# STC SH277WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Heck Research LLC, United States
- Description: Installation of UH-12C Upper Canopy.
- Applied: May 27, 1980
- Status date: November 13, 2014
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS 6H2](https://openairdocs.org/tcds/6H2)
- Certificate PDF: https://openairdocs.org/files/sha256/c0/fe/c0fe9d5a5040c61d4372f182313f805cec61631268915972ed316ba6c8988a3f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6A6DCDA556AB209486257D96004AB590.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH277WE

## ADs that name it (0)

None.

## Approved models (1)

- Hiller Aviation UH-12B ([TCDS 6H2](https://openairdocs.org/tcds/6H2))

## 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.

This Certificate issued to Heck Research LLC 7939 Longbay Blvd.

Sarasota, Florida 34243 Part 6 of the Civil Air Regulations.

Original Product Type Certificate Number : 6H2 Make Hiller Model UH-12B Normal Category Description of Type Design Change: Installation of UH-12C Upper Canopy in accordance with Helicopter Repair Service, Inc. Installation Instructions HRSI 1002, dated November 17, 1980.

Helicopter Repair Services, Inc. FAA Approved RFM Supplement dated December 10, 1980, is required

Limitations and Conditions : The approval of this cha nge in type design applies to the basic aircraft of the specified models that are otherwise unmodified. This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated, unless it is determined by the installer 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 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.

Date of application : May 27, 1980

Date of issuance : December 10, 1980

Date reissued : June 8, 1994, November 13, 2014

(Signature) Haifa Haj-Eid Supervisor, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office (Title)

Transfer the ownership of Supplemental Type Certificate Number

to (Name of transferee)

(Address of transferee) (Number and street)

(City, State, and ZIP Code)

from (Name of grantor) (Print or type)

(Address of grantor) (Number and street)

(City, State, and ZIP Code)

Signature of grantor (In ink):

U.S. GPO 1987-763-28

Number SH277WE

Limitations and Conditions continued: This addendum which is part of Supplemental Type Certificate No.

SH277WE, prescribes conditions and limitations under which the product for which the Supplemental Type Certificate was issued meets the airworthiness requirements of the Civil Air regulations. This addendum supersedes Helicopter Specification No 6HI only where noted.

I - Model UH-12B Normal Category Helicopters with shid gear only as modified by STC SH277WE

C.G. Range: Refer to Hiller Service Bulletin No 51.

The 8ᵒ Hub is not eligible. The 12-9 Degree Hub is required. (+80.1) to (84.6).

Maximum Weight: 2500 lb.

Horizontal Stabilizer Setting: 0ᵒ (with helicopter level).

Serial Nos. Eligible: 210 and 296 through 748.

Required Equipment: In addition to the equipment applicable and required by Helicopter Specification No. 6H2 the equipment specified by Helicopter Repair Service, Inc. Installation Instructions No. HRSI 1002 dated November 17, 1980, must be installed as a result to this STC.

-------------------------------------END-------------------------------

## Every issue (1)

- November 13, 2014: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/c0/fe/c0fe9d5a5040c61d4372f182313f805cec61631268915972ed316ba6c8988a3f)

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