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Note: Below you will find PDF copies of our informational brochures, maintenance manuals, STC's and more. Every effort is made to ensure the documents here are the most up-to-date versions available, but please feel free to contact us to verify if you have any questions.

Clicking any button will open the document in a new tab on your browser, if you wish to save a local copy just right-click on the button and choose the Save link as... option.

Supplemental Type Certificates

Bell STCs

Sikorsky STCs

Note: Click on any of the listed titles to open them in a new browser tab, or right-click and choose the Save link as… option to save a copy to your own device.

McDonnell Douglas STCs

Global Spar STCs

Customer Resources

Mechanical Specialties would love to be your #1 source for cargo hooks, custom fast-rope gantries, hook overhauls and any specialty engineering issues you may need to overcome. Our in-house design and manufacturing capabilities are robust and we enjoy challenges.

New customers, please download and complete the New Customer Set Up Form and email to so we can set up your account.

If you have sales, service, or engineering inquiries, use our online contact form.