# STC SA477NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Fitts, Robert, United States
- Description: Installation of a Lycoming engine and a Hartzell propeller
- Applied: January 10, 1977
- Status date: July 8, 1977
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A-782](https://openairdocs.org/tcds/A-782)
- Certificate PDF: https://openairdocs.org/files/sha256/6d/b0/6db06cda64e856eff73f9563b4552640d12b1316c20e006ad4451d74daba641b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7B0936D663DFB62886257A450047CBE0.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA477NW

## ADs that name it (0)

None.

## Approved models (1)

- Sierra Hotel Aero Inc. Navion B ([TCDS A-782](https://openairdocs.org/tcds/A-782))

## What the certificate says

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

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number 5217701 This certificate issued to: ROBERT FITTS Part 3 of the CiviI Air Regulations, Effective November 13, 1945.

Original Product Type bertificate Number: A-782 Make: Navion Model: IB" Description of Type Design Change: Installation of a Lycoming G0-480-G2D6 engine and a Hartzell PHC-A3VF-4/9333C-3 propeller and associated systems in accordance with Robert Fitts photographs 1 through 7.

Limilatuns andtendilions: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Navion Model "B", Serial Number NAV-4-2100B. A copy of this Certificate and Addendum Number SA477NW shall be maintained as part of the permanent records for the modified aircraft.

Date of Application: January 10, 1977 I ate wissued:

Date of Issuance: July 8, 1977 Date Amended:

FÉDERAL AVIATION Byfdirection of the (Signature ) *MINISTRATO Chief, Engineering and Manufacturing Branch (Title) 47 FAA FORM 8110-2 (10-68)

United States of America Department of Transportation Federal Aviation Administration Supplemental Tope Certificate (Continuation Sheet) July 8, 1977 Number SA477NW Supplemental Type Certificate ADDENDUM NO. SA477NW The conditions and limitations of Type Certificate Data Sheet Number A-782 apply except where superseded by the following:

Supplemental Type Certificate Data Sheet, which is part of STC SA477NW prescribes the conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Federal Aviation Regulations.

Supplemental Type Certificate HOLDER: Robert Fitts NAVION MODEL 'B", 4PCLM (NORMAL CATEGORY) AS MODIFIED BY SIC SA477NW Engine: Lycoming GO-480-G2D6 Engine Limits: 295 HP at 3400 RPM for One Minute Maximum Continuous Power - 285 HP @ 3100 RPM Fuel: 100/130 Octane Fuel Pressure Limits: 15 psi maximum, 9 psi minimum Propeller and Propeller Limits:

Cylinder Head Temperature:

Oil Inlet Temperature:

Hartzell PHC-A3VF-4/9333C-3 Diameter: 93" maximum; 89 5/8" minimum Pitch Setting at 30" Sta:

High - 32.3°; Low - 12.0° 475°F (Bayonet Type) maximum 235°F maximum Oil Pressure Limits: 85 psi maximum; 65 psi minimum; 25 psi idle Serial Number Eligible: NAV-4-2100B Airspeed Limits: Same as shown on Data Sheet A-782 Maximum Weight: 2850 pounds. Same as shown on Data Sheet A-782

**FAA FORM 8110-2-1 (10-69) PAGE 3 OF 4 PAGES C FAA AC 73-2651**

July 8, 1977 STC SA477NW Oil Coolers: Harrison Models 1070UA314A and 5" x 7" Auxiliary Fuel Pump: Adel Type 23967, 12 volt D.C., 50 gpm Electrical Equipment: Battery No. 2 added to system at Sta. +190 - 35 pounds Instrument Markings: Manifold Pressure:

Green Arc - Between 15" and 29.5" Tachometer:

Green Arc - 2500 rpm to 3100 rpm Yellow Arc - 3100 rpm to 3400 rpm Red Line - 3400 rpm Placards: 1 . POWER LIMITS TAKEOFF FOR ONE MIN.

**FULL THROTTLE-3400**

**RPM MAXIMUM CONTINUOUS POWER - 3100 RPM**

2. AIRCRAFT LOADING: The following placard shall be be displayed in full view of the piloe:

**CONFIGURATION LOADING PILOT/COPILOT ONLY 10 GALLON**

**FUEL REQD**

**IN AUX TANK**

PILOT/COPILOT NO BALLAST PAS SEAT MIN. 100 LBS. REQUIRED Noise Certification Procedure:

Compliance with FAR 36, Appendix F, was shown with the following procedure:

Level flyover at 1000 feet AGL at 3100 engine rpm and full throttle manifold pressure. The certificated noise level is 72.25 dB(A). This noise level reflects correction of as measured data to a standard 70°F, 77% R.H. acoustic day as well as a -5 dB(A) credit resulting from aircraft takeoff and climb characteristics.

Maximum dB(A) allowed is 77 dB(A).

- END - Page 4 of 4 Pages

## Every issue (1)

- July 8, 1977: Issued, Current. [certificate](https://openairdocs.org/files/sha256/6d/b0/6db06cda64e856eff73f9563b4552640d12b1316c20e006ad4451d74daba641b)

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