Piper Navajo PA-31 Service Manual page 465

WARNING
Before performing any service functions on the propeller, ascertain
that the master switch is "OFF", the magneto switches are "OFF"
(grounded) and the mixture control is in the "IDLE CUT-OFF"
position.
CAUTION
Under no condition should blade arms be used on this propeller.
8-16. REMOVAL OF PROPELLER. (Refer to Figure 8-3.) This includes all
propellers, standard and with
spring back up kit installed, identified by a letter "T" in the dash number.
NOTE
When removing the propeller, it is unnecessary to remove the
spinner, feather the blades, or remove the air charge. When the
propeller is removed for service or over haul, the propeller with
the spring kit installed should be feathered on the aircraft (See
CAUTION following) and the spinner on either prop must be
removed.
WARNING
Do not attempt to disassemble the propeller assembly any further
than stated in this manual. Only personnel at a certified repair
shop are authorized for repair and overhaul of the propeller
mechanism.
CAUTION
Prior to performing any work on the propeller, ascertain that the
master switch and magneto switches are off (grounded) and the
mixture control is in the "IDLE CUT-OFF" position.
CAUTION
Under no condition should blade arms be used on either propeller,
except to unfeather a propeller with the spring kit installed. If a
propeller is to be feathered on the ground, it should be done with
the engine operating, by use of the propeller control on the
throttle quadrant.
NOTE
In some manner identify the position of each part in relation to
the other to facilitate installation.
Revised: 11/15/82
POWER PLANT
2H15
PIPER NAVAJO SERVICE MANUAL