What was found
AIRCRAFT DEPARTED WITH NO PAXS ON BOARD. CAPTAIN REPORTED THAT AT ABOUT 25 MINUTES AFTER TAKEOFF AT FL280, A ONE INCH CRACK IN THE SHAPE OF A Y WAS OBSERVED ON THE FIRST OFFICERS WINDSCREEN. THE ACFT WAS SLOWED & THE CAPTAIN CONTACTED COMPANY MX & DETERMINED THE BEST OPTION WAS TO RETURN. CAPTAIN NOTIFIED ATC & HAD AN UNEVENTFUL LANDING, NO EMER WAS DECLARED. THE WINDSHIELD WAS R & R ON FEB 27 - 28. REASON FOR THE CRACK IS UNKNOWN, NO BIRD STRIKE. WINDSHIELD REMAINED INTACT, NO PRESS LOSS. ACFT WAS RTS ON 29 FEB 2016.