# STC SA1821SO

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: Page AvJet Corp, United States
- Description: Installation of single Litton LTN-72RL (048 pgm) Inertial Navigation System.
- Status date: July 9, 2008
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/d0/fa/d0faf74d81363e8a8db40ec60848a3af7e0f50f3e8170946cc9792686ecada9c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F40B71CF66A7A3E4862574BE006761C6.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1821SO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 727-100 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE))

## What the certificate says

The certificate is a scan without a text layer; open the PDF to read it.

## Every issue (1)

- July 9, 2008: Surrendered, Current. [certificate](https://openairdocs.org/files/sha256/d0/fa/d0faf74d81363e8a8db40ec60848a3af7e0f50f3e8170946cc9792686ecada9c)

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