BHT-412-MM-2
5-00-00
01 JUN 2018 Rev. 26 Page 21
Export Classification C, ECCN EAR99
Chapter 65 INTERMEDIATE GEARBOX
Step 1 through step 4 pertain to helicopters S/N
33001 through 33213 and 36001 through 36019 not
modified by 412-570-001-103 or Pre BHT-412-SI-74
(412SP to 412HP Upgrade).
1. Gearbox assembly for security, condition, corrosion,
damage, and oil leaking.
CAUSE OF ANY DISCOLORATION SHALL BE
DETERMINED AND CORRECTED PRIOR TO
NEXT FLIGHT.
2. Input and output quill flexible couplings (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 over temperature
indication, deterioration, debonding, or excessive discoloration
of the epoxy overcoating.
4. Gearbox for proper oil level and oil for evidence of
contamination.
Step 5 through step 8 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).
5-5. DAILY INSPECTION — PART A (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
To Next Page
Loading...