AD NUMBER: 2005-04-15
MANUFACTURER: Dassault-Aviation SUBJECT: Airworthiness Directive 2005-04-15 SUMMARY: The FAA is adopting a new airworthiness
directive (AD) for certain Dassault Model Falcon 2000EX and 900EX
series airplanes. This AD requires prohibiting dispatch with
certain equipment inoperative; and revising the airplane flight
manual to facilitate recovery of the cockpit display units in the
event of an avionics standard communication bus (ASCB) failure and
to inform the flightcrew what equipment is inoperative during an
ASCB failure.
This AD also requires doing an integrity check of the ASCB for
any faults and corrective action if necessary, and installing an
avionics software update to the Honeywell Primus Epic system. This
AD is prompted by a report that an analysis and tests of the
Honeywell Primus Epic systems installed on the Model Falcon 2000EX
and 900EX series airplanes revealed that all information displayed
on the cockpit display units could become invalid during flight. We
are issuing this AD to prevent a loss of data from all four of the
cockpit display units, and loss of all radio communications (with
the exception of VHF emergency frequency and last frequency used),
primary navigation instruments, autopilot, auto-throttle, central
alerting system, aural alarms, and normal braking (on Model Falcon
2000EX series airplanes only). These losses could reduce the
flightcrew's situational awareness, increase flightcrew workload,
and consequently reduce the ability to maintain safe flight and
landing of the airplane.
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