CSP−900RMM−2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 236
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 121 to 125% (Cont.)
900 Replace main rotor drive shaft if not PN 900D2436530−101. 63−10−00
900 Examine main rotor drive shaft PN 900D2436530−101 63−10−00
900 Replace main rotor drive plate fasteners. 63−10−00
900 Examine transmission acoustic isolators for condition. 63−20−00
900 Examine transmission fasteners. Make sure the torque is correct. 63−20−00
900 Examine input drive shaft assemblies and fasteners for condition and
looseness. Make sure the torque is correct.
63−10−00
Averaged Input 126 to 135%
900 Record time above transmission input exceedance threshold value as
given 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 plate cover and fasteners
Main rotor drive shaft
Transmission assembly
All eight segmented acoustic isolators
63−10−00
900 Replace main rotor drive shaft if not PN 900D2436530−101. 63−10−00
900 Examine main rotor drive shaft PN 900D2436530−101. 63−10−00
900 Replace hardware that attaches main rotor drive plate. 63−10−00
900 Magnetic particle examine main rotor drive plate for cracks or related
damage. If found replace:
Main rotor drive plate
Main rotor drive plate cover and fasteners
Transmission assembly
All eight segmented acoustic isolators
Hardware that attaches transmission
CSP−SPM
900 Replace transmission bolt acoustic isolators and transmission
fasteners.
63−20−00
900 Examine segmented acoustic isolators for condition. 63−20−00
900 Examine input drive shaft assemblies and fasteners for condition and
looseness. Make sure the torque is correct.
63−10−00
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