APPENDIX 1. SAMPLE HOLDOVER TIME TABLES
FAA TYPE I HOLDOVER TIME GUIDELINE
TABLE 1. GUIDELINE FOR HOLDOVER TIMES ANTICIPATED FOR SAE TYPE I FLUID MIXTURE AS A FUNCTION OF WEATHER CONDITIONS AND OAT.
CAUTION: THIS TABLE IS FOR USE IN DEPARTURE PLANING ONLY AND SHOULD BE USED IN CONJUNCTION WITH PRE-TAKEOFF CHECK PROCEDURES.
OAT
Approximate Holdover Times Under Various Weather Conditions (hours:minutes)
°C
°F
Frost*
Freezing Fog
Light Snow
Moderate Snow
**Freezing Drizzle
Light Freezing Rain
Rain on Cold Soaked Wing
Other‡
above
-3
above
27
0:45
0:11 - 0:17
0:11 - 0:16
0:06 - 0:11
0:09 - 0:13
0:02 - 0:05
0:02 - 0:05
-3 to -6
27 to 21
0:45
0:08 - 0:14
0:08 - 0:13
0:05 - 0:08
0:07 - 0:10
0:02 - 0:05
-7 to -10
20 to 14
0:45
0:06 - 0:10
0:06 - 0:10
0:04 - 0:06
0:05 - 0:08
0:02 - 0:05
CAUTION: Clear ice may require touch for confirmation
below -10
below 14
0:45
0:05 - 0:09
0:04 - 0:06
0:02 - 0:04
CAUTION: No holdover time guidelines exist
°C = Degrees Celsius OAT = Outside Air Temperature
°F = Degrees Fahrenheit FP = Freezing Point
THE RESPONSIBILITY FOR THE APPLICATION OF THESE DATA REMAINS WITH THE USER.
* During conditions that apply to aircraft protection for ACTIVE FROST
** Use light freezing rain holdover times if positive identification of freezing drizzle is not possible
‡ Heavy snow, snow pellets, ice pellets, moderate and heavy freezing rain, hail
TO USE THESE TIMES, THE FLUID MUST BE HEATED TO A MINIMUM TEMPERATURE OF 60°C (140°F) AT THE NOZZLE AND AT
LEAST 1 LITER/M2 (≈ 2 GALS/100FT2) MUST BE APPLIED TO DEICED SURFACES SAE Type I fluid/water mixture is selected so that the FP of the mixture is at least 10 °C (18 °F) below OAT.
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 WILL 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 I FLUID USED DURING GROUND DEICING/ANTI-ICING IS NOT INTENDED FOR AND DOES NOT PROVIDE PROTECTION DURING FLIGHT.
Effective: October 1, 2002
Page 1
12/20/04 AC 120-60B
Appendix 1
APPENDIX 1. SAMPLE HOLDOVER TIME TABLES (CON’T)
FAA TYPE II HOLDOVER TIME GUIDELINE
TABLE 2 - Guideline for Holdover Times Anticipated for SAE Type II 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
SAE Type II Fluid Concentration
Neat-Fluid/Water
(Vol. %/Vol. %)
Frost*
Freezing Fog
Snow
Freezing Drizzle***
Light Freezing Rain
Rain on Cold Soaked Wing
Other‡
100/0
12:00
0:35-1:30
0:20-0:55
0:30-0:55
0:15-0:30
0:05-0:40
75/25
6:00
0:25-1:00
0:15-0:40
0:20-0:45
0:10-0:25
0:05-0:25
above 0
above 32
50/50
4:00
0:15-0:30
0:05-0:15
0:05-0:15
0:05-0:10
100/0
8:00
0:35-1:30
0:20-0:45
0:30-0:55
0:15-0:30
75/25
5:00
0:25-1:00
0:15-0:30
0:20-0:45
0:10-0:25
0 to -3
32 to 27
50/50
3:00
0:15-0:30
0:05-0:15
0:05-0:15
0:05-0:10
100/0
8:00
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