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|  MIL-A-19736A(Wep)
of receiver aircraft and to make each receiver suitable for refueling from all drogue tankers including
those of the U. S. Air Force.
3.2.3 Formation: The formation shall place the nose of the receiver aircraft aft of the tail of the
tanker when engaged in refueling position at least 15 feet forward of full trail. It is a design
objective to provide not less than fifteen feet of vertical separation between tanker and receiver
aircraft.
3.2.4 Reliability: Reliability of the air refueling operation shall be the paramount consideration in
design of air refueling systems and equipment. Simplicity is required. Features which are not required
for reliable and safe accomplishment of the air refueling operation shall not be incorporated, It is
not intended to achieve reliability by duplication of equipment or functions except as specifically
required herein. Designs which have proven satisfactory in service shall be utilized for functional
components and mechanisms.
3.2.5 Effect on aircraft performance: Receiver air refueling equipment and tanker permanent provisions
shall. be designed to minimize the penalty to aerial performance and capability of the basic aircraft.
3.2.6 Communications: The air refueling system shall be suitable for accomplishing the air refueling
operation during radio silence.
3.2.7 Refueling airspeed: Air refueling systems and equipment shall operate satisfactorily cali-
brated airspeeds from 200 knots up to and including 300 knots at Mach number not greater than 0.90.
3.2.8 Engagement: Air refueling systems and equipment shall operate satisfactorily when the receiver
aircraft engages the tanker aircraft at relative speeds not greater than 10 feet per second.
3.2.9 Design conferences: Representatives of the contractor shall confer with the air refueling engi-
neers of the Bureau of Naval Weapons during the development of air refueling systems. The purpose is
to exchange information and to review proposed designs in advance of formal submittal of data. The
contractor shall initiate the first conference as soon as the preliminary schematic diagram of the air
refueling system has been prepared. Later conferences shall be arranged as significant developments
occur throughout the program.
3.3 General equipment requirements.
3.3.1 Environment: Air refueling equipment shall function satisfactorily in ground and flight environ-
mental conditions. Detail requirements will be included in equipment specifications prepared by the
procuring activity or contractor based upon procedures of Specification MIL-E-5272 and the following
conditions:
3.3.1.1 Temperature: Ambient temperatures of minus 65 degrees Fahrenheit to plus 160 degrees Fahrenheit.
It is not intended that temperature shock tests be required.
3.3.1.2 Altitude: Operating altitudes from sea level up to 40,000 feet.
3.3.1.3 Corrosion resistance: In addition to salt spray resistance, equipment shall withstand acceler-
ated corrosion conditions in accordance with Specification MIL-F-8615.
3.3.1.4 Vibration: Vibrational conditions encountered in flight. Equipment and tanks shall withstand
tests in accordance with Specification MIL-E-5272 and Specification MIL-T-6396 as applicable.
If appropriate, the explosion-producing characteristics of equipment shall be
3.3.1.5 Explosion:
determines.
3.3.1.6 Temperature - altitude - humidity: If appropriate, equipment shall be required to demonstrate
satisfactory operation under combined temperature - altitude - humidity conditions.
3.3.1.7 Shock: Inappropriate, the ability of equipment to withstand mechanical-shock shall be
determined.
3.3.1.8 Fuel: Equipment subjected to fuel shall conform to the fuel resistance-requirements of Speci-
fication~LF-8615.
3.3.2 Hydraulics: Hydraulic systems associated with or part of air refueling equipment shall be in
accordance with Specification MIL-H-5440. Hydraulic components shall conform to Specification MIL-H-8775.
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