 2 AHRS systems installed in the aircraft
what provides air data such as altitude, IAS and vertical speed to the autopilot?
2 ADC’s
what provides flap position info to the autopilot?
2 EIUs
what provides pitch trim up and down commands?
DCU
what does the flight guidance computer do?
controls roll, pitch and yaw axes through selected modes of operation
what does the flight guidance control panel do?
provides push buttons to select flight director/autopilot modes
what are the AP servos used for?
as an interface of the flight guidance computer to the aircraft control systems
what does each servo incorporate?
a DC motor, capstan and digital bus interface electronics
if the FD is disengaged and we engage it with no preselected modes, what will it default to?
pitch and roll
it will hold the roll if greater than 5 degrees or level the wings if less than 5
what does the yaw damper do when engaged?
dampens any excessive yaw and coordinates turns
when must the yaw damper be disengaged?
T/O and landing
what nav sources does the AP use in NAV mode?
VOR 1/2
FMS
what happens in NAV mode if the reference signal fails?
NAV mode fails until the signal is valid again
if in NAV mode the reference signal is lost what will the autopilot hold?
last known crosswind corrected course
when will GS mode arm on the approach?
half scale delfection
what does half bank mode do?
reduces maximum bank angle to 12.5 degrees
if on the ground what will pressing TOGA do?
- 11.2 degree pitch up command
- roll hold at wings level as default
- ROLL and PITCH indications on EFIS
- change to HDG mode when HDG is pushed
- change to NAV mode when NAV is pushed
