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Calibration Labs

A World or National Altitude record must be confirmed by a Category One lab calibration after the flight. A Category Two calibration will suffice for all other flight confirmations.

For a list of Calibration Labs click here.

Category One Laboratory: All conditions must be met.

  1. Barometry equipment for calibration shall adhere to the guidelines set in DOT Advisory Circular AC 43-2 B, dated 10/16/80. This AC lists accuracy minimums, temperature corrections and maintenance necessary for mercury manometer systems. A mercury manometer shall be used.
  2. Pressure measurements must be accurate to + - 5.4 ft. at sea level and 50 ft. at 55,000 ft. Instrument sen sitivity to + - .006 in. Hg.
  3. Cold soak equipment must be available.
  4. Lab must be an FAA Approved Station, Bureau of Standards or military facility to ensure periodic inspections of laboratory equipment and procedures.

Category Two Laboratory: All conditions must be met.

  1. Altitude may be measured by a mercury manometer or a certified sensitive altimeter.
  2. When a manometer is used, a factory ICAO altitude scale is preferred for use to avoid pressure/altitude conversion errors.
  3. A certified sensitive altimeter should be new or recently rebuilt. A certification per FAR 43, Appendix E made within 24 months must be on hand as reference for altitude corrections. A table vibrator should be used to reduce friction effects in the altimeter. Calibrations shall run as the altimeter was calibrated, during ascent. The altimeter shall have a sensitivity of 5ft at sea level and 20 ft. at 30,000 ft.
  4. Repeatable accuracy to + - 10 ft. at sea level (.01 in Hg) and to + - 40 ft. at 30,000 (.02 in Hg) must be demonstrated.
  5. FAA Approved Stations are preferred, persons sensitive to the specific needs of soaring pilots are permitted.

Posted: 7/17/2007

FAI Badge and Records Committee 

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