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This document transmits the Initial Issue of Service Bulletin RB211-72-AL191 Bulletin Initial Issue Remove Incorporate Reason for change Pages 1 to 74 of the Service Bulletin Initial Issue P.O. Box 31, Derby DE24 8BJ, UK Tel: +44 (0) 1332 242424 This Rolls-Royce Technical Publication is subject to export control as follows:
Jurisdiction: UK Export Classification: PL9009c The technical information contained in this document has been approved under the authority of - See Planning Information, Approval.
Date: May 30, 2025 RB211 TRENT 700 SERIES PROPULSION SYSTEMS NON-MODIFICATION SERVICE BULLETIN ALERT RB211−72−AL191 Transmittal - Page 1 of 4
CHECK THAT ALL PREVIOUS TRANSMITTALS HAVE BEEN INCORPORATED If any have not been received please advise customersupport@rolls-royce.com.
© 2025 Rolls-Royce plc
P U B L I C A T I O N T R A N S M I T T A L ALERT
LIST OF EFFECTIVE PAGES The effective pages to this Service Bulletin are as follows:
Page Revision Number Revision Date Bulletin 1 May 30/2025 2 May 30/2025 3 May 30/2025 4 May 30/2025 5 May 30/2025 6 May 30/2025 7 May 30/2025 8 May 30/2025 9 May 30/2025 10 May 30/2025 11 May 30/2025 12 May 30/2025 13 May 30/2025 14 May 30/2025 15 May 30/2025 16 May 30/2025 17 May 30/2025 18 May 30/2025 19 May 30/2025 20 May 30/2025 21 May 30/2025 22 May 30/2025 23 May 30/2025 24 May 30/2025 25 May 30/2025 26 May 30/2025 27 May 30/2025 28 May 30/2025 29 May 30/2025 30 May 30/2025 31 May 30/2025 32 May 30/2025 33 May 30/2025 34 May 30/2025 35 May 30/2025 36 May 30/2025 37 May 30/2025 38 May 30/2025 39 May 30/2025 40 May 30/2025 41 May 30/2025 42 May 30/2025 43 May 30/2025 44 May 30/2025 45 May 30/2025 ALERT RB211−72−AL191 Transmittal - Page 2 of 4
46 May 30/2025 47 May 30/2025 48 May 30/2025 49 May 30/2025 50 May 30/2025 51 May 30/2025 52 May 30/2025 53 May 30/2025 54 May 30/2025 55 May 30/2025 56 May 30/2025 57 May 30/2025 58 May 30/2025 59 May 30/2025 60 May 30/2025 61 May 30/2025 62 May 30/2025 63 May 30/2025 64 May 30/2025 65 May 30/2025 66 May 30/2025 67 May 30/2025 68 May 30/2025 69 May 30/2025 70 May 30/2025 71 May 30/2025 72 May 30/2025 73 May 30/2025 74 May 30/2025 ALERT RB211−72−AL191 Transmittal - Page 3 of 4
ALERT RB211−72−AL191 Transmittal - Page 4 of 4 page left blank intentionally
ENGINE - LP COMPRESSOR - INSPECTION OF LP COMPRESSOR BLADES - NON-MODIFICATION SERVICE BULLETIN - NON - MOD.72-AL191
1. Planning Information A. Effectivity Airbus A330 RB211 TRENT 768-60, TRENT 768-60/15, TRENT 768-60/16 Engines RB211 TRENT 772-60, TRENT 772-60/15, TRENT 772-60/16 Engines RB211 TRENT 772B-60, TRENT 772B-60/15, TRENT 772B-60/16 Engines RB211 TRENT 772C-60, TRENT 772C-60/15, TRENT 772C-60/16 Engines.
B. Reason
(1) Problem Following in-service Low Pressure (LP) compressor (fan) blade release events it is recommended that an in-service inspection (ultrasonic) is undertaken to mitigate against release events. If an ultrasonic inspection is missed, improperly performed, or performed with incorrectly maintained equipment; the effectiveness of the inspection will be reduced and less likely to detect sub-surface anomalies that have the potential to propagate and result in the release of LP compressor blade material.
The ultrasonic inspection is capable of detecting sub-surface anomalies in the LP compressor blade aerofoil. This inspection is available for Trent 700 LP compressor blades at shop visit but the intervals between shop visits are too large to only use shop visit opportunities therefore on-going in-service repeat inspections are required.
(2) Safety Intent The safety intent of this SB is to detect LP compressor blade sub-surface anomalies, prior to the anomalies developing into larger defects that could affect the integrity of the LP compressor blade.
C. Description
(1) This Non-Modification Service Bulletin (NMSB) is issued to instruct an ultrasonic inspection of LP compressor blades aerofoil.
