FAA PROCEDURES

ICAO PROCEDURES

 Limited to 250 Knots below 10,000’

Generally no equivalent

The METAR abbreviation SKC is used to indicate clear sky

CAVOK is used which implies a visibility of 10 km and no cloud condition below 5000 ft or the highest minimum sector altitude and no cumulonimbus or towering cumulus at any level.

The FAA does not prohibit aircraft from departing for their destination when the weather is below approach minimums under part 91, however FAR 135.319 does have restrictions that apply when flying commercially.

ICAO has restrictions which are called “Approach Ban”. They prevent aircraft from departing when the destination weather is below minimums. When operating in a foreign country, those country specific rules apply to U.S. operators.

If the failure occurs in IFR conditions each pilot shall continue the flight according to the following:

Route:

1. By the route assigned in the last ATC clearance received
2. If being radar vectored, by the direct route to the fix or airway
3. In the absence of an assigned route, by the route ATC has advised may be expected
4. In the absence of an assigned or expected route, shall proceed by the filed route

Altitude:

The highest of the following:

1. Altitude assigned in the clearance
2. Minimum altitude for IFR Operations
3. The altitude ATC has advised may be expected

 In ICAO the aircraft shall, while under radar contact, maintain the last assigned speed and level for 7 minutes after the latter of the following:

1. The time the last assigned level or minimum flight altitude is reached
2. The time the transponder is set to Code 7600
3. The aircraft failure to report its position over a compulsory reporting point and thence adjust to the level and speed filed in the flight plan. (ICAO Annex 2 3.6.5.2.2)

While outside of radar contact the aircraft shall maintain the last assigned speed and level, or minimum flight altitude if higher for 20 minutes following the aircraft’s failure to report its position over acompulsory reporting point and thereafter adjust level and speed in accordance with the filed flight plan (ICAO Annex 2 3.6.5.2.2)