seat structure load limitations 73-7
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seat structure load limitations 73-7
Hi,
I'm curious as to whether there's any structural load limitations regards weight per passenger seat, and does this vary from economy to business for example.
I know in the S300 (helicopter) we limit the cockpit to 600lbs but what about pax ops.
Cheers,
Blue.
I'm curious as to whether there's any structural load limitations regards weight per passenger seat, and does this vary from economy to business for example.
I know in the S300 (helicopter) we limit the cockpit to 600lbs but what about pax ops.
Cheers,
Blue.
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While not an expert I did some work with fleet replacement of aircraft seats a couple of years ago. The design criteria for large civil aircraft are laid down in CS-25. From memory CS25.561 & 562 are applicable. Most seats (within EASA) are approved under the ETSO system; each approved item is given a unique number.
Essentially, a seat should be designed so that when subjected to certain loads it will not deform to an extent were it might impede a rapid exit of the occupants from the aircraft cabin. The test loads are upward, forward, sideways, downward & rearward, varying between 1.5 and 9g. These are conducted used an anthropomorphic dummy weighing 77kgs. Specific parts of the dummy are subject to loads during these tests. Assuming your seat is a passenger seat fitted with a lap belt, the load to be considered is the pelvis. The maximum compressive load should not exceed 680kg, and therefore my guess is that this is the figure you have been quoted.
Essentially, a seat should be designed so that when subjected to certain loads it will not deform to an extent were it might impede a rapid exit of the occupants from the aircraft cabin. The test loads are upward, forward, sideways, downward & rearward, varying between 1.5 and 9g. These are conducted used an anthropomorphic dummy weighing 77kgs. Specific parts of the dummy are subject to loads during these tests. Assuming your seat is a passenger seat fitted with a lap belt, the load to be considered is the pelvis. The maximum compressive load should not exceed 680kg, and therefore my guess is that this is the figure you have been quoted.
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ok, thanks ghostdancer,
I ask this from the point of view of safety in relation to weight limitations on passenger aircraft, and as you say not impeding exit due to deformed seating.
From what you're saying and without digging into the design docs, it seems that most of us are exceeding the design limits by weighing more than 77kgs..
Just curious,
thanks.
I ask this from the point of view of safety in relation to weight limitations on passenger aircraft, and as you say not impeding exit due to deformed seating.
From what you're saying and without digging into the design docs, it seems that most of us are exceeding the design limits by weighing more than 77kgs..
Just curious,
thanks.
