Communications

Question 1

Describe the cockpit indications of an incoming cabin or ground call

Answer 1

Blue CALL light (fwd ovhd panel)

Call to flight deck by attendant or ground crew accompanied by single high chime

Question 2

Explain the meaning of an illuminated offside tuning light on the radio tuning panel

Answer 2

Offside tuning light illuminated (white)
- The radio normally associated with this panel is being tuned by another radio tuning panel
OR
- the radio tuning panel is being used to tune a radio not normally associated with this radio tuning panel

Question 3

Explain how to activate or deactivate the O2 mask microphone

Answer 3

The O2 mask microphone is enabled, and the boom microphone disabled when the right O2 mask panel door is open.
The O2 mask microphone is disabled, and the boom microphone is enabled when the right O2 mask panel door is closed and the TEST/RESET switch is pushed

Question 4

Describe the flight interphone, service (attendant) interphone. And PA system

Answer 4

Flight interphone:
The flight interphone system is an independent communication network. Its primary purpose is to provide private communication between flight deck crew members without intrusion from the service interphone system. The ground crew may also use the flight interphone system through a jack at the external power receptacle

Service (Attendant) Interphone System:
The service interphone system provides intercommunication between the flight deck, flight attendants, and ground personnel

PA System:
The PA system allows flight deck crew members and flight attendants to make announcements to the pax. The PA system use is prioritized . Flight deck announcements have first priority and override all others.

Question 5

Describe the operation of the audio control panel (ACP)

Answer 5

Transmitter Selector (MIC SELECTOR) switch:
- Illuminated: related switch is active
- Only one switch may be selected at a time; pushing a second switch deselects first switch
- Reception is possible over the selected system regardless of whether the related receiver switch is on

SELCAL light (a “C” in bottom of transmitter selector)
- Illuminated: accompanied by chime, alerts crew that communication is desired on indicated communication radio
- Will automatically reset when microphone is keyed, control wheel MIC switch is pressed or R/T I/C switch is positioned
to R/T

Receiver switches:
- Illuminated (white): related switch is active
- Multiple switches may be selected

Alternate-Normal (ALT-NORM) switch:
- NORM: ACP operates normally
- ALT: ACP operates in degraded mode

Question 6

Describe the degraded audio system operation

Answer 6

Audio system operation can be switched to a degraded mode by placing the ALT/NORM switch to ALT. In this mode, the ACP at that station is inoperative and the crew member can only communicate on one radio.

The radio available at each crew member station is:
- CA: VHF 1
- FO: VHF 2
- JS: VHF 1

NOTE: the hand mic is not usable in degraded mode. An audio system in degraded mode can’t access the PA system through the ACP

Question 7

Explain the function of the SERVICE INTERPHONE switch

Answer 7

OFF: external jacks are deactivated. Communication between the flight deck and flight attendants is still possible
ON: adds external jacks to service interphone system