15
3.6.2 Calibration Procedures
Note: The Primary Flight Altimeter must be calibrated per
part 43 section E. Verify compliance with AC-43.13 as appli-
cable.
1. Connect the pitot-static test set to the aircraft static system. The SAE5-35 must be
connected to the aircraft static line near the flight altimeter and the two altitude adjust-
ments buttons must be accessible. Apply power to the altitude encoder and the ATC
transponder and allow the encoder to stabilize. Set primary flight altimeter to 29.92
inches of mercury.
2. Apply vacuum from the pitot-static test set to obtain an altimeter reading of 34,800 feet
(or 100 feet below the maximum test altitude specified in Part 43, appendix F.)
3. Slowly increase altitude and note the flight altimeter at the encoder transition point. If the
transition point is not 34,850 +/- 30 feet (or between –80 feet and –20 feet below the
maximum test altitude), press the increase button (behind slot A) or decrease button
(behind slot B) until the encoder transition point is within tolerance.
4. Increase altitude to obtain an altimeter reading of 35,000 feet (or 100 feet above the
maximum altitude specified in Part 43, appendix F.)
5. Slowly decrease altitude and read the flight altimeter at the encoder transition point. Verify
the transition point is 34,950 +/- 30 feet (or between 20 feet and 80 feet above the maxi-
mum test altitude.) If necessary, press the increase button (behind slot A) or decrease
button (behind slot B) until the encoder transition point is within tolerance.
6. Apply pressure from the pitot-static test set to obtain an altimeter reading of -800feet
7. Slowly decrease altitude and read the flight altimeter at the encoder –800 foot to –900-
transition point. If the transition point is higher than -880 feet, hold the increase altitude
button (behind slot A) while pressing and releasing the decrease altitude button (behind
slot B) until the transition point is –850 +/- 30feet. If the transition point is lower than -
820 feet, hold the decrease altitude button (behind slot B) while pressing and releasing the
increase altitude button (behind slot A) until the transition point is –850 +/- 30feet.
8. Apply pressure from the pitot-static test set to obtain an altimeter reading of -1000feet
9. Slowly increase altitude and read the flight altimeter at the encoder –1000 foot to –900-
transition point. If the transition point is higher than -920 feet, hold the increase altitude
button (behind slot A) while pressing and releasing the decrease altitude button (behind
slot B) until the transition point is –950 +/- 30 feet. If the transition point is lower than -
