Commonwealth legislation

AD/BELL 430/9 - Yaw Synchro Resolver Shaft Control Arm Screw

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Requires owners/operators of Bell 430 helicopters (serial numbers 49001–49018, 49020–49043, 49045–49051) to install P/N 1352-04-8P screws and guard brackets in accordance with BHTC Alert Service Bulletin 430‑99‑11 (or a later Transport Canada–approved revision) to stop the yaw control arm separating from the yaw synchro resolver shaft. Effective 23 Nov 2006; compliance required by 23 Dec 2006.

Costs fall to owners/operators to procure parts and fit them; the regulator enforces compliance and permits only TC‑approved bulletin revisions.

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Current sections

Direct links to the current provisions in AD/BELL 430/9 - Yaw Synchro Resolver Shaft Control Arm Screw.

Bell Helicopter Textron Canada (BHTC) 43

Bell Helicopter Textron Canada (BHTC) 430 Series Helicopters

AD/BELL 430/9	Yaw Synchro Resolver ShaftControl Arm Screw	12/2006

Applicability:	Model 430 helicopters, serial numbers 49001 through 49018, 49020 through 49043, and 49045 through 49051.
Requirement:	Install screws part number 1352-04-8P and guard brackets in accordance with the Accomplishment Instructions of BHTC Alert Service Bulletin 430-99-11, or later Transport Canada approved revision.Note: Transport Canada AD CF-99-26 refers.
Compliance:	Unless already accomplished, before 23 December 2006.
	This Airworthiness Directive becomes effective on 23 November 2006.
Background:	A yaw control channel malfunctioned during a check for freedom of controls following maintenance. The screw that clamps the control arm to the yaw synchro resolver shaft was loose, allowing the control arm to separate from the shaft and to jam against an airframe stringer.

View image in the official source
David Villiers
Delegate of the Civil Aviation Safety Authority

12 October 2006

AD/BELL 430/9

Yaw Synchro Resolver ShaftControl Arm Sc

Yaw Synchro Resolver ShaftControl Arm Screw

Yaw Synchro Resolver Shaft

Control Arm Screw

12/2006

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

Bell Helicopter Textron Canada (BHTC) 43 Bell Helicopter Textron Canada (BHTC) 430 Series Helicopters

Bell Helicopter Textron Canada (BHTC) 430 Series Helicopters

AD/BELL 430/9	Yaw Synchro Resolver ShaftControl Arm Screw	12/2006

Applicability:	Model 430 helicopters, serial numbers 49001 through 49018, 49020 through 49043, and 49045 through 49051.
Requirement:	Install screws part number 1352-04-8P and guard brackets in accordance with the Accomplishment Instructions of BHTC Alert Service Bulletin 430-99-11, or later Transport Canada approved revision.Note: Transport Canada AD CF-99-26 refers.
Compliance:	Unless already accomplished, before 23 December 2006.
	This Airworthiness Directive becomes effective on 23 November 2006.
Background:	A yaw control channel malfunctioned during a check for freedom of controls following maintenance. The screw that clamps the control arm to the yaw synchro resolver shaft was loose, allowing the control arm to separate from the shaft and to jam against an airframe stringer.

David Villiers
Delegate of the Civil Aviation Safety Authority

12 October 2006

AD/BELL 430/9 AD/BELL 430/9

AD/BELL 430/9

Yaw Synchro Resolver ShaftControl Arm Sc Yaw Synchro Resolver ShaftControl Arm Screw

Yaw Synchro Resolver Shaft

Control Arm Screw

Deep dive

Current sections

Bell Helicopter Textron Canada (BHTC) 430 Series Helicopters

Bell Helicopter Textron Canada (BHTC) 430 Series Helicopters

AD/BELL 430/9

AD/BELL 430/9

Yaw Synchro Resolver ShaftControl Arm Screw

Yaw Synchro Resolver Shaft

12/2006

12/2006

Source text

Bell Helicopter Textron Canada (BHTC) 43 Bell Helicopter Textron Canada (BHTC) 430 Series Helicopters

Bell Helicopter Textron Canada (BHTC) 430 Series Helicopters

AD/BELL 430/9 AD/BELL 430/9

AD/BELL 430/9

Yaw Synchro Resolver ShaftControl Arm Sc Yaw Synchro Resolver ShaftControl Arm Screw

Yaw Synchro Resolver Shaft

12/2006 12/2006

12/2006