Challenger CL600
Communication Breakdown; Training / Qualification
Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Procedure
Arriving at aircraft for preflight I observed the AC external power door was closed and partially latched. Because our procedure is to leave the door open it was apparent a lineman must have closed the panel without our permission after we left the aircraft two days prior. Closing the door moves an internal switch to the 'close' position so that when hydraulic pressure is reapplied nose doors close.This situation is potentially dangerous as our practice is to leave nose doors and the nose door panel open when the aircraft is powered down for the night. Had I not noticed the closed door; hydraulics could have been re-activated during normal power-up procedures thereby unexpected closing the nose doors.Ironically; the PIC had received a call from an FBO agent during our first overnight (we stayed there for 3 nights) advising him that the panel had been observed opened. The PIC told him this was normal and panel should not be touched.
Challenger 600 crew arriving at aircraft found the AC external power door closed and partially latched. Closing the door moves an internal switch to the 'close' position so when hydraulic pressure is reapplied the nose doors close. A dangerous situation if any ground personnel are nearby. The external power door should be left open.