TM 1-1520-238-T-6
9–15
9–2.
LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (cont)
9–2
f. External Power and Ground Service Utility Receptacle (fig. 9–4).
The external power consists of an
external power monitor, an external power contactor, and an external power receptacle. Ground service utility
consists of a ground service receptacle capable of providing both ac and dc electrical power for external
application.
(1) External Power Monitor.
The external power monitor, located in the aft avionics bay, is a solid state
LRU with one electrical receptacle and is capable of producing 28 VDC at 5 amperes from an internal power
supply. It also prevents application of improper external power to the aircraft ac electrical power system and
controls power to the external power contactor.
(2) External Power Contactor.
The external power contactor, located inside the electrical power
distribution box, is a LRU with terminal studs on the front face. When the external power contactor is energized,
the contactor connects incoming external power to the aircraft ac electrical power system. The contactor is
energized by 28 VDC from the external power monitor.
(3) External Power Receptacle.
The external power receptacle, located behind the external power
access door R345 on the right side of the aircraft, provides a means of connecting a 3–phase, 115/200 VAC, 400
Hz ground power source to the aircraft. The external power access door activates a switch (S13) which lights the
EXT PWR indicator on the pilot caution/warning panel when the door is open.
(4) Ground Service Utility Receptacle.
The ground service utility receptacle, located behind ground
service utility door B60R under the front end of the right FAB, supplies three phase, 115/200 VAC and 28 VDC
aircraft power for external applications. Overload protection for the ac circuit is provided by the AC ELEC UTIL
PWR circuit breaker (CB6). Overload protection for the dc circuit is provided by the DC ELEC UTIL PWR circuit
breaker (CB7).
g. Navigation Lights.
Navigation lights (fig. 9–5) consist of a red navigation light which is teardrop shaped
and located on the left wingtip, a green navigation light which is teardrop shaped and located on the right wingtip,
and the white navigation light which is round and located on top of the vertical stabilizer.
TAIL NAVIGATION LIGHT (WHITE)
M69-129
LEFT WING TIP
NAVIGATION LIGHT (RED)
RIGHT WING TIP NAVIGATION LIGHT
(GREEN)
Figure 9–5.
Navigation Lights Major Components Location
