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Old 09-01-2007, 11:14 AM   #1  
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Default Can anyone answer this correctly.

FAR 121 requires that a turbojet airplane be able to land in what percent of usable runway at the destination from how high? Alternate requirements are the same as destination requirements for a turbojet.

All I can find or remember is 50 feet above the approach end of the runway, speed is 1.3 times VS, and 67 percent of the runway. Is this the right answer?
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Old 09-01-2007, 11:20 AM   #2  
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I believe 60% is the correct answer. I don't have my ATP book in front of me to verify though.
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Old 09-01-2007, 11:47 AM   #3  
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Off the top of my head, I think it's 65%. And 115% of that # if it's wet.
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Old 09-01-2007, 12:36 PM   #4  
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60%, you have to take the performance hit and it has to be within 60% of the runway if the runway is contaminated.
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Old 09-01-2007, 03:02 PM   #5  
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Quote:
Originally Posted by Topper View Post
FAR 121 requires that a turbojet airplane be able to land in what percent of usable runway at the destination from how high? Alternate requirements are the same as destination requirements for a turbojet.

All I can find or remember is 50 feet above the approach end of the runway, speed is 1.3 times VS, and 67 percent of the runway. Is this the right answer?

OK, this should give you a full answer. I find it helpfull to browse through the part 121, 91, and 61 regs under which I fly. Just helps you remember where to look when you forget something. We all tend to forget things.

oh, part 23 and 25 are also good.
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.

Good Luck
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