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|  MIL-A-l9736A(Wep)
The yellow and red lights shall. function for both dry and wet engagements. Provisions for dinting the
lights shall be included.
3.7.5.2 Hose light: A floodlight shall be provided to illuminate the air refueling hose at the area
where it trails from the tanker. The color of the light shall be Aviation Red. The light shall be
installed or shielded in such a manner as to prevent the light from being a source of direct or
reflected glare to the tanker and receiver pilot or crew.
3.7.6 Tanks: Tanker packages that include fuel tanks shall be in accordance with applicable require-
ments of Specification MIL-T-6396 for removable tanks and Specification MIL-T-18847 for external tanks.
3.7.8 Tanker external stores: Requirements for the tanker external stores are incorporated in the
detail specifications for the Aircraft Weapons Systems that carry such stores It is intended that an
existing qualified tanker external store be used.
3.8 Hose reels: Hose and reel equipment shall be used to transfer fuel in-flight. The reel shall be
hydraulic driven, automatically controlled and electrically operated from a remote control panel. If
feasible an existing qualified hose reel or a modification thereof shall be used.
3.8.1 Operating life: The design objective is 500 hours of operation without lubrication, adjustment
or replacement of parts. The hose reel shall endure 1000 cycles of operation without lubrication}
adjustment or replacement of parts except the fuel hose.
The hose reel shall require no lubrication,
3.8.2 Lubrication:
3.8.3 Drive: A hydraulic motor shall power the hose reel drum and serving gear which shall be provided
The The mecanical power transmission system may use gearing, shafting, or chain. It is not required that
the hose reel be powered in the trail direction, The hydraulic drive system shall control the trail
function so that friction brakes will not be employed.
3.8.4 Construction: The hose reel shall withstand the loads, vibration and shook encountered in,
shipping, installation and service. Hoisting lugs or pads shall be provided. Reel construction shall
afford ease qf adjustment and repair.
3.8.5 Hose installations Particular attention shall be given to the hose installation on the reel in
order to increase the service life of the hose. The hose reel drum shall be grooved to support the
hose wrapped on it. All areas where the hose rubs when moving shall be designed to reduce friction
and wear. The hose shall not be subjected to sharp local bending at any point including the serving
gear. The hose reel drum diameter shall be not less than seven times as large as the nominal hose
size (inside diameter of the hose).
3.8.6 Loads: The hose reel shall withstand 115 percent of both the basic aircraft design limit loads
and design disconnect loads, which shall be called out in the procurement specification, without
incurring malfunction or permanent set that will adversely affect operation of the unit. In addition,
the hose reel assembly shall withstand 150 percent of these loads without structural failure. Loads
apply with the hose on the reel and full of fuel. The limit disconnect load shall be calculated as
follows :
D . Aerodynamic drag of fully-trailed hose and drogue at speed and altitude for maximum dynamic
pressure.
W = Weight of hose full of fuel plus coupling and drogue.
L = Aerodynamic lift of fully-trailed hose.
The limit disconnect load is applied along both the centerline and the extremities of a 40 degree cone
centered about the normal lay of the hose when extended during flight.
3.8.7 Fuel system: The hose reel shall withstand operating, proof and burst pressures of 120, 240 and
360 pounds per square inch gage (psig) respectively. There shall be no leakage, damage or permanent
sat when the hose reel is subjected to 240 psig fuel pressure for five minutes. There shall be no
leakage or rupture when the hose reel is subjected to 360 psig fuel pressure for one minute.
3.8.8 Electrical system: The hose reel shall utilize D.C. power having characteristics in accordance
with MIL-STD-7O4 for Category C.
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