05 - Communications

Question 1

COMMUNICATIONS
1. What does selecting a radio transmitter switch do?

Answer 1

Selects which radio transmitter is active and automatically enables reception on the same radio

SH 5.020 p1

Question 2

COMMUNICATIONS

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

Answer 2

• NORM allows for normal operation of the ACP
• ALT allows for alternate operation (degraded mode) in the event of an ACP panel malfunction

SH 5.020 p2

Question 3

3. What is the purpose of the VHF TEST switch?

Answer 3

It removes the automatic squelch feature, permitting reception of background noise and thereby testing receiver operation, thus improving reception of a weak signal.

SH 5.020 p4

Question 4

4. What does the white offside tuning light indicate on the RTP?

Answer 4

A transceiver other than the onside VHF is selected

SH 5.020 p3

Question 5

5. What is the indication of a radio failure?

Answer 5

The two frequency indicators show “FAIL”

SH 5.020 p4

Question 6

6. What is the indication of an RTP failure?

Answer 6

The frequency indicators show “PANEL FAIL”

SH 5.020 p4

Question 7

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

Answer 7

• PTT switch on each hand mic
• Headset boom mic has multiple PTTs for transmission;
• One on each side of the glare shield (MAX only),
• one on each control wheel,
• one on each ACP

SH 5.020 p5

Question 8

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

Answer 8

It is only used to make PAs

SH 5.020 p6

Question 9

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

Answer 9

Warning! Do not key the HF radio while the A/C is being fueled/defueled.

Warning! Ensure that personnel stay a min of 10’ from the vertical stabilizer when the HF system transmits. Energy from the antenna can cause injuries. Do not operate the HF radio while the aft service door or entry doors are opened.

SH 5.020 p8

Question 10

10. How is an incoming SELCAL indicated?

Answer 10

The white call (C) light illuminated on the ACP and a chime sounds

SH 5.020 p14

Question 11

11. How are the MEDLINK headset jacks controlled?

Answer 11

The observer’s ACP (ACP 3)

Question 12

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

Answer 12

The Service Interphone SYSTEM provides intercommunication between the Flight Deck, Flight Attendants, and Ground Personnel.

The Service Interphone SWITCH (ON) allows MX personnel to connect via several external jacks in various positions around the aircraft.

With the SERVICE INTERPHONE switch OFF, communication between the Flight Deck and Flight Attendants is still possible; however, all external jacks are deactivated.

Question 13

13. How are incoming calls from the passenger cabin handsets indicated?

Answer 13

When 2 is pressed on a cabin handset, it sounds a chime and illuminates the CABIN call light on the ACP

Question 14

14. What does the GRD CALL switch do when pushed?

Answer 14

It sounds a horn in the nose wheel well

Question 15

15. What does the ATTEND switch do when pushed?

Answer 15

Pushing the ATTEND switch sounds a two-tone chime in the Passenger Cabin and illuminates both pink Master Call lights in the cabin

Question 16

16. In what order of radio selection does the Datalink Communication System attempt data transmission?

Answer 16

VHF
SATCOM
HF

Question 17

EXTRA CREDIT
Which radio defaults to DATA on power up and at power down?

Answer 17

VHF 3