Communications

Question 1

What does selecting a radio transmitter switch do?

(SH)

Answer 1

The active switch illuminates when the respective transmitter is active.

Question 2

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

Answer 2

NORM: normal operation of ACP.

ALT: ALTernate operation. Results in degraded mode.

Transmitter selectors are non functional.
Receiver selectors are non functional.
Usable radio is at preset volume through the headset.

Following are inhibited:
Speaker and Speaker switch
Flight and service inter phone
Control wheel PTT and ACP PTT
Hand Mic
»>Audio warnings for altitude alerts«<
»>GPWS and Windshear alters«<
Making PA’s through the ACP.

Question 3

What is the purpose of the VHF Test switch?

(SM)

Answer 3

Removes the squelch feature, allowing background noise and testing receiver operation. Removing the squelch improves the reception of a weak signal.

Question 4

What does the white offside tuning light indicate?

(SM)

Answer 4

Shows if the RTP is tuning an offside radio.

Question 5

What is the indication of a radio failure?

(SM)

Answer 5

FAIL on both windows of the RTP.

Question 6

Which switch is used to key transmission over the selected transmitter?

(SM)

Answer 6

PTT on radio, RTP, or Hand mic. (NG)

Plus the glareshield button on the MAX.

Question 7

Communications:

What is the indication of an RTP failure?

(SM)

Answer 7

PANEL FAIL in the frequency windows.

Question 8

What precautions, if any, should be taken when keying an HF radio on the ground?

(SM)

Answer 8

Do nut use while refuel/defueling.

Personnel stay a minimum of 10 feet from the vertical stabilizer when transmitting.

If aft door is open delay test or use.

Question 9

What is the purpose of the PA hand mic on the aft electronic panel?

(SM)

Answer 9

Soley for PA’s. Bypasses the ACP.

Question 10

How is an incoming SELCAL indicated?

(SM)

Answer 10

When the four tone code is received, a white call light is illuminated, and a chime sounds.

Question 11

How are the MEDLINK headset jacks controlled?

(SM)

Answer 11

ACP3 ( Observers panel)

Question 12

What is the purpose of the service interphone switch on the aft overhead panel?

(SM)

Answer 12

Allows communication with headset using external jacks, as well as FA’s.

ON = FA’S plus external jacks

OFF = FA’s only.

Question 13

How are incoming calls from the passenger cabin handsets indicated?

(SM)

Answer 13

White C indicator on the ACP, and a single chime.

Question 14

What does the GRN CALL switch do when pushed?

(SM)

Answer 14

Sounds a horn in the nose wheel well.

Question 15

What does the ATTEND switch do when pushed?

(SM)

Answer 15

Sounds a two-tone chime in the cabin as well as illuminated pink Master Call lights.

Question 16

In what order of radio selection does the communication system attempt data transmission?

(SM)

Answer 16

Attempts the below sources, using the next if the prior is not available.

1 - VHF (Line of sight, 150-200nm from station)
2 - SATCOM
3- HF