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3.2 Engineering
Product Design. Arrowhead Products’ engineering department averages more than 30
years of aircraft air ducting, flexible joint, and insulation system design experience per
person including the design and manufacture of composite ducting.
Departmental capabilities include the following:
(a.) Ducting system and component design capability utilizing Autocad
Mechanical Desktop V6 and CATIA V4.2 & V5 software.
(b.) Ducting system analysis capability using customized finite-element analysis
methodology for flexibility, deflections, loads and stress, modal and dynamic
analysis.
(c.) Flexible joint and component design utilizing Nastran finite element analysis.
(d.) Ducting system and component pressure drop analysis.
(e.) Material and process evaluation for non-metallic and metallic materials.
(f.) Weight and balance analysis.
(g.) Heat transfer analysis.
(h.) Data import/export via ftp protocols, encryption capable.
Materials and Processes Laboratory. Arrowhead Products has a fully equipped
metallurgical laboratory capable of all testing required to support its product line, including
materials testing and monitoring of pertinent manufacturing process. This laboratory
supports any failure analysis activities, metallurgical evaluations, and is involved in ongoing
high and low cycle bellows fatigue testing.
3.2.1 Engineering Specialities
Arrowhead Products specializes in solutions for ducting system applications. In providing
these solutions, a core-competency has been developed, focused around the following
specialties:
(a.) System analysis utilizing the latest analysis tools. This enables an in-depth
understanding of the behaviour of the system which allows for a more
effective design approach.
(b.) Bellows design capability. Design capabilities are based on years of testing
correlated to empirically derived and modified design rules. The bellows
element is a fundamental feature in any duct system.
(c.) Flexible Joint design capability. Selection and design of gimbal joints, bellows
ball joints, tie-rod type joints, compensators, and other types of joints is a
specialty of Arrowhead Products.
There are no capabilities, requirements or specialties required for this program that are not
in place at Arrowhead’s Los Alamitos facility.
3.2.2 Design Approach
The design approach with respect to trade studies and policies concerning new versus
existing technology, methods and materials is to evaluate the benefits and costs of each
new item, comparing against those existing, and weigh any benefit against risk to both the
master program schedule and certification requirements. Arrowhead Products considers the
master program schedule (MPS) to be “cast-in-stone” and any new item must offer minimal
risk to qualification/certification and schedule to be considered.
3.2.3 Product Testing & Qualification
Arrowhead Products has a 25,000 square foot, fully equipped test laboratory capable of
conducting the following tests in support of product development, product qualification and
certification:
(a.) Static testing, pressure and temperature capable, instrumentation with load
cells, strain gages, thermocouples and data acquisition systems.
(b.) Low and high cycle fatigue testing.
(c.) Vibration testing, sine, random, sine on random, gun-shot, and shock
capabilities.
(d.) Flow and pressure drop testing.
(e.) Cryogenic to high temperature testing, loads and pressures.
(f.) Helium leak testing.
For any test requirements beyond our in-house capabilities, Arrowhead has several local
test laboratories readily available, including Wyle Laboratories (El Segundo, CA), Garwood
Laboratories (Downey, CA) and National Technical Systems (NTS-Saugus, CA).
Support of the certification efforts has included both contracted and delegated conformity
inspections, and support of contracted and customer Designated Engineering
Representative witness of qualification test programs.
Arrowhead’s participation in the certification process has consisted of preparation of
hardware qualification test procedures and reports, and providing all necessary technical
support to the delegated inspection and engineering representatives.
Arrowhead Products enjoys excellent relations with the local Manufacturing Inspection
District Office of the Federal Aviation Administration, and a major audit performed within
the last two years by that office was completed without findings requiring corrective action.
3.3 Manufacturing Engineering
Manufacturing Engineering is responsible for developing and communicating the
manufacturing plan through tool concepts and the manufacturing routing and process
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