# SDR FDEA202108122007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 12, 2021
- Submitted: August 13, 2021
- Operation: Air carrier
- Aircraft: [N721FD](https://openairdocs.org/aircraft/N721FD), registered now
- Make and model: Airbus A300 B4-622R
- Registry model: [Airbus A300 B4-622R](https://openairdocs.org/model/airbus-a300-b4-622r) (OpenAirDocs)
- Aircraft serial: 477
- Aircraft time: 52,387 hours, 28,316 cycles
- System (JASC): [3416 · Altimeter, Barometric/Encoder](https://openairdocs.org/jasc/3416)
- Part: Altimeter
- Part number: 641119601
- Part serial: 4386
- Condition: Failed
- Location: Standby
- Part time: 10,171 hours, 6,024 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FDEA202108122007

## Discrepancy

AT FL 360 THE STANDBY ALTIMETER WAS READING 300 FEET HIGHER THAN THE CAPTAIN AND FO ALTIMETERS. AT  LOWER ALTITUDES IT RETURNED TO NORMAL.      REF GMM 12-7-600.  STANDBY ALTIMETER,   CREW REPORTED MAIN  ALTIMETERS OPS NORMAL.  REMOVED AND REPLACED STANDBY ALTIMETER IAW M/M 34-12-  22-04.  OPS CHECKS NORMAL AT THIS TIME.  OK FOR SERVICE.

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