Procedure is similar to isolate
contamination in the No. 1 (left) or No.
2 (right) fuel system. No. 1 system
Remove the element from barrier fuel filter (1)
and inline fuel filter (2). Remove hydromechanical
unit (HMU) screen (3) (TM 1-2840-265-23).
Inspect elements from filters (1 and 2) and
screen (3) for contamination.
If contamination is dirt, sand or grit with no
metal particles or chips, flush airframe fuel
system (Task 10-36) and engine fuel system
(Task 10-37). Go to Follow-On Maintenance.
If metal contamination is found in barrier
element of barrier fuel filter (1), perform steps
2 thru 14.
If metal is found in element of inline fuel filter
(2) or HMU screen (3), replace the HMU (TM
Install elements in filters (1 and 2). Install HMU