# STC SA1668GL

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: ABX Air Incorporated, United States
- Description: Installation of number 3 Sperry Gyro P/N 2587335-12.
- Applied: July 19, 1991
- Status date: April 9, 2013
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- Certificate PDF: https://openairdocs.org/files/sha256/cd/a0/cda0820484d69190a357fdeea31e76fa22ce15c45b8f05b623e2daac2e683143
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/869EA6BA03EB502786257B5D006C71F0.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1668GL

## ADs that name it (0)

None.

## Approved models (8)

- McDonnell Douglas Corporation DC-9-31 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-32 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-32F ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-33F ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-34 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-34F ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-41 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-51 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))

## What the certificate says

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

## Every issue (1)

- April 9, 2013: Surrendered, Current. [certificate](https://openairdocs.org/files/sha256/cd/a0/cda0820484d69190a357fdeea31e76fa22ce15c45b8f05b623e2daac2e683143)

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