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|  MIL-T-62032H
controls to accomplish the corresponding pumping mode. The control for the automatic flow
control valve shall automatically revert to the closed position when the selector valve is placed in
the defuel position.
3.8.9.3.2 Deadman control. A deadman control shall be provided and shall be of the
air-operated type. The deadman control shall consist of not less than a 50-foot hose with a
deadman control at the free end. The hose shall be stored on a spring loaded reel. The deadman
control shall provide control of a pressure control valve (see 3.8.5.5) and shall prevent operation
of the pressure control valve unless the deadman control is operated. The deadman control reel
shall be located in the driver's side underslung cabinet and shall be so designed as to prevent
overrunning at end of rewind. Means shall be provided to deactivate the deadman control for
overwing refueling, and to reactivate the deadman automatically for pressure refueling. The
means shall be keyed as to which nozzle is out of its holder, such that while the underwing
pressure servicing nozzle is lifted, the deadman system is operative. When the overwing nozzle
is lifted and the selector valve is in the "OVERWING" position, flow control shall be provided
through the trigger control on the overwing nozzle.
3.8.9.3.3 Throttle. A deadman operated throttle control shall be furnished and shall be
governor regulated. The control shall be of reliable design to provide repeated positive and
smooth operation on demand. The throttle speed selector control shall have two speeds and shall
be marked to indicate the dispensing rate applicable: "THROTTLE: OVERWING,
CLOSED-CIRCUIT AND DEFUEL--PRESSURE UNDERWING (50 psi)."
3.8.9.3.4 Emergency controls. Remote, emergency, quick acting controls for closing
(but inoperable for opening) the automatic flow control valve shall be provided in accordance
with paragraph 4-8.2 of NFPA No. 407. Three emergency controls shall be provided: One near
the front of the tank on the driver's side; one near the rear of the tank on the side opposite the
driving controls; and one accessible from the catwalk. The controls shall have fusible devices to
insure automatic closing of the valve in case of fire, in accordance with paragraph 4-8.4 of
NFPA No. 407. Placarding for each emergency control shall comply with paragraph 4-8.3 of
NFPA No. 407.
3.8.9.4 Pressure servicing nozzle pressure gage. The nozzle pressure gage shall
continuously monitor pressure at the venturi throat. The gage shall read a corrected pressure
which simulates the actual pressure at the nozzle. The pressure gage shall be shock mounted and
marked "UNDERWING NOZZLE PRESSURE." The gage shall be of adequate size and located
so as to be readily visible during refueling. The gage shall have a compound scale with a range
from minus 30 psig to plus 160 psig, and shall be accurate to within one percent of the full-scale
range.
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