Narrative:

Flying in a PA51D, participated in a formation flight of 2 with a B25J for a quick photo opportunity at the conclusion of a flight display. Flight took longer than expected and we landed approximately PM10L. After taxi-in to the ramp and shutdown, a ground crew member pointed out that my right wing and tail navigation lights were not working with the left wing/red navigation working normally. A check of the bulbs turned up the tail light on the rudder loose in socket, worked normal after adjustment. Right navigation bulb burned out and changed -- normal operations. I had not preflted the navigation lights prior to flying, as I expected to return prior to sunset of approximately PM03L. On return to cno airport, the lead aircraft in our flight turned on his lights at which time I also turned my navigation lights on and we were in sunlight, but the cno airport, in a valley, had the runway lights on as we arrived for the overhead approach. I had observed this aircraft flying the previous day and taxiing in approximately PM00L with all navigation lights on. The aircraft logged several flts. During the day prior to my late afternoon flight apparently shock and vibration from the several flts operated rendered the 2 lights inoperative. Any flight close to official sunset will include a full preflight of navigation and landing lights before I fly.

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Original NASA ASRS Text

Title: P51 FLOWN AND LANDED 7 MINS AFTER OFFICIAL SUNSET WITH R WING AND TAIL NAV LIGHTS INOP. PLT HAD PLANNED ON BEING BACK PRIOR TO SUNSET.

Narrative: FLYING IN A PA51D, PARTICIPATED IN A FORMATION FLT OF 2 WITH A B25J FOR A QUICK PHOTO OPPORTUNITY AT THE CONCLUSION OF A FLT DISPLAY. FLT TOOK LONGER THAN EXPECTED AND WE LANDED APPROX PM10L. AFTER TAXI-IN TO THE RAMP AND SHUTDOWN, A GND CREW MEMBER POINTED OUT THAT MY R WING AND TAIL NAV LIGHTS WERE NOT WORKING WITH THE L WING/RED NAV WORKING NORMALLY. A CHK OF THE BULBS TURNED UP THE TAIL LIGHT ON THE RUDDER LOOSE IN SOCKET, WORKED NORMAL AFTER ADJUSTMENT. R NAV BULB BURNED OUT AND CHANGED -- NORMAL OPS. I HAD NOT PREFLTED THE NAV LIGHTS PRIOR TO FLYING, AS I EXPECTED TO RETURN PRIOR TO SUNSET OF APPROX PM03L. ON RETURN TO CNO ARPT, THE LEAD ACFT IN OUR FLT TURNED ON HIS LIGHTS AT WHICH TIME I ALSO TURNED MY NAV LIGHTS ON AND WE WERE IN SUNLIGHT, BUT THE CNO ARPT, IN A VALLEY, HAD THE RWY LIGHTS ON AS WE ARRIVED FOR THE OVERHEAD APCH. I HAD OBSERVED THIS ACFT FLYING THE PREVIOUS DAY AND TAXIING IN APPROX PM00L WITH ALL NAV LIGHTS ON. THE ACFT LOGGED SEVERAL FLTS. DURING THE DAY PRIOR TO MY LATE AFTERNOON FLT APPARENTLY SHOCK AND VIBRATION FROM THE SEVERAL FLTS OPERATED RENDERED THE 2 LIGHTS INOP. ANY FLT CLOSE TO OFFICIAL SUNSET WILL INCLUDE A FULL PREFLT OF NAV AND LNDG LIGHTS BEFORE I FLY.

Data retrieved from NASA's ASRS site as of July 2007 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.