Propeller Owner’s Manual
139
MAINTENANCE PRACTICES
61-00-39
Page 6-15
Rev. 17 Apr/20
4. Aluminum Blades
(Rev. 2)
WARNING:
ALL NICKS, GOUGES, OR SCRATCHES OF
ANY SIZE CAN CREATE A STRESS RISER
THAT COULD POTENTIALLY LEAD TO BLADE
CRACKING. ALL DAMAGE SHOULD BE
VISUALLY EXAMINED CAREFULLY BEFORE
FLIGHT FOR THE PRESENCE OF CRACKS OR
OTHER ABNORMALITIES.
CAUTION 1: BLADES THAT HAVE BEEN PREVIOUSLY
REPAIRED OR OVERHAULED MAY HAVE
BEEN DIMENSIONALLY REDUCED. BEFORE
REPAIRING SIGNIFICANT DAMAGE OR
MAKING REPAIRS ON BLADES THAT ARE
APPROACHING SERVICEABLE LIMITS,
CONTACT A CERTIFIED PROPELLER REPAIR
STATION WITH THE APPROPRIATE RATING
OR THE HARTZELL PRODUCT SUPPORT
DEPARTMENT FOR BLADE DIMENSIONAL
LIMITS.
CAUTION 2: 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.
A. Important Information
(1) Nicks, gouges, and scratches on blade surfaces or on
the leading or trailing edges of the blade, that are greater
than 0.031 inch (0.79 mm) wide or deep, must be
removed before flight.
(2) Field repair of small nicks and scratches may be
performed by qualified personnel in accordance with
FAA Advisory Circular 43.13-1B, and the procedures
specified
in this section.
