CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 235
Revision 34
05-50-00
Table 208. Transmission and Drive System Overtorque (900 CONFIG), Conditional Inspection.
Both Engines Operative, 8% Maximum Engine Torque Differential
Registration No. Serial No. Helicopter Total Hours
Model Requirement
Ref. RMM
Section
Initial
Each engine overtorque exceedance shall be evaluated as a single engine overtorque.
The combined engine overtorque shall be evaluated as an average of the two engine overtorques.
CAUTION
NOTE: If IIDS shows time above multiple thresholds, make sure which ones are actual exceedances. If more
than one, record longest one as S1 time in Rotorcraft Log Book.
Single Input 125 to 139%
900 Log time above transmission input exceedance threshold value as
provided by the IIDS in the Rotorcraft Log Book (S1 value).
N/A
Single Input 140 to 150%
900 Log time above transmission input exceedance threshold value as
provided by the IIDS in the Rotorcraft Log Book (S1 value).
N/A
900 Replace all input drive shaft fasteners. 63−10−00
900 Examine transmission input flange for visible damage. If damaged,
replace input pinion.
63−20−00
900 Examine transmission acoustic isolators for condition and installation. 63−20−00
900 Examine transmission fasteners for condition and looseness. Make
sure the torque is correct.
63−20−00
Single Input Above 150%
900 Replace input drive shaft and all fasteners. 63−10−00
900 Replace transmission assembly. 63−20−00
Averaged Input 101 to 120%
900 No action required. N/A
Averaged Input 121 to 125%
900 Log time above transmission input exceedance threshold value as
provided by the IIDS in the Rotorcraft Log Book (T1 value).
N/A
900 Examine main rotor drive shaft and drive plate for cracked or broken
spline teeth. If found replace:
Main rotor drive plate
Main rotor drive shaft
Main rotor drive plate cover and fasteners
Transmission assembly
All eight segmented acoustic isolators
Transmission fasteners
63−10−00
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