Mar 2017
Page 20
DATA ACQUISITION FLIGHT RECORDER Type D51615-202-XXX or D51615-
202-XXX-090 with CCU Type D51616-XXXX and CAM Type D51623-XXXX
Installation and Operating Manual with Illustrated Parts
List
Commercial in Confidence
PIM434-I
© Penny & Giles Aerospace Ltd. No part of this work may be reproduced or distributed by any means
without prior permission in writing from the copyright owner.
the power remaining present after an event. If the Record
mode has not been initiated within 10 minutes, Timed Record
terminates and the CVR subsystem enters the Idle mode.
The states of the control inputs to initiate this mode are as
follows:
STOP CVR RECORDING
- A high to low transition will
terminate recording within 10
minutes (typically 9 minutes
55 seconds) at which point it
will enter the Idle mode.
PUSH TO TEST
- High
VOICE ERASE A
- Low or open circuit
RECORD ON
- Jumper fitted
FDR INHIBIT
- Don’t Care
OR
STOP CVR RECORDING
- Low
PUSH TO TEST
- High to Low transition
VOICE ERASE A
- Low or open circuit
RECORD ON
- Jumper fitted
FDR INHIBIT
- Don’t Care
This mode is also entered upon power being applied to the
DAFR.
Audio information is digitized and sequentially written to the
crash survivable memory module in a method consistent with
the segregation and partitioning requirements of ED112 for
Cockpit Voice Recorders. An output is provided that is a
summed signal of all four input channels. Any failure in the
digitizing or storage process exceeding a continuous period of
100 milliseconds or cumulative period of 250 milliseconds will
cause the CVR FAULT output to become active. Should the
failure clear, then the CVR FAULT output will go inactive. If the
CVR FAULT output is asserted the Audio Monitor output signal
is held grounded.
Download - On Aircraft
The download - on aircraft mode allows the high-speed
recovery of all stored aircraft parameter data via the MTI.
Initiating this mode aborts any current FDR Record mode
operation for the duration of the download process.