# STC SA957NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Sierra Industries Ltd., United States - Description: Installation of RCA digital weather radar system. - Applied: January 29, 1980 - Status date: July 31, 2017 - Product: Aircraft, Small Airplane - Certification basis: Part 3, Part 21 - Data sheets: [TCDS 3A13](https://openairdocs.org/tcds/3A13) - Certificate PDF: https://openairdocs.org/files/sha256/b0/0c/b00c0618b251ac912b827d2ddd5775fbc5e712e8f0d775d3a99cd3010dae2c5a - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/734353DD6A13F1018625871F0008AAC8.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA957NW ## ADs that name it (0) None. ## Approved models (6) - Textron Aviation Inc. 182P ([TCDS 3A13](https://openairdocs.org/tcds/3A13)) - Textron Aviation Inc. 182Q ([TCDS 3A13](https://openairdocs.org/tcds/3A13)) - Textron Aviation Inc. 182R ([TCDS 3A13](https://openairdocs.org/tcds/3A13)) - Textron Aviation Inc. R182 ([TCDS 3A13](https://openairdocs.org/tcds/3A13)) - Textron Aviation Inc. T182 ([TCDS 3A13](https://openairdocs.org/tcds/3A13)) - Textron Aviation Inc. TR182 ([TCDS 3A13](https://openairdocs.org/tcds/3A13)) ## 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. FAA Form 8110-2 (5/14) Page 1 of 3 Reissued on July 31, 2017 to supersede the original STC, which has been lost or misplaced. Number: SA957NW Part 3 of the Civil Air Regulations, effective November 1, 1949 as amended by 3-1 through 3-12. Original Product – Type Certificate Number: 3A13 Make: Cessna Model: 182Q, R182, TR182, 182P, 182R, T182 Installation of RCA digital weather radar system in accordance with Robertson Aircraft sealed Drawing List No. 81. Date of Application: January 29, 1980 Date Reissued: 11/8/84; 10/10/86; 9/8/05; 7/31/17 Date of Issuance: June 16, 1980 Date Amended: 11/12/80; 1/21/83 Signature Title Jim Grigg Manager, Fort Worth A CO Branch, Compliance & Airworthiness Division Sierra Industries, Ltd. 122 Howard Langford Drive Uvalde, TX 78801 FAA Form 8110-2 (5/14) Page 2 of 3 Transfer the ownership of Supplemental Type Certificate Number: SA957NW To (Name and address of transferee) From (Name and address of grantor) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA957NW FAA Form 8110-2 (5/14) Page 3 of 3 Date of Issuance: June 16, 1980 Date Amended: January 21, 1983 Date of Reissuance: July 31, 2017 The approval of this change in type design applies basically to the above model aircraft only. 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 other type design changes or previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate shall be maintained as part of the permanent records for the modified aircraft. This installation requires the ailerons to be rebalanced to within 0.0 to 3.0 inch-pounds leading edge heavy. The aileron rebalance must be accomplished in accordance with Robertson Aircraft Drawing 81 -300. -END- United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA957NW FAA Form 8110-2 (5/14) Page 4 of 3 ## Every issue (2) - July 31, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b0/0c/b00c0618b251ac912b827d2ddd5775fbc5e712e8f0d775d3a99cd3010dae2c5a) - September 8, 2005: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/64/c3/64c3fa3ed8f42acb5173ad20ce6842bf5bdcd10fba3cc6504d90cd1828788525) --- 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.