# STC SA91AL

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Univair Aircraft Corp
- Description: Change of brake system from drum and shoe type to disc type as used on PA-22-108 by changing brake parts.
- Status date: July 9, 1981
- Data sheets: 1A6, 1A6, 1A6
- Certificate PDF: https://openairdocs.org/files/sha256/04/b2/04b281dd127939055da7846c3b1f4976ceb27adb1d5a09590cbc58c0081ff4ff
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/749E8F12A561706E85256CC20058EA7A.0001
- Page: https://openairdocs.org/stc/SA91AL

## ADs that name it

None.

## Approved models (3)

- Piper Aircraft Inc. PA-22-135 (TCDS 1A6)
- Piper Aircraft Inc. PA-22-150 (TCDS 1A6)
- Piper Aircraft Inc. PA-22-160 (TCDS 1A6)

## What the certificate says

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

## Every issue (1)

- July 9, 1981: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/04/b2/04b281dd127939055da7846c3b1f4976ceb27adb1d5a09590cbc58c0081ff4ff)

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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.