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Limitations question

JoeMhama

INOP
Joined
Feb 7, 2005
Posts
57
Total Time
2800
For 737/757 drivers:

Why is it that at -40C or below, in climb or cruise condition, engine anti-ice must be turned off, but during descent at those temps it can be left on?

Thanks
 

Floyd R. Turbo

Well-known member
Joined
Feb 23, 2005
Posts
101
Total Time
6500+
One pilot's elementary explanation: It's turned off below -40C because ice won't stick in temperatures below that. It's turned back on during descent because if you are in -40 air and you are descending, you probably won't be in -40 air for long. Better to get it on a little early rather than a little late.
 

pilotmiketx

Registerd User
Joined
Jul 13, 2003
Posts
345
Total Time
oodles
It's not just the 757. The jets that I've flown have the same limitations: Wing and Engine anti-ice on in visible moisture between +10 and -40C or with an Ice Detected CAS. Plus there's some other times on slushy runways, etc. And for the reason mentioned above.
 

Squid@.92

Member
Joined
Oct 11, 2005
Posts
7
Total Time
XXXXX
Also, It's "free" insurance in a decent. Your not gonna lose any performance like you would in a climb by turning it on.
 
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