MIL-HDBK 1028/6A
d) A feeder distribution center consists of pad-mounted
equipment located off the apron as close as practical to the service points
to minimize aircraft service voltage drop. In some cases, however, for
site reasons feeder distribution centers for apron service points may be
located in the hangar. Refer to MIL-HDBK-1004/5 for sample voltage drop
calculations. See Tables 6 and 7 of MIL-HDBK-1004/5 for maximum system
distances. See Figure 10 for additional details.
2.2
Utility System Load Determinations. The total number and type of
aircraft plus the demands of other ground support activities to be supplied
by the fixed point facilities will determine load requirements for the
utility system.
2.2.1
Aircraft Utility Demands. The utility demands required for
the support of various aircraft are itemized in Table 1. The following
aircraft unit demands shall be used as the minimum FPUS design criteria:
2.2.2
System Load Diversity. The system load diversity shall be
determined by obtaining the system load diversity factor from Figure 2.
Divide the diversity factor into the total number of aircraft under
consideration to determine the number of aircraft expected to exert a
simultaneous demand.
2.2.3
System Load Demands. The system load demands shall be
determined by multiplying the aircraft unit demand by the expected
simultaneous demand for the portion of the system under consideration.
Refer to par. 2.2.1 for aircraft minimum unit demand criteria.
2.3
Starting Air System. The starting air system shall provide only
compressed air for aircraft engine starting and for pneumatic tool
operation at parking apron service islands and maintenance hangar service
points. The system design shall comply with standards specified in NAVFAC
DM-3.05, Compressed Air and Vacuum Systems. See Figures 13 and 14 for
aircraft service console mechanical schematic information.
4
Previous Page
