Date: 202006
Local time of day: 1801-2400
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: Beechjet 400
Operator: Personal
Operating under: Part 91
Mission: Passenger
Flight phase: Parked
Aircraft component: Traffic Collision Avoidance System (TCAS)
Component problem: Malfunctioning
Reporter organization: Personal
Reporter function: Technician
Reporter qualification: Maintenance Nondestructive Testing (NDT); Maintenance Avionics; Maintenance Airframe; Maintenance Powerplant
Human factors: Distraction; Fatigue
Anomaly: Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew FLC Overrode Automation; General Flight Cancelled / Delayed; General Maintenance Action
Contributing factors: Human Factors; Procedure; Aircraft
Primary problem: Procedure

Narrative: While performing maintenance employed for Company; I was assigned to Aircraft X and was troubleshooting an ADS-B Fail on the aircraft. Part of the procedure is to put the aircraft in a 'wheels up' configuration. I disconnected both Proximity Switch Arms and placed the Arms on the reassembled bolt; washer; and spacer assembly to facilitate this action. I failed to place a marker streamer on the disconnected parts at the time they were disconnected. I was distracted because I was on the phone with tech support at the time I disconnected them and I intended to get back to the aircraft to install the streamers at a later time. I then continued to troubleshoot with the aircraft in the 'Air Mode'. Later in the morning; two additional technicians arrived at the aircraft to assist in the ADS-B troubleshooting. Around noon; I received a call for another AOG aircraft and gave a verbal turnover to the relieving technicians so I could work the other aircraft. During the verbal turnover; discussions were made briefly about the squat switches being disconnected but the majority of the turnover revolved around the complexity of the ADS-B failure to be worked and that we need to replace the GPS antenna. After working additional aircraft in ZZZ that day; I came back to the aircraft and powered the aircraft up and ADS-B Fail was gone. I worked on a couple of other discrepancies and then I signed the paperwork to release the aircraft. This failure in communication; specifically the emphasis on the squat switches being disconnected; distraction of other aircraft to be worked; and resulting failure of operational norms by not attaching a streamer resulted in the squat switches being left disconnected. I also have to state that it was a long week and I worked 18 hours the day before so fatigue may have also been a contributing factor. To prevent this from happening again in the future; I need to ensure that streamers are always installed on all removed; disconnected; or displaced parts or components immediately. I could also document that streamers are installed.




Synopsis: Technician reported not installing streamers on landing gear after disconnecting squat switches and not reconnecting the squat switches after ADS-B maintenance.