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A simulator technician reported that an air handler unit's 480 volt input feed line had a wire that was not secured to its connector.
| Attributes | |
| ACN | 1509195 |
| Time | |
| Date | 201801 |
| Aircraft 1 | |
| Make Model Name | No Aircraft |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Repairman |
| Events | |
| Anomaly | No Specific Anomaly Occurred All Types |
Narrative:
Aircraft technicians were troubleshooting 787-1 air handler unit (ahu) because it was blowing 78-degree air. They went to 787-2 ahu to verify settings. The operating and service manual for the unit was inside under the 480 volts input feed lines on the bottom of the unit. One technician reached down to get the manual and the yellow wire of the 480 volts input power came out of its connection. The yellow wire is still loose; [because] the simulator is in training and the simulator would shut down. This was a near miss; as if the wire would have touched the technician or the metal floor he was touching; it could have seriously hurt or killed an employee. [The] electric company [that] installed these units did not correctly tightened down the input wires. We have had countless problems with [this] electric company not torquing wires on this construction project. The company has been told on several occasions to go over their work; after the first incident occurred. It was suggested that the electric company put a team of journeymen electricians together to go through all the work done by apprentices. It is obvious this did not get done. We are extremely concerned of the unknown problems that may exist for our building maintenance and simulator technicians who have to work on all this equipment.
Original NASA ASRS Text
Title: A Simulator Technician reported that an Air Handler Unit's 480 Volt input feed line had a wire that was not secured to its connector.
Narrative: Aircraft technicians were troubleshooting 787-1 Air Handler Unit (AHU) because it was blowing 78-degree air. They went to 787-2 AHU to verify settings. The operating and service manual for the unit was inside under the 480 Volts input feed lines on the bottom of the unit. One technician reached down to get the manual and the yellow wire of the 480 Volts input power came out of its connection. The yellow wire is still loose; [because] the Simulator is in training and the Simulator would shut down. This was a near miss; as if the wire would have touched the technician or the metal floor he was touching; it could have seriously hurt or killed an employee. [The] Electric Company [that] installed these units DID NOT correctly tightened down the input wires. We have had countless problems with [this] Electric Company not torquing wires on this construction project. The Company has been told on several occasions to go over their work; after the first incident occurred. It was suggested that the Electric Company put a team of journeymen electricians together to go through all the work done by apprentices. It is obvious this did not get done. We are extremely concerned of the unknown problems that may exist for our Building Maintenance and Simulator Technicians who have to work on all this equipment.
Data retrieved from NASA's ASRS site 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.