HSI/ FDI/ EFDS

Question 0

Function of the FDSDC?

Answer 0

Generates a damped UHF-DF or OTPI bearing signal for display on HSI

Question 1

What is the function of the FDSC?

Answer 1

Generates ILS glideslope and localizer information for display

Provides fly-to-point steering from computer

Question 2

What is bearing pointer 1 on all 3 HSI’s?

Answer 2

Pilot bearing

Question 3

What is bearing pointer 2 on all HSI’s?

Answer 3

Flight station: copilot bearing

NAV/COMM: NAV/COMM bearing

Question 4

What is the purpose of the NAV/COMM heading marker?

Answer 4

Shows any mismatch angle between the INS heading outputs

Question 5

Where is the HSI test panel?

Answer 5

On the Forward NAV-J box.

Question 6

Good indications of pilot HSI test.

Answer 6

• NAV flag is masked from view
• Heading Dial and Course Arrow indicate 180*
• To-from arrow points same direction as Course Arrow
• Distance counter displays 555 on all HSI’s
• Bearing pointer 1 points to top of all HSI’s
• Bearing pointer 2 doesn’t move
• FDI sphere indicates 30* pitch down and 30* left roll
• Gyro flag comes into view.

Question 7

Good indications of copilot HSI test.

Answer 7

Same as pilot test except:

• Distance counter does not indicate
• Bearing pointer 2 on pilot and copilot HSI’s points to top
• Bearing pointer 1 does not move

Question 8

Good indications of NAV/COMM HSI test.

Answer 8

Same as pilot except:

• Distance counter does not indicate
• Bearing pointer 1 doesn’t move
• Bearing pointer 2 points to top of HSI
• Heading bug points to top of HSI

Question 9

Function of vert gyro.

Answer 9

Provides a backup attitude reference for FDIs and FDSC.

Question 10

Location and function of the ARA-50 amplifier.

Answer 10

• Rack F1

- Amplifies signal from UHF-DF/OTPI antenna and sends to receiver

Question 11

Where is the OTPI receiver?

Answer 11

Receiver 20 of ASCL receivers.

Question 12

Function of the ECAs.

Answer 12

Receive synchro information and amplifies it to sufficient power to be displayed.

Question 13

Function of the NAV-J box.

Answer 13

• Routes NAV, attitude, and status signals
• Switching of NAVAID, heading, and attitude as selected
• 26 Vac synchro excitation voltage for equipment that generates analog signals

Question 14

How do you initiate diagnostic mode for the MFDs?

Answer 14

Press the PUSH TEST for 2 seconds and within 5 seconds:

• Press HDG knob for 2 seconds for EFDI
• Press BRG knob for 2 seconds for EHSI

Question 15

How do you initiate IBIT for the EFDS?

Answer 15

-Press PUSH TEST for 2 seconds
-Conformation message is displayed
-Press PUSH TEST again for 2 seconds
Faults will be displayed in magenta text.

Question 16

How are course deviations indicated?

Answer 16

• 5* VOR/TACAN
• 1.25* Localizer
• .25* Glideslope

Question 17

Absent cards in ECA#1

Answer 17

1, 2, 12

Question 18

Absent cards in ECA#2

Answer 18

1, 2, 6