B767 technician reported discovering fuel lines on engine were loose and caused an inflight shutdown...

Narrative:

During a maintenance evaluation test flight; the right engine had an un-commanded shut down and could not be restarted. It was found the fuel outlet tube coming from the mec [main engine control] going to the fuel flow transmitter had come loose and was leaking from the mec side. The last documented time this hose was disturbed was during the right engine mec replacement. When the tube was installed a new gasket was used and noticed no other defects with the installation of the tube. The bolts attaching the end were not drilled for safety wire but no defects with the run on torque were noticed. The aircraft had been run multiple times for high power runs and idle runs for troubleshooting and no leaks had shown up in the few days the aircraft was out of service. The tube may have disturbed during the fuel pump replacement for access to the oil scavenge tubes but it is not a part of the task.

Original NASA ASRS Text

Title: B767 Technician reported discovering fuel lines on engine were loose and caused an inflight shutdown and return to departure airport.

Narrative: During a maintenance evaluation test flight; the right engine had an un-commanded shut down and could not be restarted. It was found the fuel outlet tube coming from the MEC [Main Engine Control] going to the fuel flow transmitter had come loose and was leaking from the MEC side. The last documented time this hose was disturbed was during the right engine MEC replacement. When the tube was installed a new gasket was used and noticed no other defects with the installation of the tube. The bolts attaching the end were not drilled for safety wire but no defects with the run on torque were noticed. The aircraft had been run multiple times for high power runs and idle runs for troubleshooting and no leaks had shown up in the few days the aircraft was out of service. The tube may have disturbed during the fuel pump replacement for access to the oil scavenge tubes but it is not a part of the task.

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.

Attributes
ACN	1762614
Time
Date	202009
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Powerplant Fuel Distribution
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy

B767 technician reported discovering fuel lines on engine were loose and caused an inflight shutdown and return to departure airport.