Airworthiness Directive · Amendment 39-14055 · Cessna Model 680 Airplanes
Cessna Model 680 Airplanes
This AD applies to Cessna Model 680 airplanes, certificated in any category; with serial numbers -0001 through -0021 inclusive.
The FAA is adopting a new airworthiness directive (AD) for certain Cessna Model 680 airplanes. This AD requires revising the airplane flight manual (AFM) to add procedures to facilitate recovery of the cockpit display units in the event that the cockpit display units go blank, and to add flight crew briefings on the use of standby instruments in case the cockpit display units go blank and do not recover. This AD also requires repetitive tests of the avionics standard communication bus (ASCB) for any failures, and corrective action if any failure is found. This AD also requires installing hardware and avionics software upgrades; installing the upgrades will allow removal of AFM revisions and will end the repetitive inspections of the ASCB. This AD is prompted by a report indicating that analysis of the Honeywell Primus Epic systems installed on Cessna Model 680 airplanes revealed that all four of the cockpit display units could go blank simultaneously. We are issuing this AD to prevent a simultaneous loss of data from all four cockpit display units, and loss of primary navigation instruments, autopilot, flight director, master caution/ warning lights, aural warnings, global positioning system position information, and air data and altitude information to non-avionics systems. These losses could reduce the flightcrew's situational awareness, increase flightcrew workload, and consequently reduce the ability to maintain safe flight of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 72 hours after the effective date of this AD, revise the applicable sections of the Cessna Model 680 Citation Airplane Flight Manual 68FM by inserting a copy of the procedures contained in the temporary changes listed in Table 1 of this AD.
| Cessna temporary changes | Date |
|---|---|
| 68FM TC-R03-01 | March 18, 2005. |
| 68FM TC-R03-02 | March 18, 2005. |
| 68FM TC-R03-03 | March 18, 2005. |
| 68FM TC-R03-04 | March 18, 2005. |
Within 30 days after the effective date of this AD, do a test of the avionics system communication bus for any failure indication in accordance with the Attachment of Cessna Service Bulletin SB680-34-03, Revision 1, dated March 18, 2005. If any failure indications are found during the test, do applicable corrective actions before further flight in accordance with the service bulletin. Repeat the test thereafter at intervals not to exceed 30 days until the actions required by paragraph (h) of this AD are done.
Within 90 days after the effective date of this AD, do hardware and avionics software upgrades in accordance with the Accomplishment Instructions of Cessna Service Bulletin SB680-34-03, including Attachment, Revision 1, dated March 18, 2005. Doing the requirements of this paragraph ends the requirements of paragraph (g) of this AD, and the AFM revisions required by paragraph (f) of this AD may be removed from the AFM.
(i) Although the service bulletin referenced in this AD specifies to submit certain information to the manufacturer, this AD does not include that requirement.
Hardware and avionics software upgrades done before the effective date of this AD in accordance with the Accomplishment Instructions of Cessna Service Bulletin SB680-34-03, dated February 2, 2005, is acceptable for compliance with the requirements of paragraph (h) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
