Part 121 (Australian Air Transport Operations—Larger Aeroplanes) Manual of Standards 2020
Division 4Requirements for conduct of EDTO
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Division 4—Requirements for conduct of EDTO
2.15 Scope of Division 4, Chapter 2
This Division: (a) is made for paragraph 121.035(3)(a) of CASR; and (b) prescribes requirements in relation to conducting EDTO flights.
2.16 Flight planning limitations for all EDTO flights
(1) A flight plan route for an aeroplane used to conduct an EDTO flight must be limited to that for which the diversion time to an EDTO en‑route alternate aerodrome for the flight, measured at the speed mentioned in subsection (2), does not exceed the maximum diversion time, in ISA and still air conditions. (2) For subsection (1), the speed is: (a) if the aeroplane is a 2‑engine aeroplane—a one‑engine-inoperative cruising speed specified in the operator’s exposition for this section; or (b) if the aeroplane is a 3‑ or 4‑engine aeroplane—a normal cruising speed, specified in the operator’s exposition for this section.
Note: An EDTO flight may also be further limited by a provision applying under section 2.17.
2.17 Additional flight planning limitations—EDTO beyond 180 minutes
(1) The requirements in this section apply in relation to an EDTO beyond a maximum diversion time of 180 minutes. Limits of cargo fire suppression system—all aeroplanes
(2) The time required by an aeroplane to fly the distance to a planned EDTO en‑route alternate aerodrome:
(a) at the normal cruising speed specified in the operator’s exposition for this section; and
(b) correcting for forecast wind and temperature;
must not exceed the time specified for the aeroplane’s cargo fire suppression system in one of the documents for the aeroplane mentioned in subsection 2.03(2), minus 15 minutes.