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|  MIL-A-19736A(Wep)
3.3.3 Pneumatics: Pneumatic systems associated with or part of air refueling equipment shall be in
accordance with Specification MIL-P-5518.
3.3.4 Maintainability.
3.3.4.1 Access: Functional equipment shall be arranged so that access is provided for preflight
servicing adustment and routine maintenance without removing the tanker package from the aircraft.
Hose reels shall be accessible for preflight servicing, adjustment and routine maintenance without
removal from the tanker package.
3.3.4.2 Ground check: Provisions and procedures for ground operation checkout shall be adequate,
simple and brief.
3.3.4.3 Ground handling: Tanker packages shall be of size and weight compatible with shipboard
elevators and handling equipment. Equipment shall have provisions for hoisting, loading and transport-
ing as required.
3.3.4.4 Ground support: The design objective is that air refueling equipment should not require
special tools for assembly, disassembly, installation or adjustment. Support equipment for instal-
lation, ground operation checkout and maintenance shall be in accordance with Specification MIL-D-8512.
Lists and drawings for such equipment shall conform to Specification MIL-D-8513.
3.4 Electrical systems.
3.4.1 Equipment: Selection and installation of electric equipment in air refueling systems shall be
in accordance with Specification MIL-E-7080. Solenoids shall be in accordance with Specification MIL-
S-4040. Limit switches shall be hermetically sealed and shall be in accordance with Specification
MIL-S-6744. Relays shall be hermetically sealed and shall be in accordance with Specification MIL-R
63.06.
3.4.2 Connections: All external electrical connections shall be terminal connections in accordianoe
with Specification MIL-T-7928 or environmental class connectors in accordance with Specification MIL-
C-5015 and/or Specification MIL-C-26482. It shall not be possible to connect the eletrical leads to
the wrong termdnals.
3.4.3 Circuit protection: The circuit protective devices shall be accessible to the pilot or crew
3.4.4 Bonding: All fuel transfer equipment shall be bonded in accordance with specification MIL-B-5087
to prevent buildup of static electrical charge by flowing fuel. The equipment shall be bonded to the
airframe structure.
3.5 Fuel System: Air refueling systems shall be in accordance with applicable requirements of Specifi-
cation MIL-F-17874 for installation and test of aircraft fuel systems.
3.5.1 Fuels: The system shall be suitable for transferring fuels conforming to Specification MIL-J-
5624, Grades JP-4, and JP-5.
3.5.2 Pressure.
3.5.2.1 0perating pressure: Systems which require operating pressures in excess of 60 pounds per
square inch gage (psig) shall withstand operating proof and burst pressure of 120, 240 and 360 psig
respectively.
3.5.2.2 Pressure at coupling: Fuel pressure at the reception coupling throughout th range of flow
rates shall. be regulated at 5O psig. The pressure shall be not greater than 55 psig for all flow
rates including the no-flow condition. The reception coupling shall not be subjected to pump pressure
during engagement and disengagement of receiver aircraft.
3.5.2.3 Surge: The surge pressure throughout the air refueling equipment for all conditions of flow
and shutoff shall be not greater than the proof pressure of the system. Devices for relief of surge
pressure shall not require spillage or dumping of fuel outside or the fuel system.
3.5.3 Transfer rate.
3.5.3.1 Tanker system.
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