# STC SA2535NM - Type: Supplemental type certificate - Status: Current, Amended - Holder: William L. Foschaar, United States - Description: Installation of Lycoming 0-320-A3A engine and Hartzell HC-C2YL-4BF/FC-7663-4 propeller, fiber glass cowling, associated engine changes, modified airspeed system, and other miscellaneous changes. - Applied: September 6, 1984 - Status date: July 16, 1985 - Product: Aircraft - Certification basis: Part 21 - Data sheets: [TCDS A-766](https://openairdocs.org/tcds/A-766) - Certificate PDF: https://openairdocs.org/files/sha256/92/1c/921c972f9b87fe8453e6184983c3c9411e1e5b462afa73bf2e022be3eab7a2b6 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/031D199BB908FB43862579D60075AB53.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA2535NM ## ADs that name it (0) None. ## Approved models (1) - Swift Museum Foundation Inc. GC-1B ([TCDS A-766](https://openairdocs.org/tcds/A-766)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. - 1045 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SA25 35NM This certificate issued to: William L. Foschaar 909 Dara Street Camarillo, CA 93010 Part 42 of the CiViL Ais Regulations Original Product - Sype berlificate Number: A-766 Make: Swift Museum (Globe) Murtel: GC-1B, S/N 223 (N80820) Descriplion glype-Design lahange: Installation of Lycoming 0-320-A3A engine and Hartzel IC-C2YL-4BF/FC-7663-4 propeller, fiber glass cowling, associated engine cnanges modified airspeed system, and other miscellaneous changes in accordance with William L. Foschaar Report No. 1, Revision A, dated July 15, 1985. Limitations and Conditions: Data not suitable for reproduction of installation in other aircraft; therefore, they are satisfactory for Swift GC-1B, S/N 223 only. No additional modifications of this type are to be approved solely by reference to this Supplemental Type Certificate or to the data submitted therefor. Supplemental Type Certificate Addendum No. SA2535NM is a part of this certificate. A copy of this certificate and William L. Foschaar Installation Report No. 1, Revision A, dated July 15, 1985 shall be maintained as a part of the permanent records for this modified aircraft. Date of Application: September 6, 1984 Dale wissued: Date of Issuance: . April 12, 1985 Date Amended: July 16, 1985 FEDERAL AVIATIO Marvice By Direction of the Administrator Rammelaterg (Signature) TOMINISTRATO CHARLES I. BLOMER, Manager Western Aircraft Certification Office (Title) 47. (1) April 12, 1985 Number SA2535NM (A) July 16, 1985 Supplemental Type Certificate ADDENDUM NO. SA2535NM The conditions and limitations of Aircraft Specification No. A-766 apply except as follows: This Addendum, which is part of Supplemental Type Certificate No. SA2535NM, prescribes conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Civil Air Regulations. A copy of this Addendum shall be maintained as part of the modified aircraft's permanent Supplemental Type Certificate Holder: William L. Foschaar I - Model Swift GC-1B, S/N 223 (N80820) (Normal Category), as modified by STC SA2535NM Engine Lycoming 0-320-A3A Fuel 80/87 Minimum Grade Aviation Gasoline Engine, Limits For all operations: 125 HP, 2700 rpm, 24.9" MP @ SL 125 HP, 2700 rpm, 23.7" MP @ 5700 ft Straight line variation between points given. Propeller and Hartzell HC-C2YL Propeller Limits Hub Model: HC-C2YL-4BF Blade Model: FC-7663-4 Diameter: Maximum 72 in. Minimum 70 in. Pitch Settings: 30 in. Station Low 12.0° High 26.0° Governor: Woodward 210080R Oil Capacity 8 quarts (-15.5) 47. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) (I) April 12, 1985 Number: SA2535 MM (A) July 16, 1985 Supplemental Type Certificate ADDENDUM NO. SA2535NM (cont.) Powerplant Instrument Tachometer: 2700 RPM(Red Radial) Markings: Manifold Pressure Gage: 24.9 in. Hg. (Red Radial) Oil Temperature Gage: 245°F (Red Radial) Oil Pressure Gage: 25 psi (Red Radial) - Mininum 100 psi (Red Radial) - Maximum 60-90 psi (Green Are) - Normal Fuel Pressure Gage: 0.5 psi (Red Radial) - Minimum 6 psi (Red Radial) - Maximum 0.5-6 psi (Green Arc) - Normal Cylinder Head Temp.: 500 ° F (Well-type thermocouple on #4 cylinder) - Maximum Serial Numbers Eligible: No. 223 only Certification Basis: Same as specified by Aircraft Specification No. A-766. NOTE I. Current weight and balance report including list of equipment included in certificated empty weight, and loading instructions when necessary, must be in the aircraft. NOTE 2. The following placards must be installed in front of and in clear view of the pilot: (a) ENGINE OPERATION LIMITS: 125 H.P. FOR ALL OPERATIONS 2700 RPM AND 24.9 INCHES HG. @ SEA LEVEL 2700 RPM AND 23.7 INCHES HG. @ 5,700 FEET (STRAIGHT LINE VARIATIONS OF M.P. WITH ALTITUDE BETWEEN POINTS GIVEN.)" (b) "PROPELLER - PUSH TO INCREASE" (c) "ELECTRIC FUEL PUMP MUST BE ON DURING TAKE-OFF" The following placard must be displayed at the wing tank filler cap: "FUEL - 80/87 MINIMUM GRADE AVIATION GASOLINE - 27.8 GALLONS CAPACITY." - END - **FAA FORM 8110-2-1 (10-69)** ## Every issue (1) - July 16, 1985: Amended, Current. [certificate](https://openairdocs.org/files/sha256/92/1c/921c972f9b87fe8453e6184983c3c9411e1e5b462afa73bf2e022be3eab7a2b6) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.