MIL-HDBK 1028/6A
and maintenance costs, resulting in the highest overall life-cycle cost
savings. The ECS system also has inherent operational advantages by
requiring fewer operating personnel and minimizing the need for ground
support equipment. The ECS requires no starting air recovery period.
Dedicated and separate panels for the electrical and mechanical services
shall be provided. For maintenance hangar service points, provide
electrical and mechanical services as shown in Figures 9, 10, 11, and 12 in
the later sections of this handbook. Separate dedicated panels for
mechanical and electrical services shall be provided.
2.1.3
Central Equipment Facilities. The central facilities area
shall provide the equipment building and yard area for compressed air
storage tanks and substation type transformers, and switchgear for main
electrical service. The building shall accommodate the air compressors and
auxiliary equipment, electrical service, and distribution apparatus. The
equipment for preconditioned air supply to hangar aircraft shall be located
within a hangar equipment room, a penthouse of the shop area or a separate
structure. Refer to MIL-HDBK-1004/5, 400-Hertz Medium-Voltage
Conversion/Distribution and Low-Voltage Utilization Systems for additional
details.
2.1.4
Utilities Distribution. The underground mains and feeders
shall provide for the utilities distribution to the maintenance hangar
service points and parking apron service points. The compressed air lines
and electrical conduits shall be routed in the same trench. The access
manholes shall be provided outside the paved areas. For cable-pulling
manholes, refer to MIL-HDBK-1004/2, Power Distribution Systems.
2.1.5
Site Configuration. The layout of FPUS shall be subject to
the correlated siting of maintenance hangars, parking apron space and
taxiways. For the relationship of hangars to aircraft parking areas and
taxiways, refer to NAVFAC DM-21 series, Airfield Pavement Design. The
parking apron layout is prescribed in NAVFAC P-80, Facility Planning For
Navy and Marine Corps Shore Installations. For a typical FPUS layout to
serve a predescribed hangar and parking apron complex see Figure 1. The
following criteria apply:
a) The central equipment facility shall be located as near the
hangar as practical at a location offering the most direct access to the
parking apron. Minimize the length of the underground mains to the parking
apron.
b) Locate the section of underground mains between the central
facilities and the first transition point outside the apron and taxiway
pavements.
c) The underground compressed air distribution piping should be
arranged with loops to equalize distribution line pressure throughout.
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