A Review of Push-pull Effect in Canadian Forces Aircraft Accidents: 1976-1995
DEFENCE AND CIVIL INST OF ENVIRONMENTALMEDICINE DOWNSVIEW (ONTARIO)
Pagination or Media Count:
Push-pull effect has been defined as decreased Gz tolerance resulting from preceding relative -Gz. It has been identified in laboratory and in-flight studies, but little is known about the operational incidence of push-pull effect within the Canadian Forces CF. In order to enhance our knowledge, a review of CF Boards Of Inquiry BOIs, Aircraft Accident Incident Reports AAIR and Flight Safety Summary Investigations FSII was initiated to determine if push-pull effect was causal in any previous aircraft accidents. A total of 284 CF jet and trainer accidents were reviewed of which 95 were A category. Eighteen were selected for detailed review all A category, from which five accidents were identified as involving, or possibly involving, push-pull effect. The results of this study suggest that that push-pull effect was a probable or possible cause factor in at least five CF aircraft accidents and two CF aircraft incidents over 20 years from 1976 to 1996. Research into methods to protect against the push- pull effect is continuing at DCIEM. This report is being circulated in accordance with a recommendation from the accident that occurred in July 1995 in Cold Lake, which was to promote education of the CF Fighter community on the hazards and insidious nature of the push-pull effect. The results of this study should be made widely available in order to continue that effort.
- Military Aircraft Operations
- Stress Physiology