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0:20-1:05
0:15-0:35
**0:15-0:45
**0:10-0:25
below
-3 to -14
below
27 to 7
75/25
5:00
0:20-0:55
0:15-0:25
**0:15-0:30
**0:10-0:20
CAUTION:
Clear ice
may require
touch for
confirmation
CAUTION:
No holdover
time guidelines
exist
below
-14 to -25
below
7 to -13
100/0
8:00
0:15-0:20
0:15-0:30
below
-25
below
-13
100/0
SAE Type II fluid may be used below –25 °C (-13 °F) provided the freezing point of the fluid is at least 7 °C (13 °F) below the OAT and the aerodynamic acceptance criteria are met. Consider use of SAE Type I when SAE Type II fluid cannot be used.
°C = Degrees Celsius OAT = Outside Air Temperature
°F = Degrees Fahrenheit VOL = Volume
THE RESPONSIBILITY FOR THE APPLICATION OF THESE DATA REMAINS WITH THE USER.
* During conditions that apply to aircraft protection for ACTIVE FROST
** No holdover time guidelines exist for this condition below -10 °C (14 °F)
*** Use light freezing rain holdover times if positive identification of freezing drizzle is not possible
‡ Snow pellets, ice pellets, heavy snow, moderate and heavy freezing rain, hail
Snow includes snow grains
CAUTIONS:
• THE TIME OF PROTECTION WILL BE SHORTENED IN HEAVY WEATHER CONDITIONS. HEAVY PRECIPITATION RATES OR HIGH MOISTURE CONTENT, HIGH WIND VELOCITY OR JET BLAST MAY REDUCE HOLDOVER TIME BELOW THE LOWEST TIME STATED IN THE RANGE. HOLDOVER TIME MAY BE REDUCED WHEN AIRCRAFT SKIN TEMPERATURE IS LOWER THAN OAT.
• SAE TYPE II FLUID USED DURING GROUND DEICING/ANTI-ICING IS NOT INTENDED FOR AND DOES NOT PROVIDE PROTECTION DURING FLIGHT.
NOTE: Type III fluids are no longer used in the United States. Therefore, Table 3 is currently not offered.
Page 2
AC 120-60B 12/20/04
Appendix 1
APPENDIX 1. SAMPLE HOLDOVER TIME TABLES (CON’T)
FAA TYPE IV HOLDOVER TIME GUIDELINE
TABLE 4 - Guideline for Holdover Times Anticipated for SAE Type IV Fluid Mixtures as a Function of Weather Conditions and OAT.
CAUTION: THIS TABLE IS FOR USE IN DEPARTURE PLANNING ONLY, AND IT SHOULD BE USED IN CONJUNCTION WITH PRE-TAKEOFF CHECK PROCEDURES.
OAT
Approximate Holdover Times under Various Weather Conditions (hours: minutes)
°C
°F
Concentration Neat-Fluid/Water
SAE Type IV Fluid
(Vol. %/Vol. %)
Frost*
Freezing Fog
Snow
Freezing Drizzle***
Light Freezing Rain
Rain on Cold Soaked Wing
Other‡
100/0
18:00
1:05-2:15
0:35-1:05
0:40-1:10
0:25-0:40
0:10-0:50
75/25
6:00
1:05-1:45
0:30-1:05
0:35-0:50
0:15-0:30
0:05-0:35
above 0
above 32
50/50
4:00
0:15-0:35
0:05-0:20
0:10-0:20
0:05-0:10
100/0
12:00
1:05-2:15
0:30-0:55
0:40-1:10
0:25-0:40
75/25
5:00
1:05-1:45
0:25-0:50
0:35-0:50
0:15-0:30
0 to -3
32 to 27
50/50
3:00
0:15-0:35
0:05-0:15
0:10-0:20
0:05-0:10
100/0
12:00
0:20-1:20
0:20-0:40
**0:20-0:45
**0:10-0:25
below
-3 to -14
below
27 to 7
75/25
5:00
0:25-0:50
0:15-0:25
**0:15-0:30
**0:10-0:20
CAUTION:
Clear ice may require
touch for confirmation
CAUTION:
No holdover
time guidelines
exist
below
-14 to -25
below
7 to -13
100/0
12:00
0:15-0:40
0:15-0:30
below -25
below -13
100/0
SAE Type IV fluid may be used below –25 °C (-13 °F) provided the freezing point of the fluid is at least 7 °C(13 °F) below the OAT and the aerodynamic acceptance criteria are met. Consider use of SAE Type I when SAE Type IV fluid cannot be used.
°C = Degrees Celsius OAT = Outside Air Temperature
°F = Degrees Fahrenheit VOL = Volume
THE RESPONSIBILITY FOR THE APPLICATION OF THESE DATA REMAINS WITH THE USER.
* During conditions that apply to aircraft protection for ACTIVE FROST
** No holdover time guidelines exist for this condition below -10 °C (14 °F)
*** Use light freezing rain holdover times if positive identification of freezing drizzle is not possible
‡ Snow pellets, ice pellets, heavy snow, moderate and heavy freezing rain, hail
Snow includes snow grains
CAUTIONS:
• THE TIME OF PROTECTION WILL BE SHORTENED IN HEAVY WEATHER CONDITIONS. HEAVY PRECIPITATION RATES OR HIGH MOISTURE CONTENT, HIGH WIND VELOCITY OR JET BLAST MAY REDUCE HOLDOVER TIME BELOW THE LOWEST TIME STATED IN THE RANGE. HOLDOVER TIME MAY BE REDUCED WHEN AIRCRAFT SKIN TEMPERATURE IS LOWER THAN OAT.
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GROUND DEICING AND ANTI-ICING PROGRAM地面除防冰大纲(8)
