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substituted with due regard to the helicopter type and the
characteristics of the recording equipment.
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 FDR:
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 reports.
1.3.3 Documentation concerning pararheter allocation,
conversion equations, periodic calibration and other
serviceability/maintenance information should be maintaiaed
by the operator. The documentation must be sufficient to
ensure that accident investigation authorities have the
necessary information to read out the data in engineering units.
2. Cockpit voice recorder (CYR)
2.1 General requirements
2.1.1 The CVR is to be designed so that it will record at
least the following:
a) voice communication transmitted from or received in
the aircraft by radio;
b) aural environment on the flight deck;
C) voice communication of flight crew menibers on the
flight deck using the interphone system;
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 installed; and
ANNEX 6 - PART 111 AT'l' B-1 l/lllnl
Annex 6 - Opemtion of AIrcmj3 Part ZZZ
fj digital communications with ATS, unless recorded by Note 1.- Track 1 is located closest to the base of the
the FDR. recording head.
2.1.2 The CVR 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 automatically activated
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 co-pilot stations and voice communications of other
crew members on the flight deck when directed to those
Note 2.- The preferred track allocation presumes use of
current conventional magnetic tape transport mechanisms,
and is specfled because the outer edges of the tape have a
higher risk of damage than the middle. It is not intended to
preclude use of altermtive recording media where such
constraints may nor apply.
2.2.3 The CVR, 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 FDR and CVR.
stations. This can best be achieved by wiring suitable boom
microphones to record continuously on separate channels. Note.- One method of achieving this is by superimposing
the FDR time signal on the CVR.
2.1.4 The CVR is to be installed so that:
a) the probability of damage to the recording is minimized; 2.3 Additional information
b) it receives its electrical power from a bus that provides The manufacturer usually provides the national certificating
the maximum reliability for operation of the CVR authority with the following information in respect of the
without jeopardizing service to essential or emergency CVR:
loads; a) manufacturer's operating instructions, equipment
limitations and installation procedures; and
C) there is an aural or visual means for pre-flight checking
of the CVR for proper operation; and b) manufacturer's test reports.
d) if the CVR has a bulk erasure device, the installation
should be designed to prevent operation of the device
during flight time or crash impact. 3. Inspections of FDR and CVR systems
3.1 Prior to the first flight of the day the built-in test
2.2 Performance requirements features on the flight deck for the CVR, FDR and Flight Data
Acquisition Unit (FDAU), when installed, should be
2.2.1 The CVR will be capable of recording on at least monitored.
four tracks simultaneously. To ensure accurate time correlation
between tracks, the CVR is to record in an in-line format. If a 3.2 Annual inspections should be carried out as follows:
bi-directional configuration is used, the in-line format and
track allocation should be retained in both directions. a) the read-out of the recorded data gram the FDR and
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