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15.10.10 D6-30151-425
Warning Systems -
Controls and Indicators
1 Ground Proximity (GND PROX) Glideslope (G/S) Inhibit Switch
Push – inhibits GPWS GLIDESLOPE alert when pushed below 1,000 feet radio
altitude.
2 Ground Proximity (GND PROX) Light
Illuminated (amber) –
• GPWS alert is occuring
• Inhibited for GLIDESLOPE, or TOO LOW FLAPS, or TOO LOW
GEAR alerts when respective inhibit or override switch is pushed
3 Ground Proximity (GND PROX) Flap Override (OVRD) Switch
Push (OVRD illuminated) – inhibits TOO LOW FLAPS alert.
4 Ground Proximity (GND PROX) Configuration (CONFIG)Gear (GR)
Override (OVRD) Switch
Push (OVRD illuminated) –
• inhibits TOO LOW GEAR alert
• inhibits CONFIG GEAR alert
Decision Height Display
1 Decision Height
Displays radio altitude set by DH/MDA Altitude control.
Display changes to large flashing amber DH when descending below the altitude
set.
DH not displayed when set below zero feet.
DH200 1
April 01, 2001
747 Operations Manual
Warning Systems -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 15.10.11
Flashing amber display resets:
• upon landing
• on go-around at 75 feet above the altitude set
• when DH RST switch pushed
Status Display
1 Status Messages
Status messages indicate equipment faults requiring MEL reference for dispatch.
2 Page (PG) Number
Displayed –
• additional pages of status messages exist
• displays number of page selected
CABIN ALT AUTO A
(11 LINES)
CARGO HEAT FWD L
PG 1
1
2
SECONDARY EICAS
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
15.10.12 D6-30151-425
Warning Systems -
Controls and Indicators
EICAS Event Record Switch
1 EICAS Event Record (EVENT RCD) Switch
Push – records up to five EICAS events.
CENTER PANEL
EVENT RCD
1
April 01, 2001
747 Operations Manual
Warning Systems Chapter 15
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 15.20.1
Introduction
Warning systems consist of:
• engine indication and crew alerting system (EICAS)
• airspeed alerts
• takeoff and landing configuration warning system
• MCP selected altitude alerts
• crew alertness monitor
• traffic collision avoidance system (TCAS)
• windshear alerts
• ground proximity warning system (GPWS)
• maintenance event recording
Engine Indication and Crew Alerting System (EICAS)
EICAS consolidates engine and airplane system indications and is the primary
means of displaying system indications and alerts to the flight crew. The most
important indications are displayed on primary EICAS.
EFIS/EICAS Interface Unit (EIU)
The EIUs monitor all airplane systems continuously and control the information
displayed on the EICAS displays. Data from airplane systems is provided to three
EIUs and one of the three EIUs controls all EICAS displays. The EIU selector
provides either automatic or manual selection of the controlling EIU.
EICAS Messages
Systems conditions and configuration information is provided to the crew by three
types of EICAS messages:
• EICAS alert messages are the primary method to alert the crew to
non-normal conditions
• EICAS memo messages are crew reminders of certain flight crew selected
normal conditions
• EICAS status messages indicate equipment faults requiring MEL
reference for dispatch.
An EICAS alert or memo message is no longer displayed when the respective
condition no longer exists.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
15.20.2 D6-30151-425
Warning Systems -
System Description
EICAS Alert messages
From after engine start until engine shut down, EICAS alert messages are the
primary means to alert the crew to non-normal conditions which may impact other
operations during the flight.
There is a non-normal procedure for each EICAS alertmessage. The procedure for
every EICAS alert message is included as a checklist in the QRH. Procedures for
some EICAS alert messages have steps to reconfigure airplane systems. A caret
symbol (>) prefaces an alert message that has no procedural steps.
EICAS alert messages are grouped into three priority levels: warning, caution, and
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