744 icing detection x actual icing condition
Thread Starter
Joined: Mar 2003
Posts: 128
Likes: 1
From: Europe
744 icing detection x actual icing condition
Hi,
Have a question concerning 747 A/I operation:
Scenario
- EICAS alert message: >NO ICING
However ...
- TAT is inside 10ºC to -40ºC range, there is visible moisture, etc.
Should nacelle anti-ice be on or off?
Thanks.
Have a question concerning 747 A/I operation:
Scenario
- EICAS alert message: >NO ICING
However ...
- TAT is inside 10ºC to -40ºC range, there is visible moisture, etc.
Should nacelle anti-ice be on or off?
Thanks.
Joined: May 2000
Posts: 3,204
Likes: 2
From: Seattle
In descent, ON.
In climb or cruise, AUTO if available. ON if Auto not available; also a good option especially if you can't see the nacelle to check visually (cloud is too dense and/or wing lights don't work).
In climb or cruise, AUTO if available. ON if Auto not available; also a good option especially if you can't see the nacelle to check visually (cloud is too dense and/or wing lights don't work).
Joined: Jul 2008
Posts: 642
Likes: 203
From: Brisbane
I agree on descent, in this case with visible moisture, leave it on. EICAS will prompt ' >ANTI-ICE' if TAT greater than 12C. I've had that ' >NO ICING' flick on and off many times when still technically in the range.
