1 presented to: international helicopter safety symposium, september 26-29, 2005, montreal...
TRANSCRIPT
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Presented to: International Helicopter Safety Symposium, September 26-29, 2005, Montreal
Engineering Assumption versus Operational Reality: Repeated Lift Operation.
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Helicopters work in cycles
• For pleasure and corporate helicopters there are 4 cycles per hour.
• For heli-logging and firefighting there are 20 to 30 cycles per hour.
• Some manufacturers do not accept the facts of cycles nature.
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Heli-logging as part of Repetitive Lift Operations (RLO)
• Since the late seventies some helicopters have been dedicated to Repetitive Lift Operations (RLO) and there have been some significant accidents because of component malfunctions.
• During RLO operations there can be 10 times more events than anticipated as normal operations;
• There is a significant number of helicopters dedicated to RLO operations.
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Torque & Hook Weight over TimePleasure Flight & Anticipated Usage
Torque & Hook Weight over Time
%
100
80
60
40
20
0O 2 4 6 8 10 12 14 Time (min)
torque
Hook weight
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Torque & Hook Weight over TimeHeli-logging
% Torque & Hook Weight over Time100
60
40
20
025 50 75 100 125 150
Time (sec) torque
hook weight