# STC SH390NW

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Measurement Systems Intl Inc, United States
- Description: Installation of an electronic weighing system, for monitoring cargo hook weight, in accordance with Measurement Systems International, Inc., Installation drawing No. D00327, Sheets 1 and 2, or Drawing D00473, Rev. E.
- Applied: November 6, 1975
- Status date: April 28, 2004
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21, Part 27
- Data sheets: [TCDS H3WE](https://openairdocs.org/tcds/H3WE)
- Certificate PDF: https://openairdocs.org/files/sha256/7e/d2/7ed283ea167a44a7e40e37959c33d897ad9eb3977b5aebd6a9b0241a58dbcb79
- Approved model list and other attachments: [SH390NW-AML.pdf](https://openairdocs.org/files/sha256/ee/ad/eeadfd4a04a0a08cf0a6bba65ead526ba6db83cf82d5e88b1d41b26d2fe8e370)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/62DB13B661D632FE86256E8900641997.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SH390NW

## ADs that name it (0)

None.

## Approved models (12)

- MD Helicopter Inc. 369 ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 369A ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 369D ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 369E ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 369F ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 369FF ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 369H ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 369HE ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 369HM ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 369HS ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 500N ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))
- MD Helicopter Inc. 600N ([TCDS H3WE](https://openairdocs.org/tcds/H3WE))

## 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 SH390NW

This certificate, issued to Measurement Systems International, Inc.

14240 Interurban Avenue South Seattle, WA 98168 Part * of the * Regulations.

Original ProductType Certificate Number: *See attached Aproved Model List (AML) No.

Mak e: SH390NW for a list of approved rotorcraft models Model: and applicable airworthiness regulations.

Description of the Type Design Change: Installation of an electronic weighing system, for monitoring cargo hook weight, in accordance with Measurement Systems International, Inc., Installation drawing No. D00327, Sheets 1 and 2, or Drawing D00473, Rev. E.

Limitations and Conditions: Approval of this change in type design applies to the above model rotorcraft only. This approval should not be extended to other rotorcraft of this model 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 rotorcraft. A copy of this certificate and the Rotorcraft Flight Manuel Supplement, dated April 19, 1977, or later FAA approved revision, must be maintained as part of the permanent records for 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: November 6, 1975 Date reissued: April 19, 1977 Date of issuance: January 3, 1977 Date amended: December 4, 1980; April 28, 2004

(Signature)

Acting Manager, Seattle Aircraft Certification Office (Title)

### SH390NW-AML.pdf

**FAA APPROVED MODEL LIST (AML) NO. SH390NW**

Measurement Systems International, Inc.

for Electronic Weighing System ( for monitoring cargo hook weight )

ISSUE DATE: April 28, 2004

**ITEM AIRCRAFT MAKE**

**AIRCRAFT MODEL**

**ORIGINAL TYPE**

**CERTIFICATE NUMBER**

**CERTIFICATION**

**BASIS FOR**

**ALTERATION**

**FAA APPROVED**

**ROTORCRAFT FLIGHT**

MANUAL SUPPLEMENT Number Revision*

**FAA APPROVED DRAWING LISTS**

Drawing Revision* AML REV DATE

1. MDHI (Hughes) 369 Series 500N H3WE CAR 6 N/A Dated 4/19/77 MSI D00473

Rev. E

2. MDHI (Hughes)

600N H3WE Part 27 N/A Dated 4/19/77 MSI D00473 Rev. E * Or later FAA Approved Revision

FAA Approved: ______________________________ Acting Manager, Seattle Aircraft Certification Office

Page 1 of 1

## Every issue (1)

- April 28, 2004: Amended, Current. [certificate](https://openairdocs.org/files/sha256/7e/d2/7ed283ea167a44a7e40e37959c33d897ad9eb3977b5aebd6a9b0241a58dbcb79), [SH390NW-AML.pdf](https://openairdocs.org/files/sha256/ee/ad/eeadfd4a04a0a08cf0a6bba65ead526ba6db83cf82d5e88b1d41b26d2fe8e370)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.