When calculating the driftdown flight path with one engine inoperative, which of the following conditions are considered?
1. Flight director mode
2. Pressure Altitude
3. Mass at the start of driftdown
4. Mass at the end of driftdown
5. Ouside air temperature
6. Engine (critical engine or not)
CS 25.123 En-route flight paths
(a) For the en-route configuration, the flight paths prescribed in sub-paragraphs (b) and (c) of this paragraph must be determined at each weight, altitude, and ambient temperature, within the operating limits established for the aeroplane. The variation of weight along the flight path, accounting for the progressive consumption of fuel and oil by the operating engines, may be included in the computation.
(a) For the en-route configuration, the flight paths prescribed in sub-paragraphs (b) and (c) of this paragraph must be determined at each weight, altitude, and ambient temperature, within the operating limits established for the aeroplane. The variation of weight along the flight path, accounting for the progressive consumption of fuel and oil by the operating engines, may be included in the computation.
- The en-route flight path will be affected by the factors which influence the aircraft's performance: aircraft's mass at the time of engine failure, ambient air temperature and pressure altitude.
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