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Old 29th December 2020 | 12:24
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FlyingStone
 
Joined: Apr 2010
Posts: 1,320
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From: IRS NAV ONLY
Most aircraft have an environmental envelope published in their AFM, for the B737NG the lower limit is -73.5C from FL360 and above.

Pretty sure somebody else can elaborate on why exactly it is needed.
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