Textron Bell 412, Maintenance Manual

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BHT-412-MM-2
5-00-00
Page 78
Rev. 16 26 FEB 2013 Export Classification C, ECCN EAR99
WARNING
CAUSE OF ANY DISCOLORATION SHALL BE
DETERMINED AND CORRECTED PRIOR TO
NEXT FLIGHT.
b. Main driveshaft forward and aft couplings, boots, seals
(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 any yellow
bordered TEMP-PLATE, from white/off-white to black, will
indicate a possible overheat condition and /or component
degradation (step c). If one or more of the red bordered
TEMP-PLATE dots change from white/off-white to black, an
overheat condition is present and may require replacement of
both outer and inner couplings.
c. Overheat TEMP-PLATES for condition and security.
TEMP-PLATES must not show evidence of overtemperature
indication, deterioration, debonding, or excessive discoloration
of the epoxy overcoating.
SCHEDULED INSPECTIONS
5-9. 25 HOUR/30 DAY INSPECTION — PART B (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER