# STC SA4-977 - Type: Supplemental type certificate - Status: Current, Amended - Holder: Univair Aircraft Corporation, United States - Description: Installation of Fiberglass rudder post mount for either Grimes or Whelen WRM rotating beacons. - Applied: June 9, 1959 - Status date: October 6, 2005 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: [TCDS 1A1](https://openairdocs.org/tcds/1A1), [TCDS 1A2](https://openairdocs.org/tcds/1A2), [TCDS 1A4](https://openairdocs.org/tcds/1A4), [TCDS 1A6](https://openairdocs.org/tcds/1A6), [TCDS 2A8](https://openairdocs.org/tcds/2A8), [TCDS A-691](https://openairdocs.org/tcds/A-691), [TCDS A-780](https://openairdocs.org/tcds/A-780), [TCDS A-797](https://openairdocs.org/tcds/A-797), [TCDS A-800](https://openairdocs.org/tcds/A-800), [TCDS A-805](https://openairdocs.org/tcds/A-805) - Certificate PDF: https://openairdocs.org/files/sha256/ff/4f/ff4f62c8ed556ff2856724695555b7b3cd1f8fcc527be33f18d09161a19b56ab - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3A680AF096AC99458625709A00683E85.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA4-977 ## ADs that name it (0) None. ## Approved models (11) - The New Piper Aircraft Inc. PA-11 ([TCDS A-691](https://openairdocs.org/tcds/A-691)) - The New Piper Aircraft Inc. PA-12 ([TCDS A-780](https://openairdocs.org/tcds/A-780)) - The New Piper Aircraft Inc. PA-14 ([TCDS A-797](https://openairdocs.org/tcds/A-797)) - The New Piper Aircraft Inc. PA-15 ([TCDS A-800](https://openairdocs.org/tcds/A-800)) - The New Piper Aircraft Inc. PA-16 ([TCDS 1A1](https://openairdocs.org/tcds/1A1)) - The New Piper Aircraft Inc. PA-17 ([TCDS A-805](https://openairdocs.org/tcds/A-805)) - The New Piper Aircraft Inc. PA-18 ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - The New Piper Aircraft Inc. PA-19 (Army L-18C) ([TCDS 1A2](https://openairdocs.org/tcds/1A2)) - The New Piper Aircraft Inc. PA-20 ([TCDS 1A4](https://openairdocs.org/tcds/1A4)) - The New Piper Aircraft Inc. PA-22 ([TCDS 1A6](https://openairdocs.org/tcds/1A6)) - The New Piper Aircraft Inc. PA-25 ([TCDS 2A8](https://openairdocs.org/tcds/2A8)) ## 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: SA4-977 This certificate issued to: Univair Aircraft Corporation 2500 Himalaya Road Aurora, CO 80011 Part * of the * Regulations. Original Product Type Certificate Number: * Make: Piper Model: * Description of Type Design Change: Installation of Fiberglass rudder post mount, for either Grimes or Whelen Model WRM Rotating Beacons in accordance with Drawings Nos. AW59-3, AW59-4 and Installation Instructions No. 23. 1. Compatibility of this design change with previously approved modifications must be determined by the installer. 2. 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: June 9, 1959 Date Reissued: 11/22177, July 14, 2005 Date of Issuance: November 25, 1959 Date Amended: 7/17/61, 11/18/65, 7/14/05, October 6, 2005 FEDERAL AVIATION By Direction of the Administrator Melissa Sandoy (Signature) TOMINIST RATION Small Airplane Program Manage Northwest Mountain Region Denver Aircraft Certification Office (L'itle) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA4-977 Issued to: Univair Aircraft Corporation Date of Issuance: 11/22/77, 7/14/05 Date Amended: 7/17/61, 11/18/65, 7/14/05, October 6, 2005 Limitations and Conditions: continued: This continuation sheet is part of Supplemental Type Certificate No. SA4-977. A copy of this sheet shall be maintained as part of the modified aircraft permanent records. Piper Aircraft Model Type Certificate No. Certification Basis PA-11 691 CAR 4a PA-12 780 CAR 3 PA-14 797 CAR 3 PA-15 800 CAR 3 PA-16 1A1 CAR 3 PA-17 805 CAR 3 PA-18 Series 1A2 CAR 3 PA-19 1A2 CAR 3 PA-20 Series 1A4 CAR 3 PA-22 Series 1A6 CAR 3 PA-25 2A8 CAR 3 - END - Any alteration of this certificate is punishable by a fine of not exceeding $1,000, or imprisonment not exceeding 3 years, or both FAA Form 8110-2(10-68) Dana 3 nf 2 Danac ## Every issue (2) - October 6, 2005: Amended, Current. [certificate](https://openairdocs.org/files/sha256/ff/4f/ff4f62c8ed556ff2856724695555b7b3cd1f8fcc527be33f18d09161a19b56ab) - July 14, 2005: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/66/6d/666d3e72d88ff137824e4f5fe46f163cb77de953fe220748a435d645175f7b31) --- 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.