Relevant Discussion: AIM 5-4-5, 7-1-11, 7-2-1 through 7-2-5, P/C Glossary, FAA-H-8083-16, AC 00-45, AC 91-70, AC 120-28D, Order 7110.65T
Everything Explained: Altimetry Around the World
Key Takeaways:
- Q codes, specifically QNH, QNE, and QFE, define different altimeter settings crucial for aviation, indicating local altitude, pressure altitude, or height above an airfield.
- Pilots switch between QNH (local altimeter setting) below a transition altitude and QNE (standard pressure setting of 29.92 inHg or 1013.2 hPa) at or above it, with transition altitudes varying by country.
- International flight requires awareness of regional differences in altimeter settings (e.g., inches of mercury vs. hectopascals) and the diminishing use of QFE (altimeter reads zero on the ground).
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