In addition, the ADI provides displays, which are used for navigation,
approach, and speed. A V-command bar provides computed pitch and roll
attitude commands. During approach, LOC deviation is displayed by a rising
runway symbol, and deviation from glideslope is shown on a glideslope
deviation display. The rising runway symbol commences to rise when
actuated by the radio altimeter at approximately 200 feet AGL. A DH
(decision height) light is provided on the ADI to advise the crew that the
airplane is at decision height
Standby Attitude Director Indicator
A standby attitude director indicator is provided. The indicator is powered by the DC transfer bus and will operate if generator power is lost.
Weather Radar System
MD-80 aircraft are equipped with a Collins WXR-700 weather radar receiver/transmitter and a Bendix PPI-4B indicator intended to interface with the Bendix TCAS II system. Controls to operate the weather radar are located on the indicator. The following are descriptions of the controls.
A color weather radar system displays weather and ground targets with selective ranges of 10, 20, 40, 80, 160, and 320 nautical miles. All controls for the weather radar system are located on the top perimeter of the weather radar indicator.
Controls are provided to initiate power to the system, to select antenna stabilization, and to select desired mode of operation, range, and display variation. Control knobs are provided to adjust antenna tilt angle, system gain, and brightness of the indicator display. A test mode is provided for testing the system. A TCAS pushbutton switch alternately selects TCAS only display, or combined weather TCAS display, or weather-only display. A message pushbutton switch operates in conjunction with ACARS. Switch is not functional.
The radar antenna is normally stabilized in pitch and roll by VG 2, and is controllable from 15 degrees up to 15 degrees down in 0.25-degree increments. If required, the aux vertical GYRO (if installed) can be selected for input to the antenna by placing VERT GYRO selector in R ON AUX.
When operating in WX (weather) mode, the digital indicator presents weather in red, yellow, green, and black colors. Red represents areas of high density precipitation. Yellow represents areas of lower density precipitation. Green represents areas of light precipitation. Black represents areas of extremely light precipitation.
When operating in the MAP (mapping) mode, the indicator presents ground targets in yellow, green and black colors. Yellow represents targets with high level reflectivity, green represents targets with lower level reflectivity, and black represents targets with low level reflectivity.
The indicator displays messages for selected mode of operation, system faults, stabilization status, clutter suppression, and gain. The indicator also displays readouts for selected up or down antenna tilt angle and for selected range.
Continental
Rev. 12/01/00 #29 Flight Manual
Radar Controls
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Bright Knob Adjusts indicator display intensity.
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TCAS Pushbutton Switch
Alternately selects TCAS-only display, or combined weather/TCAS display, or weather-only display.
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Range/Marks Selector 10 -10 nautical mile (NM) range / 2 1/2 NM marks. 20 -20 nautical mile (NM) range / 5 NM marks. 40 -40 nautical mile (NM) range / 10 NM marks. 80 -80 nautical mile (NM) range / 20 NM marks.
160 -160 nautical mile (NM) range / 40 NM marks.
320 -320 nautical mile (NM) range / 80 NM marks.
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Gain Knob AUTO - Used in weather (WX) mode. Gain is pre-adjusted.
MANUAL (MIN/MAX) - Controls gain when in MAP mode or in WX mode when auto gain malfunctions.
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Mode Selector OFF -Radar system is de-energized. TEST -Turns system on and displays test pattern. System is not radiating energy. WX -Normal position for weather detection. WX/T -Weather detection with turbulence detection.
MAP -Used for terrain mapping. Use manual gain to achieve
best picture.
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Message Pushbutton Switch Operates in conjunction with ACARS. Switch is not functional.
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Antenna Tilt Knob Adjusts antenna tilt up (+) or down (-) 15. from horizontal.
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Stabilization Off Switch Disables antenna stabilization.
Fault Indications
Fault annunciations will appear on the radar screen automatically if a system fault is detected. Faults may be either Soft Failures or Hard Failures.
Soft Failures are those that can cause limited system operation. Radar data will continue to be displayed, but the flight crew should be aware that the display does not accurately represent the weather.
Hard Failures are those that occur when a major function of the system is lost. Hard Failures are typically a total loss of transmitter power, receiver gain, or no antenna scan. Should a Hard Failure occur, the system should be turned off or further damage to other system components could occur.
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