Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 1337 / 1956

PAGE 3
Feb 28/07 7C11
61-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
C. Blade Track
Blade track is the ability of one blade tip to follow the other, while rotating, in almost the same plane.
Excessive difference in blade track - more than 0.0625 inch - may be an indication of bent blades or
improper propeller installation. Check the blade track as follows:
(1) With the engine shut down and blades vertical, secure a smooth board to the airplane just
under the tip of the lower blade. Move the tip fore and aft through its full blade-shake travel,
making small marks with a pencil at each position. Then center the tip between these marks
and scribe a line on the board for the full width of the tip.
(2) Carefully rotate the propeller by hand to bring the opposite blade down. Center the tip and
scribe a pencil line as before and check that the lines are not separated more than 0.0625
inch.
(3) Propellers having excess blade track should be removed and inspected for bent blades, or for
parts of sheared O-rings, or foreign particles, which have lodged between the hub and
crankshaft mounting faces. Bent blades will require repair and overhaul of assembly.
D. Cleaning, Inspection, and Repair
(1) Check for oil and grease leaks.
(2) Clean the spinner, propeller hub interior, exterior, and blades with a non-corrosive solvent.
(3) Inspect the hub parts for cracks.
(4) Steel hub parts should not be permitted to rust. Use aluminum paint to touch up if necessary,
or replate during overhaul.
(5) Check all visible parts for wear and safety.
(6) Check the blades to determine whether they turn freely on the hub pivot tube. This can be
done by rocking the blades back and forth through the slight freedom allowed by the pitch
change mechanism. If they appear tight and are properly lubricated, remove the pitch change
mechanism so that each blade can be checked individually. If the blades are tight, the propeller
should be disassembled.
2. Propeller Blade Inspection and Repair
A. All-Metal Blades
(1) Inspect the blades for damage or cracks. Nicks in the leading edges of the blades should be
filed out and all edges rounded, to prevent formation of cracks. Use fine emery cloth for
finishing.
(2) Refer to Figure 2 for all-metal propeller blade care.
B. Kevlar-Composite Blades
CAUTION: SEE LATEST REVISION HARTZELL MANUAL NO. 135, MAINTENANCE MANUAL
FOR COMPOSITE PROPELLER BLADES, FOR SPECIFIC DAMAGE LIMITS AND
APPROVED REPAIR PROCEDURES. THE FOLLOWING INFORMATION IS
ADVISORY ONLY.
(1) Description.
The composite blade is composed of a metal blade shank retention section into which is
molded a low-density foam core that supports built-up layers of composite laminate. An erosion
shield of electroformed nickel is adhesively bonded to the blade leading edge to protect it from
impact damage. A finish covering of polyurethane paint protects the entire blade from erosion
and ultraviolet damage.