By ARMY MATERIEL COMMAND ALEXANDRIA VA

This 1972 quantity, the 3rd part of a three-part sequence, is meant to set forth particular layout criteria for military helicopters, to set up qualification specifications, and to supply technical tips to helicopter designers in either the and in the military. This instruction manual defines the necessities for airworthiness qualification of the helicopter and for demonstration of agreement compliance, and in addition describes the try out approaches complete via the military.

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Extra resources for Engineering Design Handbook - Helicopter Engineering, Part Three - Qualification Assurance:

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To maintain a positive record of the configuration which is being proposed for analysis and testing 4. To establish a basis for updating and identifyiGg parts which pass or fail the qualification tests 5. To provide a foundation for an audit trail of all airworthiness substantiating actions. 3 MOck-ups The specifications for the mock-ups required by the RFP will be included in the AQS. See Chapter 5 for a detailed discussion of mock-ups. 4 Procurement and Process Specifications In order for the procuring activity to maintain cognizance over the detail configurations for which airworthiness substantiation is desired, review of certain pertinent drawings and approval of procurement specifications of contractor-furnished equipment (CFE) components are essential.

HAZARD TOTEM POLE I 1 HAZARD SIGNIFICANCE RANKING’ CODE COMBINATION* > ab 25 2 2 Y= $o a= wg & & J P Q a 1 2 A A J 1 NUMBER OF HELICOPTER HAZARDS 3 i\IONE 3 A K P 1 4 B J P 5 A A J 6 7 A L R Q P 16 7 NONE K 4 to document corrective actions for operations that are planned divergencies from the normal operational mode. This technique requires the safety analyst to be familiar with the detailed functional systems of the helicopter. 2 The purpose of fault tree analysis is to establish the probability of occurrence of the hazard.

At the apex of the tree, the undesired event is identified. Working from this apex a net of all events which contribute to the hazardous condition is constructed. Each event that may cause such a condition is assigned to a failure rate and an “Undetected Fault Time”, which is the duration of the time a fault condition exists undetected in a system. Failure rate need not be a constant value but varies with the activity being performed or the stress levels encountered. For example, an engine is subject to more failures at maximum power than at idle.

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