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or MFD displays. Electrical system parameters are usually monitored
on the EICAS SUMRY page while the MFD is usually used for
navigation display, TCAS, WX Radar, Checklists, etc. The SUMRY
display is the power-up default display on the EICAS and MFD.
Electrical system parameters in the form of a system schematic may
also be monitored on the ELEC system schematic on the EICAS or
MFD.
The EICAS/MFD system SUMRY page displays VOLTS, left and right.
These two digital displays are an indication of the voltage on the left
and right essential buses. Depending on what is powering the airplane
electrical system, this can be an indication of airplane main battery
volts, GPU volts, or airplane generator volts.
An indication of EMER-V (emergency bus voltage) is displayed on the
SUMRY page immediately below VOLTS, left and right. Emergency
bus voltage can be monitored on the EICAS/MFD displays. The CAS
also monitors the emergency bus volts and will generate an amber
EMER BUS VOLTS message if emergency bus voltage is less than
22 volts or more than 29.5 volts.
The left and right generator AMPS are displayed below the emergency
bus voltage. There is no display for the amperage being drawn from a
GPU.
The last electrical parameter displayed on the SUMRY page is left and
right battery TEMP in degrees Celsius. Battery temperature is
displayed only for airplanes equipped with NICAD batteries.
All of the electrical system information presented on the SUMRY page
is also displayed in a schematic format on the EICAS/MFD ELEC
system schematic page. Additionally, the ELEC system schematic
display shows whether EXT PWR is connected to the airplane.
Electrical system volts and amps may also be selected for display on
either RMU. Under some conditions, the #1 RMU will automatically
display the first of two backup engine pages which provide engine
operating indications and other system data. The electrical system volts
and amps appear on page 2 of the RMU backup engine displays, which
is selectable with the PGE button on the RMU. After 20 seconds, the
display returns to page 1. Returning the RMU to the communication
and navigation function is accomplished with the RMU PGE button.
However, if the #1 RMU is displaying engine information due to an
Pilot’s Manual
4-14 PM-132A
automatic selection, that RMU will return to page 1 of the backup
engine display 20 seconds after the last pilot selection on the RMU.
The display of volts, amps and battery temperature on the EICAS/
MFD are color coded. As limits are exceeded, the digital data changes
color (amber or red). When the data is in its normal operating range, the
data is displayed in white. If any of the data exceeds a limit, the data
changes to the appropriate color and is boxed in that same color. The
exception to the display is when the actual battery temperature is below
-23° C (-9.4° F). Below this temperature, the EICAS/MFD will display
a flashing amber numeric display. If the actual battery
temperature falls below -25° C (-13° F), the numeric digits will be replaced
by amber dashes in a cyan box. This indicates the battery temperature(
s) is/are below the valid indicating system range, it is not a
system failure.
In certain cases, to alert the operator to a parameter exceedance or
malfunction, a color coded message will be presented in the upper right
corner of the EICAS. This section of the EICAS is known as the Crew
Alerting System (CAS). Warning messages will be in red and caution
messages will be in amber. A red or amber message will be
accompanied by flashing Master Warning (red) or Caution (amber)
light, while advisory messages will only flash in white lettering for 5
seconds and then go steady.
The crew is also alerted to certain malfunctions or conditions with
illumination of a red or white annunciator on the Crew Warning Panel
(CWP). The following annunciators relating to the electrical system are
located on the CWP:
L & R BATT OVHT (red) — Illuminates if the corresponding battery
temperature exceeds 70° C (160° F).
GEN FAIL (red) — Illuminates if both generators are inoperative or off
line.
EMER BATT (white) — Illuminates when the emergency battery is on
and is discharging.
Pilot’s Manual
PM-132A 4-15
DISTRIBUTION
Basic dc power distribution is illustrated in Figure 4-1. With the main
airplane batteries installed, power from the left and right batteries,
through two 40-amp fuses, is always available to the “hot wired” items
connected to the rear hot bus, the left and right hot buses, and the left
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