Avionics Flashcards
When does the altimeter “off” flag come on?
- No power (26v fixed AC system)
- During a ADC test
- No ADC input (ADC has failed or no signal to gauge)
What provides data input to the main altimeters?
The Air Data Computer
What are the airspeed indicators driven by?
A direct feed from pitot pressure and static lines
What is the input to the standby altimeter?
Alternate static only
What system drives the VSI’s?
Air Data Computer
What power sources are used by the Captain’s and the F/O’s APIRS systems? (1 and 2 respectively)
Capt. Primary - L Essential Bus
Capt. Secondary - R Essential Bus
F/O Primary - R main bus
F/O Secondary - L essential bus
What does a green “basic” light on the APIRS controller indicate? What would you do in flight?
Fiber optic gyros not receiving a TAS input, therefore it will behave like a conventional gyro, and will have drift/acceleration errors.
To fix - engage ATT REV button on controller, which then uses attitude information from the opposite AHRU.
What does ATT 2 in amber on the captain’s side EADI mean?
ATT 1(AHRU) has failed.
Attitude information being provided by F/O AHRU (2).
Will “basic” mode ever Illuminate in flight?
Only if both AHRU’s fail.
Information automatically generated from opposite side AHRU in flight.
The green light will illuminate once on the ground/after landing however.
What does the SLAVE light on the APIRS controller indicate? What should you do in flight?
No information being received by the flux valve on that side.
Press HDG REV button.
Will the compass indicate correctly when the aircraft is unpowered?
No
They are calibrated to be accurate with all aircraft systems operating normally so will indicate abnormally without aircraft power.
What is the indication of a symbol generator failure?
All 3 screens on that side go blank, or a full screen of red x’s
What is the corrective action after a symbol generator failure?
REV button above EADI
What does it mean it’s one screen goes blank? How do you enter composite mode on the working screen?
The screen has failed.
Turning that screen off using the rotary knob on the display control panel will automatically activate composite mode.
What flap setting is approved for approaches with a glideslope of greater than 3°?
Flap 15° only.
The ARTEX ELT beacon transmits on what frequencies and for how long?
- 5mhz and 243mhz for 72 hours
406. 025mhz for 24 hours
What 3 things is the alternate static connected to?
Alternate static selection valve
Standby altimeter
Cabin altitude controller
Where do the ADC’S get power from?
L and R main buses respectively
Where are the flux detection units (FDU’S) found?
In the wingtips
How long will it take for the APIRS systems take to align on the ground and in the air?
60 seconds on the ground,
90 seconds in the air
Push ATT/HDG align button for 2 seconds to start alignment.
Flags will go out once the test is complete.