Service difficulty report · Interface Unit · Cessna 680A

Difficulty date
January 26, 2021
Submitted
February 2, 2021
Operation
Air carrier
Aircraft
N502QS
Make and model
Cessna 680A
Aircraft serial
680A0147
Aircraft time
2,251 hours, 1,505 cycles
Part
Interface Unit
Condition
Malfunctioned
Location
Cabin Pressure
Stage of operation
CR
How discovered
O
Nature of condition
J
Precautionary procedure
G

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

IN FLIGHT, RECEIVED A PRESSURIZATION CONTROL FAULT AMBER CAS MESSAGE. WHILE RUNNING THE CHECKLIST, VENTS BLEW FULL COLD, FULL HOT, AND THEN A CABIN PRESSURIZATION FAILURE WITH A CABIN RATE EXCEEDING 11,000FPM CLIMB. MANUAL CONTROL FULL DOWN MADE NO DISCERNIBLE CHANGE. AMBER, THEN RED CABIN ALTITUDE CAS MSG DISPLAYED AND O2 MASKS DEPLOYED. IN FLIGHT, LOST ENGINE OIL PRESSURE INDICATIONS WITH VALUE REPLACES BY AMBER DASHES. IN FLIGHT, LOST ENGINE OIL PRESSURE INDICATION ON R ENGINE. VALUE REPLACED BY AMBER DASHES. IN FLIGHT, LOST DC AMPERAGE INDICATION AND VALUE WAS REPLACED BY AMBER DASHES. IN FLIGHT, ENG CNTRL FAULT R AMBER CAS MAG CAME ON. RUNNING THE CHECKLIST WOULD EXTINGUISH THE MSG, BUT IT WOULD REAPPEAR 15-30 SECONDS LATER. A REVIEW OF PROPULSION PAGE ON THE GTC INDICATED FADEC A WAS IN USE AND B WAS UNAVAILABLE. IN FLIGHT, AMBER "X" DISPLAYED OVER R WING. REMOVED AND REPLACED #3 GEA 7100 ENGINE/AIRFRAME INTERFACE UNIT IAW CE-680A AMM 31-40-15. PERFORMED THE GARMIN GEA 7100 ENGINE/AIRFRAME UNIT 3 OPERATIONAL CHECK IAW CE-680A AMM 31-30-00. SYSTEM OPS CHECK GOOD, NO DISCREPANCIES NOTED AT THIS TIME.

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