*
Distance to the windshear
*
Airplane flight phase -takeoff or approach.
PWS Warning Area
During takeoff, PWS gives a warning if it detects a windshear threat in this area:
*
Less than 0.25 nm on either side of the airplane projected magnetic heading
*
More than 0.5 nm but less than 3 nm ahead of the airplane.
During approach, PWS gives a warning if it detects a windshear threat in this area:
*
Less than 0.25 nm on either side of the airplane projected magnetic heading
*
More than 0.5 nm but less than 1.5 nm ahead of the airplane.
PWS inhibits new windshear warnings during takeoff and approach if these conditions exist:
*
Airspeed more than 100 knots
*
Less than 50 feet radio altitude.
EFFECTIVITY
BEJ ALL
PWS Caution Area
PWS gives a caution if it detects a windshear threat in this area:
*
Within 25 degrees on either side of the airplane projected magnetic heading
*
More than 0.5 nm but less than 3 nm ahead of the airplane
*
Not in the PWS warning area.
PWS inhibits new windshear cautions during takeoff and approach if both these conditions exist:
*
Airspeed more than 80 knots
*
Less than 400 feet radio altitude.
All PWS alerts are inhibited above 1200 feet radio altitude.
PWS Warning -Flight Deck Effects
A PWS warning has these visual and aural annunciations:
*
A red WINDSHEAR message on the PFD
*
A red WINDSHEAR message on the ND
*
A windshear symbol on the ND
*
Master warning lights on
*
Aural annunciation -WINDSHEAR AHEAD, WINDSHEAR AHEAD (takeoff)
*
Aural annunciation -GO AROUND, WINDSHEAR AHEAD (approach).
PWS Caution -Flight Deck Effects
A PWS caution has these visual and aural annunciations:
34-43-00
Page 47 D633W101-BEJ Sep 05/2002
WXR SYSTEM -PREDICTIVE WINDSHEAR ALERTS
*
An amber WINDSHEAR message on the ND
*
A windshear symbol on the ND
*
Aural annunciation -MONITOR RADAR DISPLAY.
EFFECTIVITY BEJ ALL 34-43-00
Page 48
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
WXR SYSTEM -PREDICTIVE WINDSHEAR ALERTS
EFFECTIVITY BEJ ALL 34-43-00
Page 49
D633W101-BEJ Jan 05/2002
WXR SYSTEM -FAIL MESSAGES AND DISPLAYS
WXR System Alert Messages and Display * CON -WXR CP failure.
When a WXR RT processes data that is not satisfactory, alert messages show on the ND and the WXR display continues to show. These are the alert messages:
*
WXR CAL -receiver gain calibration failure
*
WXR STAB -both attitude inputs fail
*
WXR STB OFF -airplane attitude exceeds the stabilization
limits.
The alert messages show on these alert lines:
*
Line 1 shows WXR in amber
*
Line 2 shows CAL or STAB in amber, CAL has the highest
priority
*
Line 3 shows STB OFF in cyan.
WXR System Fail Messages and Display
When a failure occurs, a WXR fail message shows and the WXR display does not show.
The fail messages show on these alert-lines:
*
Line 1 shows WXR in amber
*
Line 2 shows FAIL in amber.
These WXR system fail messages show on alert line 3:
*
R/T -receiver-transmitter failure
*
ANT -antenna failure
EFFECTIVITY BEJ ALL 34-43-00
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777 AIRCRAFT MAINTENANCE MANUAL
WXR SYSTEM -FAIL MESSAGES AND DISPLAYS
EFFECTIVITY BEJ ALL 34-43-00
Page 51
D633W101-BEJ Jan 05/2002
WXR SYSTEM -ND RANGE DISAGREEMENT
General
The graphics generators (GGs) in the left and right AIMS cabinets do a comparison of the ranges from these places:
*
EFIS CP
*
WXR RT
*
Flight management computer function (FMCF).
A difference between any of these ranges causes an amber range disagreement message.
These two range disagreement messages are possible:
*
WXR RANGE DISAGREE shows when there is a difference between the EFIS CP range and the WXR RT range
*
MAP/WXR RANGE DISAGREE shows when there is a difference between the EFIS CP range, the WXR RT range, and the FMCF range.
This happens during a range disagreement:
*
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