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AD/BELL 222/29 - Drive Hub Studs
Bell Helicopter Textron Canada (BHTC) 22Bell Helicopter Textron Canada (BHTC) 222 Series Helicopters
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Bell Helicopter Textron Canada (BHTC) 222 Series Helicopters
| AD/BELL 222/29 | Drive Hub Studs | 8/2005 |
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| Applicability: | All Bell Helicopter Textron Canada (BHTC) (previously manufactured by Bell Helicopter Textron, Inc. (BHTI)) Model 222 helicopters, with drive hub assembly, part number (P/N) 222-010-417-009, installed. |
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| Requirement: | 1. (a) Remove nuts and washers from the studs which attach spline plate, P/N222-310-418-105/-107, to the drive hub assembly, P/N 222-010-417-009.(b) Visually inspect washers, P/N AN960-416, and mating surface on the spline plate, P/N 222-310-418-105/-107, for any signs of fretting, cracking, or wear.(c) If any fretting or wear is found, replace spline plate, P/N222-310-418-105/-107, and drive hub assembly, P/N 222-010-417-009.(d) If no fretting or wear is found, install new nuts, P/N MS21042L4, and washers, P/N AN960-416, and torque nuts to 100 inch pounds plus friction (tare) torque.2. (a) apply 50 inch-pounds of torque to the spline plate P/N222-310-418-105/-107 retaining nuts.(b) If the nuts do not move, the nut torque is sufficient.(c) If, while performing step (a), one or more of the spline plate P/N222-310-418-105/-107 retaining nuts move prior to reaching 50 inch-pounds, replace spline plate, P/N 222-310-418-105/-107, and drive hub assembly, P/N 222-010-417-009.Note: FAA AD 87-09-02 R2 Amendment 39-6399, refers. |
| Compliance: | 1. Unless already accomplished, within 7 days of effective date of this AD.2. After completing the requirements of paragraphs 1 (a) and 1 (b) and then repetitively at intervals not to exceed 50 hours time in service. |
| This Airworthiness Directive becomes effective on 4 August 2005. |
| Background: | To prevent possible failure of the drive hub studs which could result in loss of flight control and subsequent loss of the helicopter. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
18 June 2005