NORM/TEST Switch NORM - Monitor light comes on when tran-sponder is being interrogated by a ground station. TEST - If transponder is operating correctly the monitor light will come on. NOTE In center off posi-tion, monitor light is inoperative.
IDENT (Identification) Button Used only on request of ground controller. when pushed, an identification signal is transmitted for approximately 20 seconds.
STBY ON BC
SENS
ATC AD
OFF LO
210
ALT NORM TFR RPTG
12
TEST IDENT OFF
ATC TRANSP
MONITOR
LIGHT
Mode Selector Will usually be set to mode
A. Mode B may be requested at the option of the ground controller. The selector is locked out of the C and D positions.
ATC TRANSPONDER CONTROL PANEL
ALT RPTG (Altitude Reporting) Switch
OFF - Disables altitude reporting function.
NOTE
With switch in off, transponder will transmit an invalid data reply of “000” in response to inter- rogation.
ALT
RPTG - Transponder will transmit a reply giving altitude of airplane in response to interrogation.
CODE Selector Knobs (2)
Used to select desired reply code which is visible in CODE readout. Left knobs select first and second digits. Right knobs select third and fourth digits.
TFR (Transfer) Switch
Used to select either ATC transponder 1 or ATC tran-sponder 2.
MD801627
INSTRUMENTATION AND NAVIGATION - CONTROLS AND INDICATORS
NAVIGATION SYSTEMS
MD-80 Rev. 12/01/00 #29 Continental Flight Manual
INSTRUMENTATION AND NAVIGATION - CONTROLS AND INDICATORS
NAVIGATION SYSTEMS
MODE 1 - EXCESSIVE DESCENT RATE
2450 FT
2500
RADIO ALTITUDE – FEET RADIO ALTITUDE – FEET
2000
1500
1000
500
0
VISUAL INDICATION - GPWS light on.
AURAL/VOCAL ANNUNCIATION - “SINK RATE, SINK RATE” (Repeated every 0.75 seconds.) “WHOOP WHOOP-PULL UP” (Continuous)
MODE 2 - EXCESSIVE DESCENT RATE
-1000 -2000 -3000 -4000 -5000 -6000 -7000 -8000
SINK RATE – FEET PER MINUTE
This mode indicates rate of descent for given altitude excessive and condition should be corrected. Any excessive sink rate (barometric altitude) below 2450 feet radio altitude actuates aural/vocal annunciation. Mode is independent of aircraft configuration and is functional to without feet terrain.
AIRCRAFT NOT IN LANDING CONFIGURATION
2450 FT 0.45
MACH 2500
0.35 MACH 1500
2000
1000
500
50
VISUAL INDICATION - GPWS light on.
AURAL/VOCAL ANNUNCIATION - “TERRAIN - TERRAIN” (Rapid succession.) “WHOOP WHOOP-PULL UP” (Repeated every 0.75 seconds.) “TERRAIN - TERRAIN” will be activated first. If rate of descent continues or increases, “WHOOP WHOOP-PULL UP” will be activated.
MD801628
TERRAIN CLOSURE RATE – FEET PER MINUTE
After closure continuation ceases, and “PULL UP” annunciation has stopped, a barometric altitude gain of 300 feet is required before the “TERRAIN” annunciation (repeated in 0.75 second cycle) is shutoff. during an approach, when gear or flaps are extended, the altitude gain function is inhibited and the “PULL UP” annunciation is replaced by “TERRAIN”.
INSTRUMENTATION AND NAVIGATION - CONTROLS AND INDICATORS
GROUND PROXIMITY WARNING SYSTEM WARNING ANNUNCIATION
MD-80
Rev. 12/01/00 #29 Continental
Flight Manual
MODE 3 - Altitude Loss After Takeoff
VISUAL INDICATION - GPWS light on. AURAL/VOCAL ANNUNCIATION - “TOO LOW GEAR” (Repeated in
0.75 second interval cycle.) “TOO LOW TERRAIN” (Repeated in
0.75 second interval cycle.)
MD801629
1250
1000 750 500 250
0
0 1020304050607080
PRESSURE ALTITUDE LOSS - FEET
altitude to the altitude of initial descent. If aircraft should descend again before climbing to initial altitude, another warning will be generated, based on original altitude. The warning threshold is when 10% (approx.) of the active from 65 feet to 700 feet AGL during takeoff or when either flaps or gear is raised during a missed approach from below 200 feet AGL. Above 700 feet, the GPWS computer automatically switches to TERRAIN CLEARANCE Mode.
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