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* Expanded MAP
* Centered MAP.
PWS cautions or warnings are inhibited above 1200 feet radio
altitude.
New PWS cautions are inhibited between 80 knots computed
airspeed on the ground and 400 feet radio altitude.
WXR SYSTEM - PWS DISPLAYS
EFFECTIVITY
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New PWS warnings are inhibited between 100 knots computed
airspeed and 50 feet radio altitude.
These inhibits apply to both takeoff and approach modes.
NOTE: These inhibits do not remove a PWS caution or warning
that already exists.
Sweep Patterns
The antenna sweep is the same for takeoff and approach PWS
modes. The PWS changes the sweep when PWS is active. Both
WXR and PWS sweeps decrease to -60 to +60 degrees.
PWS and WXR Sweep Pattern
Position Dir Radar
Sweep
Paint
Sweep
Angle
(Degrees)
Time
Sweep 1 L-R Capt WXR
data
updated
Capt WXR
+ icon
painted
-60 to +60 3
Sweep 2 R-L Both PWS
data
updated
None +60 to -60 3
Sweep 3 L-R F/O WXR
data
updated
F/O WXR
+ icon
painted
-60 to +60 3
Sweep 4 R-L Both PWS
data
updated
None +60 to -60 3
The sweep pattern may go to a PWS only mode during takeoff
and approach when WXR is not selected and PWS is
automatically activated. The scan is -60 to +60 degrees.
PWS Sweep Pattern
Position Dir Radar
Sweep
Paint
Sweep
Angle
(Degrees)
Time
Sweep 1 L-R None None N/A 3
Sweep 2 R-L Both PWS
data
updated
None +60 to -60 3
Sweep 3 L-R None None N/A 3
Sweep 4 R-L Both PWS
data
updated
None +60 to -60 3
WXR SYSTEM - PWS DISPLAYS
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-43-00-026
WXR SYSTEM - PWS DISPLAYS
WXR SYSTEM - PWS DISPLAYS
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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WXR System Alert Messages and Display
Alert messages show on the ND when the R/T processes data
that is not satisfactory. The WXR display will continue to show
with an alert message.
Only one alert message shows on the ND. When the R/T
processes unsatisfactory data from more than one source only
the highest priority message shows. These are the alert
messages and priority from highest to lowest:
* WXR WEAK shows for an R/T gain calibration failure
* WXR ATT shows when the selected attitude input fails
* WXR STAB shows when stabilization is off.
The alert messages show on these alert lines:
* Line 1 shows WXR in amber
* Line 2 shows WEAK, ATT, or STAB in amber.
WXR System Fail Messages and Display
A failure of these components causes a WXR failure:
* R/T
* WXR control panel
* WXR antenna.
A WXR failure causes these conditions:
* WXR FAIL message shows on ND
* Mode, tilt, and gain messages go out of view
* WXR display goes out of view.
The fail message shows on these alert lines:
* Line 1 shows WXR in amber
* Line 2 shows FAIL in amber.
A failure of these components will cause a PWS failure:
* Loss of any RA
* Loss of ADR data
* Loss of IR data
* Scan and tilt antenna faults
* Internal WXR system faults
* Loss of CAS and TAS.
A failure of the predictive windshear causes an amber PWS
FAIL message on the ND.
WXR SYSTEM - OPERATION - FAILURE DISPLAYS
EFFECTIVITY
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WXR SYSTEM - OPERATION - FAILURE DISPLAYS
WXR SYSTEM - OPERATION - FAILURE DISPLAYS
EFFECTIVITY
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General
The DEUs compare the ND ranges from these components:
* EFIS CP
* WXR R/T
* Flight management computer (FMC).
A difference between any of these ranges causes an amber
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