# STC SA00556DE - Type: Supplemental type certificate - Status: Current, Issued - Holder: Heliarc Welding Service Inc., United States - Description: Installation of a left-hand exhaust stack assembly. - Applied: July 9, 2003 - Status date: September 23, 2004 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: [TCDS 3A10](https://openairdocs.org/tcds/3A10), [TCDS 3A25](https://openairdocs.org/tcds/3A25), [TCDS A25CE](https://openairdocs.org/tcds/A25CE), [TCDS A7CE](https://openairdocs.org/tcds/A7CE) - Certificate PDF: https://openairdocs.org/files/sha256/05/f3/05f3da85ba9b83a27be84b8ce44eb2247201adb0487d262dd4099878b6f3c162 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/64D4760B3C1ABEC386256F380077CE9C.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA00556DE ## ADs that name it (0) None. ## Approved models (24) - Cessna Aircraft Company 320 ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 320A ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 320B ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 320C ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 320D ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 320E ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 320F ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 335 ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 340 ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 340A ([TCDS 3A25](https://openairdocs.org/tcds/3A25)) - Cessna Aircraft Company 401 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 401A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 401B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 402 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 402A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 402B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 402C ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 404 ([TCDS A25CE](https://openairdocs.org/tcds/A25CE)) - Cessna Aircraft Company 414 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 414A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company 421C ([TCDS A7CE](https://openairdocs.org/tcds/A7CE)) - Cessna Aircraft Company T310P ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company T310Q ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) - Cessna Aircraft Company T310R ([TCDS 3A10](https://openairdocs.org/tcds/3A10)) ## 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: SA00556DE This certificate issued to: Heliarc Welding Service, Inc. 3965 Newport Street Denver, Colorado 80207 * See Approved Model List (AML) Document No. HWS-AML-SA00556DE, FAA Approved September 23, 2004, or later FAA Approved Revision. Make: * See AML Model: Description of Type Design Change: Installation of a left-hand exhaust stack assembly modified for increased cowling clearance on Cessna aircraft in accordance with Heliarc Welding Service, Inc. Drawing No. 0910295-13-FCL, Revision 0, dated 7/25/03 and the Installation Instructions as defined in the AML. 1. Compatibility of this design change with previously approved modifications must be determined by the installer. 2. For Instructions for Continued Airworthiness refer to normal inspection requirements provided by the respective Cessna Maintenance/Service Manual. 3. 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. HWS-A Instructions for Continued Airworthiness Not Applicable FAA APPROVED MODEL LIST (AML) No. HWS-AML-SA00556DE Installation of Heliarc Welding Service, Inc, Left-Hand Exhaust Stack Assembly Part Number HWS-9910295-13FCL Revision Date Rev. Original, dated July 22, 2004. For STC SA00556DE Document Heliarc Welding Service LH Exhaust Stack Assembly Modified for Forward Riser Cowling Clearance Page 1 of 2 Certification Basis for Alteration CAR 3 FAR Part 23 CAR 3 FAR Part 23 CAR 3 FAR Part 23 CAR 3 FAR Part 23 CAR 3 FAR Part 23 Original Type Certificate Number ЗА10 3А25 3А25 3A25 A7CE Aircraft Model T310P, Q, R 320, A, B, C, D, E, F 335 340, А 401, А, B Aircraft Make Cessna Cessna Cessna Cessna Cessna Item .-SA00556DE Revision Original Make: September 23, 2004 AML Amendment Date AML No. HWS-A Installation Instructions Instructions Revision for Continued Airworthiness Date Rev. Original, Not Applicable dated July 22, 2004. Melisa dow Melissa Sandow, Small Airplane Program Manager Denver Aircraft Certification Office September 23, 2004 Document Heliarc Welding Service LH Exhaust Stack Assembly Modified for Forward Riser Cowling Clearance --- End of List --- FAA Approved: Make: Page 2 of 2 Certification Basis for Alteration CAR 3 FAR Part 23 FAR Part 23 CAR 3 FAR Part 23 CAR 3 FAR Part 23 Original Type Certificate Number A7CE A25CE A7CE A7CE Aircraft Model 402, A, B, C 404 414, A 421C Aircraft Make Cessna Cessna Cessna Cessna Item ## Every issue (1) - September 23, 2004: Issued, Current. [certificate](https://openairdocs.org/files/sha256/05/f3/05f3da85ba9b83a27be84b8ce44eb2247201adb0487d262dd4099878b6f3c162) --- 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.