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AD/A330/88 Amdt 1 - Intermediate Pressure Turbine Overspeed Protection
Airbus Industrie A330 Series AeroplanesAirbus Industrie A330 Series Aeroplanes
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Airbus Industrie A330 Series Aeroplanes
| AD/A330/88 Amdt 1 | Intermediate Pressure TurbineOverspeed Protection | 6/2009 |
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| Applicability: | A330-243, -341, -342 and -343 models, all manufacturing serial numbers (MSN) except those on which Airbus modification 56722 has been embodied during production. |
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| Requirement: | Perform a reprogramming of Data Entry Plug on both engines to activate Intermediate Pressure Turbine Overspeed protection function in accordance with the instructions of Airbus SB A330-73-3049 Revision 01 dated 13 November 2008 or later revision approved by the European Aviation Safety Agency (EASA). |
| As the accomplishment of SB A330-73-3049 instructions has an operational consequence, the operator must contact Airbus to get the associated operational documentation. | |
| Modification of an aeroplane, prior to the effective date of this Amendment, in accordance with the instructions of SB A330-73-3049 original issue dated14 November 2007 is acceptable to comply with the requirements of this Amendment. | |
| Note: EASA AD 2009-0075 refers. | |
| Compliance: | No later than 31 July 2009. |
| This Amendment becomes effective on 4 June 2009. | |
| Background: | An operator of an A330 aircraft fitted with RR Trent 772 B engines experienced an engine #1 uncontained multiple turbine blade failure. Investigations have shown that High Pressure/Intermediate Pressure (HP/IP) oil vent tubes are prone to be affected by carbon deposit or to be damaged by their outer heat shields leading to a fire inside or outside the vent tube and resulting into IP Turbine (IPT) disc drive arm fracture and thus IPT disc over speed. |
| If not corrected, IPT disc over speed could lead to an uncontained engine failure i.e. multiple turbine blade failure or HP/IP turbine disc burst, which would constitute an unsafe condition. |
| In order to protect IPT from over speed, the original issue of this Directive required the activation of the IPTOS protection function by DEP reprogramming, which consists in limiting the IPT speed (Engine Thrust) when overheat is detected in IPT, for all A330 aircraft fitted with RR Trent 700 engines and equipped with Multi Mode Receiver. |
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