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RB 211 Maintenance Scope
B-10
− MOD 1231 – Revised HP Speed Probes
Compressor Intermediate Case (Sections 1661/1661A)
• Detail Strip, Clean and Inspect.
• Re-protect the Compressor Intermediate Case.
• Replace Thread Inserts on the Starter Mounting Flange, Borescope Ports and BOV Mounting
Flange.
It is recommended that the Outlet Guide Vane Ring (OGV) be modified up to the latest
applicable MOD standard i.e. 1249 (1190)
NOTE: Lower standards of OGV ring can only be upgraded to MOD 1190. MOD 1249 is
incorporated through replacement only. Again customer should be advised/and agree to
what MODs can be incorporated.
HP and IP Compressor Location Bearings (Section 1668)
• Detail Strip, Clean and Inspect.
• Replace the HP Thrust Bearing (MOD 1183 Standard) and IP Thrust Bearing (MOD 899
Standard).
• Crack Test the following components:
− Rear Stub Shaft
− Sleeve Inner IP Bearing
− Sleeve Locking
− Coupling IP Shaft
• Dynamic Balance the Rear Stub Shaft during build.
• Rebuild all sub assemblies then rebuild 03 as per standard procedure.
04 Module:
Attachment Fittings HP Turbine Rotor (Section 1069)
• Detail Strip, Clean and Inspect.
Turbine Rotor Discs and Shaft HP (Sections 1071 – 1071/A)
[If required – carry out a “porcupine check” before strip as per RN5024]
• Detail Strip, Clean and Inspect.
• Embody the following:
− RN 5016 – Engine Components Life Limitation Data