TM 1-1520-238-23
5-219
5.48.
MAIN ROTOR ELECTRICAL BRUSH, ELECTRICAL HOLDER, AND PITCH WEB ELECTRICAL
LEAD REMOVAL/INSTALLATION – continued
5.48.4. Cleaning
a. Wipe removed and attaching parts with a clean rag.
5.48.5. Inspection
a. Check retainer and electrical holder for cracks. None allowed.
b. Check retainer and electrical holder for corrosion (para 1.49).
c. If spring is broken or if brush is less than 1/8 INCH long, replace brush and spring.
d. Check leads for loose terminals, damaged insulation, or broken wires. None allowed.
e. Check gap between brush block holder and liner for greater than 0.030 INCH gap.
(1) If gap is less than 0.030 INCH, remove material from brush holder for clearance. Minimum brush holder
wall thickness is 0.020 INCH.
f. Check brush wear pattern.
(1) Wear pattern should be between 0.175 INCH (both brushes alined) and 0.278 INCH (maximum spread of
brushes and full brush contact).
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