Maximum distance from an adequate aerodrome

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Last Updated
22-Mar-2009

Maximum distance from an adequate aerodrome for two-engined aeroplanes without an ETOPS approval

What does the rule say?

Private operation

Consult the Airplane Flight Manual (AFM) of the respective aircraft type.

Commercial Operation (You are holding a valid Aircraft Operator Certificate - AOC) according EU-OPS 1

OPS 1.245

Maximum distance from an adequate aerodrome for two-engined aeroplanes without an ETOPS approval

(See OPS 1.192)

1. Unless specifically approved by the Authority in accordance with OPS 1.246 (a) (ETOPS approval), an operator shall not operate a two-engined aeroplane over a route which contains a point further from an adequate aerodrome (under standard conditions in still air) than, in the case of:
   1. Performance Class A aeroplanes with either:
      1. a maximum approved passenger seating configuration of 20 or more; or
      2. a maximum take-off mass of 45 360 kg or more,
         the distance flown in 60 minutes at the one-engine-inoperative cruise speed determined in accordance with sub-paragraph (b) below;
   2. Performance Class A aeroplanes with:
      1. a maximum approved passenger seating configuration of 19 or less; and
      2. a maximum take-off mass less than 45 360 kg,
         the distance flown in 120 minutes or, if approved by the Authority, up to 180 minutes for turbo-jet aeroplanes,
         at the one-engine-inoperative cruise speed determined in accordance with subparagraph (b) below;
   3. Performance Class B or C aeroplanes:
      1. The distance flown in 120 minutes at the one-engine-inoperative cruise speed determined in accordance with subparagraph (b) below; or
      2. 300 nautical miles, whichever is less.
2. An operator shall determine a speed for the calculation of the maximum distance to an adequate aerodrome for each two-engined aeroplane type or variant operated, not exceeding VMO, based upon the true airspeed that the aeroplane can maintain with one-engine-inoperative.
3. An operator must ensure that the following data, specific to each type or variant, is included in the Operations Manual:
   1. the one-engine-inoperative cruise speed determined in accordance with subparagraph (b) above; and
   2. the maximum distance from an adequate aerodrome determined in accordance with subparagraphs (a) and (b) above.

Note: The speeds specified above are only intended to be used for establishing the maximum distance from an adequate aerodrome.

Performance Class A

OPS 1.500

En-route — One engine inoperative

1. An operator shall ensure that the one engine inoperative en-route net flight path data shown in the Aeroplane Flight Manual, appropriate to the meteorological conditions expected for the flight, complies with either subparagraph (b) or (c) at all points along the route. The net flight path must have a positive gradient at 1 500 ft above the aerodrome where the landing is assumed to be made after engine failure. In meteorological conditions requiring the operation of ice protection systems, the effect of their use on the net flight path must be taken into account.
2. The gradient of the net flight path must be positive at at least 1 000 ft above all terrain and obstructions along the route within 9,3 km (5 nm) on either side of the intended track.
3. The net flight path must permit the aeroplane to continue flight from the cruising altitude to an aerodrome where a landing can be made in accordance with OPS 1.515 or 1.520 as appropriate, the net flight path clearing vertically, by at least 2 000 ft, all terrain and obstructions along the route within 9,3 km (5 nm) on either side of the intended track in accordance with subparagraphs 1 to 4 below:
   1. the engine is assumed to fail at the most critical point along the route;
   2. account is taken of the effects of winds on the flight path;
   3. fuel jettisoning is permitted to an extent consistent with reaching the aerodrome with the required fuel reserves, if a safe procedure is used; and
   4. the aerodrome where the aeroplane is assumed to land after engine failure must meet the following criteria:
      1. the performance requirements at the expected landing mass are met; and
      2. weather reports or forecasts, or any combination thereof, and field condition reports indicate that a safe landing can be accomplished at the estimated time of landing.
4. When showing compliance with OPS 1.500, an operator must increase the width margins of subparagraphs (b) and (c) above to 18,5 km (10 nm) if the navigational accuracy does not meet the 95 % containment level.

En-route — Aeroplanes with three or more engines, two engines inoperative

What does the rule say?

Private operation

Consult the Airplane Flight Manual (AFM) of the respective aircraft type.

Commercial Operation (You are holding a valid Aircraft Operator Certificate - AOC) according EU-OPS 1

OPS 1.505

1. An operator shall ensure that at no point along the intended track will an aeroplane having three or more engines be more than 90 minutes, at the all-engines long range cruising speed at standard temperature in still air, away from an aerodrome at which the performance requirements applicable at the expected landing mass are met unless it complies with subparagraphs (b) to (f) below.
2. The two engines inoperative en-route net flight path data must permit the aeroplane to continue the flight, in the expected meteorological conditions, from the point where two engines are assumed to fail simultaneously, to an aero- drome at which it is possible to land and come to a complete stop when using the prescribed procedure for a landing with two engines inoperative. The net flight path must clear vertically, by at least 2 000 ft all terrain and obstructions along the route within 9,3 km (5 nm) on either side of the intended track. At altitudes and in meteorological condi- tions requiring ice protection systems to be operable, the effect of their use on the net flight path data must be taken into account. If the navigational accuracy does not meet the 95 % containment level, an operator must increase the width margin given above to 18,5 km (10 nm).
3. The two engines are assumed to fail at the most critical point of that portion of the route where the aeroplane is more than 90 minutes, at the all engines long range cruising speed at standard temperature in still air, away from an aero- drome at which the performance requirements applicable at the expected landing mass are met.
4. The net flight path must have a positive gradient at 1 500 ft above the aerodrome where the landing is assumed to be made after the failure of two engines.
5. Fuel jettisoning is permitted to an extent consistent with reaching the aerodrome with the required fuel reserves, if a safe procedure is used.
6. The expected mass of the aeroplane at the point where the two engines are assumed to fail must not be less than that which would include sufficient fuel to proceed to an aerodrome where the landing is assumed to be made, and to arrive there at least 1 500 ft directly over the landing area and thereafter to fly level for 15 minutes.