# STC SA121GL

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: MPC Products Corporation, United States
- Description: Installation of bleed-air valve actuator, P/N G66, to replace Boeing P/N 10-60817, in various locations in anti-ice system.
- Status date: November 3, 1976
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6BA212DF95A04FD085256CC10080E032.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA121GL

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))

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From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.