# STC SA2306SO

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: ABX Air Incorporated, United States
- Description: Installation of the Sperry directional gyro system.
- Applied: November 2, 1987
- Status date: May 22, 2013
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25)
- Certificate PDF: https://openairdocs.org/files/sha256/83/20/8320fcc04a58e053eb1d8c51ad1bfb4958a89897852281217ed9b80431cce5ab
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/398EF3B5A8B8079486257B9B006B517A.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA2306SO

## ADs that name it (0)

None.

## Approved models (2)

- McDonnell Douglas Corporation DC-8-61 ([TCDS 4A25](https://openairdocs.org/tcds/4A25))
- McDonnell Douglas Corporation DC-8-63 ([TCDS 4A25](https://openairdocs.org/tcds/4A25))

## What the certificate says

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

## Every issue (1)

- May 22, 2013: Surrendered, Current. [certificate](https://openairdocs.org/files/sha256/83/20/8320fcc04a58e053eb1d8c51ad1bfb4958a89897852281217ed9b80431cce5ab)

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