FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 8. Engines, Fuel, Exhaust, and Propellers | 4. Repair of Metal Propellers | 8-74. Repair Limits
9/8/98
AC 43.13-1B
90 percent blade radius point, the blade width
and thickness may be modified as per the
manufacturer’s instructions.
b. Shortening Blades. Shortening pro-
peller blades is a major repair. When the re-
moval or treatment of defects on the tip neces-
sitates shortening a blade, shorten each blade
used with it and keep such sets of blades to-
gether. (See figure 8-26 for acceptable meth-
ods.) Mark the shortened blades to correspond
with the manufacturer’s system of model des-
ignation to indicate propeller diameter. In
making the repair, it is not permissible to re-
duce the propeller diameter below the mini-
mum diameter limit shown on the pertinent
specification or type certificate data sheet.
c. Straighten Propeller Blades. Never
straighten a damaged propeller. Even partial
straightening of blades to permit shipment to a
certificated propeller repair facility may result
in hidden damage not being detected and an
unairworthy propeller being returned to serv-
ice.
8-74. REPAIR LIMITS. The following
limits are those listed in the blade manufac-
turing specification for aluminum-alloy blades
and govern the width and thickness of new
blades. These limits are to be used with the
pertinent blade drawing to determine the
minimum original blade dimensions to which
the reduction of figure 8-27 and figure 8-28.
may be applied. When repairs reduce the
width or thickness of the blade below these
limits, reject the blade. The face alignment or
track of the propeller should fall within the
limits recommended by the manufacturer for
new propellers
FIGURE 8-26. Method of repairing damaged tip of aluminum-alloy propellers.
Par 8-73
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