Commonwealth legislation

AD/ATR 42/21 - Thermal Acoustic Insulation Blankets on Frame 24

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This Airworthiness Directive requires operators of ATR 42-400 and 42-500 aeroplanes to remove metallised PET (Mylar) thermal-acoustic insulation blankets from both sides over frame 24 (between stringers 5 and 14), unless the aircraft already has certain ATR modifications or a specific service bulletin. CASA set a compliance deadline of 25 flight hours from the effective date (25 October 2007); the AD follows discovery of burnt spots and identifies a potential fire risk from proximity to the hot bleed air duct.

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Current sections

Direct links to the current provisions in AD/ATR 42/21 - Thermal Acoustic Insulation Blankets on Frame 24.

Avions de Transport Regional ATR 42 Seri

Avions de Transport Regional ATR 42 Series Aeroplanes

AD/ATR 42/21	Thermal Acoustic Insulation Blanketson Frame 24	12/2007 DM

Applicability:	ATR 42-400 and 42-500 models, all serial numbers, except aircraft modified with ATR modification No. 05117 or 05322 or 05791 or Service Bulletin (SB) ATR42-25-0134.
Requirement:	Unless previously accomplished, remove the metallised PET insulation blankets installed on the left and the right sides of the aircraft over frame 24 between stringers 5 and 14, as detailed in the accomplishment instructions of SB ATR 42-25-0155.Note: EASA AD 2007-0106-E, effective 20 April 2007 refers.
Compliance:	Accomplish within 25 flight hours after the effective date.
	This Airworthiness Directive becomes effective on 25 October 2007.
Background:	On two ATR 42-500 aircraft, some burnt spots were found on insulation blankets installed over frame 24. Investigations concluded that due to the proximity of the hot bleed air duct, installation of thermal-acoustical insulation blankets having a metallised PolyEthylene Terephtalate (PET) covering (Mylar), may represent a fire risk. This AD requires the removal of metallised PET blankets covering frame 24.

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David Villiers
Delegate of the Civil Aviation Safety Authority

5 October 2007

AD/ATR 42/21

Thermal Acoustic Insulation Blanketson F

Thermal Acoustic Insulation Blanketson Frame 24

Thermal Acoustic Insulation Blankets

on Frame 24

12/2007 DM

Source text

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

Avions de Transport Regional ATR 42 Seri Avions de Transport Regional ATR 42 Series Aeroplanes

Avions de Transport Regional ATR 42 Series Aeroplanes

AD/ATR 42/21	Thermal Acoustic Insulation Blanketson Frame 24	12/2007 DM

Applicability:	ATR 42-400 and 42-500 models, all serial numbers, except aircraft modified with ATR modification No. 05117 or 05322 or 05791 or Service Bulletin (SB) ATR42-25-0134.
Requirement:	Unless previously accomplished, remove the metallised PET insulation blankets installed on the left and the right sides of the aircraft over frame 24 between stringers 5 and 14, as detailed in the accomplishment instructions of SB ATR 42-25-0155.Note: EASA AD 2007-0106-E, effective 20 April 2007 refers.
Compliance:	Accomplish within 25 flight hours after the effective date.
	This Airworthiness Directive becomes effective on 25 October 2007.
Background:	On two ATR 42-500 aircraft, some burnt spots were found on insulation blankets installed over frame 24. Investigations concluded that due to the proximity of the hot bleed air duct, installation of thermal-acoustical insulation blankets having a metallised PolyEthylene Terephtalate (PET) covering (Mylar), may represent a fire risk. This AD requires the removal of metallised PET blankets covering frame 24.

David Villiers
Delegate of the Civil Aviation Safety Authority

5 October 2007

AD/ATR 42/21 AD/ATR 42/21

AD/ATR 42/21

Thermal Acoustic Insulation Blanketson F Thermal Acoustic Insulation Blanketson Frame 24

Thermal Acoustic Insulation Blankets

on Frame 24

Deep dive

Current sections

Avions de Transport Regional ATR 42 Series Aeroplanes

Avions de Transport Regional ATR 42 Series Aeroplanes

AD/ATR 42/21

AD/ATR 42/21

Thermal Acoustic Insulation Blanketson Frame 24

Thermal Acoustic Insulation Blankets

12/2007 DM

12/2007 DM

Source text

Avions de Transport Regional ATR 42 Seri Avions de Transport Regional ATR 42 Series Aeroplanes

Avions de Transport Regional ATR 42 Series Aeroplanes

AD/ATR 42/21 AD/ATR 42/21

AD/ATR 42/21

Thermal Acoustic Insulation Blanketson F Thermal Acoustic Insulation Blanketson Frame 24

Thermal Acoustic Insulation Blankets

12/2007 DM 12/2007 DM

12/2007 DM