# STC SA1-89

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: McCauley Propeller Systems, United States
- Description: Installation of McCauley Propeller Systems fixed pitch MET-L-Prop models 1A170/GM7452 and 1A170/GM7454
- Applied: August 24, 1957
- Status date: August 15, 2006
- Product: Aircraft, Single-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS 1A4](https://openairdocs.org/tcds/1A4)
- Certificate PDF: https://openairdocs.org/files/sha256/a2/66/a266c2118aa8687ae607f5561d2a4dab25369fab9c95e29ab0d06ebf264fe66b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AAFF126AFD0C4C21862571D2006BFD5E.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1-89

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-20 Series ([TCDS 1A4](https://openairdocs.org/tcds/1A4))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

FAA FORM 8110-2(10-68) PAGE 3 of 2 PAGES Number SA1-89 This certificate issued to McCauley Propeller Systems 7751 East Pawnee Wichita, KS 67207

Part 3 of the Civil Air Regulations.

See Type Certificate Data Sheet 1A4 for complete certification basis.

Original Product-Type Certificate Number : 1A4 Make : The New Piper Aircraft, Inc Model : PA-20-125 Description of Type Design Change:

Installation of McCauley Propeller Systems fixed pitch MET-L-Prop models 1A170/GM7452 and 1A170/GM7454 in accordance with McCauley Blade Drawing 1A170, Hub Boss Process Drawing C-1964 and Propeller Installation C- 1965, Revision A.

1. Compatibility of this design change with previously approved modifications must be determined by the installer.

2. FAA Approved Airplane Flight Manual Supplement dated August 28, 1957 or later FAA approved revision, is required.

3. The PA-20-125 has Lycoming O-290-D engine installed. The McCauley 1A170/GM propeller has vibration approval on this engine per Propeller Specification P857-6. Static RPM not over 2300, not under 2200.

Diameter not over 74 inches, not under 72.5 inches (no additional tolerance permitted).

4. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

This certificate and the supporting data, which is the basis for approval, shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration.

Date reissued : August 1, 1975 August 15, 2006

( Signature) Thaddeus D. Krolicki, Jr.

Manager, Propulsion Branch Chicago Aircraft Certification Office

(Title) Date of application: August 24, 1957

Date of issuance : August 30, 1957

## Every issue (1)

- August 15, 2006: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/a2/66/a266c2118aa8687ae607f5561d2a4dab25369fab9c95e29ab0d06ebf264fe66b)

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