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|  MIL-T-18847C(AS)
3.5.1 .9.3.1.1 Additional drain locations. In addition to the requirements
of paragraph 3.5.1.9.301, drain locations shall be provided to accommodate
future aircrafts. The drain openings for these additional locations shall be
at the low points resulting from the following tank ground attitudes:
a. 1 nose down
b. level
c. 5 tail down
3.5.1.9.3.1.2 Separation of drain locations. Openings shall not be
provided on centers less than 10 inches apart. In those cases where
compliance with paragraphs 3.5.1.9.3.1 and 3.5.1.9.3.1.1 would result in drain
openings located less than 10 inches apart, a single opening shall be provided
at the point resulting in most complete drainage of each applicable
installation.
3.5.1.10 Fuel quantity gaging. The fuel quantity gaging system shall be
specified in the contract or purchase order (see 6.2).
3.5.1.11 Access openings. A minimum of one access opening shall be
provided for access to plumbing and mounting connections. Access openings
shall be large enough to ensure insertion or removal of all detachable
internal hardware such as valves, tubing, switches, probes, etc.
3.5.1.12 Strainer. A non-corrosive fuel strainer of approximately 10 mesh
wire (0.03 to 0.06 inch diameter) cloth shall be provided at the lower end of
the fuel outlet line. The strainer shall be removable to permit cleaning when
the tank is installed on the aircraft without entering the tank.
3.5.2 Tools for assembly. The tanks shall be constructed and assembled
with manually operated tools. If special tools are required, both special
tools and commercial standard tools shall be in accordance with MIL-D-8512.
3.5.3 Service connections. Quick disconnects shall be provided for fuel
lines, pressure lines, and electrical wires between the tank and the aircraft,
as approved by the Naval Air Systems Command.
3.5.3.1 Connection locations. Unless otherwise specified, the service
connections shall be located on the tank upper surface in line with the
suspension lugs. The connections shall be positioned and sized as follows:
The fuel connection shall not exceed a 2-1/2 inch line size and its centerline
shall be 5-1/4 inches aft of the centerline of the aft 30 inch suspension
lug. The air connection shall not exceed a 1-1/2 inch line size and its
centerline shall be 8-3/4 inches aft of the centerline of the aft 30 inch
suspension lug. The electrical connector(s) shall be positioned in an area
extending between 10-1/2 inches and 17-1/4 inches aft of the centerline of the
aft 30 inch suspension lug.
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