# STC SA4-647

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Glasco-Air Products, United States
- Description: Application of glass cloth to rudder.
- Status date: January 1, 1960
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS LTC-11](https://openairdocs.org/tcds/LTC-11)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3EE2EA5D924441DE862570D00072DAA7.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA4-647

## ADs that name it (0)

None.

## Approved models (3)

- North American Aviation Inc. Army P-51C ([TCDS LTC-11](https://openairdocs.org/tcds/LTC-11))
- North American Aviation Inc. Army P-51D ([TCDS LTC-11](https://openairdocs.org/tcds/LTC-11))
- North American Aviation Inc. Army P-51K ([TCDS LTC-11](https://openairdocs.org/tcds/LTC-11))

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