BHT-412-MM-2
5-00-00
Page 120 Rev. 20 2 SEP 2014
Export Classification C, ECCN EAR99
3. Carry out a further detailed visual inspection, with a 10X
magnifying glass, of the shaded area shown in Figure 5-3,
between stations 20.00 and 35.00 of both sides of the blade,
with a bright light.
4. If any blistering, peeling, flaking, bubbling, or cracked
paint is detected, remove the paint from the affected area by
sanding in a spanwise direction only, with an abrasive cloth or
paper (C-406) 240 grit or finer, and a final sanding with an
abrasive cloth or paper (C-406) 400 grit or finer. After paint
removal, visually inspect the affected area for damage with a
10X magnifying glass. Damage beyond the limits in Chapter 64
requires the blade be removed from service.
5. Only superficial corrosion that can be removed with
aluminum wool or very fine grade abrasive pad (C-407) is
permissible. Corrosion on the spar 0.003 inch deep or less is
acceptable when polished out. Replace any blade that has
corrosion on the spar greater than 0.003 inch.
6. If a nick, scratch, or dent is found, visually inspect for
crack using a 10X magnifying glass, or higher, and measure
the depth of the damage. (A digital optical micrometer is one
tool that can be used for this measurement.)
7. Repair damage and/or corrosion found on tail rotor blades
in accordance with Chapter 64.
8. Replace any blade that has a crack. No cracks are
permitted.
9. If paint was removed during the previous steps, carry out
paint touch-up/refinishing.
5-18. EACH 25 HOURS OF TAIL ROTOR OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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