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

Page: 300 / 1956

PAGE 4
Feb 28/07
2C22
21-30-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
CHART 1 (Sheet 2 of 3)
TROUBLESHOOTING (PRESSURIZATION SYSTEM)
Trouble Cause Remedy
Cabin altitude decreases Low aircraft vacuum supply. Check aircraft vacuum
below selected altitude. supply.
Minor leak in tube between Remove and replace tube
controller and volume tank or volume tank.
or in volume tank.
Minor leak in tube between Remove and replace tube
controller and isobaric valve or isobaric valve.
or in isobaric valve.
Minor leak in the controller. Remove and replace
controller.
Minimum rates unbalanced. Minor leak in tube between Remove or replace tube
Down rate faster than up controller and volume tank or volume tank.
rate. or in volume tank.
Minor leak in the controller. Remove and replace
controller.
Pressurized operation Solenoid valve malfunction Replace valve.
before takeoff and in the closed position.
after landing.
Landing gear safety switch/ Remove and replace
dump switch malfunction in the switch.
open position.
Broken wiring to the Repair wiring.
solenoid valve.
Loose or damaged pneumatic Check tube connections or
tube between solenoid valve replace damaged tube.
and safety valve.
Internal malfunction in the Remove and replace valve.
safety valve.
Cabin exceeds full positive True static atmosphere tube Securely connect or
differential calibrated blocked or not connected on remove blockage from
setting. isobaric valve and safety the true static atmosphere
valve. tube on isobaric valve and
safety valve.
Loose or damaged pneumatic Repair or replace tubing.
tubing from port “1” of
safety and isobaric valve to
atmosphere.
Cabin climbs and descends Internal malfunction in Remove and replace
at a fixed rate regardless controller. controller.
of rate selection.