COLD WEATHER OPERATION B737NG ANTI-ICE OPERATION
Icing conditions exist when OAT (on the ground) or TAT (in flight) is 10°C or below and any of the following exist:
- visible moisture (clouds, fog with visibility of one statute mile (1600m) or less, rain, snow, sleet, ice crystals, and so on) is present, or
- ice, snow, slush or standing water is present on the ramps, taxiways, or runways.
CAUTION: Do not use engine or wing anti–ice when OAT (on the ground) or TAT (in flight) is above 10°C.
- Engine Anti-ice Operation – On the Ground
Engine anti-ice must be selected ON immediately after both engines are started and remain on during all ground operations when icing conditions exist or are anticipated.
- Wing Anti-ice Operation – On the Ground
Use wing anti-ice during all ground operations between engine start and takeoff when icing conditions exist or are anticipated, unless the airplane is, or will be protected by the application of Type II or Type IV fluid in compliance with an approved ground de-icing program.
Example 1 :
LFPG 24010KT 1200 OVC004 04/01 Q1000
Use of ENG+WING A/I is needed after start.
After T/O, don’t forget to switch ON WING A/I again if needed.
Example 2 :
LFPG 24010KT 2000 OVC012 06/04 Q1000
Use of ENG+WING AI is not needed after start.
As ceiling is low, only ENG AI should be anticipated on ground.
Source : FCOM 1 SP 16 Adverse Weather
