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PA-46-350P, MALIBU
SECTION 3 - EMERGENCY PROCEDURES (continued)
YELLOW DU ANNUNCIATION
Yellow DU annunciation indicates a failure of the EHSI cooling fan. If a
fan failure occurs in flight, monitor the display presentation for an abnormal
appearance which will indicate impending failure. System heating can be
reduced by lowering the brightness of the presentation. Although an EHSI
failure is unlikely, consideration should be given to securing power to the EHSI
30 minutes after failure and flying by reference to alternate instruments. The
EHSI can be disabled by pulling the EHSI circuit breaker.
EHSI MISSING OR ABNORMAL DATA DISPLAY
If the data on the EHSI is missing or appears abnormal in flight, refer to
alternate instruments for usable data for the remainder of the flight.
SECTION 4 - NORMAL PROCEDURES
PREFLIGHT CHECK
After engine start and radio master switch is ON, adjust the BRT knob to
obtain a desirable brightness level of the EHSI display. After a two minute
warm-up, press the TST/REF button for 3 seconds and release to activate the
system self test and view all the fault presentations. A SELF TEST PASS or
SELF TEST FAIL message will be annunciated. If the system is operating
properly, SELF TEST PASS will be annunciated. If a malfunction exists, SELF
TEST FAIL will be annunciated and the system should be serviced. To clear,
press TST/REF button again. Additionally, the pilot should ensure that the
compass scale is white, which indicates that all three colors are operational in
the display unit.
ISSUED: FEBRUARY 23, 1999
SECTION 9
SUPPLEMENT 8
REPORT: VB-1710
7 of 26, 9-49
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