737 Systems: Communications Flashcards
What is the purpose of the ALT-NORM switch on the ACP?
NORM: ACP operates normally
ALT: ACP operates in degraded mode
The PTT switch, when toggled, transmits on which source?
Selected Source
What does the SERVICE INTERPHONE switch on the Aft Overhead do?
ON: Allows MX or service personnel external jacks to connect to the interphone system
OFF: Communication from the Flight Deck to Flight Attendants still possible, but the external jacks are deactivated
What does the ATTEND button do?
Sounds a two-tone chime in the cabin and illuminates both pink Master Call lights
How can the Flight Deck alert the Ground Crew?
By using the GRD CALL switch on the overhead, which sounds a horn in the nose wheel well when pressed
What is the purpose of the VHF TEST switch on the RTP?
Removes the auto squelch feature, permitting reception of background noise and thereby testing receiver operation
What is the indication of tuning an offside RTP?
A light above the frequency transfer switch, known as the OFFSIDE TUNING LIGHT
What failure messages could display on the RTPs, and what do they mean?
PANEL FAIL: The RTP panel has failed
FAIL FAIL: The radio itself has failed
What considerations should be made before keying the HF Radio on the ground?
While the aircraft is being fueled/defueled, as injury to personnel or a fire may result. And that personnel should remain 10ft from the vertical stabilizer when the system transmits to avoid injury.
Does the hand mic on the Aft Electronics Panel require the ACP to be tuned before making a PA to the cabin?
No, it bypasses the ACP
Why must the SELCAL light be reset?
No other calls may be received until the channel is reset
Which ACP is used to control the cabin MEDLINK headset jacks?
ACP 3 aka Observers ACP (On the overhead panel)
What is the priority of source selection for ACARS in the data mode?
1) VHF
2) SATCOM (if installed)
3)HF
