TM 55-1520-240-T 10-3.4 SINGLE POINT PRESSURE REFUELING SYSTEM OPERATIONAL CHECK 10-3.4 INITIAL   SETUP Applicable    Configurations: All Tools: None Materials: None Personnel    Required: Medium Helicopter Repairer References: TM    55-1520-240-23 Equipment    Condition: TM    55-1520-240-23: Electrical  Power  Off Battery    Connected Hydraulic Power Off Visual Check of Single Point Pressure Refueling Sys- tem  Performed  (Task  10-3.3) TASK RESULT 1. Make sure FUEL REFUEL circuit breaker (1) is closed. 2. Set  REFUEL  STATION  switch  (2)  to  ON. 3. Make  sure  LH  REFUEL  VALVE  POSN  and  RH  RE- FUEL VALVE POSN lights (3 and 4). 4. Press  and  release  LH  REFUEL  VALVE  POSN  and  RH REFUEL VALVE POSN lights (3 and 4). 5. Set PWR switch (5) to ON. 6. Set LIGHT switch (7) to ON. 7. Turn FUEL QTY SEL switch (9) through its positions. If circuit breaker (1) is open, dose it. If it opens again, go to Task 10-3.5. Both lights (3 and 4) shall be out If either light is on, go to Task  10-3.6. Both lights (3 and 4) shall momentarily come on. If either light  does  not  come  on,  go  to  Task  10-3.7. tight (6) shall come on. LH REFUEL VALVE POSN and RH REFUEL VALVE POSN lights (3 and 4) shall come on and go out. If light (6) does not come on, go to Task 10-3.7. If either (3 or 4) does not come on, go to Task 10-3.8. If either light comes on and stays on, go to Task 10-3.9. Light (8) shall come on. If it does not, go to Task 10-3.10. Pointer on indicator (10) shall indicate fuel level in tank selected. If pointer does not move for any switch position, go to Task 8-13.18. If pointer indicates fuel amount for all but  one  position,  go  to  Task  8-13.19. TASK RESULT NOTE A small amount of fuel will continue to flow through  me  open  primary  and  secondary valves wnen the refueling valve is dosed. 8. Perform single point refueling of all tanks or individual If fuel does not stop flowing within 4 seconds with ALL tank as required. Refer to TM 55-1520-240-23. TEST switch (11) at PRI OFF, stop refueling and go to Task  10-3.12. If fuel does not stop flowing within 4 seconds with ALL TEST switch (11) at SEC OFF, stop refueling and go to Task  10-3.13. If  during  initial  single  tank  refueling  procedures.  fuel begins  flowing  before  tank  is  selected,  stop  refueling  and go  to  Task  10-3.12  or  10-3.13. If fuel does not flow in one or more tanks during single point  refueling,  go  to  Task  10-3.14. On aircraft with , if fuel leaks from vacuum relief valve (12),  remove  and  clean  valve.  Refer  to  TM  55-1520-240- 23,  Task  10-119. On aircraft with , if fuel leaks around nipple or fitting (13)  to  vacuum  relief  line,  remove  hardware  and  repair  or replace components as required Refer to TM 55-1520- 240-23,  Task  10-119 FOLLOW-ON   MAINTENANCE: TM   55-1520-240-23: Battery   disconnected. 10-128 Change   20 GO   TO   NEXT   PAGE