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Aircraft Design Considerations to Meet One Engine Inoperative (OEI) Safety RequirementsCommercial airlines are obligated to operate such that an aircraft can suffer an engine failure at any point in its mission and terminate the flight without an accident. Only minimal aircraft damage is allowable, such as brake replacement due to very heavy application, or an engine inspection and/or possible removal due to use of an emergency rating. Such performance criteria are often referred to as zero exposure, referring to zero accident exposure to an engine failure. The critical mission segment for meeting one engine inoperative (OEI) criteria is takeoff. For a given weight, wind, and ambient condition, fixed wing aircraft require a balanced field length. This is the longer of the distance to take off if an engine fails at a predetermined critical point in the takeoff profile, or the distance to reject the takeoff and brake to a stop. Rotorcraft have requirements for horizontal takeoff procedures that are equivalent to a balanced field length requirements for fixed wing aircraft. Rotorcraft also perform vertical procedures where no runway or heliport distance is available. These were developed primarily for elevated heliports as found on oil rigs or rooftops. They are also used for ground level operations as might be found at heliports at the end of piers or other confined areas.
Document ID
20120016833
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Scott, Mark W. (Sikorsky Aircraft Corp. Stratford, CT, United States)
Date Acquired
August 26, 2013
Publication Date
August 1, 2012
Subject Category
Air Transportation And Safety
Report/Patent Number
ARC-E-DAA-TN5707
NASA/CR-2012-216037
Funding Number(s)
CONTRACT_GRANT: NAS2-01065
Distribution Limits
Public
Copyright
Public Use Permitted.

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