Methods For Determining The Seat Reference Point Srp And The Buttock Reference Point Brp For Seats In Transport Aircraft Civil Rotorcraft And General Aviation Aircraft PDF Download

This procedure provides a method of determining a benchmark SgRP position for adjustable Driver's seats in Class A vehicles where the design intent information is not available. Class A vehicles include passenger cars, multipurpose passengervehicles, and vans with Seat Heights (H30) greater than 127 mm and less than 405 mm for the purposes of this document. Once the Driver's Seat Benchmark SgRP is determined other seating positions can be readily benchmarked based on the standard procedures.This document references installation procedures using the SAE J826 H-point Machine. If desired the document can be adapted to use the HPM-II by substituting the appropriate SAE J4002 instatllation procedures. In that case, the use of the HPM-II should be clearly documented. Since the SgRP is the basis for many interior benchmark dimensions this information can be used to assess or compare vehicle interiors in a standard repeatable way based on the packaging limitations of the property. This document provides a procedure for determining a benchmark SgRP for vehicles where design intent information is unknown. This procedure was developed using modified procedures from the SAE J4003 OCT2008 document for determining H-point in benchmark vehicles using the HPM II as well as procedures from the SAE J1516 DEC1998 document regarding accommodation tool reference point.Specific elements included in the Benchmark SgRP document: Modifications of the SAE J4003 procedure account for physical installation differences between the HPM I and HPM II in the cushion pan, back pan and leg assemblies. Modifications of the SAE J1516 document account for the SAE recommended practice using the BOFRP located on the shoe rather than the BOF reference located on the pedal introduced in SAE J4002. Procedures are included for the setup and alignment of the vehicle. Procedures are included to account for changes in the cushion angle that occur in seats with independent lift and tilt mechanisms. Procedures are included for determining the H-point travel box.