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4.8.2 A helicoptcr intended to be operated at flight
altitudes at which the atmosphe~ic pressurc is lcss than
700 hPa but which is provided with means of maintaining
pressures greater than 700 hPa in personnel compartments
shall be providcd with oxygen storage and dispensing
apparatus capable of storing and dispensing the oxygen
supplies required in 2.3.8.2.
4.8.3 A helicopter intended to be operated at flight
altitudes at which the atmospheric pressure is more than
376 hPa which cannot descend safely within four minutes to a
flight altitudc at which the atmospheric pressure is equal to
620hPa, and for which the individual certificate of
airworthiness was issued on or after 9 Novcmber 1998, shall
be provided with autoinatically deployable oxygen equipment
to satisfy the rcquirernents of 2.3.8.2. The total number of
oxygen dispensing units shall exceed thc number of passenger
and cabin crew seats by at least 10 per cent.
Section 12, Chapter 4 Annex 6 - Operation of Aircraft
4.8.4 Recommendation.- A helicopter intended to be
operated at flight altitudes at which the atmospheric pressure
is more than 376 hPa which cannot descend safely within four
minutes to a,flight altitude at which the atmospheric pressure
is equal to 620 hPa, and for which the individual certificate oj
airworthiness is issued before 9 November 1998, should be
provided with automatically deployable oxygen equipment to
satisfy the requirements of 2.3.8.2. The total number of oxygen
dispensing units should exceed the number of passenger and
cabin crew seats by at least 10 per cent.
4.9 All helicopters in
icing conditions
All helicopters shall be equipped with suitable anti-icing andl
or de-icing devices when operated in circumstances in which
icing conditions are reported to exist or are expected to be
encountered.
4.10 All helicopters operated
in accordance with
instrument flight rules
4.10.1 All helicopters when operated in accordance with
the instrument tlight rules, or when the helicopter cannot be
maintained in a desired attitude without reference to one or
more flight instruments, shall be equipped wjth:
h) a means of indicating whether the power supply to the
gyroscopic instrument is adequate;
i) a means of indicating in the flight crew compartment the
outside air temperature;
j) a rate of climb and descent indicator;
k) a stabilization system, unless it has been demonstrated
to the satisfaction of the certificating authority that the
helicopter possesses, by nature of its design, adequate
stability without such a system; and
1) such additional instruments or equipment as may be
prescribed by the approptiate authority.
4.10.2 All performance Class 1 and Class 2 helicopters
when operated in accordance with the instrument flight rules
shall be fitted with an emergency power supply, independent
of the main electrical generating system, for the purpose of
operating and illuminating, for a minimum period of
30 minutes, an attitude indicating instrument (artificial
horizon), clearly visible to the pilot-in-command. The
emergency power supply shall be automatically operative after
the total failure of the main electrical generating system and
clear indication shall be given on the instrument panel that the
attitude indicator(s) is being operated by emergency power.
4.11 All helicopters when
operated at night
a) a magnetic compass;
4.1 1.1 All helicopters, when operated at night shall be
b) an accurate timepiece indicating the time in hours, 'quipped with:
minutes and seconds;
a) all equipment specified in 4.10;
c) two sensitive pressure altimeters with counter drumpointer
or equivalent presentation; b) the lights required by Annex 2 for aircraft in flight or
operating on the movement area of a heliport;
Note.- Neither three-pointer nor drum-pointer
altimeters satish the requirement in 4.10.1 c).
Note.- The general characteristics of lights are
specified in Annex 8. Detailed specifications for lights
meeting the requirements of Annex 2 for aircrulft in
d) an airspeed indicating system with means of preventing flight or operating on the movement area of a heliport
malfunctioning due to either condensation or icing; are contained in the Airworthiness Manual (Doc 9760).
e) a slip indicator; c) two landing lights;
f) three attitude indicators (artificial horizon), one of d) illumination for all instruments and equipment that are
which may be replaced by a turn indicator; essential for the safe operation of the helicopter that are
used by the flight crew;
g) a heading indicator (directional gyroscope);
　
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