# STC SA4728NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: P Ponk Aviation, United States
- Description: Removal of the Continental TSI0-520-M engine and installation of a Continental I0-520-F engine and McCauley D3A32C90/82NC-2 propeller in accordance with P. Ponk Aviation Photographs 1 through 11 and Conversion Report No. ANM-100S-0657, dated March 2, 1989, or later FAA approved revision.
- Applied: January 21, 1989
- Status date: January 21, 1989
- Product: Aircraft
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS A4CE](https://openairdocs.org/tcds/A4CE)
- Certificate PDF: https://openairdocs.org/files/sha256/6a/e7/6ae7cf1c278a5234b9e74408d40945b5bbf8cb60764eb6deca2bd5438edf6de8
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FE32389FFDC50B95862579C80075417A.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA4728NM

## ADs that name it (0)

None.

## Approved models (1)

- Cessna Aircraft Company TU206G ([TCDS A4CE](https://openairdocs.org/tcds/A4CE))

## 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.

Number SA4728NM

This certificate, issued to: P. Ponk Aviation

Part 3 of the Civil Air Regulations.

effective 5/15/56, as Amended by 3-1 through 3-8. Dual wheel amphibious float criteria Special Conditions dated 1/14/69 and Amendment No. 1 dated 2/20/69. FAR 36 effective 11/22/88.

Original ProductType Certificate Number: A4CE Make: Cessna Model: TU206G

Description of the Type Design Change: Removal of the Continental TSI0-520-M engine and installation of a Continental I0-520-F engine and McCauley D3A32C90/82NC-2 propeller in accordance with P. Ponk Aviation Photographs 1 through 11 and Conversion Report No. ANM-100S-0657, dated March 2, 1989, or later FAA approved revision.

Limitations and Conditions: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Cessna Model TU206G aircraft, Serial Number U20603623 only. A copy of this Certificate and Continuation Sheet must be maintained as part of the permanent records for the modified aircraft.

FAR 36 compliance was shown using the No Acoustic Change determination of FAR 21.93(b).

Date of application: January 21, 1989 Date reissued:

Date of issuance: April 28, 1989 Date amended:

(Signature) Acting Manager, Seattle Aircraft Certification Office (Title)

Number SA4728NM

LIMITATIONS AND CONDITIONS: (continued)

Engine: Continental I0-520-F

Engine Limits: Takeoff (5 min.) - 300 Hp @ 2850 RPM Maximum Except Takeoff (METO) - 285 Hp @ 2600 RPM

Fuel: 100/130 Minimum Grade Aviation Gasoline

Propeller and Propeller Limits: McCauley constant speed propeller installation

(a) D3A32C90 hub with 82NC02 blades Diameter: not over 80"; not under 78" Pitch settings @ 30" Sta.: Low 11.5 0; High 28.1 0

(b) Cessna spinner 1250909

(c) Woodward hydraulic governor 210462 or McCauley hydraulic governor C290D2/T4 or C290D4/T4

Powerplant Instrument Markings: 2850 (Red radial)

C .G. Range: No change.

Cylinder Head Temp.

Probe Location: Number 3 cylinder

Required Placards: Install in plain view of the pilot, replacing the TU206G fuel flow placard:

**MAXIMUM POWER SETTI--NGS AND FUEL FLOW TAKEOFF (5 MIN.**

ONLY): 2850 RPM; MAXIMUM CONTINUOUS POWER: 2700 RPM

FUEL FLOW AT FULL THROTTLE 2700 RPM 2850 RPM S.L. 23 gph 24 gph 4000 ft. 21 gph 22 gph 8000 ft. 19 gph 20 gph 12000 ft. 17 gph 18 gph

- END -

**FAA FORM 8110-2-1 (10-69) PAGE 3 OF 3 PAGES**

## Every issue (1)

- January 21, 1989: Issued, Current. [certificate](https://openairdocs.org/files/sha256/6a/e7/6ae7cf1c278a5234b9e74408d40945b5bbf8cb60764eb6deca2bd5438edf6de8)

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