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PRIMUS
R
660 Digital Weather Radar System
A28–1146–111
REV 2
Normal Operation
4-6
Test Mode
The PRIMUS
R
660 Digital Weather Radar System has a self–test mode
and a maintenance function.
In the self–test (TST) mode a special test pattern is displayed as
illustrated earlier in this section. The functions of this pattern are as
follows:
D Color Bands – A series of black/green/yellow/red/cyan/white/
magenta/blue bands, indicate that the signal to color conversion
circuits are operating normally.
The maintenance function lets the pilot or the line maintenance
technician determine the major fault areas. The fault data can be
displayed in one of two ways (selected at the time of installation):
- TEXT FAULT – A plain English text indicating the failure is placed
in the test band
- FAULT CODE – A fault code is displayed, refer to the
maintenance manual for an explanation.
The indicator or EFIS display indicates a fault as noted below.
D Dedicated Radar Indicator – A FAIL annunciation is shown at the
top left corner of the test pattern. It indicates that the built–in test
equipment (BITE) circuitry is detecting a malfunction. The exact
nature of the malfunction can be seen by selecting TEST. (Refer to
Section 8, In–Flight Troubleshooting.)
D EFIS/MFD/ND –Faults are normally shown when test is selected.
NOTES: 1. Some weather failures on EFIS are annunciated
with an amber WX.
2. Some EFIS installations can power up with an
amber WX if weather radar is turned off.
3. If the fault code option is selected, they are shown
with the FAIL annunciation (e.g., FAIL 13).