# SDR 2026FA0000383

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 14, 2026
- Submitted: May 15, 2026
- Operation: General aviation
- Aircraft: [N125CD](https://openairdocs.org/aircraft/N125CD), registered now
- Make and model: Cessna 525B
- Registry model: [Cessna 525B](https://openairdocs.org/model/cessna-525b) (OpenAirDocs)
- Aircraft serial: 525B0710
- Aircraft time: 174 hours, 134 cycles
- System (JASC): [2750 · Trailing Edge Flap Control System](https://openairdocs.org/jasc/2750)
- Part: Flap System
- Part number: 99128391
- Part serial: 0011600156
- Condition: Asymetric
- Part time: 174 hours, 134 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026FA0000383

## Discrepancy

THE INITIAL SQUAWK WAS FOR THE FLAP ACTUATORS NOT LOCKING IN THE FULLY RETRACTED POSITION. THE FLAPS WOULD DROOP DURING TAXI AND/OR WHILE PARKED. DURING THE SERVICE EVENT. THE TECHNICIANS REPORTED THE FLAP ACTUATORS WERE UNLOCKING AT DIFFERENT PRESSURES. THIS WOULD CAUSE A MOMENTARY ASYMMETRIC DEPLOYMENT OF THE FLAPS. TEXTRON ENGINEERING DIRECTED THE THE TECHNICIANS TO REPLACE BOTH FLAP ACTUATORS. AS A PRECAUTION, WE REQUESTED THE FLAP ACTUATORS FROM THE 525B BE INSTALLED RATHER THAN THE NEWER ACTUATORS FROM THE 525B+. ACCORDING TO THE TEXTRON IPC THESE ACTUATORS ARE INTERCHANGEABLE AS LONG AS BOTH LH AND RH ACTUATORS ARE THE SAME PART NUMBER. APPROXIMATELY 5 FLIGHTS HAVE BEEN CONDUCTED WITH NO SIGN OF THE ISSUE RETURNING.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.