Commonwealth legislation

AD/UH-1/5 Amdt 2 - Tailboom Vertical Fin Spar

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legislative instrument

Plain English Summary

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This Airworthiness Directive (AD/UH-1/5 Amdt 2) requires operators of Bell UH‑1 series helicopters (and listed derivatives) to perform inspections and replace the tailboom vertical fin spar as specified by FAA AD 99‑25‑12. It revokes the prior amendment and takes effect from 20 November 2000.

CASA says the actions address fatigue cracking from high‑power events that can cause fin‑spar failure and loss of control; compliance and replacement are mandatory, and replacement is terminating action.

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Current sections

Direct links to the current provisions in AD/UH-1/5 Amdt 2 - Tailboom Vertical Fin Spar.

AD/UH-1/5 Amdt 2 - Tailboom Vertical Fin Spar

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
View image in the official source
Bell UH-1 Series Helicopters

AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official source
For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/UH-1/5 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/UH-1/5

Amdt 2

Tailboom Vertical Fin Spar 1/2001 TX

Applicability: All UH1 Series, and UH1 derivatives with the USA FAA Type Certificate Data sheets (TCDS) listed in the Requirement document.

Requirement: Action in accordance with the technical requirements of FAA AD 99-25-12 Amdt 39-11455.

Note: Replacement of the vertical fin spar in accordance with the Requirement document constitutes terminating action for the requirements of this Directive.

Compliance: As specified in the Requirement document with a revised effective date of 20 November 2000.

This Amendment becomes effective on 20 November 2000.

Background: Following accident investigations, the FAA determined that a large number of high power events can cause fatigue cracking which will result in failure of the vertical fin spar, which in turn will result in loss of control of the helicopter.

Amendment 1 was raised following an administrative error, and superseded AD/UH1/3 which was cancelled.

Amendment 2 is issued in response to a superseding FAA AD which requires the same modification and inspections as the previous AD, and additionally, a further two inspections and replacement of the vertical fin spar. This further FAA action was prompted by reports of six accidents, two of which involved fatalities, and involved fatigue cracks in the vertical fin spar that have occurred since the issue of AD

97-20-09.

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority
Amendment 1 of this Directive became effective on 24 February 2000. The initial issue of this Directive became effective on 31 December 1999.

David Alan Villiers

Delegate of the Civil Aviation Safety Authority 17 November 2000

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 20 November 2000.

Source text

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

1 AD/UH-1/5 Amdt 2 - Tailboom Vertical Fin Spar

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bell UH-1 Series Helicopters

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/UH-1/5 Amdt 1 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/UH-1/5

Amdt 2

Tailboom Vertical Fin Spar 1/2001 TX

Applicability: All UH1 Series, and UH1 derivatives with the USA FAA Type Certificate Data sheets (TCDS) listed in the Requirement document.

Requirement: Action in accordance with the technical requirements of FAA AD 99-25-12 Amdt 39-11455.

Note: Replacement of the vertical fin spar in accordance with the Requirement document constitutes terminating action for the requirements of this Directive.

Compliance: As specified in the Requirement document with a revised effective date of 20 November 2000.

This Amendment becomes effective on 20 November 2000.

Amendment 1 was raised following an administrative error, and superseded AD/UH1/3 which was cancelled.

97-20-09.

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY