# STC SA1138WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Celesco Industries, United States
- Description: Installation of fire warning monitoring circuit in engine fire detection system. (707-227, 720-027)
- Status date: June 8, 1973
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A21](https://openairdocs.org/tcds/4A21), [TCDS 4A28](https://openairdocs.org/tcds/4A28)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A98BA84B4DE0E09985256CC10080DEBF.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1138WE

## ADs that name it (0)

None.

## Approved models (2)

- The Boeing Company 707 ([TCDS 4A21](https://openairdocs.org/tcds/4A21))
- The Boeing Company 720 ([TCDS 4A28](https://openairdocs.org/tcds/4A28))

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