Communications

Question 1

Is the PA system available on battery power?

Answer 1

Yes! Powered on Battery Bus

Question 2

Where are the audio systems for the flight deck located?

Answer 2

Physical radios are located in the E&E compartment

Question 3

What is the purpose of the ALT-NORM switch on the ACP?

Answer 3

Allows use of radio in the event of a malfunction
Hardwires ACP1 to VHF1 and ACP2 to VHF2, ACP3 to VHF1
NORM-ACP = operating normally
ALT-ACP = operates in degraded mode (if you’re both in alternate, you will not get any aural callouts (GPWS, etc))
SH 5.010 pg 4 & 8

Question 4

The Push-To-Talk switch, when toggled, transmits on which transmitter?

Answer 4

Whatever is selected
SH 5.010 pg 3

Question 5

What does the Service Interphone switch do?

Answer 5

Connect external headset jacks on the airplane (on the aft overhead panel)
SH 5.010 pg 10

Question 6

What does the VHF TEST switch do?

Answer 6

Removes Auto squelch feature - allowing background noise and potentially aiding reception of weak signals
SH 5.010 pg 16

Question 7

What is the indication of tuning the offside Radio Tuning Panel (RTP)?

Answer 7

Offside Tuning (White) Light = indicates radio usually associated with that panel is being tuned by another RTP or vice versa
SH 5.010 pg 16

Question 8

What failure messages display on the RTPs, and what do they mean?

Answer 8

FAIL/FAIL = the selected radio has failed PANEL/ FAIL = panel has failed
SH 5.010 pg 17

Question 9

What considerations should be made before keying the HF radio on the ground?

Answer 9

Do not key the HF Radio while the aircraft is being fueled/defueled. Injury to personnel or fire may result. Aft service doors should be closed.
SH 5.010 pg 18