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Re: [OM] OT: Temperature and Runway Length

Subject: Re: [OM] OT: Temperature and Runway Length
From: Jim Nichols <jhnichols@xxxxxxxxxxxxx>
Date: Fri, 17 Jun 2016 11:36:19 -0500
With 11,489 ft of runway, it would seem that passenger load could be limited to continue service.

Jim Nichols
Tullahoma, TN USA

On 6/17/2016 11:21 AM, Chris Trask wrote:
      The topic has come into the news here of the possibility of takeoffs at 
Sky Harbor being suspended this weekend due to the forecast high temperatures.  
This happened back in 1990, and the news people stated that it was because the 
takeoff data charts did not go high enough in temperature.  Actually, that's 
just part of the real story.

      In multi-engine aircraft, there are terms like "refusal speed", "critical engine failure 
speed", and "critical field length".  It's this last one that comes into play here.

      Refusal speed (Vr) is the maximum allowable speed that can be attained 
with normal acceleration, from which a stop may be completed within the 
available runway length 
(http://www.flashcardmachine.com/told-definitions1.html).

      Critical engine failure speed is defined as the speed at which one engine 
can fail and the same distance is required to either continue to accelerate to 
lift-off speed, or abort and decelerate to a full stop.

      Critical field length is the total length of the runway required to 
accelerate on all engines to critical engine failure speed, experience an 
engine failure, then continue to lift-off or stop.

      Now comes the fun part.  Category 1 is the situation where the available 
runway is greater than the critical field length, which is typical.  Category 2 
is where the available runway and the critical field length are the same.  
Category 3 is where the available runway is less than the critical field 
length.  You are not allowed to takeoff in category 3 situations.  Period.

      Back in 1990 most airlines operating out of Sky Harbor were using the 
fairly new 737-400.  Now we have the 737=800 as well as other comparable 
aircraft.  It remains to be seen how our extreme tempratures this weekend will 
affect operations.



Chris

When the going gets weird, the weird turn pro
      - Hunter S. Thompson

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