Piper Comanche PA-24 Service Manual page 467

PIPER COMANCHE SERVICE MANUAL
e. Mount propeller on eDgine. Screw each stud (7) intO its matinS
flaqe
bushing a
few
thrnds
at
a
time until all are tight. Torque bolts to specifications si"cn in Table
VilA·!.
Safety the mounting bolts with
MS20995C41 wire. routinS the wire through the lock pills (8).
f. Cbeck blade mck
pet
pangn;>h 7,\·22.
g. Check low pitch blade angle. (Refer to paragraph 7A·21.)
b.
I nsWl eDJlIIe cowling if remo.ed.
i. Install spinner
(1)
and secure with screws.
7A·21. Adjusana" Of Low Pircb Blade ADtle Stop.
a. Tbe propeller com .. from ,he factory with the low pitch stOp adjusted for proper blade angle. If.
bowever. this adjustment
bas
been disturbed. the following procedure is si"cn for obtaining blade angle,
1.
The blade angle (Refer to Table Vll,\·[) is dermnincd by placing a propeller protractor on the
face side of the propeller.
at
the 30 inch station. as measured from the bub center line. Tbe blade must be
horizontal.
2. The low pitch stop adjwanent is made by a screw in the nose of the propeUer cylinder.
Roatin, the screw dockwlSC inc:reun the low pitch and reduces the
Static
RP.\t
by abou.t
100 RPM. for
ea.ch
half
rum; or vice versa.
b. After the low pitch StOp bas been adjusted for proper blade angle. the go.emor should then be
adjusted
'0
obtain maxunum rared engine RPM dunng rake-off and climb as descnbed
ui
paragrapb 7 A·27.
7 ,\·22. Blade T"",k. Blade traCk is the ability of ODe blade tip
to
follow the other. wbile rotating. in
almost che
sanlC
plane. Excessive difference
in
blade ttack . more than .0625 inch·
alay
be an indkatlon of
bent bladeS or improper propeUer installation. Check blade traCk as foUows,
a.
With
the cngine shu.t down and blades vmica.1. secure to the wcnft a smooth baud
JUSt
under
the
tip oi ,be lower blade .. \Io.e the tip iore and att througb
Its
fuU "bl.de1hake" myel. making small marks
Wltn 1
pcncLi
at
each
posit10n.
Then center che np between these marks
Uld
scribe a. line on the board for
'he full width of the "p.
b. Carefully rota.te propeUer by hand co bnng the opposite blade down. Center the tip and scnbe a
pencil line as before ~d check that hnes are not separated more
th:ut
.0625 inch.
c. Propellers having e:'tceu blade crack should be removed and inspected for bent blades or for partS
of sheared "0" nng. or forcign ?articles. which have lodged between h'ub and .;:rankshait mouncing bces
Bent blades will require repair and overhaul of a.s.scmbly
2
C13
POWER PLANT
ISSUED: 8/18172