Propeller Unfeathering System; Accumulator Service - Piper PA-44-180 SEMINOLE Maintenance Manual

PROPELLER UNFEATHERING SYSTEM.

The optional propeller unfeathering system provides a means for storing air and oil pressure in an
a c c u m ulator so that the propeller may be moved out of the feathered position when so desired. Refer to the
Pilot's Operating Handbook for proper operating procedures.

ACCUMULATOR SERVICE.

WHEN REMOVING THE UNIT FROM THE AIRPLANE,
COMPLETELY DISCHARGE ALL NITROGEN PRESSURE
BEFORE DISCONNECTING THE OIL LINE, .
This is a free piston type accumulator that is charged with nitrogen to a working pressure of 90 to 100 psig
at normal room temperature. Accumulator overhaul should coincide with governor overhaul. Refer to
McCauley — Service Manual No. 780401 for detailed instructions.
General servicing of the accumulator during its use between overhauls consists of periodically checking
the nitrogen charge and visually inspecting the unit for any oil leaks. Refer to the Pilot's Operating Handbook
for proper operational check procedure.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— WARNING —
THIS SPACE INTENTIONALLY LEFT BLANK
3D17
61-10-00
Page 61-15
Revised: June 20, 1995