# STC SA3939NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: California Precision Hydraulics, Inc, United States
- Description: Installation of Bell Industries Piston-Shoe Sub-assembly, P/N 700001 as a replacement part for Sundstrand P/N 728638 or 700631 when used in Sundstrand Model No. 60AGD12 Constant Speed Drives (CSD).
- Status date: December 6, 1996
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1AFF5D21541DFB2285256CC2000C5BCE.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3939NM

## ADs that name it (0)

None.

## Approved models (2)

- McDonnell Douglas Corporation DC-8-50 Series ([TCDS 4A25](https://openairdocs.org/tcds/4A25))
- McDonnell Douglas Corporation DC-8-72 ([TCDS 4A25](https://openairdocs.org/tcds/4A25))

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