Internal Input Monitoring

The BITE monitors these things:

· Over temperature from the power supply

· Control and range from the WXR panel on control bus 0

· Range inputs from the EFIS control panels on control bus 1 and 2

· Antenna scan and elevation position from the CPU.

WXR SYSTEM - SELF-TEST START

General

WARNING: DO NOT OPERATE THE WEATHER RADAR WHILE FUEL IS ADDED OR REMOVED FROM THE AIRPLANE. DO NOT TRANSMIT RF ENERGY WHILE FUEL IS ADDED OR REMOVED IN AN AREA 300 FEET OR LESS IN FRONT OF THE ANTENNA. THIS CAN CAUSE AN EXPLOSION.

WARNING: MAKE SURE NO PERSONS ARE IN THE AREA 50 FEET OR LESS FROM THE ANTENNA WHEN IT TRANSMITS RF ENERGY. RF ENERGY CAN CAUSE INJURIES TO PERSONS.

CAUTION: MAKE SURE NO LARGE METALLIC OBJECTS ARE CLOSER THAN 300 FEET FOR THE 180-DEGREE AREA IN FRONT OF THE AIRPLANE WHEN THE RADAR OPERATES. LARGE METAL OBJECTS CAN INCLUDE HANGARS, TRUCKS, OR OTHER AIRPLANES. DAMAGE TO THE TRANSCEIVER COULD OCCUR IF OBJECTS ARE IN THIS AREA. THIS DOES NOT APPLY WHEN THE WEATHER RADAR OPERATES IN THE TEST MODE.

Test Preparation

On the WXR control panel, select these functions:

· Set the mode selector to the TEST position.

· Set the tilt control to 0 degrees.

· Set the gain control to the Auto position.

On the EFIS control panel, select these functions:

· Set the range selector to the 40 NM position.

· Set the mode selector to the correct ND mode (expanded APP, expanded VOR, expanded MAP or centered MAP).

Also, adjust the inner ND brightness control to the middle position.

Test Start

Push the WXR switch on the EFIS control panel to apply power to the WXR R/T.

WXR SYSTEM - SELF-TESTILF

Training Information Point

During a test, the weather radar (WXR) system transmits a few pulses to let the BITE monitor the operation. Do not do a test of the WXR system in a hanger. Make sure the nose of the airplane points away from buildings and other aircraft or large metal objects.

Test Preparation

On the WXR control panel, select these functions:

· Set the mode selector to the WXR position

· Set the tilt control to 0 degrees

· Set the gain control to the AUTO position.

On the EFIS control panel, select these functions:

· Set the range selector to 40 NM

· Set the mode selector to the correct ND mode (expanded

APP, expanded VOR, expanded MAP or centered MAP).

Also, adjust the inner ND brightness control to the middle

position.

Test Start

On the EFIS control panel, push the WXR switch to apply power to the WXR R/T. On the WXR control panel, set the mode selector to the TEST position to start the test.

NOTE: If the WXR mode selector is in the TEST position before you apply power to the WXR R/T, you must set the mode selector to another mode and then set the mode

selector to TEST to start the test.

Test Operation

During the test, these things happen:

· R/T transmits a few pulses to let the BITE monitor for correct operation

· R/T makes a test pattern and sends it to the DEU to show on the NDs

· R/T sends test messages and mode, gain, and tilt information to the DEUs to show on the NDs

· WXR test pattern shows on ND.

The PWS symbol shows in the TEST pattern. If PWS finds a windshear threat while in TEST mode, the test stops. PWS then shows the actual display data and alert annunications.

The test pattern shows until you select another mode on the WXR panel or EFIS control panel.

Test Pass

For a valid WXR self-test, CDS shows these displays:

· WXR test pattern

· Amber WINDSHEAR message on ND

· Aural message - MONITOR RADAR DISPLAY

· Red WINDSHEAR message on ND and PFD

· Aural message - GO AROUND, WINDSHEAR AHEAD, (pause) WINDSHEAR AHEAD, WINDSHEAR AHEAD

· WXR on alert message line one

· TEST on alert message line two.

Test Fail

For a test that fails, these are the indications on the ND:

· WXR test pattern does not show

· WXR shows on alert message on line one

· FAIL shows on alert message on line two

· Line three shows all of the failures.

These are the messages that can show on line three:

· R/T - receiver/transmitter fault

· ANT - antenna fault

· CONT - control panel fault

· ATT - attitude input fault

· WEAK - calibration fault.

There is no Aural output from WXR if the test fails.

Date: 2016-01-14; view: 980