Date: 201808
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Aircraft: Regional Jet 200 ER/LR (CRJ200)
Operator: Air Carrier
Flight phase: Taxi
ATC / advisory: Ground ZZZ
Second aircraft: Commercial Fixed Wing
Aircraft component: Winglet
Component problem: Improperly Operated
Reporter organization: Air Carrier
Reporter function: Technician
Reporter qualification: Maintenance Airframe; Maintenance Powerplant
Human factors: Situational Awareness
Anomaly: Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Aircraft
Detector: Person Maintenance
When detected: Taxi
Result: Aircraft Aircraft Damaged
Contributing factors: Airport; Environment - Non Weather Related; Human Factors; Procedure
Primary problem: Human Factors

Narrative: I was asked to taxi an aircraft by my Lead Mechanic from the back corner of our ramp to [a] gate at the terminal for its morning departure. It was parked next to another aircraft in a staggered formation. As we approached the aircraft; I looked to see the clearance between the aircraft winglets and determined that I would be able to turn out away from the other plane and still have good distance between the planes on the right and also between the fences on the left. My partner removed the chocks from the nose landing gear and I connected the torque links. As I was doing this; my Lead was walking up and asked if I needed to be tugged out or if I thought that I could turn out. Another mechanic was also approaching with our Lektro to help tug it out of its current position. I told them both that I would be able to turn out and that I did not require to be tugged.Both my partner and myself opened the main passenger door and went inside the aircraft. I sat in the left seat and started the sequence to start the APU. While the APU was starting; I adjusted the left seat; then turned on the APU generator for aircraft power. Then; I turned on all 3 hydraulic systems and armed nose wheel steering while my partner closed the passenger door. After she sat down in the right seat; I started the right Number 2 engine as that provides hydraulic pressure to the brakes in the event that the generators failed. After it stabilized; I started the left Number 1 engine and flipped on the Number 2 IDG. After the Number 1 engine stabilized; I flipped on the Number 1 IDG. I ran through all the EICAS synoptic pages and turned on both COM Number 1 and Number 2 to Ground frequency. After all things were set properly; I asked my partner to watch the right wing and make sure that I was clear. She did exactly as I asked and did not look away. We did not have a wing walker watching the left wing or right wing.I turned the nose wheel fully to the left and gave the right engine thrust as to move the aircraft. She stated that it looked like I was clear from her vantage point. We moved a few feet from our original location and hit the winglet of the other aircraft with our winglet. At which point; I stopped and set the parking brake; shut down both engines and proceeded to check everything in the cockpit before I exited the plane to see what [had] happened. During which time; several individuals came out from the hangar to see what had happened. I came out and looked at the damage; at which time I went back and completely shut down the aircraft.I did not use my checklist for starting the APU or engines and I also did not have wing walkers to watch as I moved the aircraft from a tight parking spot. Always use your checklist and always have wing walkers when in close proximity to other objects and planes.




Synopsis: CRJ Maintenance Technician reported that when attempting to taxi out of a congested area; the winglet struck the winglet of another aircraft.