# STC SA1720WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Heath Tecna Corporation, United States
- Description: Installation of Heath Tecna struc- tural igloo assembly AC-0123. (707-323C)
- Status date: January 6, 1971
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A26](https://openairdocs.org/tcds/4A26)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6EA665FAA5C0F52C85256CC10083CF63.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1720WE

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 707 ([TCDS 4A26](https://openairdocs.org/tcds/4A26))

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