Document ID: chunk:federal_register_of_legislation:F2007L02664:body:0:p2
Version: federal_register_of_legislation:F2007L02664
Segment Type: other
Provision Reference: 
Character Range: 3035–5347

A330-73-3048 on both engines terminates the requirements of this Amendment.
             Note 2:  EASA AD 2007-0215 refers.
Compliance:  For Requirements 1 and 2 - Within five days after the effective date of this Amendment.
             For Requirement 3 - Not later than 31 January 2008.
             This Amendment becomes effective on 27 September 2007.
Background:  Several A330 aircraft equipped with General Electric (GE) CF6-80E1 engines experienced an engine flame out during descent, 2 to 3 seconds after engine acceleration upon aircraft altitude capture, under inclement weather conditions.  In all cases, the engines restarted and then operated normally.
             Analysis has shown that at high altitude an accretion of the conventional ice or ice crystals in the engine fan or booster stages during descent at low engine power can shed in significant amount into the core inlet upon engine acceleration when the variable bleed valve doors close.  This ice ingestion will then increase the water/air ratio leading to flame smothering.
             This situation if not corrected can lead to the temporary loss of both engines thrust in flight which constitutes an unsafe condition.  In order to mitigate the risk of a dual engine flame out in flight, the original issue of this Directive mandated the operational procedure which increases the fuel/air ratio in the engine during the descent and under inclement weather conditions.

   Amendment 1 introduced further operational requirements by amendment to the AOM and FCOM.  This placed dispatch restrictions on the aeroplane in the case of the pack flow selection being inoperative under MEL conditions.  In those circumstances the aeroplane is not allowed to be dispatched into icing conditions.
   This Amendment continues the requirements of the previous issues and mandates the terminating action of the operational procedure together with the dispatch restriction by installation of new FADEC Software Version E1.O, which incorporates inclement weather logic improvement with other minor modifications.
   The original issue of this Directive became effective on 19 July 2006.
   Amendment 1 of this Directive became effective on 31 August 2006.

Charles Lenarcic
Delegate of the Civil Aviation Safety Authority

14 August 2007