AD 2005-08-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna | 680 | Airworthiness Directives; Cessna Model 680 Airplanes |
| engine | Honeywell | Primus Epic systems installed on Cessna Model 680 airplanes revealed that all four of the cockpit display units could go blank simultaneously | Airworthiness Directives; Cessna Model 680 Airplanes |
Unsafe Condition
Failure of the master network interface controller (NIC) in the Honeywell Primus Epic system to synchronize with other NICs controlling the avionics system communication bus (ASCB), leading to simultaneous loss of data from all four cockpit display units and loss of critical systems including primary navigation instruments, autopilot, flight director, master caution/warning lights, aural warnings, GPS position information, and air data/altitude information.
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Required Actions
Revising the AFM to add procedures for recovery of cockpit display units and flight crew briefings on standby instruments; performing repetitive tests of the ASCB and taking corrective action for any failures; installing hardware and avionics software upgrades.
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Compliance Time
Within 12 months of the effective date (April 29, 2005)
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Affected Aircraft
Cessna Model 680 airplanes equipped with the Honeywell Primus Epic system.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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