Narrative:

In cruise flight at FL410 over wyoming I needed to use the lavatory and check up on our passengers. The captain assumed control of the flight while I entered the cabin. When finished; I attempted to unlock the lavatory door; however the door lock had remained in the locked or engaged position; not allowing me to open it. I was able to press the call button inside the lavatory to notify the flight deck of assistance needed. In addition; I communicated the problem to our passenger in the aircraft cabin. He then relayed to the captain what had occurred. The captain informed the company over the flight phone and spoke with maintenance control in an attempt to determine the cause of the jammed door and how to open it. After several attempts the passenger was able to disengage the door latch and open the door. He had to wedge a car key into the doorframe and free up the lock. 15-20 minutes transpired during this event; during which I was unable to perform my pilot duties. After the door was unlocked; I left the lavatory and assumed my pilot position in the flight deck. Aircraft remained under complete control of the captain. He had remained in the flight deck the entire time; utilizing supplemental oxygen (one crewmember in the cockpit) and assuming pilot flying duties while communicating with company; ATC; and passengers.

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Original NASA ASRS Text

Title: First Officer of an HS-125 unable to exit lavatory engaged services of a passenger to break through the recalcitrant lock.

Narrative: In cruise flight at FL410 over Wyoming I needed to use the lavatory and check up on our passengers. The Captain assumed control of the flight while I entered the cabin. When finished; I attempted to unlock the lavatory door; however the door lock had remained in the locked or engaged position; not allowing me to open it. I was able to press the call button inside the lavatory to notify the flight deck of assistance needed. In addition; I communicated the problem to our passenger in the aircraft cabin. He then relayed to the Captain what had occurred. The Captain informed the company over the flight phone and spoke with Maintenance Control in an attempt to determine the cause of the jammed door and how to open it. After several attempts the passenger was able to disengage the door latch and open the door. He had to wedge a car key into the doorframe and free up the lock. 15-20 minutes transpired during this event; during which I was unable to perform my pilot duties. After the door was unlocked; I left the lavatory and assumed my pilot position in the flight deck. Aircraft remained under complete control of the Captain. He had remained in the flight deck the entire time; utilizing supplemental oxygen (one crewmember in the cockpit) and assuming pilot flying duties while communicating with company; ATC; and passengers.

Data retrieved from NASA's ASRS site as of April 2012 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.