P.O. Box 31, DERBY 

DE24 8BJ, UK 

Telephone: 44 (0) 1332 242424 

Fax: 44 (0) 1332 249936 - Rolls-Royce 

PUBLICATION TRANSMITTA 

The technical information contained in this document has been approved under the authority 

of - See Planning Information, Approval. 

Signed 4, Date Apr. 2/09 

N. J. Wright 

RB211-524 AND 535 SERIES PROPULSION SYSTEMS NON-MODIFICATION SERVICE 

BULLETIN 

ALERT u 

2 

(3 This document transmits Revision 2 to Service Bulletin RB211-72-AF572 .- s 

m 

cI Document History .- s 

L 

n Service Bulletin Revision Status Supplement Revision Status 

Initial Issue Oct. 15/07 

Revision 1 Oct .10/08 

Bulletin Revision 2 

Remove 

All pages of the 

Service Bulletin 

Incorporate 

Pages 1 to 10 of the 

Service Bulletin 

ALERT 

Reason for change 

Accomplishment Instructions 

revised to allow 

alternative power source 

for the electrochemical test 

Transmittal - Page 1 of 2 

CHECK THAT ALL PREVIOUS TRANSMITTALS HAVE BEEN INCORPORATED 

If any have not been received please advise Customer Data Services, Rolls-Royce plc, Derby, England 

O Rolls-Royce plc (date as above) Printed in Great Britain 
LIST OF EFFECTIVE PAGES

The effective pages to this Service Bulletin following incorporation of Revision

2 are as follows:

Page Revision Number Revision Date

Bulletin

R 1 2 Apr.2/09

R 2 2 Apr.2/09

R 3 2 Apr.2/09

R 4 2 Apr.2/09

R 5 2 Apr.2/09

R 6 2 Apr.2/09

R 7 2 Apr.2/09

R 8 2 Apr.2/09

R 9 2 Apr.2/09

R 10 2 Apr.2/09

Printed in Great Britain

RB.211−72−AF572

Transmittal - Page 2
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No : 

72-AF572

Revision 2

ISSUED BY THE ENGINEERING CONFIGURATION DEPARTMENT 

 2009 Rolls-Royce plc 

The information in this document is the property of Rolls-Royce plc and may not be copied, or communicated to a third party, or 

used for any purpose other than that for which it is supplied without the express written consent of Rolls-Royce plc.

ENGINE – COMBUSTION LINER – CHECK OF PHASE 2 FRONT COMBUSTION LINER METERING 

PANEL MATERIAL – NON-MODIFICATION SERVICE BULLETIN – NON-MOD.72-AF572 

1. Planning Information

A. Effectivity

(1) Boeing 757 

 All RB211-535C engines. 

 All RB211-535E4 engines except: 535E4-37/25, 535E4-37/39, 535E4-37/43, 535E4-37/44. 

All RB211-535E4-B engines except: 535E4-B-37/25, 535E4-B-37/35, 535E4-B-37/39, 535E4-B37/41. 

(2) Tupolev Tu204 

RB211-535E4-B-75 

 (3) Boeing 747 

RB211-524B2-19, 524C2-19, 524D4-19, 524D4-B-19, 524D4-39: only engines that are post 

SB72-7221. 

All RB211-524G2-19, 524G3-19, 524H2-19 engines. 

 (4) Boeing 767 

All RB211-524H-36 engines. 

 (5) Lockheed L1011 

RB211-524B-02, 524B3-02, 524B4-02: only engines that are post SB72-7221. 

Note: This Non-Modification Service Bulletin (NMSB) inspection is applicable only to RB211-524 and 

RB211–535C/E4/E4-B engines that are installed with Phase 2 combustors that are specified with C263 

material metering panels. This NMSB is not applicable to Phase 5 combustors, hence it is not applicable 

to RB211-535E4/E4-B engines with SB 72-C230 installed, nor is it applicable to RB211-535E4-C 

engines that had a Phase 5 combustor at entry into service, nor is it applicable to RB211-524G/H-T 

engines that are post SB 72-C067. 

