# STC SH1839NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Hartzell Engine Technologies, LLC, United States
- Description: Installation of Skytronics, Part No. 7150T-300-1 Alternators
- Applied: January 5, 1982
- Status date: March 6, 2014
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS 4H12](https://openairdocs.org/tcds/4H12)
- Certificate PDF: https://openairdocs.org/files/sha256/26/f5/26f5eb45fca92549857f07264d4ee96dada50aef2d3f3ec46dfda225c71c5372
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0919A2AC5AB64DF386257C9B007012F8.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH1839NM

## ADs that name it (0)

None.

## Approved models (4)

- Sikorsky Aircraft Corporation 269A ([TCDS 4H12](https://openairdocs.org/tcds/4H12))
- Sikorsky Aircraft Corporation 269A-1 ([TCDS 4H12](https://openairdocs.org/tcds/4H12))
- Sikorsky Aircraft Corporation 269B ([TCDS 4H12](https://openairdocs.org/tcds/4H12))
- Sikorsky Aircraft Corporation 269C ([TCDS 4H12](https://openairdocs.org/tcds/4H12))

## 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 SH1839NM

This Certificate issued to

Part 6 of the Civil Air Regulations.

(See type Certificate Data Sheet No. 4H12)

Description of Type Design Change: Installation of Skytronics, Part No. 7150T-300-1 Alternators in accordance with FAA sealed Skytronics, Inc. Master Drawing List No. 5175, revision “D” dated February 17, 1983, or later FAA approved revision.

Limitations and Conditions: The installation should not be incorporated in any aircraft unless it is determined that the interrelationship between this installation and any previously approved configuration will not introduce any adverse effect upon the airworthiness of the aircraft. The approval of this modification applies to the above noted airplane model series only. A copy of this STC must be included in the permanent records of the modified aircraft 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 4H12

Hughes Helicopters

269A, A-1, B and C Original Product Type Certificate Number :

Date of application : January 5, 1982

Date of issuance : March 9, 1983

Date reissued : March 6, 2014

(Signature) Supervisor, Technical & 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/sha256/26/f5/26f5eb45fca92549857f07264d4ee96dada50aef2d3f3ec46dfda225c71c5372)
- March 9, 1983: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/1d/2d/1d2d3d2a188d163fa7d5edbbd3a726b67df8b95ff5ffd0f390e1dd7becc75d12)

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