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minutes to a flight altitude at which the atmospheric pressure
is equal to 620 hPa, and for which the individual certificate of
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 and/
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 flight rules, or when the helicopter cannot be
maintained in a desired attitude without reference to one or
more flight instruments, shall be equipped with:
a) a magnetic compass;
b) an accurate timepiece indicating the time in hours,
minutes and seconds;
c) two sensitive pressure altimeters with counter drumpointer
or equivalent presentation;
Note.— Neither three-pointer nor drum-pointer
altimeters satisfy the requirement in 4.10.1 c).
d) an airspeed indicating system with means of preventing
malfunctioning due to either condensation or icing;
e) a slip indicator;
f) three attitude indicators (artificial horizon), one of
which may be replaced by a turn indicator;
g) a heading indicator (directional gyroscope);
Note.— The requirements of 4.10.1 e), f) and g) may
be met by combinations of instruments or by integrated
flight director systems provided that the safeguards
against total failure, inherent in the separate
instruments, are retained.
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
l) such additional instruments or equipment as may be
prescribed by the appropriate 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
4.11.1 All helicopters, when operated at night shall be
equipped with:
a) all equipment specified in 4.10;
b) the lights required by Annex 2 for aircraft in flight or
operating on the movement area of a heliport;
Note.— The general characteristics of lights are
specified in Annex 8. Detailed specifications for lights
meeting the requirements of Annex 2 for aircraft in
flight or operating on the movement area of a heliport
are contained in the Airworthiness Manual (Doc 9760).
c) two landing lights;
Annex 6 — Operation of Aircraft Part III
12/31/111//0016 II-4-8
No. 11
d) illumination for all instruments and equipment that are
essential for the safe operation of the helicopter that are
used by the flight crew;
e) lights in all passenger compartments; and
f) an electric torch for each crew member station.
4.11.2 Recommendation.— One of the landing lights
should be trainable, at least in the vertical plane.
4.12 Helicopters when carrying passengers —
significant-weather detection
Recommendation.— Helicopters when carrying
passengers should be equipped with operative weather radar
or other significant-weather detection equipment whenever
such helicopters are being operated in areas where
thunderstorms or other potentially hazardous weather
conditions, regarded as detectable, may be expected to exist
along the route either at night or under instrument
meteorological conditions.
4.13 All helicopters required to comply
with the noise certification
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