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4.3 Two engines inoperative
4.3.1 Aeroplanes which do not comply with 4.1 comply
with 4.3.1.1.
4.3.1.1 No aeroplane is taken off at a mass in excess of
that which according to the two-engines-inoperative en-route
net flight path data shown in the flight manual, permits the
aeroplane to continue flight from the point where two engines
are assumed to fail simultaneously, to an aerodrome at which
the landing distance specification for alternate aerodromes (see
5.2) is complied with and where it is expected that a safe
landing can be made. The net flight path clears vertically, by
at least 600 m (2 000 ft) all terrain and obstructions along the
route within 9.3 km (5 NM) on either side of the intended
track. The net flight path considered is for the ambient
temperatures anticipated along the route. In altitudes and
meteorological conditions where icing protection systems are
to be operable, the effect of their use on the net flight path data
is taken into account. The provisions of 4.3.1.1.1 to 4.3.1.1.5
inclusive apply.
4.3.1.1.1 The two engines are assumed to fail at the most
critical point of that portion of the route where the aeroplane
is at more than 90 minutes at normal cruising speed away from
an aerodrome at which the landing distance specification for
altemate aerodromes (see 5.2) is complied with and where it is
expected that a safe landing can be made.
4.3.1.1.2 The net flight path has a positive slope at 450 m
(1 500 ft) above the aerodrome where the landing is assumed
to be made after the failure of two engines.
4.3.1.1.3 Fuel jettisoning is permitted to an extent
consistent with 4.3.1.1.4, if a safe procedure is used.
4.3.1.1.4 The aeroplane mass at the point where the two
engines are assumed to fail is considered to be not less than
that which would include sufficient fuel to proceed to the
aerodrome and to arrive there at an altitude of at least 450 m
(1 500 ft) directly over the landing area and thereafter to fly
for 15 minutes at cruise power and/or thrust.
4.3.1.1.5 The consumption of fuel and oil after the
engines become inoperative is that which is accounted for in
the net flight path data shown in the flight manual.
5. Landing limitations
5.1 Aerodrome of destination
5.1.1 No aeroplane is taken off at a mass in excess of that
which, in accordance with the landing distances required as
shown in the flight manual for the altitude of the aerodrome of
intended destination, permits the aeroplane to be brought to
rest at the aerodrome of intended destination within the
effective length of the runway, this length being as declared by
the aerodrome authorities with regard to the obstructions in the
approach. The mass of the aeroplane is assumed to be reduced
by the mass of the fuel and oil expected to be consumed in
flight to the aerodrome of intended destination. Compliance is
shown with 5.1.1.3 and with either 5.1 .I .4 or 5.1.1.5.
ATT C-19 l/llml
Annex 6 - Operation of Aircraft
5.1.1.1 The runway slope is assumed to be zero, unless
the runway is usable in only one direction.
5.1.1.2 A runway condition (wet or dry) not more
favourable than that expected is taken into account.
ground handling characteristics of the aeroplane, and of other
conditions (i.e. landing aids, terrain, etc.).
5.1.1.5 If full compliance with 5.1.1.4 is not shown, the
aeroplane may be taken off if a destination alternate
aerodrome is designated which permits compliance with 5.2.
Note.- National authorities will need to develop suitable
methods for dealing with accountability for wet and dry
runways.
5.2 Destination alternate aerodrome
5.1.1.3 It is assumed that the aeroplane is landed on the
most favourable runway and in the most favourable direction
in still air.
5.1.1.4 It is assumed that the aeroplane is landed on the
runway which is the most suitable for the wind conditions
anticipated at the aerodrome at the time of landing, taking due
account of the probable wind speed and direction, of the
No aerodrome is designated as a destination alternate
aerodrome unless the aeroplane, at the mass anticipated at the
time of arrival at such aerodrome, can comply with 5.1, in
accordance with the landing distance required as shown in the
flight manual for the altitude of the alternate aerodrome and in
accordance with other applicable operating requirements for
the alternate aerodrome.
ATT C-20
ATTACHMENT D. FLIGHT RECORDERS
Supplementary to Chapter 6, 6.3
Introduction
The material in this Attachment concerns flight recorders
intended for installation in aeroplanes engaged in international
　
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