# STC SA4-64

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Widgeonworks LLC, United States
- Description: Installation of Lycoming GO-435-C2B engines, Hartzell HC-82X20-2A/9333C-3 or HC-83X20-2A/8433-0 propellers, and associated modifications
- Applied: June 19, 1956
- Status date: April 9, 2026
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS A-734](https://openairdocs.org/tcds/A-734)
- Certificate PDF: https://openairdocs.org/files/sha256/56/af/56afa8a5914a92c09e3fa5f2b8c0c9db1caccbdfa6a3ab79372eeb1a53e1b250
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID165645484720260720185029.0001
- DRS record last changed: July 20, 2026
- Page: https://openairdocs.org/stc/SA4-64

## ADs that name it (0)

None.

## Approved models (3)

- Gulfstream American Corporation G-44 ([TCDS A-734](https://openairdocs.org/tcds/A-734))
- Gulfstream American Corporation G-44A ([TCDS A-734](https://openairdocs.org/tcds/A-734))
- Gulfstream American Corporation SCAN Type 30 ([TCDS A-734](https://openairdocs.org/tcds/A-734))

## 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.

SA4-64 Widgeonworks LLC 1331 Saxon Dr #170 New Smyrna Beach, FL 32169 Part 4a Civil Air Regulations A-734 Gruman G-44, G-44A, SCAN Type 30

1. Compatibility of this design change with previously approved modifications must be determined by the installer.

2. 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.

(Limitations and Conditions continued on page 3 of 3) 06/19/1956 07/31/1961 04/29/1999 06/28/1956 ✔ Michael Linegang Manager, East Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3 lnstallation of Lycoming GO-435-C2B engines, Hartzell HC-82X20- 2A/9333C-3 or HC-83X20-2A/8433-0 propellers and associated modifications in accordance with McKinnon-Hickman Company Drawing List No. 1.

06/06/1984

SA4-64 04/09/2026 3

SA4-64 04/09/2026 Date of Reissue continued:

January 29, 2004, October 06, 2009, August 04, 2010, April 09, 2026

An appropriate FAA (or CAA) Approved Airplane Flight Manual is required as noted below: Aircraft modified in accordance with this STC are eligible for the following gross weights:

1) 4700 lbs. gross weight take-off and landing (land or water). An FAA Approved Airplane Flight Manual must be prepared and provided.

2) 5500 lbs. gross weight take-off and landing (land) and 4700 lbs. gross weight take-off and landing (water) when approved landing gear is installed such as is covered by Supplemental Type Certificate SA4-60 or SA380WE. An FAA Approved Airplane Flight Manual is required such as McKinnon-Hickman Company CAA Approved Flight Manual dated January 12, 1956.

3) 4700 lbs. gross weight take-off and landing (land) and 5500 lbs. gross weight take-off and landing (water) when hull is modified to meet buoyancy requirements of CAR 4a.490(a). An approved modification of this type is covered by Supplemental Type Certificate SA4-61 or SA380WE. An FAA Approved Flight Manual must be prepared and provided.

4) 5500 lbs. gross weight take-off and landing (land and water) when the landing gear and hull modifications installed as noted in items 2 and 3 above are accomplished. McKinnon Enterprises FAA Approved Flight Manual dated January 12, 1956, and Revision 1 dated May 21, 1956, are required. In addition, Revision 2 dated July 11, 1964, and this manual is required when Hartzell HC-82X20-2A9333XC-3 propellers are installed.

NOTE: When more than five (5) persons are carried, an FAA. Approved emergency exit must be provided. Such an approved emergency exit is covered by Supplemental Type Certificate SA4-63 or SA4-967.

------------------------------------------------------END-------------------------------------------------- 3 3 Add Page

## Every issue (4)

- April 9, 2026: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/56/af/56afa8a5914a92c09e3fa5f2b8c0c9db1caccbdfa6a3ab79372eeb1a53e1b250)
- August 4, 2010: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/b4/12/b412711551f671df11a1c37a6d134ba5c919f81f5082eaac6b969af701948a69)
- October 6, 2009: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/4c/41/4c413e880c08ecfc1ffd744a0eb1a6443d2d8b67fca3609ffea9fdbbc67394df)
- January 29, 2004: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/0e/df/0edfd2c9fca8fc966196e07d6ef5115f1d2e1cb56685900732d16030c3441467)

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