.
altitude deviation less than 250 feet, or
.
altitude deviation more than 750 feet, or
.
new MCP altitude selected.
Copyright . The Boeing Company. See title page for details.
15.10.4 June 4, 2004
Warning Systems -Controls and Indicators 737 Operations Manual
GPWS Controls and Indicators
PULL UP
BELOW G/S P-INHIBIT
PULL UP WARNING LIGHT
Illuminated (red) – indicates one or more of the following exist:
.
excessive descent rate
.
excessive terrain closure rate
.
altitude loss after takeoff or go–around
.
unsafe terrain clearance when not in the landing configuration
BELOW Glide Slope (G/S) Alert Light
Illuminated (amber) – airplane is more than 1.3 dots below glide slope.
Warning Systems -Controls and Indicators
737 Operations Manual
Push – inhibits or cancels below glide slope alerting if pushed while in alerting area.
GPWS Inoperative (INOP) Light
Illuminated (amber) – GPWS computer malfunction or power loss
. invalid inputs are being received from radio altimeter, ADC, ILS receiver,
IRS, FMC, stall warning system, or EFIS control panel.
Ground Proximity System (SYS TEST) Switch
Push –
.
momentarily on ground, or above 1,000 feet radio altitude in flight:
. illuminates BELOW G/S, PULL UP, and INOP lights; displays the EADI WINDSHEAR message; and causes “GLIDESLOPE”, “WHOOP, WHOOP, PULL UP”, and “WINDSHEAR” aurals to sound
.
at least 10 seconds, on ground – above indications always occur first,
followed by any additional aurals, as installed
.
system test is inhibited from lift–off to 1000 feet radio altitude.
GROUND PROXIMITY Flap Inhibit Switch
FLAP INHIBIT – inhibits or cancels warnings/alerts caused by flaps not in 30 or 40 position.
NORMAL (guarded position) – flap position logic is provided for GPWS.
GROUND PROXIMITY Gear Inhibit Switch
GEAR INHIBIT – inhibits or cancels warnings/alerts caused by landing gear not down.
NORMAL (guarded position) – landing gear position logic is provided for GPWS.
GROUND PROXIMITY Switch
FLAP/GEAR INHIBIT – inhibits or cancels warnings/alerts caused by flaps not in 30 or 40 position or landing gear not down.
NORMAL (guarded position) – flap and landing gear position logic is provided for GPWS.
Copyright . The Boeing Company. See title page for details.
15.10.6 December 1, 2000
Warning Systems -Controls and Indicators 737 Operations Manual
EGPWS Controls and Indicators
PULL UP
BELOW G/S P-INHIBIT
PULL UP Warning Light
Illuminated (red) – Indicates that one or more of the following conditions exists:
.
excessive descent rate
.
excessive terrain closure rate
.
altitude loss after take-off or go-around
.
unsafe terrain clearance while not in landing configuration
.
terrain or obstacle warning.
Below Glide slope Alert Light
Illuminated (amber) – Indicates that aircraft is more than 1.3 dots below glideslope Push - inhibits or cancels below glideslope alerting if pushed while in alerting area
Ground Proximity Inoperative [INOP] Light
Illuminated (amber) – GPWS computer malfunction or power loss: invalid inputs are being received from radio altimeter, ADC, ILS receiver, IRS, FMC, stall warning system or EFIS control panel.
Warning Systems -Controls and Indicators 737 Operations Manual
GPWS System Test [SYS TEST] Switch
Proper operation of the Enhanced Ground Proximity Warning System may be
verified when the aircraft is on the ground as follows: Ensure that the TERR INHIBIT switch is set to NORM, WXR (EHSI Control Panel) is ON, Weather Radar is in TEST mode, and EHSI selected to a mode which allows the display of weather radar information (EXP NAV, EXP VOR/ILS, MAP, or CTR MAP): Momentarily push the Ground Proximity SYS TEST switch –
.
amber Ground Proximity INOP light and Terrain Display Select INOP lights illuminate
.
amber BELOW G/S lights illuminate
.
aural GLIDESLOPE message is annunciated
.
amber BELOW G/S lights extinguish
.
red PULL UP lights illuminate
.
aural PULL UP message is annunciated
.
red PULL UP lights extinguish
.
siren and aural WINDSHEAR, WINDSHEAR, WINDSHEAR
message is annunciated