 B. Reason

During troubleshooting of a starting problem with an RB211-535E4-B engine, the Fuel Spray Nozzles 

(FSNs) appeared misaligned and the engine was removed. Strip investigation found that the FSNs were 

correctly positioned but that the Front Combustion Liner (FCL) metering panel (EIPC 72-41-13 02-324) 

was cracked and distorted. Laboratory investigation revealed that the FCL metering panel was to an 

incorrect material specification (‘N75’ material, rather than ‘C263’ material), which was determined to 

be the root cause of the FCL metering panel cracking and distortion. 
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No: 

72-AF572

Revision 2

________________________________________________________________________________________ 

 2009 Rolls-Royce plc

SB 72-7221 was issued, in 1984, to address the issue of Phase 2 FCL N75 metering panel cracking in the 

early marks of the RB211-524 engine; it replaced the N75 metering panel with one made from C263. The 

metering panel in Phase 2 combustors of the RB211-524G/H and RB211-535C/E4/E4-B engines was 

specified in C263 material from engine type entry into service. 

The use of N75 metering panels, where C263 was the intended material, has the proven potential to lead 

to metering panel cracking. Significant metering panel cracking could result in a service event. 

This Non-Modification Service Bulletin (NMSB) instructs a check for correct metering panel material at 

engine shop visit, and the withdrawal from service any parts that have been incorrectly manufactured 

from N75 material. 

R Revision 1 of this NMSB was raised to remove the requirement to vibro-engrave the NMSB number onto 

 the Front Combustion Liner after accomplishment and to amend the recording requirements. 

R Revision 2 has been raised to allow the use of alternative power source for carrying out the 

R electrochemical test instructed. Revision 1 specified 2-off 9 volt PP9 batteries connected in series. 

R These batteries are becoming obsolete and difficult to procure; however, any 18 volt battery power supply 

R capable of producing a spark when tested as detailed in section 3.B.7 is acceptable. 

 C. Compliance

 ALERT 

The actions described in Section 3. Accomplishment Instructions of this Non-Modification Service 

Bulletin (NMSB) should be accomplished as detailed below: 

a) Inspect any front combustion liner stock that can be fitted to those engines listed in Section A. 

Effectivity within 6 months of issue of this NMSB. 

b) Inspect engines at current shop visit where the HP Turbine Rotor has been removed from the 

Combustion Outer Casing and has not yet been reinstalled into the Combustion Outer Casing 

on the date of the first issue of this NMSB. 

c) Inspect at the next shop where the HP Turbine Rotor is removed from the Combustion Outer 

Case. 

NOTE: This is a once-only inspection. 

This NMSB can be incorporated without carrying out the Accomplishment Instructions in Section 3 if 

either: 

i. TV75295 has been incorporated, or 

ii. The metering panel (Engine Illustrated Parts Catalogue: 72-41-13-02-324) was 

delivered from Rolls-Royce after 23 April 2007. 

D. Approval

The technical content of this Non-Modification Service Bulletin was approved under the authority of 

R Design Organisation Approval EASA.21J.035 on Oct.15/07 and was re-approved on Oct.7/08 and 

R Apr. 2/09 

 E. Manpower

(1) Overhaul Shop 
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No: 

72-AF572

Revision 2

________________________________________________________________________________________ 

 2009 Rolls-Royce plc

(a) Time to gain access (1 person) 

0.25 hour 

(b) Time to inspect (1 person) 

0.5 hour 

(c) Time to restore to serviceable condition (1 person) 

0.25 hour 

(d) Total Time 

1 hour 

(2) On Wing 

Not Required 

 F. Material Price and Availability

 None 

 G. Tooling Price and Availability

 None 

H. References

 (1) TV75295 - Inspection Of Front Combustion Liner (FCL) Meterpanel Material 

(2) Engine Illustrated Parts Catalogue (EIPC), 72-41-13-02-324 Metering Panel Assembly 

(3) Rolls-Royce RB211 Service Bulletins: 

 72-7221 Engine – Combustion Section - Front Combustion Liner - Flexible Mounting (Hairpin 

 Section) and Improved Cooling 

 72-C067 Engine - Module 4 - Introduction of Revised HP System 

 72-C230 Engine - Module 4 - Introduction of Revised HP System Incorporating an Improved 

 Combustor 

(4) OP TASK 70-00-00-300-363 (Overhaul Process 363 - Marking Methods), Overhaul Processes 

Manual 
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No: 

72-AF572

Revision 2

________________________________________________________________________________________ 

 2009 Rolls-Royce plc

2. Material Information

Chemical reagents: 

 5% sodium fluoride aqueous solution (50ml) – OMat 1/102 

5% Potassium Thiocyanate in Acetone (50ml) – OMat 1/113 

R 18 volt power supply. Any form of battery power may be used provided that it is able to produce a spark 

R when configured in accordance with this NMSB and tested in accordance with section 3.B.7. An 18 volt, 

R 2.4 Amp battery power source is ideal. 

