# STC SA1685WE

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Puerto Rico Intl Airlines, United States
- Description: Installation of four Continental IO-520-E engines.
- Status date: August 22, 1968
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-816](https://openairdocs.org/tcds/A-816)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FB2A55478F8143EB85256CCB00601865.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1685WE

## ADs that name it (3)

- [AD 97-18-02](https://openairdocs.org/ad/97-18-02) (historical): Blades · Hartzell Propeller BHC-A2V, BHC-A2XF-1, BHC-A2XF-3 and 3 more. Effective Sep 11, 1997. Cited in the text
- [AD 77-14-07](https://openairdocs.org/ad/77-14-07) (historical): Blank Shank · Hartzell Propeller EHC-A3VF with STC SA1685WE. Effective Jul 14, 1977. Named in the applicability
- [AD 75-16-22](https://openairdocs.org/ad/75-16-22): Counterweight Bushings · de Havilland Aircraft Co., Ltd., The D.H.114 Heron Series 2A, D.H.114 Heron Series 2DA and D.H.114 Heron Series 2X with STC SA1685WE. Effective Aug 8, 1975. Named in the applicability

## Approved models (3)

- The de Havilland Aircraft Co. Ltd (England) DH 114 Heron; Series 2A ([TCDS A-816](https://openairdocs.org/tcds/A-816))
- The de Havilland Aircraft Co. Ltd (England) DH 114 Heron; Series 2DA ([TCDS A-816](https://openairdocs.org/tcds/A-816))
- The de Havilland Aircraft Co. Ltd (England) DH 114 Heron; Series 2X ([TCDS A-816](https://openairdocs.org/tcds/A-816))

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