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NOT IN USE Indicator
The white NOT IN USE indicator comes on when these
conditions are true:
* External power is available
* The EPC is open
* Both ground service transfer relays are de-energized.
FLIGHT INTERPHONE Jack
You use the flight interphone jack to talk with only the flight
compartment. You use this jack when it is important that no
other person talks over your communication.
See the flight interphone section for more information.
(SECTION 23-51)
SERVICE INTERPHONE Jack
You use the service interphone jack to talk with other areas
inside and outside the airplane. Many people can use this at the
same time.
See the service interphone section for more information.
(SECTION 23-41)
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PILOT CALL Switch
You use the PILOT CALL switch to operate a bell in the flight
compartment. This alerts a person in the flight compartment to
talk with you.
See the communications chapter for more information.
(CHAPTER 23)
NOSE WHEEL WELL Light Control Switch
You use this switch to turn on the lights in the wheel well.
See the lighting chapter for more information. (CHAPTER 33)
External Power Receptacle
The external power receptacle has these six pins:
* Three pins for each AC power phase (pins A, B, C)
* One pin for ground (pin N)
* Two short pins for BPCU interlock logic (pins E, F).
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Purpose
The external power contactor (EPC) connects 115v ac, 400 Hz, 3
phase external power to the tie bus.
Location
The EPC is in power distribution panel 2 (PDP 2).
General Description
The contactor mechanism has a close coil and a hold coil. After
the EPC closes, switches inside the contactor change position
and remove power to the close coil. The hold coil keeps the
contactor in the closed position.
The contactor has two types of contacts: primary and auxiliary.
The primary contacts allow power from the external power
source to the bus tie breakers (BTBs). The auxiliary contacts
have these functions:
* EPC position control
* EPC position feedback to BPCU
* Bus power indication on the P5 panel.
Electrical power keeps the EPC in the closed position. The EPC
opens when this power goes away.
Training Information Point
The EPC looks like the generator breakers and bus tie breakers.
However, the EPC has a different part number and operates
differently. The EPC and the breakers have a placard which
identifies it.
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Bus Power Control Unit
The bus power control unit (BPCU) supplies these functions:
* External power contactor (EPC) control
* AC distribution bus protection
* External power monitoring and protection
* Flight compartment indication
* Bus and galley load shed
* Ground service power source control
* Refueling station power
* Built-in test equipment for fault isolation.
The BPCU coordinates the operation of the full AC power
system in normal and abnormal conditions. To do this, the
　
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