Accomplishment of this NMSB must be recorded against the individual blades and compliance, blades serial numbers and associated blade lives (Time Since New (TSN)/ Cycles Since New (CSN)) logged with your assigned Rolls-Royce Airline Support Team using the proforma in Appendix 2 or 9 as applicable.
(2) The accomplishment instructions for ultrasonic inspection of LP compressor blades is dependent on where the inspection is undertaken as follows:
(
a) Accomplishment instructions for removal and installation of LP compressor blades from an engine on-wing or spare engine for inspection in accordance with Section 3.D., refer to Section 3.B.
(b) Accomplishment instructions for C-Scan inspection of LP compressor blades, removed from an engine in-shop, refer to Section 3.C.
ALERT RB211−72−AL191 Page 1 of 74 May 30/2025, Initial Issue © 2025 Rolls-Royce plc
(c) Accomplishment instructions for phased array (water-coupled procedure) inspection of LP compressor blades, removed from an engine on-wing or spare engine, refer to Section
3.D.
NOTE: Section 3.B. is only applicable if blades are to be inspected in accordance with Section 3.D. For Section 3.C., blades are removed and installed in accordance with Engine Manual procedures.
D. Compliance ALERT This Non-Modification Service Bulletin is anticipated to be the subject of an EASA/FAA Airworthiness Directive.
(1) LP compressor blade inspection shall be performed in accordance with Section 3.C. or 3.D. of this Non-Modification Service Bulletin in the below defined timescales for the identified LP compressor blades. The LP compressor blade life and life since C-Scan are as on Jul. 1/2025.
The inspections are required to be accomplished within the defined dates or cycles from Jul.
1/2025:
Criteria Inspection
(a) All LP compressor blades listed in Appendix 1 Do an inspection in 400 cycles or before Dec. 31/2025 or no later than 1,200 cycles since last inspection, whichever is sooner
(b) On all LP compressor blade standards with a life since last C-scan inspection is greater than 6,000 cycles Do an inspection in 400 cycles or before Dec. 31/2025 or no later than 1,200 cycles since last inspection, whichever is sooner
(c) On all LP compressor blade standards not inspected with C-scan and life since new is greater than 6,000 cycles Do an inspection in 400 cycles or before Dec. 31/2025 or no later than 1,200 cycles since last inspection, whichever is sooner
(d) On all LP compressor blade standards with a life since last C-scan inspection is between 2,400 and 6,000 cycles Do an inspection in 800 cycles or before Jun. 30/2026 or no later than 1,200 cycles since last inspection, whichever is sooner
(e) On all LP compressor blade standards not inspected with C-scan and life since new is between 2,400 and 6,000 cycles Do an inspection in 800 cycles or before Jun. 30/2026 or no later than 1,200 cycles since last inspection, whichever is sooner
(f) On all LP compressor blade standards with a life since last C-scan inspection is less than 2,400 cycles Do an inspection within 1,200 cycles since last inspection
(g) On all LP compressor blade standards not inspected with C-scan and life since new is less than 2,400 cycles Do an inspection within 1,200 cycles since last inspection ALERT RB211−72−AL191 Page 2 of 74 May 30/2025, Initial Issue © 2025 Rolls-Royce plc
Criteria Inspection
(h) LP compressor blades that are not in service and have no flights flown since Jul. 1/2025, due to which the inspections defined in criteria 1.D.(1)(a) to 1.D.(1)(e) cannot be complied with Do an inspection within 50 cycles from the LP compressor blade first return to service
(2) For operators who conduct Standard Operations (as defined in Time Limits Manual (TLM) Task 05-00-01) This NMSB should be accomplished on all LP compressor blades to part numbers FW23643, FW23741, FW23744, KH23403, KH23404 or LV11570 and is in two parts as follows:
(
a) Part 1 - Initial Inspection [1] Do an inspection as defined in 1.D.(1).
NOTE: Last inspections were in accordance with the Accomplishment Instructions of NMSB 72-G702 or NMSB 72-G872 or NMSB 72-H311 or NMSB 72-AH465 or EM Task 72-31-11 or Aircraft Maintenance Manual (AMM) Task 72-31-41.
(
b) Part 2 - Repeat Inspection [1] Re-inspect at an interval that does not exceed 1,200 cycles since last inspection in accordance with this NMSB.
NOTE: Last inspections were in accordance with the Accomplishment Instructions of NMSB 72-AL191.
(3) For operators who conduct Non-Standard Operations (as defined in TLM Task 05-00-01).
This NMSB should be accomplished on all LP compressor blades to part numbers FK23411, FW23643, FW23741, FW23744, KH23403, KH23404 or LV11570 and is in two parts as follows:
(
a) Part 1 - Initial Inspection [1] Do an inspection as defined in 1.D.(1) in accordance with the standard duty cycles.
