# STC SA4-320

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Jobmaster Company, United States
- Description: Installation of Edo 6470 Floats
- Applied: August 12, 1957
- Status date: October 11, 1957
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS ATC 129](https://openairdocs.org/tcds/ATC%20129)
- Certificate PDF: https://openairdocs.org/files/sha256/42/a2/42a2307d532651368ed0a049251a85a94469afd4d11e7fa2c7521e39d93d085e
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/37EB7EF3FB00910C86257DFF0071C9FD.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-320

## ADs that name it (0)

None.

## Approved models (1)

- Bellanca Aircraft Corporation CH-300 Pacemaker ([TCDS ATC 129](https://openairdocs.org/tcds/ATC%20129))

## What the certificate says

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

1. NAME AND ADDRESS OF APPLICANT Jobmaster Company 1016 First Avenue South Seattle L, Washington.

L9-735 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 Bellanca CH-300 Seaplane NEW MODEL DESIGNATION (If desired)

3. DESCRIPTION OF CHANGE Installation of Ede 6h70 Floats.

The approval of this change in Type Design applies basically to: Standard Bellanca Model CH-300 Airplanes Only.

This approval should not be extended to other specific airplanes of this model on which other previously approved modifications are incorporated, unless it is determined that the interrelationship between this change and any of these other previously approved modifications will introduce no adverse effect upon the airworthiness of that airplane.

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

5. SIGNATURE AND TITLE OF APPLICANT scott Jobmaster Company, аку: 12, 1957. August SIGNATURE Ngr.

Date of Application: TITLE

**6. TO BE COMPLETED BY CAA**

NATURE AND LOCATION OF DATA 10026, contained in above applicant's files and at the Fourth Region Reports No. 11, 2h and 27; J-B1; Draving Nos. JB-23, 28, 29; JB-10025 and Aircraft Engineering Division, Los Angeles.

ORIGINAL TYPE CERTIFICATE NO. CAA APPROVAL 129 Supplemental Type Certificate NO. SIGNATURE We A. Klikoff SAL=320 OF APPROVAL Chief, Aircraft Engineering Division October 11, 1957 TITLE FORM ACA-2417 (7-56) COMM- DC 32484

## Every issue (1)

- October 11, 1957: Issued, Current. [certificate](https://openairdocs.org/files/sha256/42/a2/42a2307d532651368ed0a049251a85a94469afd4d11e7fa2c7521e39d93d085e)

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