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1.3 Additional information
1.3.1 The measurement range, recording interval and
accuracy of parameters on installed equipment is usually
verified by methods approved by the appropriate certificating
authority.
1.3.2 The manufacturer usually provides the national
certificating authority with the following information in
respect of the flight data recorder:
a) manufacturer's operating instructions, equipment
limitations and installation procedures;
b) parameter origin or source and equations which relate
counts to units of measurement; and
C) manufacturer's test repom.
1.3.3 The operator usually supplies position error curves
for pitot-static parameters, at various angles of attack and side
slip, for the calibration and read-out of the recordings.
2. Cockpit voice recorder (CVR)
2.1 General requirements
2.1.1 The recorder is to be designed so that it will record
at least the following:
a) voice communication transmitted from or received in
the aeroplane by radio;
b) aural environment on the flight deck;
c) voice communication of flight crew members on the
flight deck using the aeroplane's interphone system;
ANNEX 6 - PART I1 25 5/11/98
Annex 6 - Operation ofAircruft part 11
d) voice or audio signals identifying navigation or
approach aids introduced in the headset or speaker;
e) voice communication of flight crew members using the
passenger address system, if insta1tl)ed; and
f) digital communications with ATS, unless recorded by
the flight data recorder.
2.1.2 The recorder container is to:
a) be painted a distinctive orange or yellow colour;
b) carry reflective material to facilitate its location: and
C) have securely attached an automarically ac~ivated
underwater locating device.
2.1.3 To aid in voice and sound discrimination, microphones
in the cockpit are to be located in the best position for
recording voice communications originating at the pilot and
cu-pilot stations and voice communications of other crew
members on the flight deck when directed to those stations.
This can best be achieved by wiring suitable boom microphones
to record continuously on separate channels.
2.1.4 The recorder is to be installed so that:
a) the probability of damage to the recording is minimized.
To meet ths requirement it should be located as far aft
as practicable. In the case of pressurized aeroplanes it
should be located in the vicinity of the rear pressure
bulkhead:
b) it receives its electrical power from a bus that provides
the maximum reliability for operation of the recorder
without jeopardizing service to essential or emergency
loads:
C) there is an aural or visual means for pre-flight checking
of the recorder for proper operation; and
d) if the recorder has a bulk erasure device, the installation
should be designed to prevent operation of the device
during flight time or crash impact.
2.2 Performance requirements
2.2.1 The recorder will be capable of recording on at least
four tracks simultaneously, To ensure accurate time correlation
between tracks, the recorder is to record in an in-line format.
If a bi-directional configuration is used, the in-line format and
track allocation should be retained in both directions.
Track 2 - pilot headphones and live haom microphone
Track 3 - area microphone
Track 4 - time reference plus the third and fourth crew
member's headphone and live microphone. if
applicable.
Norc 1.- Track 1 is located closest to the base of the
recording head.
Note 2.- The preferred track allocurion presumes use of
current conventional magnetic tape transport mechanisms, and
is specijied because the ourer edges of the tape have a higher
risk of damage than the middle. It is not intended to preclude
we ofalremtive mcording media whem such constraints may
not apply.
2.2.3 The recorder, when tested by methods approved by
the appropriate certificating authority, will be demonstrated to
be suitable for the environmental extremes over which it is
designed to operate.
2.2.4 Means will be provided for an accurate time
correlation between the flight data recorder and the cockpit
voice recorder.
Nore.- One method of achieving rhis is by superimposing
the FDR time signul on rhe CVR.
2.3 Additional information
2.3.1 The manufacturer usually provides the national
certificating authority with the following information in
respect of the cockpit voice recorder:
a) manufacturer's operating instructjons, equipment
limitations and installation procedures; and
b) manufacturer's test reports.
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