BELOW Glide Slope (G/S) light
Illuminated (amber) – below glide slope alert is active.
Push – inhibits ground proximity GLIDE SLOPE alert when below 1,000 feet
radio altitude.
Inoperative (INOP) light
Illuminated (amber) – GPWS computer malfunction or power loss
. invalid inputs are being received from radio altimeter, ADIRU, ILS receiver, IRS, FMC, stall management computers, or EFIS control panel.
Copyright . The Boeing Company. See title page for details.
15.10.6 June 1, 2003
Warning Systems -Controls and Indicators 737 Flight Crew Operations Manual
Ground Proximity System Test (SYS TEST) Switch
Push –
.
momentarily on ground:
.
BELOW G/S and GPWS INOP lights illuminate
.
TERR FAIL and TERR TEST show on navigation displays
.
PULL UP and WINDSHEAR alerts illuminate
.
GLIDE SLOPE, PULL UP, and WINDSHEAR aurals sound
.
terrain display test pattern shows on navigation displays
.
terrain caution aural sounds and TERRAIN caution message shows on navigation displays.
.
until self-test aurals begin, on ground, above indications always occur
first, followed by these additional aurals, as described in section 15-20:
.
radio altitude based alerts
.
bank angle alert
.
approach callouts
.
windshear alert
.
look ahead terrain alerts
.
system test inhibited in-flight.
Ground Proximity FLAP INHIBIT Switch
FLAP INHIBIT – inhibits ground proximity TOO LOW FLAPS alert.
NORM (guarded position) – Normal TOO LOW FLAPS alert active.
Ground Proximity GEAR INHIBIT Switch
GEAR INHIBIT – inhibits ground proximity TOO LOW GEAR alert.
NORM (guarded position) – Normal TOO LOW GEAR alert active.
Ground Proximity Terrain Inhibit (TERR INHIBIT) Switch
TERR INHIBIT – inhibits look–ahead terrain alerts and terrain display.
NORM (guarded position) – Normal terrain alerts and terrain display active.
GPWS Terrain Display Select Switch
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Warning Systems -Controls and Indicators 737 Flight Crew Operations Manual
Terrain (TERR) Display Select Switch
Push –
.
shows terrain data in expanded MAP, center MAP, expanded VOR, and expanded APP modes
.
arms terrain data in PLN, center VOR, and center APP modes
.
deselects weather radar display regardless of mode selector position
.
second push deselects terrain display.
Terrain Display
YA613 - YC413, YK101 - YK104
Copyright . The Boeing Company. See title page for details.
15.10.8 June 1, 2005
Warning Systems -Controls and Indicators
YD651 - YD655
Terrain Display
Color and density vary based on terrain height vs. airplane altitude:
.
dotted green: terrain from 2,000 feet below to 500 feet (250 feet with gear down) below the airplane’s current altitude
.
dotted amber: terrain 500 feet (250 feet with gear down) below to 2,000 feet above the airplane’s current altitude
.
dotted red: terrain more than 2,000 feet above airplane’s current altitude
.
dotted magenta: no terrain data available
Copyright . The Boeing Company. See title page for details.
Warning Systems -Controls and Indicators 737 Flight Crew Operations Manual
.
solid amber: look–ahead terrain caution active
.
solid red: look–ahead terrain warning active.
Note: In areas without terrain data, look-ahead terrain alerting and display functions not available. Radio altitude based terrain alerts function normally.
YA613 - YC413, YK101 - YK104
Note: Terrain more than 2,000 feet below airplane altitude or within 400 feet of nearest airport runway elevation does not show.
Automatically shows when:
.
a look–ahead terrain alert occurs, and
.
neither pilot has the terrain display selected, and
.
in expanded MAP, center MAP, expanded VOR, or expanded APP modes. Updates with a display sweep, similar to weather radar display.
Terrain Mode Annunciation
TERR (cyan) – Terrain display enabled (manual or automatic display).
TERRAIN Annunciation YA613 - YC413, YK101 - YK104
TERRAIN (amber) – look–ahead terrain caution alert active.
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