For operators who conduct Non-Standard Operations (as defined in TLM Task 05-00-01), the cycles referred to in this NMSB are standard duty cycles. The standard duty cycles consumed are calculated by multiplying the number of flights flown by the applicable beta factors. Please refer to TLM Task 05-20-02 for the beta factors.
In the absence of beta factors in the TLM, please contact Rolls-Royce through your assigned Airline Support Team.
NOTE: For every ’missed approach/go-around’ or a ’Touch and Go’ performed, additional standard duty cycles are to be added to the LP compressor blade inspection interval cycle count, as defined in TLM Task 05-00-01.
NOTE: The additional standard duty cycles added for every ’missed approach/go-around’ or a ’Touch and Go’ do not need to be multiplied by the beta factor.
NOTE: Last inspections were in accordance with the Accomplishment Instructions of NMSB 72-G702 or NMSB 72-G872 or NMSB 72-H311 or NMSB ALERT RB211−72−AL191 Page 3 of 74 May 30/2025, Initial Issue © 2025 Rolls-Royce plc
72-AH465 or EM Task 72-31-11 or AMM Task 72-31-41.
(
b) Part 2 - Repeat Inspection [1] Re-inspect at an interval that does not exceed 1,200 cycles since last inspection in accordance with this NMSB. For operators who conduct Non-Standard Operations (as defined in TLM Task 05-00-01), the cycles referred to in this NMSB are standard duty cycles. The standard duty cycles are calculated by multiplying the number of flights flown by the applicable beta factors. Please refer to TLM Task 05-20-02 for the beta factors.
In the absence of beta factors in the TLM, please contact Rolls-Royce through your assigned Airline Support Team.
NOTE: For every ’missed approach/go-around’ or a ’Touch and Go’ performed, additional standard duty cycles are to be added to the LP compressor blade inspection interval cycle count, as defined in TLM Task 05-00-01.
NOTE: The additional standard duty cycles added for every ’missed approach/go-around’ or a ’Touch and Go’ do not need to be multiplied by the beta factor.
NOTE: Last inspections were in accordance with the Accomplishment Instructions of NMSB 72-AL191.
E. Approval NMSB 72-AL191 was approved by Rolls-Royce on May 30/2025. The technical content of this document is approved under the authority of the DOA ref. EASA.21J.065.
F. Manpower In service
(1) Time to remove LP compressor blades:
3 hours per LP compressor blade set (2 persons)
(2) Time to inspect LP compressor blades:
(
a) Ultrasonic phased array water-coupled inspection - 6 hours per LP compressor blade set (1 person) [1] The ultrasonic inspection defined in this procedure must be performed by personnel certified to ultrasonic inspection Level 2 in accordance with EN4179/NAS410 or alternative standards/guidelines accepted by the applicable National Aviation Authority. All personnel utilising this technique must have received technique-specific training either directly from the Rolls-Royce NDE Laboratory Derby or from Rolls-Royce approved trainers.
[2] For inspections performed on behalf of Rolls-Royce, ultrasonic inspectors must be certified to ultrasonic inspection Level 2 in accordance with EN4179/NAS410 and hold a valid Rolls-Royce Authorisation Form for this technique.
[3] If an inspector has not performed one complete LP compressor blade set inspection within three months, the inspector must watch the latest inspection video (DV231567) prior to performing in-service inspections.
ALERT RB211−72−AL191 Page 4 of 74 May 30/2025, Initial Issue © 2025 Rolls-Royce plc
[4] If an inspector has not performed one complete LP compressor blade set inspection within six months, the inspector must watch the inspection video (DV231567) and be re-assessed by a UT Level 3 who is familiar with the phased array inspection technique, prior to performing in-service inspections. Re-assessment must be performed using an LP compressor training blade that contains known EDM notches (RRT116163 or RRT131971 as applicable). The inspector must follow the procedure correctly and must successfully identify all known EDM notches without false calls.
[5] All personnel carrying out this inspection must watch the inspection video (DV231567) and be re-assessed every twelve months by a UT Level 3 who is familiar with the phased array inspection technique. Re-assessment must be performed using an LP compressor training blade that contains known EDM notches (RRT116163 or RRT131971 as applicable). The inspector must follow the procedure correctly and must successfully identify all known EDM notches without false calls.
Record of annual re-assessment must be kept.
[6] If an Inspector has not performed one complete LP compressor blade set inspection within twelve months, the inspector must receive specific training and approval either directly by the Rolls-Royce NDE Laboratory Derby or from Rolls-Royce approved trainers, prior to performing in-service inspections.
