# STC SA4127WE - Type: Supplemental type certificate - Status: Current, Issued - Holder: Stilwell Floyd D, United States - Description: Installation of an AiResearch TPE331-1-101Z turboprop engine. - Applied: January 17, 1977 - Status date: April 18, 1980 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: [TCDS 1A16](https://openairdocs.org/tcds/1A16) - Certificate PDF: https://openairdocs.org/files/sha256/33/cc/33ccfb839c5c5de9e4cdcd074157fb445f310c30eb70e45e0065897a00d2d05e - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FEAE01DA67C239F385256CC2000C60FD.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA4127WE ## ADs that name it (0) None. ## Approved models (1) - Allied Ag Cat Productions Inc. G-164C ([TCDS 1A16](https://openairdocs.org/tcds/1A16)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. A6879WE-DS United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number 514127 WE This certificate issued to: Floyd D. Stilwell Part * othe Civil Air Reyulations. * See page 4 of this STC for certification basis. Original Product Type Fertificale. Number: 1A16 Make: Grumman American Make: G-164C Descriplin/ Type Desiyn lihange: Installation of an AiResearch РЕ331-1-1012 turboprop engine in accordance with Floyd D. Stilwell DrawiAh approved revision "F" dated March 18, 1980, or later FAA sealed revisions. Floyd D. Stilwell Flight Manual Supplement dated April 17, 198Q or later FAA approved revisions, is required as part of this installation. Jimilatuns and fundiliend: The limitations and conditions of Data Sheet 1A16 apply except as outlined in pages 3 through 5 of this STC. A copy of this STC must be included in the permanent records of each airplane modified in accordance with this STC. Date of Application: January 17, 1977 Date Reissued: Valesfissuance: Apri1 18, 1980 Date Amended: FEDERAL AVIATION By desting they time nis tales Anguishin TO MINISTRATO Acting Chef, Aircraft Engineering Division (Title) 47. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA4127 NE 1 - Grumman American G-164C as modified by this STC Engine AiResearch TPE331-1-101Z Fuel AiResearch EMS 53111 (Type A) AiResearch EMS 53112 (Type A-1) AiResearch EMS 53113 (Class A-JP4 and Class B Type B) AiResearch EMS 53116 (Type JP-5) British D. Eng. R.D. 2482 Issue 2 British D. Eng. R.D. 2486 Issue 2 British D. Eng. R.D. 2494 Issue 4 Aviation gasoline MIL-G-5572D, Grade 80/87, not in excess of 1000 gallons per 100 hours of operation, may be used for emergency fuel operation. Fuel MIL-I-27686D or E Fuel System Icing Inhibitor, or an equivalent Additives inhibitor, may be added in a quantity not in excess of 0.15 percent by volume, to fuels not containing anti-icing inhibitors. Shell ASA-3 anti-static additive, or equivalent, may be used in amounts to bring the fuel up to 300 conductivity units, but in no event shall the additive exceed 1 ppm. Sohio Biobor JF Biocide Additive, or equivalent, is approved for use in the fuel at a concentration not to exceed 20 ppm of elemental Boron. Oil Oils conforming to AiResearch Manufacturing Company of Arizona Specification EMS 53110 (Type I and Type II). Engine Ratings Takeoff 600 SHP (55 psi torque) Maximum Continuous 600 SHP (55 psi torque) Reverse 600 SHP (55 psi torque) Engine Output Shaft Speed 2000 RPM Limits Transient Overspeed (b secs.) 2100 RPM ranslent Overspeed (5 mins. 2020 RPM Reverse 2000 RPM **FAA FORM 8110-2-1 (10-59) PAGE 3 OF 5 PAGES C FAA AC 73-2651** United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA4127WE Torque Takeoff (5 mins.) 55 p.s.1. Maximum Continuous 55 p.s.i. Reverse 55 p.s.i. Exhaust Gas Takeoff (5 mins.) 578° C Temperature Maximum Continuous 556°C Starting (1 sec.) 815°C Reverse 578°C Oil Pressure Takeoff and Maximum Continuous 70 to 120 psig Idle (minimum) 40 psig Oil MIL-L-23699 -40°C to 127°C Temperature MIL-L-7808 - 40°C to 93°C Propeller Hartzell HC-B3TN-5E/T10282+4 Min. length 101 inches diameter Max. length 106 inches diameter Max. Approved 30,000 feet Altitude C.G. Range Maximum weight 6300 pounds; Forward d.g. limit 121.8 inches and Weight aft of datum Aft d.g. limit 123.5 inches aft of datum (Datum is 81.1 inches forward of engine firewall) Applicability The approval of this change in type design applies to the basic aircraft of the model shown on page 1 of this STC that is otherwise unmodified. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. See "Equipment" below. Certification (a) CAR 8.10(a) (1) dated October 11, 1950 Basis (b) FAR 23, effective February 1, 1965, including Amendments 23-1 through 23-16 only as applies to turboprop engine installation. **FAA FORM 8110-2-1 (10-69) PAGE 4OF 5 PAGES FAA AC 73-2651** United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Numbes SAA127WE (C) Special Federal Aviation Regulation 2/, effective vanuary 1, 19/9, including Amendment 27-1. Production An inflight operational check must be conducted in Basis accordance with FAR 91.167(a) for each aircraft midified to incorporate this Supplemental Type Certificate. The following must be installed in the aircraft for airworthiness certificate subsequent to the incorporating of this STC: 1. The basic required equipment as prescribed in the applicable airworthiness regulations (See "Certification Basis" outlined above). 2. The additional required items shown in FAA sealed Floyd D. Stilwell Equipment List MA-107. NOTE: Equipment items approved for the basic Grumman American G-164C are not eligible with this STC unless such items are also shown on the above noted equipment list or unless it is determined that the interrelationship between those items and the modifications covered by this STC will introduce no adverse effect on the airworthiness of that aircraft. NOTE 1. Refer to the applicable FAA Approved Airplane Flight Manual for required placards and instruments markings. NOTE 2. The ratings shown on the AiResearch TPE331 engine is based on the static sea level standard conditions with no external accessory loads and no air bleed. NOTE 3. Current weight and balance data, including a list of equipment included in the certificated empty weight and loading instructions, when necessary, must be provided at the time of airworthiness certification for return to service. **FAA FORM 8110-2-1 (10-69) PAGE 5 OF 5 PAGES FAA AC 73-2651** ## Every issue (1) - April 18, 1980: Issued, Current. [certificate](https://openairdocs.org/files/sha256/33/cc/33ccfb839c5c5de9e4cdcd074157fb445f310c30eb70e45e0065897a00d2d05e) --- 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.