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

Page: 1535 / 1956

PAGE 3
Feb 28/07 7K17
81-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
CHART 1 (Sheet 2 of 3)
TROUBLESHOOTING TURBOCHARGER SYSTEM
Trouble Cause Remedy
Engine will not deliver Turbocharger impeller Check bearings. Replace
rated power. (continued) binding, frozen or turbocharger.
fouling housing.
Piston seal in actuator Remove and replace
leaking. Usually actuator or disassemble
accompanied by oil and replace packing.
leakage at drain line.
Critical altitude Controller not getting Check pump outlet
lower than specified. enough oil pressure to pressure, oil filters, external
close the exhaust bypass. lines for leaks or
obstructions.
Chips under metering valve Replace controller.
in controller holding it open.
Metering jet in Remove actuator and
actuator plugged. clean jet.
Actuator piston seal If there is oil leakage at
failed and leaking actuator drain, clean
excessively. cylinder and replace piston
seal.
Exhaust bypass valve sticking. Clean and free action.
Engine surges or smokes. Air in oil lines or actuator. Bleed system.
Controller metering valve stem Replace controller.
seal leaking oil into manifold.
Clogged breather. Check breather for
restrictions to air flow.
NOTE: Smoke would be normal if engine has idled for a prolonged period.
High deck pressure. Controller metering valve Replace controller
(Compressor Discharge not opening, aneroid assembly or replace
Pressure) bellows leaking. aneroid bellows.
Exhaust bypass sticking Shut off valve in return
closed. line not working.
Butterfly shaft binding.
Check bearings.
Replace exhaust bypass
valve or correct linkage
binding.
Controller return line Clean or replace line.
restricted.