A flight attendant reported that the slides on door 1 left and 1 right on the B777 had been disarmed...

Narrative:

I was assigned to the tow team as the brakeman. This aircraft was the fifth aircraft moved; and the second B777 of the day. I entered the aircraft through door 2 left; did a walk through to make sure all personnel were off; proceeded to the cockpit and accomplished the ground handling checklist. I confirmed with the tow team that the checklist was accomplished and ready to push. We arrived at [the] hangar and were towed in to parking. After confirming that the chocks were installed from tow team and that the checklist was completed I shut the APU down. Ground power was not available; so the aircraft went dark. I proceeded to 1L door to get off the aircraft. The arm/disarm handle appeared to be in the disarmed position (it was dark and handle silhouette); I opened the door and the door assist bottle activated and slide did also. L1 door area was very dark with no power on the aircraft.

Original NASA ASRS Text

Title: A Flight Attendant reported that the slides on door 1 left and 1 right on the B777 had been disarmed upon arrival. A Maintenance Technician that rode the brakes during the tow from the gate to the hanger mistook the slide has disarmed in the dark cabin and opened the door; deploying the slide.

Narrative: I was assigned to the tow team as the brakeman. This aircraft was the fifth aircraft moved; and the second B777 of the day. I entered the aircraft through door 2 left; did a walk through to make sure all personnel were off; proceeded to the cockpit and accomplished the ground handling checklist. I confirmed with the tow team that the checklist was accomplished and ready to push. We arrived at [the] hangar and were towed in to parking. After confirming that the chocks were installed from tow team and that the checklist was completed I shut the APU down. Ground power was not available; so the aircraft went dark. I proceeded to 1L door to get off the aircraft. The Arm/Disarm handle appeared to be in the disarmed position (It was dark and handle Silhouette); I opened the door and the door assist bottle activated and slide did also. L1 door area was very dark with no power on the aircraft.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1062250
Time
Date	201301
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Escape Slide
Person 1
Function	Technician
Qualification	Maintenance Powerplant Maintenance Airframe
Person 2
Function	Off Duty
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

A flight attendant reported that the slides on door 1 left and 1 right on the B777 had been disarmed upon arrival. A maintenance technician that rode the brakes during the tow from the gate to the hanger mistook the slide has disarmed in the dark cabin and opened the door; deploying the slide.