(b)
 During the first five minutes of energization of the aircraft electrical network, with both engines shut down, a ground signal is fed to the time-delay relay 10RK. The relay 10RK is supplied with 28VDC from the bus bar 801PP via the circuit breaker 4RK. When energized this relay starts its timing function. During this timing function, the relay 8RK remains de-energized and the CVR is supplied with 115VAC. After 5 minutes, a ground signal is sent via the normally-open contacts of the time-delay relay 10RK to energize the relay 8RK which cuts off the supply of 115VAC to the CVR.

 (c)
 Up to five minutes after second engine shutdown, a ground signal is sent to the time-delay relay 10RK. The relay 10RK is supplied with 28VDC from the busbar 801PP via the circuit breaker 4RK. When energized, this relay starts its timing function. During this timing function, the relay 8RK remains de-energized and the CVR is supplied with 115VAC. After 5 minutes, a ground signal is sent via the relay 10RK to energize the relay 8RK which cuts off the supply of 115VAC to the CVR.

 NOTE : In the cases described in Para. 2 (b) and (c) above, the
____ relay 6RK is de-energized (A/C on the ground) and the recording function stops.
 B. Manual Power Supply Manual selection of power supply to the SSCVR allows the functions given below with the aircraft on the ground and both engines shut down:
 -
To test the SSCVR for correct operation

 -
To record the beginning of the check list before the first engine starts running

 -
To erase CSMU information if required.

 1EFF : ALL 1 23-71-00Page 7 1 1 May 01/05R 1 1 1CES 1

 With both engines shut down, a ground signal is sent to the relay 12TU.
 Pushing the RCDR/GND CTL pushbutton switch 11TU supplies the 28VDC to the
 relay 12TU via the normally-open contacts of the pushbutton switch 11TU
 and the normally-closed contacts of the relay 13 TU.
 The relay 12TU is energized. A ground signal is sent to the blue ON
 legend which comes on.
 A ground signal is also sent to the relay 6RK which energizes and
 supplies the SSCVR with 115VAC power.
 When the RCDR/GND CTL pushbutton switch is released, the 28VDC is applied
 via relay 12TU and pushbutton switch 11TU to the relay 13TU which is
 energized.
 If one engine is started, the ground signal to relay 12TU is removed and
 the relay 12TU is de-energized.
 Thus the blue ON legend goes off and the relay 6RK is de-energized.

 5.
 Interface

_________
 Ref. Para. System Description

 6.
 Component Location

__________________
 A. CVR Microphone Amplifier 18RK
 **ON A/C 062-099,
 (Ref. Fig. 004)
 **ON A/C ALL
 The CVR Microphone amplifier is attached behind the overhead panel.
 Two electrical connectors are provided at the back for connection with
 the CVR and the remote microphone.
 Inside is the microphone pre-amplifier which is supplied with 18VDC from
 the Cockpit Voice Recorder.

 B. CVR Microphone 16RK
R **ON A/C 062-099, 106-149, 214-299, 301-399, 401-499,
 (Ref. Fig. 005)
 **ON A/C ALL
 The remote microphone is installed at the bottom of the overhead panel.
 1EFF : ALL 1 23-71-00Page 8 1 1 Aug 01/05 1 1 1CES 1R Cockpit Voice recorder - Microphone Amplifier R Figure 004

R 1EFF : 062-099, 1 23-71-00Page 9 1 1 May 01/05 1 1 1CES 1

 Cockpit Voice Recorder - Area Microphone
 Figure 005

R 1EFF : 062-099, 106-149, 214-299, 301-399, 1 23-71-00Page 10 1401-499, 1Aug 01/05 1 1 1CES 1 It is a condenser type microphone.

 C. Solid State Cockpit Voice Recorder (CVR) 1RK

R **ON A/C 001-049, 062-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 006)
 **ON A/C 051-061,
 (Ref. Fig. 006A)
 **ON A/C ALL
 The SSCVR is located in the aft section of the aircraft. It is attached to a shockmount by means of two locking tabs.
 (1)
 On the face:
 (Ref. Fig. 007)

 (a)
 An Underwater Locator Beacon (ULB) is mounted on a bracket attached to the recorder. The ULB is a battery-operated device which radiates a pulsed acoustic signal into the surrounding water upon activation of its water-sensitive switch. It consists of a self-contained battery, an electronic module and a transducer. The battery is shock-mounted and separated from the electronic module by a bulkhead built into the case; it is accessible by removal of the end cover which is sealed with an O-ring. Located on the opposite end of the ULB is a teflon-insulated water-sensitive switch.
　
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