# SDR DHL2001709009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 14, 2001
- Submitted: June 15, 2001
- Operation: Air carrier
- Aircraft: N709DH
- Make and model: Boeing 727-82C
- Registry model: [Boeing 727-82C](https://openairdocs.org/model/boeing-727-82c) (OpenAirDocs)
- Aircraft serial: 19968
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Autopilot Sys
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DHL2001709009

## Discrepancy

AT FL350 WITH A/P ENGAGED AND ELEVATOR IN A OR B MODE, A/P PITCHES UP AND WILL NOT HOLD ALTITUDE.  (BEGINS ALTITUDE OSCILLATION AND OVER CORRECTS WITH TRIM).  AUTOPILOT DEFERRED PER DHL MEL 22-1 CAT B, DMI 6023 PLACARD INSTALLED.  COULD NOT DUPLICATE ON GROUND.  SWAPPED CAPTS AND AUCX GYRO FOR TROUBLESHOOTING.  OPS CHECKS GOOD IAW B727 MM 23-11-01 AND 34-22-21.  DMI 6023 CLEARED.

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