Other Component and System Interfaces

The REU connects to these other components:

· Communications radios - the REU sends push-to-talk (PTT) and microphone audio to the transceivers and receives audio back from them

· Navigation receivers - the REU receives voice and Morse code identification tones.

The flight interphone system also has an interface with these other systems:

· Passenger address system - lets the flight crew make announcements to passengers

· Service interphone system - lets the flight crew speak with attendants and service personnel

· Voice recorder - records the flight crew microphone and receive audio

· Ground proximity warning computer (GPWC) - lets flight crew monitor warning signals

· Weather radar (WXR) - lets the flight crew monitor WXR windshear warnings

· Traffic alert and collision avoidance system (TCAS) - lets the flight crew monitor TCAS signals

· Flight control computer (FCC) - gives discrete signals to the REU. This signal activates an altitude alert tone generator.

Aural alerts for TCAS, weather radar, ground proximity, and altitude are heard at the captain, first officer, or observer headphones and at the flight interphone speakers.

Flight Compartment Component Locations

These are the captain and first officer flight interphone system components:

· Remote mic switch

· Control wheel mic switch

· Flight interphone speaker

· Hand mic jack

· Oxygen mask mic jack

· Boom mic jack

· Headphone jack

· Audio control panel.

The observer has these flight interphone components:

· Hand mic jack

· Oxygen mask mic jack

· Headphone jack

· Audio control panel.

Flight Interphone Component Locations

There are flight interphone system components in these locations:

· Electronic equipment compartment

· Flight compartment.

Electronic Equipment Compartment

The REU is on the E4-1 rack.

Flight Compartment

These are the flight interphone system components in the aft portion of the flight compartment:

· Observer headphone jack

· Observer mask microphone

· Observer hand microphone.

· Flight Interphone Jack

There is a flight interphone jack on the P19 external power panel.

General

Power for the flight interphone system comes through circuit breakers in the P6-2 circuit breaker panel.

The REU has three station cards and an audio accessory unit (AAU) card. Each card has a power supply for internal operation. The station cards supply 15v dc to the audio

control panels (ACP).

Date: 2015-12-17; view: 2088