CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 237
Revision 34
05-50-00
Table 208. Transmission and Drive System Overtorque (900 CONFIG), Conditional Inspection.
Both Engines Operative, 8% Maximum Engine Torque Differential (Cont.)
Registration No. Serial No. Helicopter Total Hours
Model Initial
Ref. RMM
Section
Requirement
Averaged Input 126 to 135% (Cont.)
900 Examine anti−torque fan coupling for condition and installation. 63−10−00
900 Examine transmission anti−torque output coupling for condition and
installation.
63−20−00
900 Examine input drive shaft assemblies and fasteners for condition and
installation. Make sure the torque is correct.
63−10−00
Averaged Input 136 to 140%
900 Log time above transmission input exceedance threshold value as
provided by the IIDS in the Rotorcraft Log Book (T1 value).
N/A
900 Replace transmission bolt acoustic isolators and transmission
fasteners.
63−20−00
900 Examine main rotor drive shaft and drive plate spline teeth for
cracked or broken spline teeth. If found replace transmission
assembly and all eight segmented acoustic isolators.
63−10−00
900 Replace main rotor drive shaft, drive plate, drive plate cover, and
related fasteners.
63−10−00
900 Remove and examine anti−torque fan drive shaft, do not disassemble
drive shaft assembly:
Examine coupling to shaft interface for damage or cracking.
Examine fastener holes for corrosion, elongation, and fretting.
Replace if a discrepancy is found.
63−10−00
900 Examine segmented acoustic isolators for condition. 63−20−00
900 Examine transmission anti−torque output pinion flange and
anti−torque fan input flange for corrosion, hole elongation, and
fretting. Replace if a discrepancy is found.
64−30−00
900 Replace all anti−torque drive shaft fasteners. 63−10−00
900 If not replaced by single engine torque value, examine input drive
shaft assemblies and fasteners for condition and installation. Make
sure the torque is correct.
63−10−00
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