# STC SA3870WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: AlliedSignal Aviation Services, United States
- Description: Installation of Garrett AiResearch TFE-731-3-1H engines and related changes.
- Status date: June 3, 1993
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A3EU](https://openairdocs.org/tcds/A3EU)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DC45E67363A79D9185256CC2000C5B32.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3870WE

## ADs that name it (2)

- [AD 84-21-01 R1](https://openairdocs.org/ad/84-21-01-R1): Replacement Fuses - ZL Panel · BH.125 Series 400A, BH.125 Series 600A, DH.125 Series 1A and 9 more. Effective Feb 11, 1985. Cited in the text
- [AD 81-06-06](https://openairdocs.org/ad/81-06-06): Fuel Feed Lines · Garrett AiResearch TFE-731-3-1H engines (AlliedSignal Aviation Services STC SA3870WE). Effective Mar 26, 1981. Named in the applicability

## Approved models (3)

- Raytheon Aircraft Company BH.125 Series 400A ([TCDS A3EU](https://openairdocs.org/tcds/A3EU))
- Raytheon Aircraft Company DH.125 Series 3A/RA ([TCDS A3EU](https://openairdocs.org/tcds/A3EU))
- Raytheon Aircraft Company DH.125 Series 400A ([TCDS A3EU](https://openairdocs.org/tcds/A3EU))

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