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area may be less than 0.125D and that the length of the inner edge of the
surveyed area may be less than 300 feet.
12.3.2 The requirements mentioned in paragraph 12.1 are met for a part of the takeoff
area if the gradient of the net flight path in that part is not less than the
obstacle-clear take-off gradient.
12.3.3 The obstacle-clear take-off gradient is taken to be zero at the height of the
highest obstacle within the take-off area.
-11- SECTION 20.7.1B
Issue 5
Issue 5: 11 June 2005
Amendment No. 227
12.4 For the purposes of subparagraph 4.1 (c), and subject to paragraph 12.5, the
en-route obstacle clearance requirements are met if, in the en-route
configuration with the critical engine inoperative the net flight path of an
aeroplane under V.M.C. clears by 1 000 feet vertically all obstacles within 5
nautical miles of the aeroplane’s track or, under I.M.C., by such greater
distance as is determined by the accuracy of the navigation aid(s) used. At the
pressure altitude required to achieve this clearance of the critical en-route
obstacles the net flight path must have a positive slope.
12.5 If compliance with paragraph 12.4 is not possible, a “drift down” procedure
may be planned. For this purpose it must be established that, following failure
of the critical engine at any point during climb or cruise, a net flight path from
that point to a suitable aerodrome will clear, by 2 000 feet vertically, all
obstacles within 5 miles laterally of the aeroplane’s track under V.M.C. or, in
the case of I.M.C., obstacles within such greater lateral distance from the
aeroplane’s track as is determined by the accuracy of the navigation aid(s)
used.
12.6 The net flight path in the en-route configuration must have a positive slope at
1 500 feet above the aerodrome where a landing is assumed to be made
following engine failure. If the aeroplane is to be landed at other than the
destination or alternate aerodrome following an engine failure that aerodrome
must be specified in the operational flight plan and be suitable for landing.
12.7 The following factors must be taken into account when determining the net
flight path in the en-route configuration:
(a) the effect of wind;
(b) temperature (forecast temperature may be used in the determination of enroute
net flight paths);
(c) pressure altitude;
(d) fuel and oil consumption;
(e) fuel jettisoning — in accordance with an approved procedure, consistent
with reaching an aerodrome;
(f) the effect of ice protection systems when anticipated weather conditions
along the route indicate possibility of icing conditions.
12A ALTERNATIVE TAKE-OFF AREA REQUIREMENTS
12A.2 Subject to paragraphs 12A.3, 12A.4 and 12A.5, the take-off area consists of the
area on either side of the planned flight path within a lateral distance calculated
using the formula:
90 metres + 0.125D
where D is the distance measured horizontally along the planned flight path
and commencing from the end of the take-off distance available.
SECTION 20.7.1B -12-
Issue 5
Issue 5: 11 June 2005
Amendment No. 227
12A.3 Obstacles at a distance greater than 600 metres on either side of the planned
flight path need not be cleared:
(a) if the planned flight path does not include a change of heading of more
than 15o; or
(b) in the case of operations conducted in V.M.C. by day.
12A.4 If paragraph 12A.3 does not apply, obstacles at a distance greater than 900
metres on either side of the planned flight path need not be cleared.
12A.5 Despite paragraphs 12A.3 and 12A.4, for an RNP-capable aeroplane engaged
in an approved RNP operation, the lateral expansion of the take-off area may
be discontinued when the take-off area intersects the RNP containment
specified in the approval as appropriate for the RNP type that is:
(a) selected in the FMS by the flight crew; and
(b) within the RNP capability specified in the flight manual for an operation
of that kind.
14 AEROPLANE CONFIGURATION AND PROCEDURES
14.1 Paragraph 14.1A applies if:
(a) the manufacturer of, or the holder of the type certificate for, an aeroplane
has published advice, recommendations or guidance (the information)
about the performance of the aeroplane in an emergency, unusual
operating conditions or an abnormal configuration; and
(b) the aeroplane is in the emergency, conditions or configuration.
14.1A The pilot in command of the aeroplane must take the information into account
when planning the take-off or landing of the aeroplane.
14.1B In subparagraph 14.1 (a), type certificate includes foreign type certificate
within the meaning of paragraph 21.041 (1) of the Civil Aviation Safety
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