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Re: [OM] OT: Temperature and Runway Length

Subject: Re: [OM] OT: Temperature and Runway Length
From: Chris Trask <christrask@xxxxxxxxxxxxx>
Date: Fri, 17 Jun 2016 09:45:09 -0700 (GMT-07:00)
     You could, but for commercial airline service it's not all that practical 
as you would have to triage passengers, sort out luggage, etc.  Best to just 
wait it out until after sunset.

>
>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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