# STC SA4956NM - Type: Supplemental type certificate - Status: Current, Amended - Holder: American Aviation Inc, United States - Description: OPTION 1: Installation of American Aviation intercooled engines as modified by STC SE4159NM. OPTION 2: This installation with the cowl scoops only. - Applied: August 7, 1987 - Status date: November 1, 1998 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE) - Certificate PDF: https://openairdocs.org/files/sha256/aa/00/aa00b1dd290c1b72f199376275996f65ffd8bbd4eb40bc87d5d1a8c9cfc9a88c - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F4D2BF2A8363159D85256CC2000E3FF0.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA4956NM ## ADs that name it (0) None. ## Approved models (2) - Cessna Aircraft Company 414 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 414A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) ## 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: SA4956NM This certificate issued to: American Aviation, Inc. 10555 Airport Drive Coeur d'Alene Airport Hayden Lake, ID 83835 Part 3 of the Civil Air Regulations, effective May 15, 1956. Original Product -Type Certificate Number: A7CE Make: Cessna Model: 414 and 414A Description of Type Design Change: Option 1; Installation of American Aviation, Inc., intercooled engines as modified by Supplemental Type Certificate (STC) SE4159NM in accordance with American Aviation, Inc., Model 63-2 Top Drawing List, Rev. A, dated December 20, 1990, or later FAA approved revision. A copy of American Aviation, Inc., FAA approved Airplane Flight Manual Supplement (AFMS) dated July 11, 1990, or later FAA approved revision must be carried in the modified aircraft. Option 2; This installation with the cowl scoops only, in accordance with American Aviation Model 63-2 Drawing List, Rev. F, dated May 6, 1993, or later FAA approved revision. No AFMS is necessary for this installation only. NOTE: This approval includes Cessna 414 aircraft previously modified per the following ST's: SA2354SW, SA4379SW, SA4546SW, SA4943SW, SA5998SW, SA7463SW and SA7570SW. 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 of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate and FAA approved AFMS 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. Date of Application: August 7, 1987 Date Reissued: Date of Issuance: July 31, 1990 Date Amended: 01/25/91; 05/21/93; 11/01/98 FEDERAL SIATION irection of the Administra dran мит (Signature) TOMINIST RATION Acting Manager, Seaftle Aircraft Certification Office (Title) ## Every issue (1) - November 1, 1998: Amended, Current. [certificate](https://openairdocs.org/files/sha256/aa/00/aa00b1dd290c1b72f199376275996f65ffd8bbd4eb40bc87d5d1a8c9cfc9a88c) --- 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.