Bell 412 inflight loss of Collective Control
Join Date: May 2010
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technoprat, 205 runs 204 levers. virtually the same as 212 and interchangable, up generally with better lives. i doubt a 212 can run the 204 levers. 212 levers are obviously stronger, also they have a larger pin, or larger bolt through the pin as levers and pins can't be interchanged. looking at pics i can now see the diffs with the 412 levers.
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Vaquero I think it's this one . . .
For sale: Bell Bell 412 (7195000 USD), USA, New Mexico, Clovis - JamesList
it's the one SN listed on the accident report, plus as you can see this one that's for sale had a complete overhaul, rewire, and interiors, the one Bell 412 flipped over in the water during recovery from the incident.
For sale: Bell Bell 412 (7195000 USD), USA, New Mexico, Clovis - JamesList
it's the one SN listed on the accident report, plus as you can see this one that's for sale had a complete overhaul, rewire, and interiors, the one Bell 412 flipped over in the water during recovery from the incident.
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Collective Flight Control Rigging
In the case of the 412 , that lost collective control because of collective lever severance , I have seen this many times in the past , and it has been attributed mostly to improper rigging of the collective flight control , which allows the collective levers to bottom out on top of the swash plate mounting bolts when the collective is in the full down position . This clearance is critical especially during the auto-rotative rpm check during the test flight , and after rigging has been accomplished . if this clearance is not there , and the levers bottom out on the mounting bolts , coupled with the 1500 psi hydraulic boost , the collective levers will be stressed to the point of fracture , and eventual complete severance , and failure .
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Bell ASB
Found this today,
BELL CUSTOMER - One Bell. On a Mission.
ASB_412CF-11-47.pdf 27-Sep-11 COLLECTIVE LEVER 412-010-408-101, 100 HOUR SPECIAL INSPECTION, INTRODUCTION
ASB_412-11-148.pdf 27-Sep-11 COLLECTIVE LEVER 412-010-408-101, 100 HOUR SPECIAL INSPECTION, INTRODUCTION
Only 14 months after the event
BELL CUSTOMER - One Bell. On a Mission.
ASB_412CF-11-47.pdf 27-Sep-11 COLLECTIVE LEVER 412-010-408-101, 100 HOUR SPECIAL INSPECTION, INTRODUCTION
ASB_412-11-148.pdf 27-Sep-11 COLLECTIVE LEVER 412-010-408-101, 100 HOUR SPECIAL INSPECTION, INTRODUCTION
Only 14 months after the event
