# STC SA2334WE - Type: Supplemental type certificate - Status: Current, Amended - Holder: Johnston Aircraft Service, United States - Description: Installation of Jacobs R755-A2M or R755-SM engine, JAS engine mount, Grumman SR-5404/MA96K-2 propeller and associated equipment. (A-9B RESTRICTED CATEGORY ONLY) - Applied: March 10, 1971 - Status date: May 19, 1972 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS A-758](https://openairdocs.org/tcds/A-758) - Certificate PDF: https://openairdocs.org/files/sha256/58/7d/587da87ef3522bceeea7c9e6551780604431c7b09f1e5f6358cdc2eb0ef541b3 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/64E9224C727516F885256CC200015CCB.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA2334WE ## ADs that name it (0) None. ## Approved models (2) - Aircraft Parts & Development Corp. A-9 ([TCDS A-758](https://openairdocs.org/tcds/A-758)) - Aircraft Parts & Development Corp. A-9B ([TCDS A-758](https://openairdocs.org/tcds/A-758)) ## 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: SA233447 This certificate issued to: Johnston AIICIaIt SeIVICE Purt 8 of the CIVI] ASI Regulations. Original Product - Type Certificate Numben: A-758 Make: AERO COMMANDER (Callaix) Model: A-9, A-9B (Restricted Category On1f) Description of Type Design Change: Installation of Jacobs R755-A2M or R755-SM engine, JAS engine mount, Grumman 30 March 1971. Aircraft Service Instructions #2 and Master Drawing List No. 130, both dated SR-3101/M49SK-2 propeller and associoted equipaent in accordance with Johneton See Continuation Sheets. Limitations and Conditions: This approval should not be extended to other specific airplanes of these models 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 airplane, permanent records for this modified A copy of this Certificate, STC Addendun No, SA2334WE, Service Instruction #2 dated 30 March 1971 shall be maintained as part of the Supplemental Type Certificate Addendum No. SA2334WE is a part of this Certificate. and Johnston Aircraft Date of Application: 10 MarCA 1971 Dule missued Date of Issuance: 9 April 1971 Date Amended: 19 MAY 1972 AVIATION Bry direction of the. Administrator ION cry chief, Aircraft Entigerine Division 47 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Shect) Number 51233445 Make: © April 1971 Amended: 29 MAY 1972 STC: SA2334W2 AERO COMMANDER A-9, A-98 (Restricted Category Only) Supplemental Type Certificate ADDENDUM NO. SA2334VE The conditions and limitations of Aircraft Specification No. A-758 apply except as follows: This STC Addendum, which is a part of Supplemental Type Certificate No. SA2334WE, 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 STC Addendun is required to be maintained as a part of the nodified aircraft's permanen: records. Supplemental Type Certificate Holder: Johnston Aircraft Service XII. -- Model A-9, A-9B, 1 PCLM (Restricted Category Only), as modified by STC SA2334VE. ENGINE: Jacobs R-755-A2M or R-755-SM FUEL: 80/87 Minimum Grade Aviation Gasoline ENGINE LIMITS: R-755-A2M engine For All Operations: 2200 RPM. (300 H.P.) R-755-SM engine Takeoff: Sea Level to 4000 ft., 2200 RPM @ 35.0" Hg (350 H.P.) 8000 It. 2200 RPM @ 30.0" Fg (290 H.P.) Straight line variation between points given. Maximum Continuous: Sea Level, 2030 RPM @ 30,3" Hg (275 H.P.) 12,000 ft., 2030 RPM @ 20.0" Hg (160 H.P.) Straight line variation between points given. PROPELLER AND Grumman SR-5404/MA96K-2 PROPELLER LIMITS: Hub Model: SR-5404 Blade Model: MA96K-2 Diameter: Maximum - 94 inches Minimum - 92 inches **FAA FORM 8110-2-1 (10-69) PAGE 3 OF 5 PAGES** 19 MAY 1972 SUPPLEME SAL TYPE CERTIFICATE ADDENDUM NO. SA2334VE (Continued) PROPELLER AND Pitch Setting at 36 inch Station - 13° (R-755-A2M engine) PROPELLER LIMITS: Pitch Setting et 36 inch Station - 15° (R-755-SM engine) (Continued) Static RPM: Maximum - 2100 RPM. Minimum - 2000 RPM. AIRSPEED LIMITS * Vne (never exceed) 105 mph. (CAS) : * Vno (max. structural cruising) 120 mob. # Vp (maneuvering speed) 108 mph. * Vie (flaps extended) 90 mph. OIL CAPACITY: 4,4 Gallons @ Station - 13,5 MAXIMUM OPERATING ALTITUDE: 12,000 feet POWERPLANT INSTRU- Tachometer: R-755-A2M engine, 2200 RPM. (Red Radiai) MENT MARKINGS: Tachometer: R-755-SM engine, 2200 RPM. (Red Radial) 2030 RPM to 2200 RPM (Yellow Arc) 1700 RPM to 2200 RPM (Green Arc) Manifold Pressure: (R-755-SM only) 35" Hg (Red Radial) 30.3" to 35" Ng (Yellow Arc) 15" to 30.3" Eg (Green Arc) 011 Teeperature ea 011 Temperature Gage: Maximum 200°F. (93°C.) (Red Radial) Maximum 90 psi. (Red Radial) Normal 60 to 90 psi. (Green Arc) Cylinder Head Temperature: (R-755-SM engine only) Maximum 500°F. (260°C.) (Red Radial) Fuel Pressure: R-755-A2M engine: Maximum 4 psi. (Red Radial) Normal 2,5 psi. to 4 psi. (Green Arc) Minimum 2.5 psi. (Red Radial) R-755-SM engine: Maximum 9 psi. (Red Radial) Normal 3 psi. to 9 psi. (Green Arc) Minimum 5 psi. (Red Radial) SERIAL NUMBERS A-9 - 1126 through 1263, 1265 and up. MIGIBLE: A-9B - 1306 and up. : NOTE 1, A current Weight and Balance Report including list of equipment included in certificated empty weight, and loading instructions when necessary, must be in the aircraft. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA2334WE Make: 9 April 1971 Amended: 29 MAY 1972 STC: SA2334WE AERO COMMANDER A-9, A-9E (Restricted Category Only) Supplemental Type Certificate ADDENDUM NO. SA2334WE (Continued) NOTE 2. The following placard must be installed in front of and in clear Giew of the pilot (R-755-5M engine only) : "ENGINE OPERATING LIMITS: TARZOFF: SEA LEVEL TO 4000 FT., 2200 RPM @ 35.0 IN. HO. (350 H.P.) 8000 FEET 2200 RPM @ 30.0 IN. EG. (290 H.P.) STRAICHT LINE VARIATION BETWEEN POINTS GIVEN, MAXIMUM CONTINUOUS: SEA LEVEL 2030 RDM @ 30,3 IN, HO. (275 H.P.) 12,000 FEET, 2030 RPM @ 20.0 IN. HG. (160 H.P.) **STRAIGHT LINE VARIATION BETWEEN POINTS GIVEN.** In eddition to the above placard, the prescribed operating limitations indicated by an asterisk (*) above must also be displayed by permanent markings. FAA FORM 8110-2-1 (10-69) This certificate may be transferred in accordance with FAR 21.17 PAGE 5 OF S PAGES ## Every issue (1) - May 19, 1972: Amended, Current. [certificate](https://openairdocs.org/files/sha256/58/7d/587da87ef3522bceeea7c9e6551780604431c7b09f1e5f6358cdc2eb0ef541b3) --- 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.