Factors affecting contamination and hold-over time:
- ambient temperature
- aircraft surface temperature
- de-icing / anti-icing fluid type, temperature and concentration
- relative humidity
- wind speed and direction
Cold-Soaking Phenomenon
- fuel temperature affects wing surface temperature
- cold-soaking at altitude means fuel in tanks may be much colder than ambient temperature after landing
- clear ice or frost may form on some aircraft on wing areas above fuel tanks, especially in conditions of high relative humidity
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