Hartzell HC-D2MV20-3 Series, Owner'S Manual And Logbook

Page: 189 / 204

Maintenance Practices
61-00-40
Page 6-11
Rev. 2 Jun/12
Propeller Owner's Manual
140
3. Blade Repairs
CAUTION: INSTRUCTIONS AND PROCEDURES IN
THIS SECTION MAY INVOLVE PROPELLER
CRITICAL PARTS. REFER TO THE
INTRODUCTION CHAPTER OF THIS
MANUAL FOR INFORMATION ABOUT
PROPELLER CRITICAL PARTS. REFER TO
THE ILLUSTRATED PARTS LIST CHAPTER
OF THE APPLICABLE OVERHAUL MANUAL(S)
FOR THE IDENTIFICATION OF SPECIFIC
PROPELLER CRITICAL PARTS.
Nicks, gouges, and scratches on blade surfaces or on the leading
or trailing edges of the blade that are greater than 0.31 inch
(0.79 mm) wide or deep must be removed before flight. Field
repair of small nicks and scratches may be performed by qualified
personnel in accordance with FAA Advisory Circular 43.13-1B, as
well as the procedures specified below. Normal blade lead edge
erosion (sand-blasted appearance) is acceptable, and does not
require removal before further flight.
A. Repair of Nicks or Gouges
(1) Make local repairs using files, electrical or air powered
equipment. Use emery cloth, scotch brite, and crocus
cloth for final finishing. Refer to Figure 6-4.
CAUTION 1: REWORK THAT INVOLVES COLD
WORKING THE METAL, RESULTING
IN CONCEALMENT OF A DAMAGED
AREA, IS NOT ACCEPTABLE. A STRESS
CONCENTRATION MAY EXIST, WHICH
CAN RESULT IN A BLADE FAILURE.