BHT-412-MM-2
5-00-00
Export Classification C, ECCN EAR99
9. Visually inspect the segments (3) and the expandable
blade bolt (1) for cracks, fretting, corrosion, or mechanical
damage. Refer to the BHT-412-CR&O, Chapter 62 for damage
limits.
Any bolts with damage beyond the limits of the
BHT-412-CR&O, Chapter 62 must be removed from
service.
Repairable damage of the expandable blade bolt is
limited to blending/polishing with 240-grit abrasive
cloth or paper (C-423) followed by 320 and 400-grit
abrasive cloth or paper (C-423).
Apply solid film lubricant (C-021) to repaired areas
and areas of burnished or missing solid film lubricant.
10. Apply a thin continuous layer of grease (C-561) to the core
pin (5) and the segments (3) both internally and externally on all
surfaces.
11. To begin reassembly, hold the end of the blade bolt
segment removal/installation workaid and bolt handle (2). Invert
the expandable blade bolt assembly to allow segments (3) to
slide freely from the blade bolt segment removal/installation
workaid back onto the core pin (5). Make sure the segments
seat correctly against each other.
12. Remove the blade bolt segment removal/installation
workaid and install the nut (4) on the core pin (5).
Chapter 62 13. Install the main rotor expandable blade bolts (1) in the main
rotor hub assembly.
5-22A. EACH 300 HOURS OR 6 MONTHS OF EXPANDABLE BLADE BOLT OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
01 JUN 2018 Rev. 26 Page 132C
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