777 AIRCRAFT MAINTENANCE MANUAL
WES -SPEEDBRAKE ALERT
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WES -LANDING CONFIGURATION WARNING TEST
General
You start a landing configuration warning test from the maintenance access terminal (MAT). When you do a landing configuration warning test, you also do a test of the speedbrake alert function at the same time.
When the test passes, the WEUs make a landing configuration warning.
The landing configuration warning test logic checks the condition of the landing configuration warning and speedbrake alert function inputs. If any input is not present or is invalid, the test fails and you will not see a landing configuration warning.
Initiated Test Inhibit
A WEU channel must make an initiated test inhibit signal as false before a landing configuration warning test can start.
When the initiated test inhibit signal is true, the WEU channels cannot start any test.
The initiated test inhibit signal within a WEU channel is false (a test can start) only when all these conditions are true:
*
Both engines are at less than takeoff thrust
*
The airplane is on the ground
*
The nose gear is compressed
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The ADIRU and the SAARU send incomplete pitot/static data (airplane not moving)
*
Three or more WEU channels detect the same previous conditions.
Test Signal
The landing configuration warning test logic supplies a test signal that is on for 5 seconds and then it goes off. The test signal goes to the:
*
Landing configuration warning function
*
AIMS cabinets.
The landing configuration warning function makes a resetable landing configuration warning if all inputs to the landing configuration are valid.
CONFIG WARN SYST Advisory Message
The AIMS shows the CONFIG WARN SYST EICAS advisory if the test fails. Each WEU channel latches the CONFIG WARN SYST message until you do another test or until you remove and reapply power to the WEUs.
The AIMS shows the CONFIG WARN SYST EICAS advisory message only when two or more channels supply a test fail signal.
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WES -LANDING CONFIGURATION WARNING TEST
MAT Display
The MAT shows a LANDING CONFIGURATION TEST FAIL message or a LANDING CONFIGURATION TEST COMPLETE message after the test ends.
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777 AIRCRAFT MAINTENANCE MANUAL
WES -LANDING CONFIGURATION WARNING TEST
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WES -ALTITUDE ALERT FUNCTION
Purpose The altitude alert function of the WEUs tells the pilots when the airplane approaches or deviates from the mode control panel (MCP) selected altitude. * The airplane returns to within 200 feet of the selected altitude.
Altitude Approach Point
The altitude approach point is 900 feet from the selected altitude.
Altitude Approach
Altitude approach indications show on the PFD when the airplane is less than 900 feet and more than 200 feet from the selected altitude.
Altitude Capture Point
The altitude capture point is 200 feet from the selected altitude.
Altitude Alert
An altitude alert occurs when the airplane goes more than 200 feet away from the selected altitude.
Reset
An altitude alert reset occurs when one of these happens:
* The airplane goes 900 feet away from the selected altitude * The flight crew changes the selected altitude on the mode control panel
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WES -ALTITUDE ALERT FUNCTION
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WES -ALTITUDE ALERT PFD INDICATIONS AND CONTROL
General
The primary flight display (PFD) shows altitude alert indications.
Selected Altitude Display and Bug
The selected altitude from the mode control panel (MCP) shows above the altitude indication. The color of the selected altitude display is magenta.
The selected altitude bug is magenta. The bug points to the selected altitude when the selected altitude is on the PFD barometric altitude scale. If the selected altitude is not on the scale, the bug is at the top or bottom of the scale.
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