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(a)
Relay 6RK In FLIGHT configuration, a ground signal energizes the relay 6RK which supplies the CVR with 115VAC power through its normally-open contacts. In GROUND configuration, the relay 6RK is normally de-energized. However it can be energized through the relays 12TU, 13TU and the RCDR/GND CTL pushbutton switch 11TU for test facility and manual operation.
(b)
Relay 8RK It is normally de-energized when at least one engine is running. Energizing of this relay is controlled by the time-delay relay 10RK.
(c)
Relay 10RK It is a time-delay relay which energizes after 5 minutes continuous application of a ground signal. Since the function of this relay is to control the relay 8RK, the power supply to the CVR will remain ON for 5 minutes after the second engine is shut down.
(d)
Relay 14RK This relay is energized when the parking brake is applied. Its normally-open contacts are used to control the erasure of the recorder data from the CSMU and the transition of the test signal towards the loud speakers.
(e)
Relays 12TU and 13TU, and RCDR/GND CTL pushbutton switch 11TU They control the manual function of the CVR. The system can only be operated manually when the aircraft is on the ground and both engines are shut down. When the RCDR/GND CTL pushbutton switch 11TU is pushed, the ON legend comes on blue indicating that the CVR is operating. This manual selection is automatically de-activated when one engine is started, and the CVR continues to operate in the automatic mode. It is also de-activated when the power supply is cut off and when the RCDR/GND CTL pushbutton switch is pushed again. In all cases the ON legend goes off.
NOTE : There is no indication of CVR function when operating in
____
the automatic mode.
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(f) Relay 20RK
This relay is energized as long as the RCDR/CVR TEST pushbutton
switch is pushed. Its contacts are used to control the transition
of the test signal towards the loud speakers.
R **ON A/C 062-099,
R (a) Relay 6RK
R In FLIGHT configuration, a ground signal energizes the relay 6RK
R which supplies the CVR with 115VAC power through its
R normally-open contacts.
R In GROUND configuration, the relay 6RK is normally de-energized.
R However it can be energized through the relays 12TU, 13TU and the
R RCDR/GND CTL pushbutton switch 11TU for test facility and manual
R operation.
R (b) Relay 8RK
R It is normally de-energized when at least one engine is running.
R Energizing of this relay is controlled by the time-delay relay
R 10RK.
R (c) Relay 10RK
R It is a time-delay relay which energizes after 5 minutes
R continuous application of a ground signal. Since the function of
R this relay is to control the relay 8RK, the power supply to the
R CVR will remain ON for 5 minutes after the second engine is shut
R down.
R (d) Relay 14RK
R This relay is energized when the parking brake is applied. Its
R normally-open contacts are used to control the erasure of the
R recorder data from the FCSSU and the transition of the test
R signal towards the loud speakers.
R (e) Relays 12TU and 13TU, and RCDR/GND CTL pushbutton switch 11TU
R They control the manual function of the CVR.
R The system can only be operated manually when the aircraft is on
R the ground and both engines are shut down.
R When the RCDR/GND CTL pushbutton switch 11TU is pushed, the ON
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