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when aircraft skin temperature is lower than OAT.
Caution: SAE Type I, II, and IV Fluids used during ground deicing / antiicing
are not intended for and do not provide protection during
flight.
Note: For domestic operations using Types II or IV Fluid, Continental
Airlines may use a diluted mixture for the first step of a two step
(deice, then anti-ice) procedure, but uses only a 100% mixture of Type
II or Type IV fluid for the second step (anti-ice).
Note: Takeoffs in conditions of moderate and heavy freezing rain are not
approved. In lieu of an intensity report (ATC, ATIS, METAR, TAF,
etc.) the following may be used to estimate the intensity of the freezing
rain:
· Light: Scattered drops that, regardless of duration, do not
completely wet an exposed surface, up to a condition where
individual drops are easily seen.
· Moderate: Individual drops are not clearly identifiable; spray is
observable just above pavements and other hard surfaces.
· Heavy: Rain seemingly falls in sheets; individual drops are not
identifiable; heavy spray to height of several inches is observed
over hard surfaces.
737
Flight Manual Continental
Sec. 3 Page 329
Rev. 11/15/02 #41
Guidelines to Holdover Times
Times in Hours : Minutes
Information contained here in is applicable to light to moderate conditions only.
Takeoff in heavy icing conditions prohibited.
Type Fluid
I II IV
Weather
Conditions
OAT °
CELSIUS
**** 50% 75% 100% 50% 75% 100%
Above 0° 4:00 6:00 12:00 4:00 6:00 18:00
0° to -3° 3:00 3:00
-4° to -14°
5:00 5:00
Frost
*
***
-15° to -25°
:45
8:00 12:00
Above 0° :12 to :30
0° to -3°
:15 to
:30
:25 to
1:00
:35 to
1:30
:15 to
:35
1:05 to
1:45
1:05 to
2:15
-4° to -14°
:20 to
:55
:20 to
1:05
:25 to
:50
:20 to
1:20
Freezing
Fog
*
***
-15° to -25°
:06 to :15
:15 to
:20
:15 to
:40
Above 0° :06 to :15
:15 to
:40
:20 to
:55
:05 to
:20
:20 to
:40
:35 to
1:05
0° to - 3° :06 to :15
:05 to
:15 :15 to
:30
:20 to
:45
:05 to
:15
:20 to
:35
:30 to
:55
-4° to -14°
:15 to
:25
:15 to
:35
:15 to
:25
:20 to
:40
Snowfall &
Snow
Grains
*
-15° to -25°
:06 to :15
:15 to
:30
:15 to
:30
Rain &
Cold
Soaked
Wing
Above 0° :02 to :05
:05 to
:25
:05 to
:40
:05 to
:35
:10 to
:50
-3° &
Above
:05 to
:15
:20 to
:45
:30 to
:55
:10 to
:20
:30 to
:50
:40 to
Freezing 1:00
Drizzle
** -4° to -10°
:05 to :08
:15 to
:30
:15 to
:45
:15 to
:30
:20 to
:45
-3° & Above
:05 to
:10
:10 to
:20
:15 to
:30
:05 to
:10
:15 to
:30
:25 to
Light :40
Freezing
Rain -4° to -10°
:02 to :05
:10 to
:30
:10 to
:20
:10 to
:25
Snow
pellets, ice
pellets,
moderate
& heavy
freezing
rain, hail &
heavy
snow
CAUTION: No Holdover time guidelines exist.
* Type II and IV fluids may be used below -25°C, provided the freezing point is at least 7°C below the OAT.
No holdover times exist.
** If positive identification of freezing drizzle is not possible: Use holdover time for "Light Freezing Rain."
*** Long ground stops with high humidity may cause an unacceptable dilution at the actual OAT.
**** SAE Type I fluid / water mixture is selected so that the Freezing Point of the mixture is at least 10°C below
OAT.
Sec. 3 Page 330
Rev. 11/15/02 #41 Continental
737
Flight Manual
Engine Start
When parked on a slippery area, make sure that chocks are applied both in front
and behind the nose and main wheels prior to starting the engines. Chocks may
not hold on slippery areas unless they are sanded. If chocks are not available for
start, use sand or similar material and clear the aircraft for potential movement.
Cold components such as gyros, gauges, actuators, etc., may function slower
　
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