# STC SH2928NM

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Columbia Helicopters Inc, United States
- Description: Installation of an improved engine electrical wiring harness on Boeing Vertol 234 with Lycoming AL5512 engines
- Applied: March 11, 1985
- Status date: January 4, 2007
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21, Part 29
- Data sheets: [TCDS H9EA](https://openairdocs.org/tcds/H9EA)
- Certificate PDF: https://openairdocs.org/files/sha256/bf/1e/bf1e8bd09e59531f06888d4caa0043cb068bad4b18bd719a5ae4d630bac1e2e0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/432B28C777DC33FF8625725D004E758B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH2928NM

## ADs that name it (0)

None.

## Approved models (1)

- Boeing Defense & Space Group 234 ([TCDS H9EA](https://openairdocs.org/tcds/H9EA))

## 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.

United States of America Department of Transportation _ Federal Aviation Administration Supplemental Type Certificate Number SH2928NM This certificate, issued to Columbia Helicopters, Inc.

P.O. Box 3500 Portland, OR 97208

Part 29 of the Federal Air Regulation dated February 1, 1965.

Original Product⎯Type Certificate Number: H9EA Make: Boeing Model: 234 Description of the Type Design Change: Installation of an improved engine electrical wiring harness on Boeing Vertol 234 with Lycoming AL5512 engines in accordance with Columbia Helicopters, Inc. Master Drawing List CHI 068, Revision “A”, dated September 13, 2006, or later FAA approved revision. This modification must be maintained in accordance with Columbia Helicopters, Inc. Maintenance Manual Supplement, Document C34- 2/71-51-00, Revision “0”, dated September 28, 2006, or later FAA accepted revisions.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only.

This approval should not be extended to aircraft of these models 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 aircraft. A copy of this certificate, and the Maintenance Manual Supplement shall be maintained as part of the permanent records for 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.

Date of application: March 11, 1985 Date reissued:

Date of issuance: May 8, 1985 Date amended: January 4, 2007

(Signature)

Acting Manager, Seattle Aircraft Certification Office (Title)

## Every issue (1)

- January 4, 2007: Amended, Current. [certificate](https://openairdocs.org/files/sha256/bf/1e/bf1e8bd09e59531f06888d4caa0043cb068bad4b18bd719a5ae4d630bac1e2e0)

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