Piper SEMINOLE PA-44-180, Maintenance Manual

Page: 757 / 881

GENERAL.
DESCRIPTION AND OPERATION.
The turbocharger system (Figure 81-1) consists of a turbine and compressor assembly, ground adjustable
exhaust bypass screw and the necessary hose and engine air intake ducts. The ground adjustable exhaust bypass
screw allows some exhaust gas to bypass the turbine and flow directly overboard. The turbocharger requires little
attention between overhauls. However, it is recommended that the items outlined in the Inspection Report be
checked periodically.
— CAUTION —
EXTREME CARE SHOULD BE EXERCISED AT ALL TIMES WHILE
S E RVICING OPERATING TURBOCHARGERS. KEEP FINGERS AND
FOREIGN OBJECTS AWAY FROM OPENINGS. AVOID CONTACT WITH
HOT SURFACES.
O P E R ATION 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.
TROUBLESHOOTING.
CHART 8101. TROUBLESHOOTING (TURBOCHARGER)
Trouble Cause Remedy
Manifold pressure low or Restriction in duct between air Remove restriction.
fluctuating. cleaner and turbocharger.
Aircraft cannot reach critical Restriction in duct between Remove restriction.
altitude. compressor and engine intake
manifold .
Restriction in engine exhaust Remove restriction.
system after turbocharger.
Restriction in engine intake or Refer to appropriate engine
exhaust manifold. manufacturers maintenance
manual.
Pressure relief valve opens at too Recalibrate or replace relief
low of a pressure. valve.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
8 1 - 0 2 - 0 0
Page 81-01
Revised: May 15, 1989
3J3
PIPER AIRCRAFT