# STC SA3994NM - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Alloy Aerospace Inc, United States - Description: Installation of a cascade thrust reverser. - Applied: December 5, 1988 - Status date: February 3, 2017 - Product: Aircraft, Large Airplane - Certification basis: Part 21 - Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE) - Certificate PDF: https://openairdocs.org/files/sha256/c8/14/c8148c0b6a83fb7cc1ccb7dc27e443d9bc5ddb65b83877c19aec70c69f851759 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CF5B7DE275E3E5E4862581DA005F8E63.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA3994NM ## ADs that name it (0) None. ## Approved models (5) - The Boeing Company 727 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727-100 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727-100C Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727-200 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727C Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) ## 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. 6921 FARMDALE AVENUE NORTH HOLLYWOOD, CALIFORNIA 91605 Part 4b of the Civil Air Regulations. A3WE **BOEING** 727, 727C, 727-100, -100C, -200 Description of Type Design Change: Installation of a cascade th rust reverser in accordance with Aviation Equipment, Inc., Master Drawing List 33- 1000 Revision “B”, dated May 10, 1989, or later FAA approved revisions. Limitations and Conditions : This approval should not be extended to other specific aircraft of the se 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 those aircraft. The approval of modifications applies to the above -noted aircraft model series only. I f 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. This certificate and the supporting data, which is the basis 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 5, 1988 Date of issuance: May 30, 1989 Date reissued: May 15, 1996, November 6, 1997, January 18, 2013, February 3, 2017 Date amended: February 21, 1990, November 13, 1995, May 9, 1996 By direction of the Administrator (Signature) Steve Bogucki Manager, Technical Support & Administrative Support Los Angeles Aircraft Certification Office (Title) NOTE: **DO NOT DELETE THIS PAGE.** **DO NOT ADD ANY DATA TO THIS PAGE.** **THIS PAGE IS FOR PAGE NUMBERING PURPOSES, PLEASE DISCARD PRINTED COPY.** Number ## Every issue (3) - February 3, 2017: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/c8/14/c8148c0b6a83fb7cc1ccb7dc27e443d9bc5ddb65b83877c19aec70c69f851759) - January 18, 2013: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/ad/43/ad43ab367a795a848ff074db3c6e8d5b64fe1d85524ba560e1d1280a18c3b07c) - February 1, 2006: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/a7/53/a753ac90b4c7f5373e2709d166cb1a9dde78465f26bb461a38bbbea2b2a7dca3) --- 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.