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Thread: Single Pack operation B737 NG
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Old 6th Dec 2021, 20:12
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Dukeunlimited
 
Join Date: Apr 2008
Location: Australia
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I don't fly the B737, but this MEL requirement applies to other jet types I have flown.

I believe the rationale is as follows:

Should you lose a pack enroute, the remaining pack will provide adequate flow for pressurisation (at FL350 etc). You may not have the additional fuel for cruise at FL250.

After arriving at your destination and applying the MEL, from then on your sectors will be planned, and fuel carried for, cruise at or below FL250. This limitation is in place for safety should your aircraft lose the remaining pack.

I hope that helps,

Duke.
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