NOTE: For training refresher purposes the inspection video DV231567 is accessible at the following location. Continue to use inspection video DV231567 for refresher training purposes only until a new video is made available, which will include the procedure detailed in this NMSB.
http://content.imageresourcemedia.com/preview/irstream/2/231567_Trent_700_ Ultrasonic_Phased_Array_Fan_Blade_Inspection.mp4?autoPlay=1 The video should be used for guidance only. The inspection must be carried out as written in this NMSB.
(3) LP compressor blade re-lubrication 3 hours elapsed time (2 persons)
(4) Time to install LP compressor blades:
3 hours per LP compressor blade set (2 persons) NOTE: A vibration ground run will be required.
In shop:
(1) Time to inspect LP compressor blades:
(
a) C-Scan inspection - 28 hours per LP compressor blade set (1 person) NOTE: The C-scan ultrasonic inspection defined in 3.C. Accomplishment Instructions shall only be performed by personnel who have received specific training either directly by Rolls-Royce or from personnel trained by an approved Rolls-Royce supplier. Training records are to be retained and kept up to date according to both local and any Rolls-Royce policies.
G. Material Price and Availability None.
ALERT RB211−72−AL191 Page 5 of 74 May 30/2025, Initial Issue © 2025 Rolls-Royce plc
H. Tooling Price and Availability
(1) Tooling for LP compressor blade inspection:
Tool No. Description Qty RRT115160 Phased array inspection kit (water-coupled system) 1 off NOTE: RRT115160 must be modified in accordance with Appendix 4 of this NMSB prior to commencement of the inspection.
(2) Consumable Materials:
None.
(3) Tooling for refresher purposes:
Tool No. Description Qty Ultrasonic Phased Array Water-coupled Inspection RRT116163 EDM notched LP compressor blade, used with RRT115161 Detail 1 index arm only 1 off RRT131971 EDM notched LP compressor blade, used with RRT131829 Detail 1 index arm 1 off Please contact your assigned Rolls-Royce Airline Support Team for price and availability.
I. References
(1) Aircraft Maintenance Manual (AMM):
(
a) Task 72-31-41, Removal/Installation of LP Compressor Blades and Dampers
(b) Task 72-31-41, LP Compressor Rotor Blade - Re-apply the Dry Film Lubricant (FRSA031)
(c) Task 72-31-41, Water-Coupled Phased Array Ultrasonic Inspection of the LP Compressor Blades (Removed From an Engine)
(d) Task 72-31-51, LP Compressor Disc - Re-apply the Dry Film Lubricant (FRSA017)
(2) Engine Manual (EM):
(a) Task 72-00-00, Special Procedures, Procedure to Rework LP Compressor Blade Convex and Concave Aerofoil Surfaces following Water Coupled Phased Array Indication
(b) Task 72-31-11, C-Scan Inspection of the Low Pressure (LP) Compressor Blades for Sub-Surface Cracks
(3) Overhaul Process (OP) Manual:
Task 70-00-00, Overhaul Process 237 - C-Scan General Requirements, Investigation of Rejected Blades and Maintenance of Equipment ALERT RB211−72−AL191 Page 6 of 74 May 30/2025, Initial Issue © 2025 Rolls-Royce plc
(4) Rolls-Royce Non-Modification Service Bulletins:
(
a) 72-AH465 Engine - LP Compressor - Inspection of LP Compressor Blades - Non-Modification Service Bulletin
(b) 72-G872 Engine - LP Compressor - Inspection of LP Compressor Blades - Non-Modification Service Bulletin
(c) 72-H311 Engine - LP Compressor - Inspection of LP Compressor Blades - Non-Modification Service Bulletin
(d) 72-G702 Engine - LP Compressor - Inspection of LP Compressor Blades - Non-Modification Service Bulletin
(5) Time Limits Manual (TLM):
(a) Task 05-00-01, Recording and Control of the Lives of Parts
(b) Task 05-20-02, Group B Parts Mandatory Inspections
(6) Ultrasonic Phased Array Water-Coupled Inspection Video:
NOTE: For training refresher purposes the inspection video DV231567 accessible at the following location can be used until new video becomes available. The video should be used for guidance only. The instructions must be carried out as written in this NMSB.
DV231567 http://content.imageresourcemedia.com/preview/irstream/2/231567_Trent_700_ Ultrasonic_Phased_Array_Fan_Blade_Inspection.mp4?autoPlay=1 ALERT RB211−72−AL191 Page 7 of 74 May 30/2025, Initial Issue © 2025 Rolls-Royce plc
2. Material Information None.
ALERT RB211−72−AL191 Page 8 of 74 May 30/2025, Initial Issue © 2025 Rolls-Royce plc