Citation Excel (C560XL)
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem; Flight Crew Diverted
Aircraft
During climb; around FL180; the nose accessory door warning light illuminated. We leveled off at FL190; completed the check list and diverted to a nearby airport where the approach and landing were uneventful. The forward latch was unseated at the bottom; however the remaining latch assembly was secured. During the final walk around; before engine start; latches were verified to be secured by both crew members.
As they leveled off the flight crew of CE-560 was greeted by and nose accessory door warning light. They landed at a nearby airport and discovered one of two latches open.