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MIL-A-19736A(Wep)
3.8.9 Hydraulic system: An accumulator may be used to augment the hydraulic supply available to the
reel.
3.8.9.1 Filter:  Hose reels powered by an aircraft hydraulic system shall be provided with a filter
at the inlet the reel hydraulic system.
3.8.9.2 Low pressure  An electrical circuit shall be provided for remote indication when hydraulic
pressure at the reel is less than that required for its normal operation.
3.8.10 Control system:  The reel shall have provisions for remote electrical control of its operation,
The selected operating condition shall function automatically.
3.8.11 Trail:  When TRAIL is selected the hose and drogue shall extend at an average speed not less
than 5 feet per second (fps) and not greater than 10 fps.  The speed shall be snubbed as the trailed
position is reached.  Reels carrying more than 60 feet of hose shall have previsions for setting the
trail length to the desired amount.  The trail length is required to be set on the ground only.
3.8.12 Response:  Upon engagement by a receiver aircraft the hose reel shall accelerate the boss to
rewind at a speed of 10 fps within 1 second.  The response action shall prevent hose whip, looping,
oscillation and excessive slack at an engagement speed of 10 fps throughout the airspeed envelope.
The response action shall not interfere with complete engagement of the nozzle and reception coupling
at an engagement speed as slow as 2 fps.  The response action shall prevent excessive slack and
inadvertent disconnect throughout the air refueling operation.
3.8.13 Fueling:  An electrical circuit shall be provided to control automatically a fuel pump in the
tanker fuel system. The pump shall be off when less than 25 feet of hose is extended and when the
hose is within 5 feet of the trailed position.  The pump shall shut down in the emergency event of
loss of the hose or drogue while trailed.
3.8.14 Rewind:  When REWIND is selected the hose and drogue shall retract at an average speed not less
than 5 fps. The speed shall be snubbed as the drogue nears the stowed Position. Power shall be
sufficient completely to rewind the hose and drogue throughout the airspeed envelope.  The rewind
control system shall not depend upon actuation of switches by the coupling drogue assembly as it
reaches the stowed position to stop the reel,
3.8.15 Reel lock:  Means shall be provided to prevent the reel from unwinding the hose when the drogue
is stowed and the reel control switch is in REWIND or OFF. If a mechanical lock is used an electrical
circuit shall be provided to indicate when the look is engaged.  The indication shall be given only
when the lock is fully engaged and shall not require adjustment or rigging.  With the reel control
switch in TRAIL the reel lock shall be unlatched by hydraulic actuation.
3.6.16 Emergency trail:  In the event of loss of hydraulic pressure to the reel lock with the drogue
stowed the lock shall be unlatched by electrical actuation when EMERGENCY TRAIL is selected.  The
hose and drogue shall extend to the trail position at a controlled rate of speed that will not damage
the equipment.  In the event of loss of hydraulic power and/or electrical power supplied to the hose
reel after the reel lock has been unlatched by either TRAIL or EMERGENCY TRAIL actuation the hose
and drogue snall extend to the trail position at a controlled rate of speed that will not. damage the
equipment.
3.8.17 Hose jettison: A guillotine shall be incorporated in the hose reel seining gear fair-lead.
3.8.17.1 Actuation: The guillotine shall be actuated by a Navy approved standard cartridge. Design
and evaluation of the guillotine and cartridge shall be in accordance with Specification MIL-D-21625..
The guillotine shall be explosion proof in that actuation of the unit shall not ignite a surrounding
explosive fuel mixture.
3.8.17.2 Functional: The guillotine shall cut the hose cleanly, shall freely separate the downstream
portion and shall seal both ends of the hose.  The sealed end of the hose remaining on the hose reel
shall withstand a fuel pressure of 55 pounds per square inch gage without leakage. The guillotine
shall function as specified throughout the airspeed envelope with the hose and drogue extended to
any trail position.
3.8.18 Painting:  Hose reels shall be finished with two coats of primer in accordance with Specifi-
cation MIl-P-7962 and two coats of gray laoquer in accordance with Specification MIL-L-19537.
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