BHT-412-MM-2
5-00-00
Export Classification C, ECCN EAR99
5-27A. EACH 24 MONTHS OF MAIN ROTOR MAST OPERATION
DATA REFERENCES INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: __________________________________________
HELICOPTER S/N: ___________________________________
REGISTRY NO.: _____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:________________________________________
Accomplish every 24 months of main rotor mast
operation when operating in a non-corrosive
environment. If helicopter is operated in a corrosive
environment, it is recommended this inspection be
accomplished every 12 months.
MAIN ROTOR MAST ASSEMBLY (412-040-366-SERIES
AND 412-040-368-SERIES)
Chapter 62 1. Remove main rotor hub assembly.
BHT-412-CR&O
Chapter 63
2. Clean then visually inspect main rotor mast upper splines
for corrosion.
Chapter 62 3. Install main rotor hub assembly.
01 JUN 2018 Rev. 26 Page 150A/150B
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