Propeller Owner’s Manual
139
MAINTENANCE PRACTICES
61-00-39
Page 6-12
Rev. 17 Apr/20
3. Beta Feedback Block Assemblies
(Rev. 1)
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.
A. Inspection
(1) The clearance between the yoke pin and the
corresponding linkage (beta lever bushing) can become
too close due to a buildup of plating and foreign particles
between the two pieces. This can cause a binding action,
resulting in excessive wear to the carbon block unit, low
stop collar, beta ring, and/or beta linkage.
(2) Inspect the beta lever and beta feedback block assembly
interface for free movement. If there is binding, do the
following:
(a) Disconnect the beta linkage and remove the beta
feedback block assemblies from the beta ring.
(b) Using an abrasive pad, lightly polish the yoke pin to
provide adequate clearance and eliminate binding.
(c) Reinstall the beta feedback block assembly into the
beta ring.
(d) Install, adjust, and safety the beta linkage in
accordance with the airframe manufacturer's
instructions.
