B767 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Type 609
Situational Awareness
Flight Deck / Cabin / Aircraft Event Illness / Injury
General Physical Injury / Incapacitation
Procedure; Human Factors
I was originally scheduled to be the International Relief Officer (IRO) on [an international flight]. We ended up on maintenance and had to do a check on one of the EEC's and thus had to do a runup. Passenger deplaned; flight attendants stayed on. [This airport] requires being towed to a remote stand for a runup. The mechanic opened the hatch at door 1L that went to the E&E compartment for a check during/after the engine runup before we were to towed; the door stayed open the entire time. It was the first time I saw it and I commented to one of the Flight Attendants (FA) and Captain how interesting it was. We ended up being towed by supertug over to the runup [area]; I went back to talk to the FA about their drop dead time since now it was a lengthy delay. A couple of minutes later and while fully stopped and before the runup; I went back to the galley to grab a quick snack and took a quick bite by door 1R. Out of the corner of my eye I saw [an FA] falling into the E&E compartment. The mechanic who was talking in the cockpit turned around [and] helped; I went by him while he was helping her get out. I immediately told the Captain what happened. We were coordinating immediately with Ground in the cockpit to get help and help arrived in about 10 - 15 min. She appeared conscious but obviously in pain. I'm not certain what the circumstances were of her falling in and why she went up the aisle.
B767 First Officer reported a flight attendant was injured after falling into the open E&E compartment during ground maintenance.