STC SH4-235

Supplemental type certificate · Aetna Helicopters Inc

Holder
Aetna Helicopters Inc · United States
Status
Current · Issued
Status date
June 28, 1957
Applied
May 29, 1957
Product
Aircraft · Rotorcraft
Certification basis
Part 21
Data sheet
TCDSH-1

From FAA DRS, with our copy of the certificate PDF. DRS record last changed December 6, 2025.

What it approves

Installed Franklin model 6V-335-A engine restricted to 200 hp.

What the certificate saysOCR

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

FORM ACA-2417 U.S. DEPARTMENT OF COMMERCE Supplemental Type Certificate

1. NAME AND ADDRESS OF APPLICANT Aetna Helicopters Inc.

Etna, California

3. DESCRIPTION OF CHANGE Form Approved, Budget Bureau No. 41-R1823 INSTRUCTIONS - Submit in triplicate to local CAA Aviation Safety Agent. Copy will be returned to applicant upon issuance.

Supplemental Type Certificate APPLIED FOR:

AIRCRAFT ENGINE PROPELLER

ORIGINAL MODEL DESIGNATION Bell Model 47G NEW MODEL DESIGNATION (If desired) None Installed Franklin Model 6V-335-A engine restricted to 200 horsepower in accordence with technical data (prepared on a Form ACA-337) dated March 9, 1957.

NOTE: Aetna Helicopters Inc. Helicopter Flight Manual Supplement dated June 28, 1957 required with this installation.

4a. WILL DATA BE AVAILABLE FOR SALE OR RELEASE TO OTHER PERSONS? YES NO WILL PARTS BE MANUFACTURED FOR SALE (Ref. CAR 1.55)? YES A NO

5. SIGNATURE AND TITLE OF APPLICANT Hobort Be Primbig Lu SIGNATURE May 29, 1957 Secretary/Manage:

Date of Application: TITLE

6. TO BE COMPLETED BY CAA

NATURE AND LOCATION OF DATA Technical data (prepared on Form ACA-337) dated March 9, 1957, filed at Aetna Helicopters Inc. and Region 4 Aireraft Engineering Division, ORIGINAL TYPE CERTIFICATE NO. CAA APPROVAL HTC1 Supplemental Type Certificate NO.

SIGNATURE SH4-235 TE OF APPROVAL Chief, Aireraft Engineering Division June 28, 1957 TITLE COMM- DC 32484 FORM ACA-2417 (7-56)

ADs that name this STC · 0

An AD can apply because an STC is installed, or mention one in its text.

No AD in this release names this STC

Approved models · 1

MakeModelData sheet
Scotts-Bell 47 Inc47GH-1