# STC SA1464NM - Type: Supplemental type certificate - Status: Current, Amended - Holder: Aero Air, LLC, United States - Description: Installation of Hartzell HC-B3TN-5NL/LT propellers on TPE331-5-252K engines (installed per STC SA1024SO) and AiResearch TPE331-5-251K and TPE331-5-254K engines. - Applied: December 23, 1981 - Status date: January 14, 2004 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 3, Part 21 - Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4) - Certificate PDF: https://openairdocs.org/files/sha256/2d/10/2d10e3a473b05ef78aafdcc4dbf6e40ff6f5d7ed1a13eae2f5689db569e439da - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/04003B30C13DFB6186257ACC00761FF1.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA1464NM ## ADs that name it (0) None. ## Approved models (4) - Twin Commander Aircraft Corporation 690 ([TCDS 2A4](https://openairdocs.org/tcds/2A4)) - Twin Commander Aircraft Corporation 690A ([TCDS 2A4](https://openairdocs.org/tcds/2A4)) - Twin Commander Aircraft Corporation 690B ([TCDS 2A4](https://openairdocs.org/tcds/2A4)) - Twin Commander Aircraft Corporation 690C ([TCDS 2A4](https://openairdocs.org/tcds/2A4)) ## What the certificate says Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record. Number SA1464NM This certificate, issued to Aero Air, LLC 2050 NE 25th Ave. Hillsboro, OR 97124 Part 3 of the Civil Air Regulations. Original ProductType Certificate Number: 2A4 Make: Twin Commander Model: 690, 690A, 690B, 690C Description of the Type Design Change: Installation of two Hartzell HC-B3TN-5NL/LT propellers on Twin Commander aircraft equipped with two AiResearch TPE331-5-252K engines (installed per STC SA1024SO) or TPE331-5-251K or TPE331-5-254K engines, in accordance with Aero Air, Inc., Master Drawing List, dated December 23, 1981, or later FAA approved revision. Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. Airplanes equipped with this modification must be operated in accordance with FAA Approved Airplane Flight Manual/Pilot’s Operating Handbook Supplement, dated July 29, 1987, or later FAA approved revision. A copy of this Certificate, Continuation Sheet, and Airplane Flight Manual/Pilot’s Operating Handbook Supplement must be maintained as part of the permanent records for the modified aircraft. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission. (See Continuation Sheet - Page 3) This certificate and the supporting data which is the ba sis for approval shall remain in effect until surrendered, suspended, revoked, or a termination date is otherwise established by the Administrator of the Federal Aviation Administration. Date of application: December 23, 1981 Date reissued: 2/20/97; 9/25/98 Date of issuance: February 19, 1982 Date amended: 2/21/97; 9/25/98; 1/14/04 (Signature) Acting Manager, Seattle Aircraft Certification Office (Title) Number SA1464NM Aero Air, LLC Amended: 2/21/97; 9/25/98; 1/14/04 Reissued: 2/20/97; 9/25/98 The conditions and limitations of Type Certificate Data Sheet 2A4 apply except where superseded by the following: This Supplemental Type Certificate Data Sheet, which is part of STC SA1464NM, prescribes the conditions and limitations under which this installation meets the airworthiness requirements of the Civil Air Regulations. XII, XIV XV, XVI Twin Commander Models 690, 690A, 690B, and 690C (Normal Category) modified February 21, 1982. Propellers and Propeller Limits: Hartzell HC-B3TN-5NL/LT10673B-2Q Pitch settings at 30” Station: Low 13.5, + 0.2 deg Feather 90 + 0.5 deg, Reverse -8 + 0.5 deg No other changes to TCDS 2A4 - END - **FAA FORM 8110-2- 1 (10-69) PAGE 3 OF 3 PAGES** ## Every issue (2) - January 14, 2004: Amended, Current. [certificate](https://openairdocs.org/files/sha256/2d/10/2d10e3a473b05ef78aafdcc4dbf6e40ff6f5d7ed1a13eae2f5689db569e439da) - September 25, 1998: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/24/eb/24ebcc4e6c9684ca3052122de6e4cad369ef30c884870a19e465b9c5a4de1a3b) --- 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.