AVIONICS

Question 1

What items do the pitot heads feed?

Answer 1

Airspeed indicator and ADC, on respective side.

Question 2

Where does the ADC receive its pitot and static pressure from?

Answer 2

Pitot and static vents on their respective sides, the static ports or dual flush mounted.

Question 3

What is the cockpit control center for the autopilot and flight director?

Answer 3

Glareshield panel which controls the FGC

Question 4

What do the ADC’s supply?

Answer 4

Altimeters, Altitude alert, advisory display, FGC, AHRS, EFIC, XPDR, Spoilers, pressurization, PSEU, Rudder, overspeed warning.

Question 5

Is information from both ADC’s always in use? How is this controlled?

Answer 5

Yes, each ADC supplies instruments on it’s side.

Question 6

What standby instruments are the flight crew provided with?

Answer 6

Standby Attitude indicator, altimeter and compass

Question 7

When does a failure flag appear in a main altimeter?

Answer 7

If the data from the ADC is invalid or power fails or there is a discrepancy between displayed altitude and ADC output.

Question 8

What information does the AHRS system supply?

Answer 8

ATT and HDG information to instruments, ADC, FGC, and weather radar. Also the RMIs and advisory displays.

Question 9

You notice a HDG flag on your EHSI and a SLAVE advisory light on the AHRS controller, what has happened and what must you do (assume EFIS aircraft)?

Answer 9

Magnetic heading reference is invalid form the flux valve. can use opposite side instruments by pressing HDG REV on EFIS controller. Can press DG which puts the HSI in manual mode and slave it manually to the compass.

Question 10

You notice a ATT flag on your EADI and a BASIC advisory light on the AHRS controller, what has happened and what must you do (assume EFIS aircraft)?

Answer 10

ATT indicator will act as a conventional gyro, the TAS information from the ADC is invalid. Shallow turns should be avoided, the VG erect button can be used to re-set the gyro however only in S.L. flight.

Question 11

Can the aircraft be moved during the AHRS initialization period?

Answer 11

the aircraft must remain stationary for 3 minutes

Question 12

Are the flight guidance computers both active at all times?

Answer 12

The flight guidance computers both monitor the aircraft but only one is engaged at once, if one fails the other takes over.

Question 13

What indication will you get if an active flight guidance computer fails?

Answer 13

L or R AP fail message and the other FGC will become active.

Question 14

What is the radio altimeters maximum altitude indication?

Answer 14

2500ft

Question 15

What connection is there between the yaw damper and autopilot?

Answer 15

The yaw damper operates with or without the autopilot, the yaw damper is separate from the autopilot however receives yaw data from the FGC.

Question 16

On the AFCS controller, what is the function of the HSI SEL button?

Answer 16

It determines which pilots instruments supply data to the FGC.

Question 17

In approach mode, can the G/S be captured before the localizer?

Answer 17

No, the localiser must be captured first

Question 18

When the flight director is in NAV mode; where does the auto-pilot accept steering commands from?

Answer 18

It will follow the displayed guidance on the selected HSI

Question 19

The altitude alert annunciator on the servo altimeter illuminates when the aircraft is within how many ft of the preselected altitude?

Answer 19

1000ft and extinguishes at 250ft remaining. If the aircraft deviates more than 250ft from selected it will also turn on.

Question 20

What happens if a Symbol Generator fails? What can you do to rectify the situation?

Answer 20

A red cross or blank screen. The opposite side symbol generator has enough power to run both sides.

Question 21

In APP mode what happens below 1200’ AGL?

Answer 21

if both VHF are tuned to the same ILS and both HSI in VL, then dual approach mode will be entered. if one nav receiver fails the approach can continue.

Question 22

In dual couple approach mode, what happens if a navigation receiver fails?

Answer 22

if one nav receiver fails the approach can continue.

Question 23

If you depress the GA pushbutton what happens?

Answer 23

The autopilot will disengage, wings level, GA, 9/12 deg NU will be commanded by the FGC on the FD.

Question 24

What indication will you get of a FD failure?

Answer 24

FD fail message on the EHSI, all FD cues will disappear.

Question 25

The Dash 8 Sperry EFIS uses how many CRT’s? What conventional instruments does EFIS replace?

Answer 25

4 CRT screens, replace, ATT, HSI and all Nav instruments.

Question 26

How do you get a composite display on your EFIS? Do the pilots and co-pilots EFIS controllers control the operation of the weather radar?

Answer 26

A composite display is achieved by turning the other screen all the way to off. The weather radar is operated by its own controller but to display it on the EHSI is selected on the EFIS controller.

Question 27

Who has access to the alternate static source?

Answer 27

Both sides via a selector, the cabin controller and the STBY ALT run off it normally.

Question 28

What does the AFCS consist of?

Answer 28

AHRS
DADC
RADALT
EFIS
FGC

Question 29

To what does the ADC supply outputs?

Answer 29

FGC
AHRS
Advisory displays
EFIS
Altimeters
Altitude selector
Autopilot

Question 30

If one FGC fails what happens?

Answer 30

A message is displayed on the advisory panel, the AP and YD swap sides with illumination of the other side selector.