For transport category airplanes, a 16g seat is one that meets the 9g requirements of Sec. 25.561 and the dynamic requirements of Sec. 25.562.
A 16g seat is tested in a manner that simulates the loads that could be expected in an impact-survivable accident. Two separate dynamic tests are conducted to simulate two different accident scenarios: [...]
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Seat Primary Load Path – The components within the seat that carry the load from the
point of load application to the structure that reacts the load from the seat system or sub-
system. The primary load path may be segmented into its discrete elements, depending
on the parameter being evaluated, as follows:
Structural: from seat belt to fittings [...]
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Similar Design Philosophy – A design which uses the same:
Method of construction and manufacturing process (for example, machin
versus built-up part),
Detail part materials (for example, alloys or heat treat),
Load path,
Geometry, including section properties, except for minor differences resulting
from space limitations within the seat or aircraft interface, and
Attachment method, except for minor differences resulting from space
limitations within [...]
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Posted in Aircraft Systems Terms, FAA Terms | Tagged 16G, Aircraft, Airline, Engineering, FAA, Seats
Instability Failure – An instantaneous loss of the load-carrying capability of a structural member (for example, the collapse of a column). – AC 25.562-1B
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Occupant Position – The static relationship of the occupant relative to fixed points on the seat. This is assessed using the Seat Reference Point (SRP), as defined in Society of Automotive Engineers Aerospace Standard AS8049 Revision A. – AC 25.562-1B
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Rational Analysis – An analysis based on good engineering principles, judgment, and/or accepted methodology. This can include, but is not limited to, static/dynamic load comparison, static strength analysis, comparative static/dynamic strength analysis, linear static and non-linear finite element analysis, and inspection. – AC 25.562-1B
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Energy Absorber Bottom-Out – The energy absorber bottoms out when it reaches its maximum stroke and no longer provides an energy absorption function. – AC 25.562-1B
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Energy Absorber Rating – The load required to actuate the energy-absorbing device. The highest rated energy-absorbing device would be the device that requires the highest load to initiate. – AC 25.562-1B
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Posted in Aircraft Systems Terms, FAA Terms | Tagged 16G, Aircraft, Airline, Engineering, FAA, Seats
Family of Seats – A group of seat assemblies, regardless of the number of seat places, built from equivalent components in the primary load path. See paragraph 4c and Appendix 3 for an expanded discussion. in- AC 25.562-1B
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Baseline Testing The initial series of tests performed as part of the original certification to substantiate that a family of seats meets regulatory requirements. – AC 25.562-1B
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Posted in Aircraft Systems Terms, FAA Terms | Tagged 16G, Aircraft, Airline, Engineering, FAA, Seats
