.
Receiver/Transmitter Cooling Warning (Yellow) COOL is displayed if receiver transmitter experiences a cooling fault.
.
Mode Selected (Blue) WX, WX/T or MAP as selected.
.
Range (Blue) Displays selected range.
.
Range Marks (Blue) Displays range mark intervals.
.
Antenna Tilt (Blue)
Displays selected degrees of tilt angle and an up or down vertical arrow.
STAB (Yellow)
Indicates stabilization fault.
STAB (Blue) Stabilization switch is off or attitude plus tilt setting exceeds excursion limits.
. CAL (Yellow)
Out of calibration. Receiver / transmitter performance below calibration level.
CAL (Blue) Out of calibration. Gain Control not set to AUTO in WX, WX/T or MAP mode.
. GAIN (Blue)
Indicates relative position of GAIN control when out of AUTO in WX or WX/T mode.
MIN - minimum gain.
1 - 9 Relative gain in increasing increments.
MAX - maximum gain.
. LRU Fault Warning Location (Yellow) Identifies faulty line replaceable unit (system component).
MD-80
Continental
Rev. 12/01/00 #29 Flight Manual
Weather Modes Message Format
The weather modes message format is shown below.
TCAS STBY (Blue) TCAS system in standby
TEST (Blue) TCAS system in TEST
TA/RA (Blue) TA/RA Mode
TA/RA AUTO (Blue) TA/RA Pop-Up Mode
TA ONLY (Blue) TA Only Mode
TA AUTO (Blue) TA Only Pop-Up Mode
TD FAIL (Yellow) Indicator Failure
NO TCAS (Blue) TCAS not operational. Place Function
Selector to TCAS for a list of faults.
TCAS FAIL (Yellow) Failures include: TCAS Processor or Top or
Bottom TCAS Antenna. Place Function
Selector to TCAS for a list of faults.
FLXXX (Cyan) ABSOLUTE ALTITUDE where XXX is own
altitude. Field is bland for relative altitude.
PREDICTIVE WINDSHEAR SYSTEM
Introduction
FAR 121.358 requires installation of an airborne windshear warning and flight guidance system, an approved airborne detection and avoidance system, or an approved combination of these systems. Since 1990, Continental in association with Allied Signal Corporation, has participated in the development of the RDR-4B Forward Looking Windshear Detection / Avoidance Weather Radar System.
RDR-4B Radar System Theory
Like all modern radar systems, the RDR-4B operates by emitting short intense pulses of microwave energy which are reflected by objects having reflective characteristics within the range of the system. The reflected signals are processed to produce visual displays that are representative of the size, intensity, bearing and distance of the targets. The RDR-4B incorporates an advanced microprocessor design which utilizes the Doppler principle to identify areas of moderate and higher turbulence as well as low level windshear (microburst) activity. The RDR-4B system is designed to operate in the windshear mode automatically any time the aircraft is below 1500’ AGL, at least one engine is running, and the transponder is not in OFF or STBY, REGARDLESS OF RADAR MODE SELECTED. The system also operates in the windshear mode below 1500’ AGL using an alternate scan technique if the radar is operating in any mode (WX / TURB, WX, MAP). The windshear mode is activated at 2300’ AGL. However, no alerts or displays are annunciated above 1500’ AGL.
WARNING: Failure to return the transponder to STBY after landing or
selecting any mode except STBY prior to leaving the ramp
area allows the radar to operate in the windshear mode
creating a radiation hazard to personnel on the ground.
The RDR-4B radiation hazard area extends 13.4 feet from
the radar antenna in a 120 degree arc left and right of the
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