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If the message is displayed because a Thrust lever is closed at low radio altitudes,
pushing either MasterWARNING/CAUTION Reset switch silences the siren and
extinguishes the Master WARNING lights. The message remains displayed until
the Thrust levers are advanced or landing gear is down and locked.
If the message is displayed because the Flap lever is in a landing position, the siren
and alert message cannot be silenced by pushing a MasterWarning/Caution Reset
switches. The siren sounds and the EICAS message is displayed until the landing
gear is down and locked or the Ground Proximity Gear Override switch is pushed.
April 01, 2001
747 Operations Manual
Warning Systems -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 15.20.7
Configuration Warning System Non-normal Operation
If the takeoff warning system fails or if the takeoff warning system input to the
EIU fails, the EICAS alert message CONFIG WARN SY will be displayed. If the
takeoff and landing configuration system fails, CONFIG messages may or may
not be displayed. If the messages are displayed with the CONFIG WARN SY
message, the CONFIG messages may not be correct.
MCP Selected Altitude Alerts
Altitude alerting occurs when approaching or deviating from altitude selected on
the MCP.
Approaching MCP Selected Altitude
Between 900 feet and 300 feet prior to reaching the selected altitude, a highlighted
white box is displayed around the selected altitude and the current altitude on the
PFD.
Deviating From MCP Selected Altitude
When departing the selected altitude by 300 feet, the EICAS alert message
ALTITUDE ALERT is displayed, and a highlighted amber box is displayed
around the selected altitude and the current altitude. The message and amber
highlights are no longer displayed when:
• subsequently reapproaching to within 300 feet of the selected altitude, or
• a new MCP altitude is selected, or
• departing more than 900 feet from the selected altitude.
MCP Selected Altitude Alert Inhibits
MCP selected altitude alerts are inhibited when:
• glideslope captured, or
• landing flaps selected and landing gear down and locked.
Crew Alertness Monitor
The FMC continuously monitors activation of switches on theMCP, EFIS control
panel, EICAS control panel, CDUs, and VHF/HF press-to-talk switches. When a
predefined time elapses after the last control movement, the EICAS advisory
message PILOT RESPONSE is displayed.
If there is still no response after a brief time, the EICAS caution message PILOT
RESPONSE is displayed.
If there is still no response, the EICAS warning message PILOT RESPONSE is
displayed.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
15.20.8 D6-30151-425
Warning Systems -
System Description
The PILOT RESPONSE message is no longer displayed after pushing any control
on any of the monitored systems or panels.
The PILOT RESPONSE message is inhibited below 20,000 feet.
Traffic Alert and Collision Avoidance System (TCAS)
TCAS alerts the crew to possible conflicting traffic. TCAS interrogates operating
transponders in other aircraft, tracks the other aircraft by analyzing the
transponder replies, and predicts the flight paths and positions. TCAS provides
advisory, flight path guidance, and traffic displays of the other aircraft to the flight
crew. Neither advisory, guidance, nor traffic display is provided for other aircraft
that do not have operating transponders. TCAS operation is independent of
ground–based air traffic control.
To provide advisories, TCAS identifies a three–dimensional airspace around the
airplane where a high likelihood of traffic conflict exists. The dimensions of this
airspace are contingent upon the closure rate with conflicting traffic.
TCAS provides advisories and traffic displays:
TCAS messages and TCAS traffic symbols can be displayed on the ND in the
map, map centered, VOR, and approach modes. TCAS messages and TCAS
traffic symbols cannot be displayed on the ND in the VOR–centered,
approach–centered, or plan modes.
Resolution Advisories (RA) and Display
A RA is a prediction another aircraft will enter TCAS conflict airspace within
approximately 20 to 30 seconds. If altitude data from the other aircraft is not
available, no RA can be provided.
When TCAS predicts an RA:
• a TCAS voice annunciation sounds
• TCAS PFD vertical guidance is displayed
• the TCAS red message TRAFFIC is displayed on the ND.
When the TCAS cyan message TFC is displayed on the ND, and the RA is within
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