Communications Systems

Question 1

What is the purpose of the OBS Audio System switch on the overhead panel? AOM II 5-8

Answer 1

If Captain or FO ACP is inoperative, it allows their audio to be controlled with the Observer’s ACP

Question 2

When illuminated, what does the Offside Tuning Light indicate? AOM II 5-21

Answer 2

The lighted Radio Tuning Panel is used to tune a radio not normally associated with this radio tuning panel.
The radio normally associated with this panel is being tuned by another radio tuning panel.

Question 3

How many VHF radios are installed? AOM II 5-22

Answer 3

3 (L, C, R)

Question 4

With 121.5 selected on the R VHF, can the receiver volume control for that radio be turned OFF? AOM II 5-2

Answer 4

NO, but it can be turned all the way down.

Question 5

How can you monitor for an IM signal during a CAT II Approach? AOM II 5-2

Answer 5

On ACP, select MKR and push volume knob.

Question 6

How can we tune Data into the C VHF? AOM II 5-2

Answer 6

Dial above 136.000 or below 118.000 on the big knob and transfer

Question 7

How is the O2 mask microphone operation verified during preflight? AOM I NP-32

Answer 7

Select FLT microphone on the ACP
Speaker ON
Select Push-to-Test on O2 panel along with Emer knob
Simultaneously press a PTT button (glass shield, yoke, ACP etc…)
On certain aircraft, you must also select OXY on ACP and turn back to BOOM afterwards.

Question 8

What should we see when pushing the cockpit voice recorder TEST button? AOM I NP-25

Answer 8

Pulsating indications on meter

Question 9

How many PTT switches are in the cockpit? AOM II 5-21

Answer 9

7-10 depends on aircraft (glare shield x2, yoke x2, ACP x3, hand mic x3)

Question 10

Selecting the SERV inter phone switch to ON does what? AOM II 5-28

Answer 10

Connects ground crew stations around the aircraft to the Flight Intercom.