Page 206 - Overseas Territories Aviation Requirements Consolidated - Total AOC

Regulation OTAR Part 135 - CAT - Helicopters and Small Aeroplanes

Notwithstanding OTAR 91.265:
(a) The operator shall ensure that for any flight conducted under IFR, at least one destination
alternate aerodrome shall be selected and specified in both the operational and ATS flight plans,
unless:
(1) for aeroplanes; two separate runways, each with an operational straight-in instrument
approach procedure, are usable by the flight at the estimated time of use of the
destination aerodrome; and
(2) the duration of the flight from the departure aerodrome, or from the point of in-flight re-
planning, to the destination aerodrome is such that, taking into account all
meteorological conditions and operational information relevant to the flight at the
estimated time of use, a reasonable certainty exists that the approach and landing may
be made under visual meteorological conditions; or
(3) the aerodrome of intended landing is isolated and there is no suitable alternate
aerodrome; and
(i) a standard instrument approach procedure is prescribed for the aerodrome
of intended landing; and
(ii) a point of no return (PNR) is determined; and
(iii) the flight shall not be continued past the PNR unless a current assessment
of meteorological conditions, traffic, and other operational conditions indicate
that a safe landing can be made at the estimated time of use.

(b) Two destination alternate aerodromes shall be specified in the operational and ATS flight plans
when, at the destination aerodrome:
(1) available meteorological aerodrome reports and forecasts for the destination indicate
that the meteorological conditions at the estimated time of use will be below the
applicable minima; or
(2) meteorological information is not available.
(e) For helicopters conducting offshore operations, offshore alternates may be specified subject to
the following conditions:
(1) the offshore destination alternate shall be used only after a point of no return (PNR).
Prior to PNR on-shore destination alternates shall be used; and
(2) mechanical reliability of critical systems and critical components shall be considered
and taken into account when determining the suitability of the destination alternates;
and
(3) one engine inoperative hover performance capability shall be attainable prior to arrival
at the destination alternate; and
(4) to the extent possible, helideck availability shall be guaranteed at the destination
alternate; and
(5) a landing forecast indicating the likelihood of visual meteorological conditions at the
intended offshore destination and the offshore destination alternate based upon
accredited meteorological information conforming to the standards in ICAO Annex 3,
shall be required for the decision to go beyond PNR; and
(6) an offshore destination alternate shall not be used if fog is forecast or observed within
100 km of the destination; and
(7) offshore alternates shall not be used when it is possible to carry enough fuel to have an
onshore alternate; the use of offshore alternates shall be exceptional and shall not be
used for the purposes of payload enhancement during adverse weather conditions.

OTAR.135.270 Maximum distance to an en-route alternate aerodrome for aeroplanes without an EDTO approval
(a) The operator shall ensure that no aeroplane operates on a route where diversion time from any
point on the route to an adequate en-route alternate aerodrome exceeds the threshold time
established by the Governor in relation to the type of aeroplane, unless the operation is
conducted in accordance with procedures for extended diversion time operations (EDTO)
required by paragraph 135.275.
(b) Calculations of diversion times in (a) shall assume ISA in still air conditions and use:
(1) for aeroplanes with two turbine engines, the one-engine inoperative cruise speed; and
(2) for aeroplanes with more than two turbine engines, the all-engine operating cruise
speed.
OTAR.135.270 APP1 EDTO Threshold Times
(1) For a two turbine engined aircraft:
(a) 120 minutes at the one engine-inoperative (OEI) cruise speed, or
(b) 300nm, whichever is less.

OTAR.135.275 EDTO limitations
The operator shall ensure that:
(a) an EDTO flight is not commenced unless:
(1) EDTO operations are approved by the Governor;
Overseas Territories Aviation Requirements 206 of 386