# STC SA971WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Hartzell Engine Technologies, LLC, United States
- Description: Installation of a Jasco #6540 (35a.) Alternator Kit or a Jasco #6555 (50a.) Alternator Kit
- Applied: March 15, 1965
- Status date: March 6, 2014
- Product: Aircraft, Small Airplane
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS 3A19](https://openairdocs.org/tcds/3A19), [TCDS A-799](https://openairdocs.org/tcds/A-799), [TCDS 3A12](https://openairdocs.org/tcds/3A12), [TCDS 3A17](https://openairdocs.org/tcds/3A17)
- Certificate PDF: https://openairdocs.org/files/sha256/eb/14/eb14c46567ed02094ccc099d41c5f98d713da1d2626128413fd56028923246dd
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9108027BF4228C0E86257C9B006A50C5.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA971WE

## ADs that name it (0)

None.

## Approved models (51, first 50)

- Cessna Aircraft Company 150 ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150A ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150B ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150C ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150D ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150E ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150F ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150G ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150H ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150J ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150K ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150L ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 150M ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 152 ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company 170 ([TCDS A-799](https://openairdocs.org/tcds/A-799))
- Cessna Aircraft Company 170A ([TCDS A-799](https://openairdocs.org/tcds/A-799))
- Cessna Aircraft Company 170B ([TCDS A-799](https://openairdocs.org/tcds/A-799))
- Cessna Aircraft Company 172 ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172A ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172B ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172C ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172D ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172E ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172F (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172G ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172H (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172I ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172K ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172L ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172M ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172N ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172P ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172Q ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172R ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172RG ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company 172S ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 175 ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company 175A ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company 175B ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company 175C ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company A150K ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company A150L ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company A150M ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company A152 ([TCDS 3A19](https://openairdocs.org/tcds/3A19))
- Cessna Aircraft Company P172D ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company R172E ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company R172F ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company R172G ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company R172H ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- Cessna Aircraft Company R172J ([TCDS 3A17](https://openairdocs.org/tcds/3A17))

All 51: https://openairdocs.org/stc/SA971WE/models.md

## 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.

Number SA971WE

This Certificate issued to

Part 3 of the Civil Air Regulations.

Description of Type Design Change: Installation of a Jasco #6540 (35a.) Alternator Kit or a Jasco #6555 (50a.) Alternator Kit in accordance with Jasco #6540-6555 Installation Instructions dated March 9, 1965 or the installation of a Jasco Alternator P/N 6560-1, a 12 volt system per FAA sealed Skytronics Top Drawing 3013 no change revision, or later FAA approved revision, in the following aircraft:

Model T.C.# Model T.C.# 150 3A19 172 3A12 170 799 175 3A17

Limitations and Conditions: The approval should not be extended to other specific airplanes of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that airplane. 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.

Hartzell Engine Technologies, LLC 2900 Selma Highway Montgomery, Alabama 36108 Listed below

Cessna

150, 170, 172, and 175 Original Product Type Certificate Number :

Date of application : March 15, 1965

Date of issuance : June 10, 1965

Date reissued : March 13, 1969, March 6, 2014

Date amended : October 29, 1976

(Signature) Supervisor, Technical and Administrative Support Staff, Los Angeles Aircraft Certification Office

(Title)

Number (STC No.)

Limitations and Conditions continued

## Every issue (2)

- March 6, 2014: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/eb/14/eb14c46567ed02094ccc099d41c5f98d713da1d2626128413fd56028923246dd)
- October 29, 1976: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/0a/21/0a21f027014f9b262e529167704fed574f905b7f4059c6ddc8ee3bfdc2d1102b)

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