Narrative:

May 2014. Dassault falcon 2000. Airport: ZZZ at a fixed base operator's (FBO) hangar. I was working with mechanic Y. During troubleshooting of the fuel distribution system; the left hand (left/H) and right hand (right/H) fuel crossfeed valve actuators were removed to inspect valve mechanism for freedom of movement and on the right/H side for proper part number (P/north) installed. During these checks it was discovered that the rh valve was clocked 180 degrees out of position. Both valves were then reinstalled; safetied and operational checks completed; all checks were good (for both valves). It was noted [at that time] that the rh valve was recently changed [by a vendor] and quality assurance representative (rep) X was notified. An investigation ensued involving the vendor who last replaced the right/H valve actuator; two days prior; (dassault ZZZ). I was then contacted several times [during] the following two days by our quality assurance group for a detailed explanation as to how the valve could be assembled 180-degrees out of position. Several days later I was called and conferenced in with our quality assurance rep X; dassault falconjet representative and two federal agency representatives to explain in detail what we observed/noted prior to removal of the crossfeed valve actuators. Followed by what we saw with the actuators off [removed] and then with the actuators reinstalled. It was discovered in that discussion that the left/H crossfeed valve actuator was removed and reinstalled without documentation. The following day I was notified by quality assurance rep X that we had performed undocumented maintenance and that I should file a report. This event will be a constant reminder to be diligent about documenting items/systems that get disturbed during other maintenance for any reason.

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Original NASA ASRS Text

Title: An Aircraft Maintenance Technician (AMT) describes how their troubleshooting efforts identified the cause of a Fuel Distribution System problem on a Dassault Falcon 2000 aircraft. A previous motor actuator replacement installation at the Right Crossfeed Valve Assembly by a Contract Maintenance Vendor was found to be 180-degrees out of position.

Narrative: May 2014. Dassault Falcon 2000. Airport: ZZZ at a Fixed Base Operator's (FBO) hangar. I was working with Mechanic Y. During troubleshooting of the Fuel Distribution System; the Left Hand (L/H) and Right Hand (R/H) Fuel Crossfeed Valve Actuators were removed to inspect valve mechanism for freedom of movement and on the R/H side for proper Part Number (P/N) installed. During these checks it was discovered that the RH valve was clocked 180 degrees out of position. Both valves were then reinstalled; safetied and operational checks completed; all checks were good (for both valves). It was noted [at that time] that the RH valve was recently changed [by a Vendor] and Quality Assurance Representative (Rep) X was notified. An investigation ensued involving the Vendor who last replaced the R/H valve actuator; two days prior; (Dassault ZZZ). I was then contacted several times [during] the following two days by our Quality Assurance group for a detailed explanation as to how the valve could be assembled 180-degrees out of position. Several days later I was called and conferenced in with our Quality Assurance Rep X; Dassault Falconjet Representative and two Federal Agency Representatives to explain in detail what we observed/noted prior to removal of the crossfeed valve actuators. Followed by what we saw with the actuators off [removed] and then with the actuators reinstalled. It was discovered in that discussion that the L/H Crossfeed Valve Actuator was removed and reinstalled without documentation. The following day I was notified by Quality Assurance Rep X that we had performed undocumented maintenance and that I should file a report. This event will be a constant reminder to be diligent about documenting items/systems that get disturbed during other maintenance for any reason.

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.