CE750 first officer reported that during the postflight; some bulbs were not properly illuminated pe...

Attributes
ACN	1694779
Time
Date	201910
Local Time Of Day	0601-1200
Place
Locale Reference	BZN.Airport
State Reference	MT
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation X (C750)
Operating Under FAR Part	Part 91
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Indicating and Warning - Lighting Systems
Person 1
Function	First Officer
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Total 12000
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

Narrative:

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.

Original NASA ASRS Text

Title: CE750 First Officer reported that during the postflight; some bulbs were not properly illuminated per the requirements of the Bulb Test.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

CE750 first officer reported that during the postflight; some bulbs were not properly illuminated per the requirements of the bulb test.