What is the minimum separation between aircraft landing?
Category I aircraft landing behind Category I or II- 3,000 feet. Category II aircraft landing behind Category I or II- 4,500 feet. When either is a category III aircraft- 6,000 feet.
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Category I aircraft landing behind Category I or II- 3,000 feet. Category II aircraft landing behind Category I or II- 4,500 feet. When either is a category III aircraft- 6,000 feet.
You need to name an alternate airport on your IFR flight plan if, for the period of time one hour before and one hour after your estimated time of arrival, the weather is forecast to include a ceiling of 2,000 feet agl and/or visibilities less than three statute miles (the 1-2-3 rule).
In aviation medicine, the 1% rule is a risk threshold that is applied to the medical fitness of pilots. The 1% rule states that a 1% per annum risk (See also risk management) of medical incapacitation is the threshold between acceptable and unacceptable.
For a predicted dry runway condition the AFM dry distance is factored (multiplied) by 1.67 to achieve the 60% Dry factored landing distance. This longer distance is compared to LDA.