BHT-412-MM-2
5-00-00
15 DEC 2015 Rev. 23 Page 69
Export Classification C, ECCN EAR99
Chapter 65 8. Tail rotor driveshaft:
CAUSE OF ANY DISCOLORATION SHALL BE
DETERMINED AND CORRECTED PRIOR TO
NEXT FLIGHT.
a. Hanger assemblies — bearings and surrounding areas
for evidence of grease leakage, condition, damage, security,
corrosion, and overheating. Discoloration of bearing (blue to
blue/black in color) or multi-color appearance of hanger that
darkens adjacent to bearing is evidence of overheating. Brown
color of bearing shield is normal and is not evidence of
overheating.
b. Driveshaft sections for cracks, rivet failure, distortion,
dents, corrosion, and for damage to anodized finish.
c. Disc pack couplings for separation, deflection,
distortion, cracks, or missing sections, and correct installation
of bolts and washers.
CAUSE OF ANY DISCOLORATION SHALL BE
DETERMINED AND CORRECTED PRIOR TO
NEXT FLIGHT.
d. Coupling assembly at first hanger and adjacent to
transmission and surrounding area for grease leakage,
damage, corrosion, and evidence of overheat as indicated by
TEMP-PLATES or coupling discoloration. A change in color of
one or more of the red bordered TEMP-PLATE dots from
white/off-white to black indicates an overheat condition and
may require replacement of both outer and inner couplings
(step e).
5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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