Communication

Question 0

When does the Cockpit Voice Recorder begin recording?

Answer 0

Any time the aircraft is powered the CVR will record the last two hours of:
Flight Deck Communications (Pilot, Copilot and Observer microphones)
Flight Deck area microphone
Passenger Address Announcements
Clock Data

Question 1

If the primary power source for the Passenger Address and Communication Interphone System fails, how is it powered in an emergency?

Answer 1

Through the emergency light battery packs

Question 2

When will the Flight Data Recorder operate and where is it located?

Answer 2

The FDR is located in the tail and will record data whenever any of the three conditions are met:
The Anti-Collision switch is set to RED or WHITE
Both engines are running (based on oil pressure)
The airplane is airborne (WOW)

Question 3

Who has priority over PA announcements?

Answer 3

Flight Deck
A flight attendant handset
B flight attendant handset

Question 4

What are the two power sources for ARCDU 1?

Answer 4

The Right Main 28vDC bus

The Left Essential 28vDC bus

Question 5

What are the two power sources for ARCDU 2?

Answer 5

The Left Main 28vDC bus

The Right Essential 28vDC bus

Question 6

How does ARCDU 1 make PA announcements in the case of an emergency?

Answer 6

The Hot Battery Bus supplies 28vDC power through a 7.5 ampere circuit breaker to ARCDU 1