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AD/ATR 42/21 - Thermal Acoustic Insulation Blankets on Frame 24
Avions de Transport Regional ATR 42 SeriAvions de Transport Regional ATR 42 Series Aeroplanes
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Avions de Transport Regional ATR 42 Series Aeroplanes
| AD/ATR 42/21 | Thermal Acoustic Insulation Blanketson Frame 24 | 12/2007 DM |
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| 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. |
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| 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