Typical Nicks And Removal Method - Piper Navajo PA-31 Service Manual

EXAGGERATED VIEW OF
NICK IN LEADING EDGE
PIPER NAVAJO SERVICE MANUAL
f. Charge the cylinder through valve (9) with dry air or nitrogen gas to the prescribed pressure. Refer to the
placard in the spinner cap (1) or Table VIII-I of this manual for an exact pressure for the existing temperature.
It is most important that an accurate air charge be maintained. Observe all CAUTIONS.
CAUTION
1. When Schrader air valve No. 625 in the cylinder dome
assembly requires valve core replacement, DO NOT USE low
pressure automotive type valve core.
2. Do not check pressure or charge with PROPELLER in feath-
ered position.
3. To obtain an accurate pressure reading when checking pro-
peller dome air pressure or to insure complete release of all air
pressure, place the propeller CONTROL in the feather detent
before measuring or releasing propeller air pressure. This proce-
dure will insure the free flow of all air within the prop dome and
prevent possible error in pressure readings or injury to service
personnel should the low pitch stop be removed .
g. Test for leakage by using a soap solution or equivalent and applying it around the valve stop and at the
aft end of the tube. Internal leakage will show up as flow of air through the tube.
h. Install spinner cap and cowling.
EXAGGERATED VIEW OF
SURFACE CRACK
EXAGGERATED VIEW OF
NCK IN FACE OF BLADE
CROSS-SECTION
BEFORE REPAIR
BLEND DEEPEST PORTION
OF NICKS INTO LEADING
EDGE ALIGNMENT WITH
SMOOTH CURVES
CROSS-SECTION
AFTER REPAIR
NOTE RECOMMENDED METHOD FOR REMOVING NIC
CRACKS,AND SCRATCHES ISBYUSNG RFFLE
RLEAND/OR CROCUS CLOTH.
Figure 8-4. Typical Nicks and Removal Method
Revised: 2/18/94
POWER PLANT
2H18