Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 1095 / 1956

PAGE 5
Feb 28/07 6D1
37-00-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
CHART 1 (Sheet 1 of 2)
TROUBLESHOOTING VACUUM SYSTEM
( for S/N’s 4636021 thru 4636374, see also Chart 1 in 77-40-00 )
Trouble Cause Remedy
Attitude gyro(s) not receiving Filter clogged or dirty. Clean or replace filter.
sufficient vacuum for proper
operation. Low reading on
Line from gyro to filter Check line.
vacuum gauge. restricted.
No vacuum gauge indication, Faulty gauge. Replace gauge.
but gyro instrument(s) operating
satisfactorily.
Low vacuum system Filter dirty. Clean or replace filter.
pressure indicated by low
reading on vacuum gauge.
Vacuum regulator valve Adjust regulator valve in
incorrectly adjusted. accordance with
Adjustments in this section.
Line from gyros to filter Repair or replace line.
restricted.
Line between pumps and Check all lines and
manifold, or between gyros fittings.
and manifold leaking.
In S/N’s 4636001 thru 4636020
only:
Vacuum gauge reading 4.8 to Clockwise rotating vacuum Replace lower vacuum
5.2 in. Hg, but left red button pump inoperative. pump.
on gauge protruding
or
Vacuum gauge reading 4.8 to Counterclockwise rotating Replace upper vacuum
5.2 in. Hg, but right red vacuum pump inoperative. pump.
button on gauge protruding.
Zero vacuum gauge reading. Both pumps faulty. Replace pumps.
Both red buttons protruding. Faulty vacuum pressure switch. Replace switch.
Normal pressure indication, Faulty instrument. Replace instrument.
but sluggish operation
of instruments.
High system pressure. Vacuum regulator Adjust regulator.
incorrectly adjusted.
Vacuum regulator sticking Clean and check operation
or dirty screen. of regulator.