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(a) Each person operating an aircraft shall maintain the cruising altitude or flight level of that aircraft, as the case may be, by reference to an altimeter that is set, when operating— (1) Below 18,000 feet MSL, to— (i) The current reported altimeter setting of a station along the route and within 100 nautical miles of the aircraft;
When traffic, meteorological conditions, or aircraft operational limitations prevent assignment of altitudes prescribed in paragraph 4-5-2, Flight Direction, assign any cardinal altitude or flight level below FL 410 or any odd cardinal flight level at or above FL 410 without regard to direction of flight as follows: NOTE-
When the minimum altitude per 14 CFR Section 91.159 and 14 CFR Section 91.177 is above 18,000 feet MSL, the lowest usable flight level must be the flight level equivalent of the minimum altitude plus the number of feet specified in TBL 7-2-2. ATC will accomplish this calculation.
17 maj 2016 · (This rough rule of thumb can be seen by looking at a lowest-usable-flight-level table: Below 2992 FL180 is unusable, below 2892 FL190 unusable, below 2792 FL200 unusable.) This is close to negligible for separation purposes, given that minimum IFR-IFR vertical separation is 1000 feet and ATC scopes only display altitude to the nearest 100 feet.
(iii) In the case of an aircraft not equipped with a radio, the elevation of the departure airport or an appropriate altimeter setting available before departure; or (2) At or above 18,000 feet MSL, to 29.92″ Hg. (b) The lowest usable flight level is determined by the atmospheric pressure in the area of operation as shown in the following table:
9 paź 2018 · If a change in atmospheric pressure affects a usable flight level in your area of jurisdiction, use TBL 4-5-2 to determine the lowest usable flight level to clear aircraft at or above 18,000 feet MSL.
(a) Each person operating an aircraft shall maintain the cruising altitude or flight level of that aircraft, as the case may be, by reference to an altimeter that is set, when operating— (1) Below 18,000 feet MSL, to— (i) The current reported altimeter setting of a station along the route and within 100 nautical miles of the air-craft;
