Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual page 1147

Trouble
Regulator cannot be adjusted
to produce correct pressure.
Vacuum correct on ground,
but will not maintain pressure
at altitude.
Vacuum correct, but pilot
reports pressure erratic or
shows complete loss in flight.
Pressure can only be maintained
at full throttle on ground.
Vacuum display indication
follows engine rpm.
Vacuum display shows
pressure drop.
(Cabin pressure gauge may
show increase.)
6D13
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
CHART 1 (Sheet 2 of 2)
TROUBLESHOOTING VACUUM SYSTEM
(see also Chart 1 in
Cause
Lines leaking or blocked.
Check valve faulty (i.e. - closed).
Blocked bleed air nozzle
in ejector.
Regulator sticky.
Regulator sticky.
Leak in system.
Stuck regulator.
Foreign matter on
regulator seat.
Blocked bleed air nozzle
in ejector.
Check valve faulty (i.e. - closed).
Vacuum regulator faulty
or secondary flow inlet
is blocked.
Lines from ejector to
vacuum regulator blocked
or leaking.
77-40-00)
Check lines and fittings.
Repair or replace, as
required.
Replace check valve.
Remove ejector and
blow out nozzle.
Clean regulator.
Check ambient reference
line and transducer for
contamination by
cabin air.
Clean regulator.
Check lines and fittings.
Repair or replace, as
required.
Clean or replace regulator.
Raise regulator diaphragm
with thin, blunt tool
(tongue depresser).
Remove the contaminant.
Reset regulator. If no
foreign matter is present
on the regulator seat, test
regulator function.
Remove ejector and
blow out nozzle.
Replace check valve.
Replace regulator and/or
clear inlet.
Check lines and fittings.
Repair or replace, as
required.
37-10-00
Remedy
PAGE 7
Apr 15/07