Textron Bell 412, Maintenance Manual

Page: 182 / 288

BHT-412-MM-2
5-00-00
Page 136
Rev. 26 01 JUN 2018 Export Classification C, ECCN EAR99
SPECIAL INSPECTIONS
5-24. EACH 600 HOURS OF MAIN DRIVESHAFT OPERATION OR 12 MONTHS
DATA REFERENCE INSPECTION TASK DESCRIPTION
INITIAL
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________ _________________________
HELICOPTER S/N: __________ _________________________
REGISTRY NO.: ____________ _________________________
TOTAL TIME:_______________________________________
SIGNATURE: _______________ _________________________
NOTE
Accomplish each 600 hours of main driveshaft
operation or 12 months, whichever occurs first (no
Non Destructive Inspection (NDI) required.
MAIN DRIVESHAFT 212-040-005-003/-007/-103, AND
412-040-005-101/-103
Chapter 63
BHT-412-CR&O 1. Remove main driveshaft.
NOTE
Only disassemble driveshaft to the extent necessary
to remove old grease and repack.
2. Clean, visually inspect, and repack flexible couplings.
3. Install main driveshaft.
NOTE
Balancing of main driveshaft is required on 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) anytime
driveshaft is removed and reinstalled. Prior serial
number helicopters, balancing of driveshaft is optional.