# SDR 96ZZZX558

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 17, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N39WP
- Make and model: Cessna 650
- Registry model: [Cessna 650](https://openairdocs.org/model/cessna-650) (OpenAirDocs)
- Aircraft serial: 6500039
- System (JASC): [3452 · ATC Transponder System](https://openairdocs.org/jasc/3452)
- Part: Transponder
- Part number: 6221270001
- Condition: Failed
- Location: Nr 2
- Component: Collins
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX558

## Discrepancy

REINSTALLED ADC AFTER MOD STATUS UPGRADE AND CERTIFICATION.  WHILE COMPLYING WITH CFR SECTION 91.411/91.413 FUNCTION TEST, NOTED NR 2 TRANSPONDER ALTITUDE READ-OUT WAS INVALID FROM 500 FEET TO 1,000 FEET AND AT EACH ASCENDING 500 FOOT INCREMENT TO THE NEXT THOUSAND.  IN DESCENDING ALTITUDE TESTS, THE NR 2 TRANSPONDER READ INVALID FROM EACH 1,000 FOOT ALTITUDE READING THROUGH EACH 500 FOOT ALTITUDE LEVEL.  REMOVED AND REPLACED TRANSPONDER AND REQUESTED SHOP BENCH REPORT ON FINDINGS.

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