Communications

Question 1

When does the CVR operate?

Answer 1

When the aircraft electrical system is powered, the CVR records the last two hours.

Question 2

When does the FDR operate?

Answer 2

With power available, the FDR will record if:

• Anti collision light is set to RED or WHITE
• Both engines running (based on oil pressure)
• aircraft airborne
• FLIGHT DATA RCDR switch is held at GND TEST

Unit records 25 hours of data in a continuous loop format. An inertia switch removes power from the system if the G-forces are more than the present limits.

Question 3

What will happen when you select EMERG mode? (NORM/EMERG switch on ARCDU)

Answer 3

If RCAU fails, a FAIL message is shown on the second line of the INT display area, on the ARCDU. Setting the NORM/EMERG switch to EMERG on ARCDU1 connects the pilots headset directly to VHF Comm 1 audio output, and INT audio on side only, and provides a direct connection of the pilots transmitter key line to VHF Comm 1 (when keyed).

Same for copilot on ARCDU2, if done on ARCDU2.

Red EMERG message on the third line of the INT display area.

Question 4

What’s the difference between the CALL and EMERG button on ARCDU?

Answer 4

Same as call key except:

• amber EMERG lights on ARCDU, and both the F/A keyboard (fwd) and handset (aft), will flash.
• red flashing annunciator on the cabin attendant advisory light panels
• chime sound is broadcast in the flight compartment and in the cabin
• selection of EMERG mode at any other station overrides and postpones the CALL mode.