# STC SA4972NM - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Twin Otter International Ltd., United States - Description: Installation of 130 gallon auxiliary fuel tank in the passenger compartment. (DHC-6-300 restricted category) - Applied: July 16, 1990 - Status date: October 24, 2003 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 3, Part 21 - Data sheets: [TCDS A9EA](https://openairdocs.org/tcds/A9EA) - Certificate PDF: https://openairdocs.org/files/sha256/90/a3/90a36b47f771d15a6510eeb3fa5619c163f833cb9451b18df4adab6b7099dcba - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9A7F063E61DF3EBB862579C100799DB1.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA4972NM ## ADs that name it (0) None. ## Approved models (2) - Bombardier-Rotax GmbH DHC-6-300 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA)) - Viking Air Limited DHC-6-300 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA)) ## 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. Number SA4972NM This certificate, issued to Twin Otter International, Ltd. 4511 West Cheyenne Ave., Suite 500 North Las Vegas, NV 89032 Part 3 of the Civil Air Regulations. Original ProductType Certificate Number: A9EA Make : The de Havilland Aircraft of Canada Model : DHC-6-300 (Restricted Category) Description of the Type Design Change : Installation of 130 gallon auxiliary fuel tank in the passenger compartment in accordance with W. P. Jennings and Associates, Inc., Document Number WPJ-GEN-245, dated August 20, 1990, or later FAA approved revisions for the special purpose of Aerial Surveying. Limitations and Conditions : Data pertaining to this modification are considered inadequate for other aircraft. This approval is limited to the installation in de Havilland Model DHC-6-300 aircraft, Serial No. 650, R/N N55921, only. A copy of this Certificate, FAA approved Flight Manual Supplement, dated August 24, 1990, or later FAA approved revisions, must be maintained as part of the permanent records for the modified aircraft. The conditions and limitations of Type Certificate Data Sheet No. A9EA apply except where superseded by the following: Fuel Capacity: Auxiliary Fuel Tank Usable Fuel: 127 U.S. gallons Unusable Fuel: 1.8 U.S. gallons Maximum Operating Altitude: 15, 500 feet Date of application: July 19, 1990 Date reissued: October 24, 2003 Date of issuance: August 24, 1990 Date amended: October 24, 2003 (Signature) Acting Manager, Seattle Aircraft Certification Office (Title) ## Every issue (1) - October 24, 2003: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/90/a3/90a36b47f771d15a6510eeb3fa5619c163f833cb9451b18df4adab6b7099dcba) --- 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.