Chapter 5 – Communication Systems

Question 1

1. What is the purpose of the OBS Audio System switch on the overhead panel?

Answer 1

a. Allows Captain or FO to use Observer’s audio panel (AOM 5-8)

Question 2

2. When illuminated, what does the Offside Tuning light indicate?

Answer 2

a. The panel is selected to a radio normally associated with another radio tuning panel
b. A comm radio not normally associated with that radio tuning panel has been selected and may be tuned by another radio tuning panel (AOM 5-21)

Question 3

3. How many VHF radios are installed?

Answer 3

a. 3 (AOM 5-22)

Question 4

4. With 121.5 selected in the R VHF, can the receiver volume control for that radio be turned
   off?

Answer 4

a. No (AOM 5-2)

Question 5

5. How can you monitor for an IM signal during a CAT ll approach?

Answer 5

a. On ACP, select MKR and push APP volume knob (AOM 5-1)

Question 6

6. How can we tune DATA in the C VHF?

Answer 6

a. Dial beyond the frequency range until DATA appears and select transfer switch
(AOM 5-22)

Question 7

7. How is the oxygen mask microphone operation verified during preflight?

Answer 7

a. Select Flt on ACP, Speaker on, Select Push to Test on O2 panel along with EMER knob,
simultaneously push Interphone switch on ACP (AOM NP-32)

Question 8

8. What should be seen when pushing the cockpit voice recorder test button?

Answer 8

a. Push Test switch and observe pulsating indications on meter (AOM NP-25)

Question 9

9. How many PTT switches are in the cockpit?

Answer 9

a. 11 (2 on yoke, 2 on glareshield, 3 on ACPs, 4 handhelds) (AOM 5-21)

Question 10

10. Selecting the SERV interphone switch to ON does what?

Answer 10

a. Provides voice com between ground crew stations at various locations around airplane
(AOM 5-28) d