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121 Turboprob Landing Limitations
I'm reading 121.195 and trying to understand one of the sections.
Sec. 121.195 — Airplanes: Turbine engine powered: Landing limitations: Destination airports. (a) No person operating a turbine engine powered airplane may take off that airplane at such a weight that (allowing for normal consumption of fuel and oil in flight to the destination or alternate airport) the weight of the airplane on arrival would exceed the landing weight set forth in the Airplane Flight Manual for the elevation of the destination or alternate airport and the ambient temperature anticipated at the time of landing. (b) Except as provided in paragraph (c), (d), or (e) of this section, no person operating a turbine engine powered airplane may take off that airplane unless its weight on arrival, allowing for normal consumption of fuel and oil in flight (in accordance with the landing distance set forth in the Airplane Flight Manual for the elevation of the destination airport and the wind conditions anticipated there at the time of landing), would allow a full stop landing at the intended destination airport within 60 percent of the effective length of each runway described below from a point 50 feet above the intersection of the obstruction clearance plane and the runway. For the purpose of determining the allowable landing weight at the destination airport the following is assumed: (1) The airplane is landed on the most favorable runway and in the most favorable direction, in still air. (2) The airplane is landed on the most suitable runway considering the probable wind velocity and direction and the ground handling characteristics of the airplane, and considering other conditions such as landing aids and terrain. (c) A turbopropeller powered airplane that would be prohibited from being taken off because it could not meet the requirements of paragraph (b)(2) of this section, may be taken off if an alternate airport is specified that meets all the requirements of this section except that the airplane can accomplish a full stop landing within 70 percent of the effective length of the runway. (d) Unless, based on a showing of actual operating landing techniques on wet runways, a shorter landing distance (but never less than that required by paragraph (b) of this section) has been approved for a specific type and model airplane and included in the Airplane Flight Manual, no person may takeoff a turbojet powered airplane when the appropriate weather reports and forecasts, or a combination thereof, indicate that the runways at the destination airport may be wet or slippery at the estimated time of arrival unless the effective runway length at the destination airport is at least 115 percent of the runway length required under paragraph (b) of this section. (e) A turbojet powered airplane that would be prohibited from being taken off because it could not meet the requirements of paragraph (b)(2) of this section may be taken off if an alternate airport is specified that meets all the requirements of paragraph (b) of this section. Must the aircraft be able to land within 70% of the runway length at the alternate or at the destination? It can either be interpreted that the aircraft must be able to land within 60% at the alternate if this reg is used and 70% at the destination or that it must land within 70% at the alternate and that it must land just within the full runway length at the destination. Thanks for any help |
Ill keep it simple,
If you cant land within 60 percent of the runway available at the destination then you need an alternate. You MUST be able to land within 70 percent of the runway at the alternate. Once you have the alternate you can plan for using up to 80 percent of the runway at the destination. The alternate just provides you a 20 percent relief from the 60 percent rule. This is just one of the reasons one would require an alternate in 121 operations. 1 No instrument app. at destination 2. Supplemental Ops. (charter) 3. 123 rule 4. 60/70 rule. see above. |
Originally Posted by ovrtake92
(Post 898244)
Ill keep it simple,
If you cant land within 60 percent of the runway available at the destination then you need an alternate. You MUST be able to land within 70 percent of the runway at the alternate. Once you have the alternate you can plan for using up to 80 percent of the runway at the destination. The alternate just provides you a 20 percent relief from the 60 percent rule. This is just one of the reasons one would require an alternate in 121 operations. 1 No instrument app. at destination 2. Supplemental Ops. (charter) 3. 123 rule 4. 60/70 rule. see above. |
yeah Its been a while since my 121 days so I cant remember if the 80 percent was company ops specs or regulatory. It might be 100 percent at destination with alternate but youll have to dig a little further for that. I fly part 91 now and am still trying to forget all that stuff
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