Here we are at month end again and we have the A320neo flight test updates. MSN6101 has not flown now for four months. The other GTF powered test aircraft is MSN6286 and this has been building hours again. MSN6419 is LEAP powered and has kept flying since it started test flights.
Airbus advises that for MSN6101, as this aircraft is fitted with heavy flight-test instrumentation, it takes longer to prepare and install the engine and validate the FTI. MSN6286m the other P&W-powered aircraft, could fly sooner because it has light FTI.
There was some information published suggesting LEAP engine changes. There was some precautionary maintenance plus some FTI upgrades performed to prepare for the next phase of the campaign.
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According to ‘Aviation International News’ (August 10, link below), Airbus has re-distributed Neo flight test work among the three aircraft to reduce overall impact of the absence of msn 1; delivery is still set for this year.
http://www.ainonline.com/aviation-news/air-transport/2015-08-10/airbus-sorts-out-a320neo-certification-effort