Summary: Design and Manufacturing of redundant servo-tab for installation on DHC-3 Otter for Airworthiness Directive (AD).
Client: VAZAR
Client Request: The DHC-3 Otter had a history of failures in the elevator servo-tab bellcrank. VAZAR agreed to address this issue on their turbine conversion to increase safety of the aircraft and meet the newer 23.629 requirement of flutter free after a single failure. Volant Technica was asked to develop the fix for the servo tab.
Project Summary: Volant Technica, (a precursor company to Fliegen Works,) worked with the FAA to address this service difficulty and produced the design data, developed loads and a structural test proposal, then DER witnessed the structural test. We also wrote the flight test plan and helped with the issuance of the TIA. The STC is a method of compliance to AD 2004-05-01. Fliegen Works currently holds PMA for fabrication of the redundant servo tab. that includes a 2nd control rod and other modification to fix in-service failure problem.
Results: STC SA01059SE was granted to VAZAR (as American Aeromotives) and is licensed to Fliegen Works for manufacture under PMA PQ2380NM.
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Summary: Field approval of external handle and personnel anchorage on MD 369E.
Client: Wilson Construction Company
Client Request: The linemen working from a rotorcraft needed a handle with an anchor point for their safety harness.
Project Summary: We provided design, detail drawings, structural substantiation, as well as a rotorcraft flight manual supplement –(RFMS). This included enough data for a coordinated field approval with the assistance of Dave Swan.
Results: Multiple 337 approvals to install handle on helicopters owned by the client.
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Summary: Rudder Tab certification
Project Name: Rudder Tab On A-1 Series Blimps
Client: American Blimp Company
Client Request: The client requested a fix to balance the aerodynamic torque created by an installed Lightsign on the left side of the blimp’s envelope.
Project Summary: We did the preliminary sizing and worked with ABC on the detail design. Fliegen Works developed the aerodynamic loads, produced a structural test proposal and then DER witnessed the tests. The design of a fixed tab on a Rudder of ABC A-1 series airship was a challenge since a number of engineering estimations were made. From minimal available blimp flight and aerodynamic data and old NACA data an analysis was performed to design a fixed rudder tab that biased the rudder to compensate for the unsymmetrical drag on the airship due to the Lightsign on one side of the airship. This was a major change to the type design by the type certificate holder.
Results: Successful flight testing, installation and approval of rudder tab on A-1 series blimp. Pilot force required to maintain straight flight reduced acceptable levels. Rather than complex CFD a simple method combined with a little guesswork was applied. Minimal time and cost was required to produce the required results in this manner.
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