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crossfeed bus.
Because the crossfeed bus normally feeds the
emergency buses, the pilot must use the battery
switch to energize the emergency power
relay to the EMER position, which switches
all emergency buses from the disabled crossfeed
bus to the battery bus.
With the battery switch in the EMER position,
the following aural warnings are available:
• Terrain awareness and warning system
(TAWS) alert
• Autopilot disconnect
• Check altitude
• Decision height
• Vertical track
• Marker beacon
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• Standby altimeter • Cockpit floodlights
• COM 1 • Pilot pitot-static heat
• NAV 1 • Audio panel 1 and 2
• ADC 1 • Autopilot control panel
• AHRS 1 • Standby airspeed indicator
• Landing gear lights • Standby attitude indicator
• Cabin dump • PFD 1–Reversion mode
Table 2-1. EMERGENCY BUS ITEMS
With the battery switch in the EMER
position, some aural warnings are
NOT available, including:
• Stall warning
• Landing gear
• Overspeed
• Traffic information service (TIS)
SYSTEM PROTECTION
Generator Control Units
Two GCUs regulate, parallel, and protect the
generators. The GCUs are in the tail cone,
with one unit dedicated to each starter-generator.
Each GCU controls a field and generator
relay. Each generator relay connects
the generator to its feed bus. The GCU permits
the generator relay to close when the
cockpit generator switch is in GEN and the
CAUTION
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2-8 510OM-00
Figure 2-6. CB Panels
generator output is within 0.5 volts of normal
system voltage (28.5 VDC).
When the GCU senses an internal feeder fault
(short circuit) or an overvoltage, the respective
side generator and field relays open. These relays
also open when the ENGINE FIRE switchlight
is selected.
A reverse current (10% of total load) or undervoltage
opens only the generator relay, removing
the generator from the system but leaving
the field relay closed.
The GCU utilizes software and solid-state circuitry
to perform the following operations:
• Control voltage regulation
• Load sharing
• Overvoltage/overexcitation protection
• Automatic generator line contactor
control
• Reverse current protection
• Overload protection
• Overspeed protection
• Open ground protection
• Open shunt protection
• Open point of regulation (POR) protection
• Starter cutoff
• Field weakening
• Ground fault protection
Circuit Breakers and Current
Limiters
Parallel feeder cables (between each DC feed
bus in the tail cone and the corresponding
feed-extension buses in the cockpit) receive
protection from circuit breakers. Various other
circuit breakers on the feed buses in the tail
cone protect against overload.
Current limiters, also known as fuse limiters,
are provided to protect against major electrical
overload. A list of the protected buses and
components is provided below:
• Left feed bus No. 1—200 amps
• Right feed bus No. 1—200 amps
• Air-conditioner compressor—100 amps
• Windshield heat (left)—100 amps
• Windshield heat (right)—100 amps
• Flaps—50 amps
• Hydraulic powerpack—50 amps
• HF radio (optional)—50 amps
Solid-State Relays
Solid-state relays (SSRs) serve as a combination
circuit breaker and relay for numerous
components. SSRs are individually controlled
by cockpit system switches or, in some instances,
by remotely mounted printed circuit
boards (PCBs).
SSRs are installed in either a 25- or 10-amp size;
however, they are resistor-adjustable for lower
amperage trip points. The following buses and
components are SSR-protected and controlled:
• Left avionics bus
• Right avionics bus (No. 1)
• Right avionics bus (No. 2)
• Left avionics emergency bus
• Master interior bus
• Cockpit fan
• Cabin fan
• Condenser fan
• Left fuel boost pump
• Right fuel boost pump
• Left ignitor No. 1
• Right ignitor No. 1
• Left ignitor No. 2
• Right ignitor No. 2
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510OM-00 2-9
Relays and Engine Starting
For generator-assisted second engine starts,
　
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