# STC SA677NW - Type: Supplemental type certificate - Status: Current, Issued - Holder: Howell Harley L, United States - Description: Installation of a Continental engine and McCauley propeller - Applied: July 1, 1976 - Status date: November 29, 1978 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS A-766](https://openairdocs.org/tcds/A-766) - Certificate PDF: https://openairdocs.org/files/sha256/ea/fc/eafccecc6d92af43015585bdab7a4e1600db22768bcca6e4fecbddbf51a86aec - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/416376F89829F8AF86257A410067B385.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA677NW ## 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. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA677NW This certificate issued to: Harley L. Howell Purt 42 of the CiVil Air Regulations Original Product - TypeCertificate Number: A-766 Make: Universal (Globe) Model: GC-1B Description of Type Design Change: Installation of a Continental TS10-360-A and a McCauley D2A34C67/76C-2 propeller with associated equipment and modified cowling in accordance with Harley L. Howell photographs 1 through 5. Limitations and Conditions: Data pertaining to this modification are considered inadequate for duplication in other aircraft. This approval is limited to the installation in Universal (Globe), Model GC-1B, Serial No. 364l only. A copy of this Certificate and Addendum SA677NW shall be maintained as part of the permanent records for the modified aircraft. Lute sfupplication: JUlY 1, 1976 Date Reissued: Date of Issuance: November 29, 1978 Date Amended: FEDERAL AVIATION Charts throeder (Signature ) TO MINISTRATIO Chief, Engineering and Manufacturing Branch (Title) 47 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) NUY 2 2 1978 Number: SA677NW Supplemental Type Certificate ADDENDUM NO. SA677NW The conditions and limitations of Type Certificate Data Sheet A-766 apply except where superseded by the following: Supplemental Type Certificate Data Sheet, which is part of STC SA677NW, prescribes the conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Civil Air Regulations. UNIVERSAL (GLOBE) GC-1B (LANDPLANE, NORMAL CATEGORY) AS MODIFIED BY STC SA677NW Engine: Continental TS10-360-A Engine Limits: Critical Altitude -- 195 hp at 2800 rpm and 32.0 inches Hg at 20,000 ft. Takeoff hp, 1 minute -- 210 hp at 2800 rpm at 32.0 inches Hg Max. Continuous -- 2600 rpm @ 27 in. Hg Cylinder Head Temperatures: Head = 460°F Oil Inlet = 240°F Oil Pressure: Max. Cold = 100 psig Normal = 30 to 60 psig Idle = 10 psig Fuel: 100/100LL aviation gasoline Fuel Pressure: Inlet to injection pump, min = -2 psig max = +8 ps1g Outlet to vapor return line = +3.5 psig at takeoff speed and power Induction and Exhaust System Limits: Induction Air Max. Temperature at all Power Settings = 250°F Exhaust System Max. Back Pressure at 1.5 inches from cylinder flange; 40 inches Hg absolute Crankshaft: Two 6th order dampers 47. **PAGE 3 OF 4 PAGES FAA AC 73-2651** NOV & 0 1978 SA677NW Propeller McCauley D2A34C67/76C-2 Propeller Limits: Continental I0-360-C&D engines, with two 6th order dampers, at 210 hp 2800 rpm Air Speed Limits: Same as specified in Type Certificate Data Sheet A-766 C. G. Range: 29.6" to 33.5" @ 1960 pounds Maximum Weight: 1960 pounds Placards: 2800 rpm at 32" manifold pressure for 1 minute and 2600 rpm at 27" manifold pressure thereafter - END - Page 4 of 4 Pages ## Every issue (1) - November 29, 1978: Issued, Current. [certificate](https://openairdocs.org/files/sha256/ea/fc/eafccecc6d92af43015585bdab7a4e1600db22768bcca6e4fecbddbf51a86aec) --- 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.