4-5-5
Adjusted Minimum Flight Level
JO 7110.65BB, Change 3, effective July 9, 2026 · Official text on faa.gov
When the prescribed minimum altitude for IFR operations is at or above 18,000 feet MSL and the atmospheric pressure is less than 29.92”, add the appropriate adjustment factor from TBL 4-5-3 to the flight level equivalent of the minimum altitude in feet to determine the adjusted minimum flight level.
| Altimeter Setting | Adjustment Factor |
|---|---|
| 29.92” or higher | None |
| 29.91” to 29.42” | 500 feet |
| 29.41” to 28.92” | 1,000 feet |
| 28.91” to 28.42” | 1,500 feet |
| 28.41” to 27.92” | 2,000 feet |