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

Page: 1536 / 1956

PAGE 4
Feb 28/07
7K18
81-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
CHART 1 (Sheet 3 of 3)
TROUBLESHOOTING TURBOCHARGER SYSTEM
Trouble Cause Remedy
High deck pressure. Oil pressure too high. Check pressure 75 to 85
(Compressor Discharge psi (80 psi desired) at
Pressure) exhaust bypass actuator
inlet. If pressure on outlet
side of actuator is too high,
have exhaust bypass
controller adjusted.
Exhaust bypass valve actuator Remove and disassemble
piston locked in full closed actuator, check condition
position. (Usually accompanied of piston and packing or
by oil leakage at actuator replace actuator assembly.
drain line.)
NOTE: Exhaust bypass normally closed in idle and low power conditions. Should open when
actuator inlet line is disconnected.
Exhaust bypass controller Replace controller.
malfunction.
F. If the turbochargers are installed on a new or overhauled engine, with the initial run-in period not
completed, proceed as follows:
CAUTION: BECAUSE CLEANING OF THE EXTRA SCREENS IS NOT PROVIDED FOR IN
PERIODIC MAINTENANCE PROCEDURES FOR THE ENGINE, THE SCREENS
MUST NOT BE LEFT IN PLACE AFTER THE INITIAL RUN-IN PERIOD. OPERATION
OF THE TURBOCHARGERS WITH CLOGGED SCREENS WILL CAUSE
TURBOCHARGER FAILURE DUE TO LACK OF LUBRICATION.
CAUTION: MAKE ENTRY IN AIRPLANE LOGBOOK TO ENSURE THAT SCREENS ARE
REMOVED AFTER THE INITIAL ENGINE RUN-IN PERIOD HAS BEEN
COMPLETED.
CAUTION: TAG LINES WITH A SUITABLE TAG TO REMIND MECHANIC THAT THE
TEMPORARY SCREENS HAVE BEEN INSTALLED IN THE LINES.
(1) TEMPORARILY install a screen of 100 mesh or finer in the oil supply line to each turbocharger
to trap metal particles from the engine during the initial run-in.
WARNING: OPERATION OF THE TURBOCHARGER WITHOUT ALL NORMALLY
INSTALLED INLET DUCTS AND FILTERS CONNECTED WILL RESULT IN
INJURY TO PERSONNEL AND DAMAGE TO EQUIPMENT FROM FOREIGN
OBJECTS ENTERING THE TURBOCHARGER.
CAUTION: OPERATION OF THE ENGINE AT ANY SPEED FASTER THAN IDLE
IMMEDIATELY AFTER START-UP CAN RESULT IN OIL LAG FAILURE OF
TURBOCHARGER BEARINGS, ESPECIALLY IN COLD WEATHER OR AFTER A
PROLONGED NON-OPERATIVE PERIOD.
(2) Remove the extra screens from the oil supply lines after the initial run - in period.
G. Verify that all air and exhaust inlet ducts and filters are properly installed.