Textron Bell 412, Maintenance Manual

Page: 55 / 288

BHT-412-MM-2
5-00-00
01 JUN 2018 Rev. 26 Page 23 Export Classification C, ECCN EAR99
WARNING
CAUSE OF ANY DISCOLORATION SHALL BE
DETERMINED AND CORRECTED PRIOR TO
NEXT FLIGHT.
2. Input quill flexible coupling (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 3).
3. 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.
4. Gearbox for proper oil level and oil for evidence of
contamination.
NOTE
Step 5 and step 6 pertain to helicopters S/N 36020
through 36999, S/N 37002 through 37999, S/N
38001 through 38999, S/N 39101 through 39999,
and helicopters modified by 412-570-001-103 or
Post BHT-412-SI-74 (412SP to 412HP Upgrade).
5. Gearbox assembly for security, condition, corrosion,
damage, and oil leaking.
6. Gearbox for proper oil level and oil for evidence of
contamination.
Chapter 67 FLIGHT CONTROLS
1. Inspect flight control tubes for condition, corrosion, and
security.
SCHEDULED INSPECTIONS
5-5. DAILY INSPECTION — PART A (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER