Citation X (C750)
Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Total 12000
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Incorrect / Not Installed / Unavailable Part; Procedure
Acted as the SIC (Second in Command) on a flight. I conducted the initial exterior and interior preflight. As part of the checklist; I accomplished the rotary test. The last item was a bulb test for instrument panel lights. During this test I did notice that the lights in all of the four of the Flight Control Shutoff Switches did illuminate. During the post flight it was determined that while all four buttons did illuminate; not all of the bulbs illuminated. While troubleshooting the system it was determined that the PCU monitoring card was not installed in the aircraft. We only accomplish this test on the first flight of every day; and none of my other crew members mentioned any anomalies. While this is only a bulb test in the future; I must be much more diligent to each and every light bulb. The fact that all four buttons did light up; my mind saw no anomalies. Had I noticed an anomaly I would have written it up for maintenance action.I never had any intention of taking off in an aircraft with any outstanding maintenance issue. This was an oversight on my part. There was no EICAS message or any other indication that there was a problem; and twice in the checklist we confirm that there are no lights on in these switches. In the future I will be much more diligent in the normal preflight activities.
CE750 First Officer reported that during the postflight; some bulbs were not properly illuminated per the requirements of the Bulb Test.