# STC SA89GL

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Northwest Airlines Inc.
- Description: Installation of Bendix GPW-83 ground proximity warning system. (727-51C, -51, -227, -151C, -14, -251)
- Status date: June 29, 1988
- Data sheets: A3WE, A3WE
- Certificate PDF: https://openairdocs.org/files/sha256/17/e2/17e22e4b4d2750cb74d5ca0c8c6598b6b225d2bdb96ded7af7dc15fff77c7256
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID119290181320260720180121.0001
- Page: https://openairdocs.org/stc/SA89GL

## ADs that name it

None.

## Approved models (2)

- The Boeing Company 727-100 Series (TCDS A3WE)
- The Boeing Company 727-200 Series (TCDS A3WE)

## What the certificate says

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

## Every issue (4)

- June 29, 1988: Amended, Current. [certificate](https://openairdocs.org/files/sha256/17/e2/17e22e4b4d2750cb74d5ca0c8c6598b6b225d2bdb96ded7af7dc15fff77c7256)
- July 21, 1983: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/d2/45/d2453debaca6d65268d1fdeff0ffe5a41857bbebefc8f4e587f950be968cd157)
- May 10, 1983: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/59/cf/59cf4f3e3c0a16ca92739007cc6ceeaf9978232a55b01491590b634f5cb98cfd)
- September 29, 1975: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/0d/a7/0da7b46898a419863664277d7a2ae395d707c67c420f3fc4c8be1e91f8fe6ce4)

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From OpenAirDocs.org, an independent open copy of FAA data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.