 2m of insulated copper wires (e.g. 1.5mm gauge) 

 Filter paper (e.g. Whatman no. 2) – OMat 1/144 

 Crocodile clip (positive test electrode – “anode”) 

Commercially pure cylindrical (approx 5mm dia) aluminium or titanium rod (negative test electrode – 

“cathode”) with PVC or rubber tubing insulating sleeve. 

 Abrasive grit paper: 

 SiC – OMat 5/37 or 

 Emery paper – OMat 5/44 or 

 Aluminium oxide abrasive cloth – OMat 5/71 or Aluminium oxide paper – OMat 5/62 

 Degreaser 

 Acetone – OMat 150 or Isopropanol – OMat 1/40 
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No : 

72-AF572

Revision 2

ISSUED BY THE ENGINEERING CONFIGURATION DEPARTMENT 

 2009 Rolls-Royce plc 

The information in this document is the property of Rolls-Royce plc and may not be copied, or communicated to a third party, or 

used for any purpose other than that for which it is supplied without the express written consent of Rolls-Royce plc.

3. Accomplishment instructions

A. Introduction

This procedure uses an electrochemical process. The output is a colour difference on a filter paper, which 

identifies the difference in cobalt content of the two alloys. The C263 material has a large cobalt content and 

gives a blue/green colour output. The N75 material has a low cobalt content and gives a yellow colour output. 

Figures 1a and 1b show a typical metering panel. Access to the metering panel can be attained through the 

FSN port (Figure 1c). Note that this procedure should not be carried out in the presence of fuel vapour. 

 

 Figure 1a Figure 1b 

Figure 1a and 1b show a typical metering panel sub assembly 

Figure 1c shows the FSN port through which the metering panel can be accessed. 

Metering 

panel 

through 

the port 
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No: 

72-AF572

Revision 2

________________________________________________________________________________________ 

 2009 Rolls-Royce plc

B. Procedure to check for N75/C263 Alloy.

WARNING: 1. MAKE SURE THAT YOU USE APPLICABLE GLOVES AND EYE PROTECTION 

WHEN HANDLING CHEMICALS TO PREVENT INJURY TO PERSONNEL. 

 2. DO NOT INGEST ANY CHEMICALS DESCRIBED IN THE FOLLOWING 

PROCEDURE 

 3. THE HEALTH AND SAFETY DATA GIVEN IN THIS PROCEDURE ARE 

GENERAL GUIDELINES IN USE AT ROLLS-ROYCE; IT IS THE 

RESPONSIBILITY OF THE OPERATOR/USER TO OBTAIN DETAILED 

HEALTH AND SAFETY DATA FOR THE MATERIALS IN USE, AND TO 

LOCAL REGULATIONS, TO ENSURE SAFE WORKING PRACTICE 

RECOMMENDATION: 1. Before testing a single metering panel, carry out the following procedure on a 

sheet of N75 material and on a sheet of C263 supplied by Rolls-Royce. The two 

sheets provided by Rolls-Royce will be clearly marked with material type. This 

step will prove the test apparatus and set-up. If the two sheets do not give the 

expected result (i.e yellow for N75, blue/green for C263) then ensure that the 

procedure has been carried out correctly, and the apparatus is set up correctly. If 

the problem persists contact Rolls-Royce Service Engineering through your 

local field support office. 

RECOMMENDATION: 2. If testing a batch of metering panels, prove the material test process – as per 

Recommendation 1 – before testing the first and last metering panels in the 

batch. This will ensure the integrity of the test for the complete batch. 

1. Clean the test area with dry 180 grade SiC abrasive paper. If cleaning a test area on a built module 

make sure the strip of SiC paper is long enough to prevent release into the assembly. On the 

assembled unit there will only be visibility of the area shown in Figure 2. Figure 3 shows a typical 

view through a port. 

Figure 2 shows a close up of the metering panel 

Area that will 

be visible 

through the 

FSN port 
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No: 

72-AF572

Revision 2

________________________________________________________________________________________ 

 2009 Rolls-Royce plc

Figure 3 shows a view through a typical port. 

2. Wipe over the area with an isopropanol wipe to degrease and remove debris. 

3. Electrically connect (e.g. solder) the crocodile clip to an insulated copper wire. Electrically connect 

 R (e.g. solder) the other end of this copper wire to the positive terminal of the 18V battery power supply. 

