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6-1) When will the CVR operate and how much does it record?
When the airplane electrical system is powered, a solid state Cockpit Voice Recorder (CVR) system, located in a crash-survivable case in the airplane tail, records the last two hours of: All flight crew communication (Pilot/copilot/observer headsets), Flight deck area microphone (Area Microphone), PA announcements, Clock data (CFM Vol. II Chapter 6)
6-2) Where is the ELT located?
In the tail of the aircraft (CFM Vol. II Chapter 6)
6-3) Can the FMS control any ARCDU functions?
Yes, it can tune the comm and nav radios (CFM Vol. II Chapter 6)
6-4) What does the BOOM/MASK switch do?
Selects between headset boom microphone and the microphone in the oxygen mask. (CFM Vol. II Chapter 6)
6-5) Is the ARCDU a radio unit?
No, it is an interface unit to control the radios (CFM Vol. II Chapter 6)
6-6) Is the VHF1 Standby control unit an independent radio?
No, it uses the same radio as ARCDU 1 but has its own dedicated antenna. (CFM Vol. II Chapter 6)
6-7) If the aircraft power fails, will the PACIS work?
The emergency lighting batteries will power a relay that switches the PACIS power source to the Battery Bus. (CFM Vol. II Chapter 6)
6-8) When will the FDR operate and how much does it record?
With airplane power available, the FDR will begin recording when any of the following three conditions are satisfied: Anti-Collision light switch set to RED or WHITE, Both engines running (based on oil pressure), Airplane is airborne. It records 25 hours of data (CFM Vol. II Chapter 6)
6-9) What happens when the EMERG mode is selected on the ARCDU?
When EMER is selected on the pilot’s ARCDU: The pilot’s headset and microphones are directly routed to VHF 1, the pilot’s interphone and navigation receiver are directly routed to the headset, and Audio level is fixed for VHF 1 and INT When EMER is selected on copilot’s ARCDU: The copilot’s headset and microphones are directly routed to VHF 2, the copilot’s interphone and navigation receiver are directly routed to the headset, and Audio level is fixed for VHF 2 and INT When in the EMER position, the PTT/INPH switch must be selected to PTT for access to onside COMM. Only the audio aspect of the Interphone function is available when operating in EMER mode and the Microphone/Interphone selector is ineffective. (CFM Vol. II Chapter 6)
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