On May 26, 2011 all flights involving Dassault Falcon 7X jets were prohibited following the EASA’s issuance of emergency AD 2011-0102-E. This suspension is now lifted for certain aircraft as of June 16, 2011.
The suspension of flight operations was considered to be an interim measure pending the outcome of an investigation into a serious incident involving an uncontrolled pitch trim runaway during descent.
The initial results of the investigations are showing that there was a production defect in the Horizontal Stabilizer Electronic Control Unit (HSECU) which could have contributed to the cause of the event. One specific HSECU is potentially affected by this production defect. Investigations are continuing to confirm this cause.
In the meantime, to allow re-starting flight operations and providing protection against further pitch trim runaway events, Dassault Aviation have developed two modifications which are implemented through accomplishment of Dassault Service Bulletin (SB) F7X-211. In addition, it has determined that the flight envelope must be restricted, compared to the original certified flight envelope.
For aeroplanes equipped with HSECU P/N 051244-02, this AD, which supersedes EASA AD 2011-0102-E, requires:
- accomplishment of two Dassault Aviation modifications,
- amending the AFM and installing a placard in the cockpit,
- amending the Minimum Equipment List (MEL), and
- implementing an operational test of the HSTA electric motors reversion relays.
For aeroplanes equipped with HSECU P/N 051244-04, the prohibition of flights is maintained.
Download PDF: EASA EAD 2011-0114-E