Textron Bell 212, Maintenance Manual

Page: 150 / 269

BHT-212-MM-1
5-00-00
Export Classification C, ECCN EAR99
9. 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 using an abrasive
cloth or paper (C-406) 400-grit or finer. After paint removal,
visually inspect the affected area for damage using a 10X
magnifying glass. Damage beyond the limits given in Chapter
64 requires blade removal from service.
10. 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.
11. 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).
12. Repair damage and/or corrosion found on tail rotor blades
in accordance with Chapter 64.
13. Replace any blade that has a crack. No cracks are
permitted.
14. If paint was removed during the above steps, carry out
paint touch up/refinishing in accordance with Chapter 64.
SPECIAL INSPECTIONS
5-22. EACH 25 HOURS OF FLIGHT OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
15 NOV 2018 Rev. 16 Page 126A