Commonwealth legislation

AD/A109/56 - Exhaust Duct Clamps

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

The directive requires owners/operators of Agusta A109A, A109AII and A109C helicopters to inspect exhaust duct grooved clamps (P/N 4606AC) per Agusta Bollettino Tecnico 109‑123 within 50 flight hours (or by 12 May 2007), and then every 300 flight hours or yearly, replacing any clamp with cracks or corrosion. It takes effect 12 April 2007.

This imposes inspection and replacement costs and downtime on operators and maintenance organisations. The stated purpose is to prevent recurrence of an incident where a clamp failure caused loss of the exhaust duct and subsequent tail‑rotor malfunction.

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Current sections

Direct links to the current provisions in AD/A109/56 - Exhaust Duct Clamps.

Agusta A109 Series Helicopters

AD/A109/56	Exhaust Duct Clamps	4/2007

Applicability:	Agusta A109A, A109AII and A109C helicopters.
Requirement:	1. Inspect the exhaust duct grooved clamps Part Number (P/N) 4606AC in accordance with Agusta “Bollettino Tecnico” 109-123 original issue or later approved revision.2. If cracks and/or corrosion are found replace the affected clamp.Note: EASA AD 2007-0041 dated 21 February 2007 refers.
Compliance:	1. Within 50 flight hours after the effective date of this AD and not later than12 May 2007, thereafter at intervals not to exceed 300 flight hours or yearly whichever occurs first.2. Before further flight after the effective date of this AD.
	This Airworthiness Directive becomes effective on 12 April 2007.
Background:	A failure of the grooved clamp led to the loss of the exhaust duct. The duct subsequently stuck and caused failure of the tail rotor. This led to an emergency landing of the helicopter. This AD requires a repeated visual inspection of the exhaust duct clamps for cracking and corrosion to prevent such a failure re-occurring.

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David Punshon
Delegate of the Civil Aviation Safety Authority

28 February 2007

AD/A109/56

Exhaust Duct Clamps

4/2007

Source text

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

Agusta A109 Series Helicopters Agusta A109 Series Helicopters

Agusta A109 Series Helicopters

AD/A109/56	Exhaust Duct Clamps	4/2007

Applicability:	Agusta A109A, A109AII and A109C helicopters.
Requirement:	1. Inspect the exhaust duct grooved clamps Part Number (P/N) 4606AC in accordance with Agusta “Bollettino Tecnico” 109-123 original issue or later approved revision.2. If cracks and/or corrosion are found replace the affected clamp.Note: EASA AD 2007-0041 dated 21 February 2007 refers.
Compliance:	1. Within 50 flight hours after the effective date of this AD and not later than12 May 2007, thereafter at intervals not to exceed 300 flight hours or yearly whichever occurs first.2. Before further flight after the effective date of this AD.
	This Airworthiness Directive becomes effective on 12 April 2007.
Background:	A failure of the grooved clamp led to the loss of the exhaust duct. The duct subsequently stuck and caused failure of the tail rotor. This led to an emergency landing of the helicopter. This AD requires a repeated visual inspection of the exhaust duct clamps for cracking and corrosion to prevent such a failure re-occurring.

AD/A109/56 - Exhaust Duct Clamps

Plain English Summary

Deep dive

Current sections

Agusta A109 Series Helicopters

Agusta A109 Series Helicopters

AD/A109/56

AD/A109/56

Exhaust Duct Clamps

Exhaust Duct Clamps

4/2007

4/2007

Source text

Agusta A109 Series Helicopters Agusta A109 Series Helicopters

Agusta A109 Series Helicopters

AD/A109/56 AD/A109/56

AD/A109/56

Exhaust Duct Clamps Exhaust Duct Clamps

Exhaust Duct Clamps

4/2007 4/2007

4/2007