73
Federal Aviation Administration, DOT
Pt. 60, App. A
5.b.8.
.............
Initial approach
...............
±
5 dB per
1
⁄
3
octave
band
...
Approach
.....................
Constant airspeed, gear up, flaps ex-
tended as appropriate, RPM as per
operating manual.
X
5.b.9.
.............
Final Approach
................
±
5 dB per
1
⁄
3
octave
band
...
Landing
........................
Constant airspeed, gear down, full flaps,
RPM as per operating manual.
X
5.c.
................
Special cases.
..................
±
5 dB per
1
⁄
3
octave band
...
As appropriate
.............
X
These special cases
are identified as par-
ticularly significant
during critical
phases of flight and
ground operations
for a specific air-
plane type or model.
5.d.
................
Background noise.
..................
±
3 dB per
1
⁄
3
octave
band
...
Results of the background noise at initial
qualification must be included in the
MQTG. Measurements must be made
with the simulation running, the sound
muted and a ‘‘dead’’ flight deck.
X
The sound in the simu-
lator will be evalu-
ated to ensure that
the background
noise does not inter-
fere with training,
testing, or checking.
5.e.
................
Frequency response.
..................
±
5 dB on three (3) consecu-
tive bands when com-
pared to initial evaluation;
and
±
2 dB when com-
paring the average of the
absolute differences be-
tween initial and con-
tinuing qualification eval-
uation.
Applicable only to Continuing Qualifica-
tion Evaluations. If frequency response
plots are provided for each channel at
the initial qualification evaluation,
these plots may be repeated at the
continuing qualification evaluation with
the following tolerances applied: (a)
The continuing qualification
1
⁄
3
octave
band amplitudes must not exceed
±
5
dB for three consecutive bands when
compared to initial results. (b) The av-
erage of the sum of the absolute dif-
ferences between initial and continuing
qualification results must not exceed 2
dB (refer to Table A2B in this attach-
ment).
X Measurements
are
compared to those
taken during initial
qualification evalua-
tion.
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