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CVR should ensure that the recorder operates correctly
2.2.2 The preferred track allocation is as follows: for the nominal duration of the recording;
Track 1 - co-pilot headphones and live boom micro- b) the analysis of the FDR should evaluate the quality of
phone the recorded data to determine if the bit error rate is
within acceptable limits and to determine the nature and
Track 2 - pilot headphones and live boom microphone
distrib~tion~othfe errors;
C) a complete flight from the ,FDR should be examined in
Track 3 - area microphone engineering units to evaluate the validity of all recorded
parameters. Particular attention should be given to
Track 4 -time reference, main rotor speed or the flight parameters from sensors dedicated to the FDR.
deck vibration environment, the third and Parameters taken from the aircraft's electrical bus
fourth crew member's headphone and live system need 'not be checked if their can be
microphone, if applicable. detected by other aircraft systems;
ATT B-2
Annex 6 - Operation of Aircmft Part ZZZ
d) the read-out facility should have the necessary software
to accurately convert the recorded values to engineering
units and to determine the status of discrete signals;
e) an annual examination of the recorded signal on the
CVR should be carried out by re-play of the CVR
recording. While installed in the aircraft the CVR should
record test signals from each aircraft source and from
relevant external sources to ensure that all required
signals meet intelligibility standards; and
f) where practicable, during the annual examination, a
sample of in-flight recordings of the CVR should be
examined for evidence that the intelligibility of the
signal is acceptable.
3.3 Flight recorder systems should be considered unserviceable
if there is a significant period of poor quality data,
unintelligible signals, or if one or more of the mandatory
parameters is not recorded correctly.
3.4 A report of the annual inspection should be made
available on request to the State's regulatory authority for
monitoring purposes.
3.5 Calibration of the FDR system:
a) the FDR system should be re-calibrated at least every
five years to determine any discrepancies in the
engineering conversion routines for the mandatory
parameters, and to ensure that parameters are being
recorded within the calibration tolerances; and
b) when the parameters of altitude and airspeed are
provided by sensors that are dedicated to the FDR
system, there should be a re-calibration performed as
recommended by the sensor manufacturer, or at least
every two years.
ATT B-3
Annex 6 - Operrrfion of Ahmp Part 111
Table B - 1
Helicopters - Parameters for Flight Data Recorders
Recording Accuracy limits
interval (sensor input compared
Measurement range (seconds) to FDR read-out)
Serial
number Parameter
1 llme (UTC when available, 24 hours
otherwise elapsed time)
4 M.1 25% per hour
-300 m (-1 000 ft) to 1 f i 0 m to k200 m
maximum certificated (f 100 ft to f700 ft)
altitude of aircraft
+1 500 m (+5 000 ft)
3 Indicated airspeed As the installed
measuring system
4 Heading 360" 1 Xi0
5 Normal acceleration -3 g to +6 g 0.125 kl%
6 Pitch attitude 175" 0.5 KiO
7 Roll attitude f 180" 0.5 So
8 Radio transmission keying On-off (one discrete) 1
9 Power on each engine Full range
(Note 1)
1 (per k2%
engine)
10 Main rotor speed 50- 130% 0.5
&2% unless higher accuracy
uniquely required.
11 Pilot input and/or control Full range
surface position-primary
controls (Collective. pitch,
longitudinal cyclic pitch,
lateral cyclic pitch, tail
rotor pedal) (Note 2)
12 Hydraulics, each system Discrete
(low pressure)
13 Outside air temperature Sensor range
14 Autopilot/auto A suitable combination of 1
throttle/AFCS discretes
mode and engagement status
15 Stability augmentation system Discrete
engagement
Note.- The preceding 15 parameters satisfy the requirements for n Type V FDR.
16 Main gearbox oil pressure As installed 1 As installed
17 Main gearbox oil temperature As installed 2 As installed
18 Yaw acceleration
(or yaw rate)
f 1.5% max range excluding datum
error of f5%
19 Sling load force 0-200%
of certified load
f3% of max range
l/l-UOl ATT B-4
Annex 6 - Operation of Aim+ Part IZI
Recording Accuracy limits
Serial interval (sensor input compared
number Parameter Measurement range (seconds) to FDR read-out)
20 Longitudinal acceleration *l g
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