 The crocodile clip is now the positive test electrode (or “anode”). 

4. Connect the positive test electrode to the metering panel as shown in Figure 4a and 4b. Ensure that the 

crocodile clip (the positive test electrode) is attached directly to the metering panel and not another 

component that is in contact with the metering panel. Ensure that the crocodile clip is within 20,0 mm 

of the area to be swab tested. 

 Figure 4a showing metering panel Figure 4b showing metering panel (RB211-524) 

 connected to positive terminal in FCL assembly connected to positive terminal 

Metering 

panel 
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No: 

72-AF572

Revision 2

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 2009 Rolls-Royce plc

 Figure 4c showing metering panel (RB211-535) in FCL assembly connected to positive terminal 

WARNING: MAKE SURE THERE ARE NO SOLVENTS AND FUELS IN THE AREA. TEST 

EQUIPMENT/PROCEDURE PRODUCES SPARKS THAT CAN IGNITE SOLVENTS/FUELS. 

5. If the metering panel is assembled in the combustion liner as shown in Figure 4b and 4c, it will be 

necessary to use a tweezers or adjustable pliers to attach the crocodile clip to the metering panel due 

to access constraints through the FSN port. See Figures 5a and 5b. The position on the metering panel 

where the crocodile clip can be easily attached will vary slightly depending on the standard of 

metering panel and burner seal ring. Figures 4b and 4c show typical attachment positions for the 

RB211-524 and RB211-535 respectively. 

WARNING: ENSURE THAT NO FOREIGN OBJECT DEBRIS (E.G. ABRASIVE PAPER, 

FILTER PAPER, DEGREASANT WIPES) DROPS INTO THE ASSEMBLED FRONT 

COMBUSTION LINER. 

 

Figure 5a showing crocodile clip in adjustable pliers Figure 5b showing use of adjustable pliers 

to attach crocodile clip 

6. Electrically connect (e.g. solder) the cylindrical aluminium rod to an insulated copper wire. Cover the 

 electrical join with an insulating sleeve of rubber or PVC. Electrically connect (e.g. solder) the other

R end of this copper wire to the negative terminal of the 18V battery power supply. The cylindrical 

 aluminium rod is now the negative test electrode (or “cathode”). 

7. Touch the aluminium rod (negative test electrode) on to the metering panel to ensure a spark is 

generated as per Figure 6. Clean the area again if no spark is seen and check the battery voltage. 
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No: 

72-AF572

Revision 2

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 2009 Rolls-Royce plc

Figure 6 shows a spark test 

8. Wet a section of filter paper (e.g. Watman no 2) with 2-3 drops of 5% sodium fluoride solution, so the 

filter paper is just damp. 

9. Put the damp filter paper against the metering panel and press on with the negative test electrode to 

make a full electric circuit. Hold in position for 2-3 seconds. 

Figure 7 shows the full electrochemical cell test with the Sodium Fluoride damp filter paper 

between the metering panel and the –ve electrode. 

10. Remove the negative test electrode from the filter paper. Remove the filter paper from the metering 

panel. Within 30 seconds of removal, put 1-2 drops of 5% Potassium Thiocyanate in Acetone on the 

damp filter paper where the filter paper has been in contact with the metering panel. 

Figure 8 shows adding the Thiocyanate to the filter paper from step 10. 

Damp filter 

paper 
RB211 Propulsion System 

NON-MODIFICATION SERVICE BULLETIN 

Mod No: 

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Revision 2

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 2009 Rolls-Royce plc

NOTE: The colour change will start to fade within 20-30 seconds; therefore ensure a note of the 

colour is made immediately after adding the Potassium Thiocyanate. 

11. Observe the colour change on the filter paper test area. The C263 material gives a blue / green colour. 

The N75 material stays a yellow colour. See Figures 9a and 9b. 

 

Figure 9a N75 colours Figure 9b C263 colours 

12. Remove the test electrodes from the metering panel. Clean the metering panel test area with an 

isopropanol wipe. 

13. If the FCL metering panel is identified as N75 material, contact Rolls-Royce Technical Services 

immediately and quarantine the part. 

14. If the FCL metering panel is identified as C263 material, record accomplishment of the testing 

procedure (NMSB) in Engine Log Book. 

C. A record of accomplishment is required. 

D. Contact Rolls-Royce Service Engineering with the results of the test through your local field support office 

(FSO).