BHT-412-MM-2
5-00-00
Page 160 Rev. 16 26 FEB 2013
Export Classification C, ECCN EAR99
INDEXING FLATS OF 0.015 INCH (0.381 MM)
(TWO PLACES 180° APART) ON DISC
ASSEMBLIES ARE PREFERENTIALLY ORIENTED
AND SHOULD NOT BE DISTURBED IN HANDLING.
IF ORIENTATION IS INADVERTENTLY
DISTURBED, REINDEX DISCS BY ALTERNATING
INDEX FLATS ON EACH DISC 60
° FROM
ADJACENT DISC.
Chapter 65 3. Remove driveshafts from helicopter.
4. Visually examine driveshafts for nicks and dents. Examine
flange mating surfaces and pilot diameters for evidence of
fretting, wear, and/or corrosion.
5. Visually examine coupling 412-340-610 laminations for
evidence of wear and or corrosion.
6. After intermediate gearbox, tail rotor gearbox, and hanger
assemblies have been inspected, install tail rotor driveshafts.
INTERMEDIATE GEARBOX
Chapter 65
BHT-412-CR&O
1. Visually inspect exterior surfaces of intermediate gearbox
for evidence of seeping, leaking, corrosion, and/or damage.
BHT-412-CR&O 2. Inspect output quill assembly as follows:
Chapter 65
CAUSE OF ANY DISCOLORATION SHALL BE
DETERMINED AND CORRECTED PRIOR TO
NEXT FLIGHT.
5-31. EACH 2500 HOURS OF TAIL ROTOR DRIVE SYSTEM OPERATION (CONT)
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
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