Commonwealth legislation

AD/BO 105/23 - Main Rotor Blade Secondary Bolt Locking

In ForceCTH

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Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

Requires owners/operators of all MBB (Messerschmitt‑Bölkow‑Blohm) BO 105 helicopters to secure the main rotor blade secondary bolt by following Transport Canada AD CF‑88‑18 (manufacturer ASB MBB ASB‑BO‑105‑10‑101 Rev 3 is referenced). Compliance deadline: 27 October 2007; effective 27 September 2007.

It addresses anti‑rotation of the secondary bolt (Germany’s LBA had required lockwire; MBB developed a lockwasher). The operator pays for the modification; CASA enforces compliance.

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Current sections

Direct links to the current provisions in AD/BO 105/23 - Main Rotor Blade Secondary Bolt Locking.

Eurocopter BO 105 Series Helicopters

AD/BO 105/23	Main Rotor Blade Secondary Bolt Locking	10/2007

Applicability:	All Messerschmitt-Bolkow Blohm (MBB) Model BO 105 helicopters.
Requirement:	Action in accordance with the requirements of Transport Canada AD CF-88-18.Note: MBB ASB-BO-105-10-101 Revision 3 refers.
Compliance:	Unless already accomplished, before 27 October 2007.
	This Airworthiness Directive becomes effective on 27 September 2007.
Background:	German LBA AD 87-106/2 mandated the use of lockwire as an anti-rotational lock for the secondary bolt of the main rotor blade. MBB later devised a lockwasher as a more suitable anti-rotational device.

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David Villiers
Delegate of the Civil Aviation Safety Authority

13 August 2007

AD/BO 105/23

Main Rotor Blade Secondary Bolt Locking

10/2007

Source text

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

Eurocopter BO 105 Series Helicopters Eurocopter BO 105 Series Helicopters

Eurocopter BO 105 Series Helicopters

AD/BO 105/23	Main Rotor Blade Secondary Bolt Locking	10/2007

Applicability:	All Messerschmitt-Bolkow Blohm (MBB) Model BO 105 helicopters.
Requirement:	Action in accordance with the requirements of Transport Canada AD CF-88-18.Note: MBB ASB-BO-105-10-101 Revision 3 refers.
Compliance:	Unless already accomplished, before 27 October 2007.
	This Airworthiness Directive becomes effective on 27 September 2007.
Background:	German LBA AD 87-106/2 mandated the use of lockwire as an anti-rotational lock for the secondary bolt of the main rotor blade. MBB later devised a lockwasher as a more suitable anti-rotational device.

AD/BO 105/23 - Main Rotor Blade Secondary Bolt Locking

Plain English Summary

Deep dive

Current sections

Eurocopter BO 105 Series Helicopters

Eurocopter BO 105 Series Helicopters

AD/BO 105/23

AD/BO 105/23

Main Rotor Blade Secondary Bolt Locking

Main Rotor Blade Secondary Bolt Locking

10/2007

10/2007

Source text

Eurocopter BO 105 Series Helicopters Eurocopter BO 105 Series Helicopters

Eurocopter BO 105 Series Helicopters

AD/BO 105/23 AD/BO 105/23

AD/BO 105/23

Main Rotor Blade Secondary Bolt Locking Main Rotor Blade Secondary Bolt Locking

Main Rotor Blade Secondary Bolt Locking

10/2007 10/2007

10/2007