# STC SA171GL

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Courter, Inc, United States
- Description: Replace differential synchro and switch in Courter flap position indicator, P/N 18-1299-3, with Courter flap asymetry detector kit, P/N 298-1026-01 or -02.
- Status date: December 21, 1978
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A26](https://openairdocs.org/tcds/4A26)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D5ED1B542EF3379785256CC10083CF5A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA171GL

## ADs that name it (0)

None.

## Approved models (4)

- The Boeing Company 707-300 ([TCDS 4A26](https://openairdocs.org/tcds/4A26))
- The Boeing Company 707-300B ([TCDS 4A26](https://openairdocs.org/tcds/4A26))
- The Boeing Company 707-300C ([TCDS 4A26](https://openairdocs.org/tcds/4A26))
- The Boeing Company 707-400 Series ([TCDS 4A26](https://openairdocs.org/tcds/4A26))

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