UFC 4-211-01N
25 October 2004
External aircraft power provided by the power service points must
be within the voltage and frequency tolerances specified for aircraft
type. The flexible power cable to the aircraft must be adequately
sized to meet the specified aircraft loading (amperage)
requirements. Spiral wrapped, six around one, flexible cables,
designed specifically for 400-hertz systems should be used.
7-4.1
400-Hertz. Refer to MIL-HDBK-1004/5, 400-Hertz Medium-Voltage
Conversion/Distribution and Low-Voltage Utilization Systems for 400 Hz power
requirements and to criteria for OH space power and grounding requirements for
aircraft maintenance.
7-4.2
Considerations. Recent developments in aircraft power
requirements are leading to providing individual power units for each aircraft
power connection. Coordinate all requirements with using activity and aircraft
manufacturer and dedicate adequate wall space for all equipment.
7-5
EMERGENCY POWER. Provide emergency power as required or
dictated by mission. Provide emergency lighting with battery backup units.
Coordinate and provide for any emergency power requirements for hangar door
operation during power outages. See paragraphs 3-11.1 and 3-11.2 for more
information on doors.
7-6
O1/O2 LEVEL SPACES. Provide power outlets for shop tools and
at shop bench locations. Provide dedicated circuits to the extent possible for
tools and equipment.
Provide grounded convenience outlets at 60 Hz, 120 V, 20 A,
capacity throughout the O1/O2 level administrative, personnel, and shop spaces
and as required by NFPA 70. Provide ground fault interrupt (GFI) receptacles in
locations required by NFPA 70.
Serve shop spaces by distinct panels dedicated to shop and
equipment loads only. Do not tie office spaces directly to shop circuits or panels.
Consider harmonics in office spaces and use K-Rated transformers
where circuits warrant their use.
7-7
LIGHTING.
7-7.1
Interior Lighting. Interior lighting in the hangar (OH) space must
be an energy-efficient type, such as high-pressure sodium vapor or metal halide.
Metal halide should be used when specific tasks require good color rendition.
Provide connections for task lighting under shadow of aircraft.
Other interior lighting should be fluorescent. Design lighting
systems in accordance with UFC 3-520-01, Design: Interior Electrical Systems,
MIL-HDBK-1190, IESNA Lighting Handbook and with customer needs. Minimize
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