Light transport first officer reported an airport vehicle crossing the departure runway after the cr...

Narrative:

After starting engines on the ramp; I announced on the CTAF frequency (118.45) that we were taxiing out for takeoff to rwy 4L (tower closed). I noticed that all airport lights were extinguished; so I activated all lighting on 118.45 using pilot controlled lighting procedures. No vehicular/aircraft traffic was observed on the surface of the airport; and no movements of same were heard on the CTAF. Just prior to taking the selected runway for departure (4L); I announced that we were taking the runway for departure. After brake release; I announced on the CTAF that we were commencing takeoff roll on 4L. All aircraft / taxi lights were on full bright. Just after the aircraft began to accelerate; I heard on the CTAF; 'airport maintenance one is crossing all airport taxiways/ runways at baton rouge; use caution for vehicle.' apparently this was an inspection vehicle for the airport prior to the tower opening. After the aircraft accelerated through approximately 90 knots; I noticed the silhouette of a vehicle crossing our active runway (4L) right to left approximately 3;000 ft in front of the aircraft; most likely the vehicle was crossing the runway on taxiway G. There was never a conflict with the aircraft and vehicle; and we were airborne well prior to where the vehicle crossed the runway; and the vehicle was clear of the runway when we passed that position.

Original NASA ASRS Text

Title: Light Transport First Officer reported an airport vehicle crossing the departure runway after the crew had announced several times that they were taxiing to and departing from Runway 4L; on the CTAF frequency. The crew had also activated the airport lighting prior to taxi.

Narrative: After starting engines on the ramp; I announced on the CTAF frequency (118.45) that we were taxiing out for takeoff to Rwy 4L (tower closed). I noticed that all airport lights were extinguished; so I activated all lighting on 118.45 using PCL procedures. No vehicular/aircraft traffic was observed on the surface of the airport; and no movements of same were heard on the CTAF. Just prior to taking the selected runway for departure (4L); I announced that we were taking the runway for departure. After brake release; I announced on the CTAF that we were commencing takeoff roll on 4L. All aircraft / taxi lights were on full bright. Just after the aircraft began to accelerate; I heard on the CTAF; 'Airport maintenance one is crossing all airport taxiways/ runways at Baton Rouge; use caution for vehicle.' Apparently this was an inspection vehicle for the airport prior to the tower opening. After the aircraft accelerated through approximately 90 knots; I noticed the silhouette of a vehicle crossing our active runway (4L) right to left approximately 3;000 ft in front of the aircraft; most likely the vehicle was crossing the runway on taxiway G. There was never a conflict with the aircraft and vehicle; and we were airborne well prior to where the vehicle crossed the runway; and the vehicle was clear of the runway when we passed that position.

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.

Attributes
ACN	1461139
Time
Date	201706
Local Time Of Day	0001-0600
Place
Locale Reference	BTR.Airport
State Reference	LA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Light Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Conflict Ground Conflict Less Severe Deviation - Procedural Published Material / Policy Ground Incursion Runway

Light transport first officer reported an airport vehicle crossing the departure runway after the crew had announced several times that they were taxiing to and departing from runway 4L; on the CTAF frequency. The crew had also activated the airport lighting prior to taxi.