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RB 211 Maintenance Scope
B-2
• Conduct a full internal borescope examination of the engine. Refer to the M/M Volume 1,
Chapter 6. for reference and allowable limits of any nicks, dents or other foreign object
damage found.
• Examine all borescope blanking plugs, which extend into the gas generator, for frettage and
wear. Any major frettage should be investigated and the plug changed.
• Examine the rubber flexible joint seal between the Intake Flare and the engine flange.
• Check the variable inlet guide vane (VIGV) operating mechanism for freedom of movement
and security of linkages. Inspect the VIGV bushes for wear.
• Check the security and condition of the VIGV high and low speed stops.
• Remove and check the Blow Off Valve (BOV) Control Solenoid. Refer to the M/M Vol.1,
Chapter 6 and Service Bulletin # 54.
• On RB 211 – 24’A’ & ‘C’ engines, visually inspect and service the VIGV Master Ram
assembly, as per the M/M Vol.1, Chapter 6, Paragraphs 11 & 12.
• On the Master Ram assembly, remove the P2 air splitter housing and carefully clean the
needle valve and seat. Do not adjust the Ram.
• Remove and clean the HP 3 air filter.
• Remove and check the discharge rate of the Igniter Plugs. Change one or both as required.
• If it is still installed, remove and clean the gas generator mounted lube oil filter. Reference
should be made to Service Bulletin # 55.
• Check the functioning and calibration of the Vibration Monitoring equipment. The M/M
Vol. 1, Chapter 6 details this check. Replace any components as required.
• A DC resistance and insulation test should be carried out on all of the engines electrical
components.
• Check and service the Davis Vent valve. The seal replacement is detailed in Service Bulletin
# 104. Valve connections are detailed in M/M Chapter 2.
• Check the Gas Starter and associated pipework for any evidence of oil leaks.
• Change the Main Lube Oil Skid mounted Filters. Refer to the Maintenance and Parts Manual
Off-Engine Parts, Vol. 1A, Part 1A, Chapter 4.
• On the Mark 2 Console, clean or replace the in line filter to the Pegasus Valve.
• On the Mark 3 Console, clean or replace the in line filter to the MOOG Valve.
• Check the inert gas pressure of the lube oil system accumulator.
• Replace the inlet filter to the fuel valve actuator.
• Perform a function check on the high-speed shut-off cock in the fuel skid.
• It is recommended that a check of all pressure switches, solenoids, heaters, thermostats, and
electrical equipment, mounted off engine, be carried out as per the manufacture’s