Mar 2017
Page 40
© 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.
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
4.5 POWER
SUPPLY
The DAFR is designed to operate from a 28VDC supply.
The DAFR should be powered from the aircraft bus which
provides maximum reliability for the operation of the DAFR
without jeopardizing services to essential or emergency loads.
See EUROCAE ED 112 for further guidance.
For d.c. powered installations, the supply to the DAFR should
be protected by a 5 Amp circuit breaker. The type of circuit
breaker used together with any other protection devices must
be capable of passing an inrush current of 30 Amps for 2
milliseconds without tripping.
4.6 TERMINATION OF RECORDING
Some Operational Rules require a means of automatically
terminating the recording and erasure functions within 10
minutes of an event, such as all engines stopped or safe
landing. A built-in timer is provided for this purpose. A
ground on pin 24 of the rear panel connector (STOP CVR
RECORDING) will stop any recording and erasure within 10
minutes. This may be achieved by wiring pin 24 to ground via
appropriate switches.
Previously, inertia (‘g’) switches have been used to terminate
the CVR recording in the event of an accident. Due to cases
of inadvertent operation, ED112 strongly discourages the use
of such items.
For helicopters that operate over water, a device to terminate
recording in the event of ditching may be mandated. This
may be implemented by including a float switch in the power
feed to the DAFR.
4.7 START OF RECORDING
Recording will automatically start on the application of power
to the DAFR. If pin 24 (Stop CVR Recording) is held at ground
potential (e.g. by engine oil pressure switch) recording will
stop within 10 minutes. Recording will restart if one of the
following actions is taken:
A.
Momentarily remove the ground from pin 24 (Stop CVR
Recording).