# STC SA1918SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Airborne Express Inc., United States
- Description: Installation of third Sperry directional gyro system.
- Applied: October 18, 1985
- Status date: May 1, 1986
- Product: Aircraft, Large Airplane
- Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25)
- Certificate PDF: https://openairdocs.org/files/sha256/cd/f8/cdf81d9adbfd53eb1001178232cec0958fab96a4043069d7482e1eb7b2938536
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID174005950020260811180941.0001
- DRS record last changed: August 11, 2026
- Page: https://openairdocs.org/stc/SA1918SO

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-8-62 ([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 (2)

- May 1, 1986: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/cd/f8/cdf81d9adbfd53eb1001178232cec0958fab96a4043069d7482e1eb7b2938536)
- April 2, 1986: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/29/4f/294fb58185ae45bcce9355a4afd7564d39612a888faacfd2331bdf0946d06484)

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