21 JANUARY 2003
adapters must be a joint economic decision between the BCE and refueling maintenance as hydrants
and MH2 hose carts must be modified at the same time.
5.14. Hydrant Hose Cart. The MH2 hose cart contains an F/S and meter. Maintenance of hose carts is
the responsibility of refueling maintenance.
5.15. High Level Shut-Off (HLSO). The 124AF has been upgraded to the 129AF (Figure 5.11) by
installing an ejector and ball float assembly. The setting is the same as for a Type I system (279
millimeters [11 inches] from the top of the tank). See Chapter 10 for maintenance frequency.
Figure 5.11. HLSO Valve (129AF).
5.16. Type II Modified (Rapid Flow). The Rapid Flow modification was done at some bases to
increase defuel rates from 757 to 1135 liters per minute (200 to 300 gallons per minute) to speed the
turnaround of KC-135s and other large aircraft. A pump on the aircraft flows fuel from the aircraft
through the LCP and into the designated defuel tank. Hydraulic power for the pump comes from
operating one engine at idling speed. The defueling pump in the LCP is only used to evacuate the hose
cart after the aircraft pump is de-energized.
5.16.1. Combination Dual Rate-of-Flow Control, Solenoid Shutoff and Check Valve (41AF-10).
This valve (Figure 5.12) operates the same as the 41AF, with the addition of a solenoid for remote-
control operations. All settings and functions are the same as the 41AF.