MIL-HDBK 1028/6A
body for bracket mounting and a red fresnel lens. Lamps shall be Type
116A21/TS, 117 W, 120 V, 60 Hz. Fail-safe photoelectric control shall be
provided for fixtures at each service island. Fixtures shall be mounted
near opposite corners of the superstructure.
g) One low-air-pressure warning light shall be mounted on
exterior panel adjacent to pressure gauge.
7.1.3.2
400 Hz Components.
The 400-Hz components shall be as follows
(refer to MIL-HDBK 1004/5):
a) For a 400 Hz central distribution system, provide a
three-pole, 600 V, 400 Hz input circuit breaker shall be provided that
shall be operable from the front of the apron service point enclosure. For
systems where the 400 Hz converter is located at the apron service point,
refer to par. 7.1.3.1.
b) 400 Hz output from the apron service point enclosure shall be
through either electrically operated contactors or 400 Hz circuit breakers.
Typically, contactors are utilized on systems with aircraft having a 48 V
dc feedback circuit and shall have three-phase overload protection.
Contactors and breakers shall be furnished with lugs for connection of the
four-wire, Size 2 AWG conductor, flexible aircraft power cable that
conforms to MS90328, Cable Assembly External Electric Power, Aircraft
115/200 Volt, 400 Hertz (Government-furnished equipment). Provide cable
grips and neoprene grommets for enclosure sidewall openings for the direct
(hard-wired) connection of the aircraft power cable to the contactor.
c) Each contactor and circuit breaker shall have two
weatherproof pilot lights, one marked "Power On" with red lens and one
marked "Power Off" with green lens mounted on exterior of the enclosure (on
the side of the associated contactor or breaker). Operate the contactor
and breaker from the front of the enclosure.
46
46
Previous Page
