# STC SH4986NM

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Onboard Systems International, United States
- Description: Fabrication, installation, and inspection of onboard systems model E-74 cargo hook load cell system.
- Applied: October 5, 1990
- Status date: October 2, 2007
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21, Part 21, Part 29
- Data sheets: [TCDS H13EU](https://openairdocs.org/tcds/H13EU)
- Certificate PDF: https://openairdocs.org/files/sha256/44/83/448372bca328f67b6fdb5fb6c39690cc5fb9c18b2f6c2d97f15fec931b15c0e1
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A5D226973C8D7AF08625737000721A67.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH4986NM

## ADs that name it (0)

None.

## Approved models (4)

- Eurocopter Deutschland GmbH MBB-BK 117 A-1 ([TCDS H13EU](https://openairdocs.org/tcds/H13EU))
- Eurocopter Deutschland GmbH MBB-BK 117 A-3 ([TCDS H13EU](https://openairdocs.org/tcds/H13EU))
- Eurocopter Deutschland GmbH MBB-BK 117 A-4 ([TCDS H13EU](https://openairdocs.org/tcds/H13EU))
- Eurocopter Deutschland GmbH MBB-BK 117 B-1 ([TCDS H13EU](https://openairdocs.org/tcds/H13EU))

## 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.

Un ited S tates of Am erica Department of Transportation Federal Aviation Administration Supplemental Type Certificate

Number SH4986NM

This certificate, issued to Onboard Systems 13915 NW 3rd Court Vancouver, WA 98685

Part 29 of the Federal Aviation Regulations (FAR 21.29 and FAR 29 effective 2/1/65 plus Amdt. 29-1 through 29-16).

Original ProductType Certificate Number: H13EU Make: Messerschmitt-Bolkow-Blohm GMBH Model: MBB-BK 117 A-1, MBB-BK 117 A-3, MBB-BK 117 A-4, and MBB-BK 117 B-1

Description of the Type Design Change: Fabrication OF Onboard Systems Model E-74 Cargo Hook Load Weigh System, P/N 200-062-01, in accordance with FAA-approved Onboard Systems Master Drawing List No. 155-017-00, Revision 7 dated March 7, 2007, or later FAA-approved revision; and, Installation of this system in accordance with FAA-approved Onboard Systems Owners Manual No. 120-023- 00, Revision 5 dated December 1, 2006, or later FAA-approved revision. Inspect load cell in accordance with Section 5 of Onboard Systems Owners Manual No. 120-023-00, dated December 1, 2006, or later FAA-approved revision.

Limitations and Conditions: Approval of this change in type design applies to only those models listed above, which are equipped with a 117-80127 cargo hook. This approval should not be extended to other rotorcraft of these models on which other previously approved modifications are incorporated unless it is determined by the installer that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that helicopter.

Rotorcraft modified in accordance with this STC must be operated in accordance with an FAA-approved copy of Onboard Systems Rotorcraft Flight Manual Supplement (RFMS) 121-040-00, Revision 0, dated October 1, 2007, or later FAA-approved revision. A copy of this certificate, FAA-approved RFMS, and Maintenance Manual must be maintained as part of the permanent records of the modified rotorcraft.

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: October 5, 1990 Date reissued:

Date of issuance: October 24, 1990 Date amended: November 21, 1990, October 2, 2007

(Signature)

Acting Manager, Seattle Aircraft Certification Office (Title)

## Every issue (1)

- October 2, 2007: Amended, Current. [certificate](https://openairdocs.org/files/sha256/44/83/448372bca328f67b6fdb5fb6c39690cc5fb9c18b2f6c2d97f15fec931b15c0e1)

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