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Old 03-09-2008, 09:24 AM
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Default Seatbelt Failure?

NTSB Identification: (deleted)
Injuries: 6 Minor, 136 Uninjured.
This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed.
On (deleted), about (deleted) standard time, a (deleted), encountered severe turbulence during descent for landing at (deleted). The airplane, which was being operated under 14 Code of Federal Regulations Part 121 by (deleted), was not damaged. Five passengers and one flight attendant sustained minor injuries.

According to preliminary information, two of the five injured passengers were occupying seats where the seatbelt fittings failed and separated.

The remaining 132 passengers and 4 crewmembers were not injured. Visual meteorological conditions prevailed, and an instrument flight rules flight plan was filed for the regularly scheduled domestic passenger flight. The flight departed from (deleted), at (deleted), with an intended destination of (deleted). Following the turbulence encounter, the airplane landed in (deleted) without further incident.

According to information provided by (deleted), the flight was descending into (deleted) at an altitude of 11,400 feet above mean sea level (msl) when it encountered severe turbulence. The captain communicated with (deleted) Operations to arrange for paramedics to meet the airplane at the gate in (deleted). The flight continued and landed without further incident. Medical personnel met the airplane as requested, and the treated the injured passengers and flight attendant, classifying their injuries as minor.

A preliminary review of the flight recorder data provided by (deleted) disclosed that the airplane experienced a vertical acceleration minimum of approximately -0.761 G, followed 2 seconds later by a positive peak of approximately +1.762 G.
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Old 03-09-2008, 10:17 AM
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negative 1G with an airliner seat belt, that would be interesting. At what g do passengers get uncomfortable. What are typical airliner g limits?
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Old 03-09-2008, 01:16 PM
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Originally Posted by sean00xj
negative 1G with an airliner seat belt, that would be interesting. At what g do passengers get uncomfortable. What are typical airliner g limits?
Typically -1>g>2.5, depending on the configuration.
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Old 03-09-2008, 05:12 PM
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Originally Posted by sean00xj
negative 1G with an airliner seat belt, that would be interesting. At what g do passengers get uncomfortable. What are typical airliner g limits?
I would guess + 1.5 G would make most pax unhappy. Negative G's of any magnitude would produce mass vomiting for sure. The worst "negative" load factor we see is just slightly less than +1.0 probably + 0.7

We normally bank 15-30 degress, which barely gets you over one G, and try to never do significantly less than +1.0...really only happens on a late hand-flown level off.
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Old 03-09-2008, 07:04 PM
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This is from the Hawker that collided with the glider in 2006. Very similar.

From NTSB Accident Database

http://tinyurl.com/2oxy4o

1.9 SURVIVAL ASPECTS

During the post-accident examination of the Hawker jet, it was noted that the inboard attach points for the #5 and #7 seats were loose and the seatbelts were buckled. Interviews with the passengers revealed that one passenger was in seat #7, with his lap belt buckled, when the midair collision occurred. While the aircraft was in the traffic pattern at Carson City, the first officer informed the passengers that they were going to make a gear-up landing and everyone was to secure their seatbelts. The passenger in seat #7 tightened his lap belt and the inboard attachment end came out from between the seat cushions. He jumped up from seat #7 and sat down in seat #5 and buckled the lap belt. When he went to tighten that belt, the inboard attachment end came out from between the seat cushions. He then grabbed onto the attached portion of the seatbelt, leaned over in the prone position, and held on.

Examination of the belt's attach points revealed that the metal keepers for the hook were distorted, bent, and to some extent, expanded.

Last edited by msh168; 03-09-2008 at 07:10 PM.
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Old 03-10-2008, 05:01 PM
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Good find.
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