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that is not within tolerances and disconnects external
power from the buses if undervoltage, overvoltage, underfrequency,
o verfrequency,o r phase-reversaol ccurs.
Power can be reapplied to the aircrafi by pressing the
reset button adjacent to the receptacle, provided it is
within prescribed limits. External electrical power is
automatically inhibited from HUD, MFD, AICS, APX-
76, CADC, and CIU without external air-conditioning
connectedt o the aircraft. When the left generatorc omes
on the line during start, it automatically disconnects
external power. Although there is no direct cockpit indication
of external power being applied after one generator
is operating, the HYD TRANSFER PUMP will
not operate if the external power plug is still in the
aircraft receptacle.
2.15.2 Electrical Power Distribution. Electrical
power is distributed through a series of buses. Under
normal operation, the ac generator power distribution
is split between the left and right main ac buses. Failure
of either main ac generator trips a tie connector to connect
both buses to the operative generator. Ifthe bus tie
fails to trip when the generator goes bad, the respective
transformer-rectifier will not be powered and the indication
of this double failure will be a L GEN or R GEN
caution light and a TRANSRECT advisory light. The
left and right main ac buses in turn supply ac power
directly to the respective transformer-rectifiers, and the
left main ac bus also supplies power to both essential ac
buses under normal operation.
External power is distributed through the aircraft
electrical system in the same manner as main generator
power. Like the main ac generators, dc power distribution
from the two transformer-rectifiers under normal
operationsis split betweent he let?a ndr ight main dc buses.
Failure of eithert ransformer-rectifietrr ips the respective
tie contactotro connectb oth main dc busest o theo perative
transformer-rectifierT. he TRANSmECT advisory light
provides a direct indication of dc bus tie status. An
intermption-free dc bus interconnects the left and right
main dc buses to provide a continuous source of dc
power with failure of either main ac generator and/or
transformer-rectifier. The left main dc bus additionally
supplies power to both essential dc buses under normal
operations. Power to the AFCS bus is normally supplied
from the interruption-free dc bus; however, with an output
failure from both transformer-rectifiers, the AFCS
bus load is automatically transferredt o the essentialN o.
2 bus. Loss ofmain dc powerautomaticallyactivates the
emergency generator, which, in turn, trips power
ORIGINAL
NAVAIR Ol-Fl4AAD-1
transfer relays to change essential ac and dc bus loading
f?om the left main ac and dc buses to the emergency
generator, regardless of main generator output status.
2.15.2.1 Circuit Breakers. Individual circuit protection
from an overload condition is provided by circuit
breakers, which are all located in the cockpits for accessibilityin
flight, The appropriate circuit breaker will pop
out and isolate a circuit that draws too much current, thus
preventing equipment damage and a possible tire.
Popped circuit breakers should not be reset
more than once nor held depressedu nlesst he
associated equipment is absolutely required
by operational necessity. A popped circuit
breaker indicates an equipment malfunction
or an overload condition. Repeated resets or
forced depressions of popped circuit breakers
can result in equipment damage and/or
serious electrical tire.
Cockpit circuit breaker panels are shown on FO-8
and FO-9. Circuit breakers in the pilot cockpit comprise
the majority of those required for essential aircraft systems.
The circuit breakers are arranged in rows and are
oriented so that the white banded shaft ofpopped breakers
is readily visible for flightcrew surveillance. Panels,
rows, and columns ofbreakers are identified to facilitate
breaker location and designation. Placards adjacent to
the breakers identify individual circuit breakers by affected
components; amperage ratings are indicated on
top of each circuit breaker.
2.15.2.1.1 Circuit Breaker Location. The alphanumeric
system for locating circuit breakers in the aircraft
is as follows.
The panels in the RIO cockpit are labeled 1 through
9 starting left-aft and proceeding clockwise (see Figure
2-38). Thus, panels 1 to 5 are on the RIO’s left and
panels 6 to 9 are on the RIO’s right. The pilot left and
right knee panels are designated L and R, respectively.
　
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