Helicopter Crewseat Cushion Program
Abstract
A large proportion of Army helicopter pilots suffer back pain caused by flying. Extended missions required during Desert Shield/Desert Storm emphasized this problem. This pain could have an adverse impact on operational readiness, crew effectiveness, and flight safety. Poor posture during flight has been a contributing factor in pilot lower back pain. This program was performed to develop a seat cushion that improves comfort and reduces the incidence of lower back pain without adversely affecting crashworthiness. A literature survey and fact finding study analyzed the problem as it relates to AH-64 pilots. The knowledge and design, however, should be useful in all helicopters, especially in those with crashworthy stroking seats such as the UH-60 and AH-64 and in the future, the Comanche. Conceptual designs were developed which could help alleviate the problem. A survey of materials identified a few foams which were best suited to satisfy most of the requirements identified. Additional laboratory testing of foams was conducted to better compare the final candidates and aid in determining the optimal thickness and density to be used for the bottom cushion. A fit and function evaluation determined appropriate size and range of adjustment required for each postural/comfort aid (thigh, lumbar, and arm support). Prototype cushions were designed and fabricated and were used in dynamic crash test and in an Army-conducted comfort evaluation. Final design modifications were made prior to fabricating the twelve deliverable cushion assemblies. Seat comfort, Aircrew posture, Arm support, Lumbar lordosis, Seat cushions, Lumbar support, Energy absorbing foam, Lumbar kyphosis, Back pain, Thigh support, Helicopter vibration, Helicopter seating.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1994
- Accession Number
- ADA286654
Entities
People
- Ricky L. Greth