LIST OF EFFECTIVE PAGES

The effective pages to this Service Bulletin are as follows:

Page Revision Number Revision Date

Bulletin

1 Feb.27/12

2 Feb.27/12

3 Feb.27/12

4 Feb.27/12

5 Feb.27/12

6 Feb.27/12

7 Feb.27/12

8 Feb.27/12

9 Feb.27/12

10 Feb.27/12

11 Feb.27/12

12 Feb.27/12

13 Feb.27/12

14 Feb.27/12

15 Feb.27/12

16 Feb.27/12

17 Feb.27/12

18 Feb.27/12

19 Feb.27/12

20 Feb.27/12

21 Feb.27/12

22 Feb.27/12

23 Feb.27/12

24 Feb.27/12

25 Feb.27/12

Appendix 1

1 Feb.27/12

2 Feb.27/12

3 Feb.27/12

4 Feb.27/12

5 Feb.27/12

Appendix 2

1 Feb.27/12

2 Feb.27/12

3 Feb.27/12

Printed in Great Britain

RB.211−72−AG873

Transmittal - Page 2
1. Planning Information

A. Effectivity

Airbus A330

RB211 Trent 768 Engines Post SB 72-F117 and pre SB72-F227 HP/IP Structure part

number FW47425

RB211 Trent 772 Engines Post SB 72-F117 and pre SB72-F227 HP/IP Structure part

number FW47425

RB211 Trent 772B Engines Post SB 72-F117 and pre SB72-F227 HP/IP Structure part

number FW47425

RB211 Trent 772C Engines Post SB 72-F117 and pre SB72-F227 HP/IP Structure part

number FW47425

Engine Serial Nos. 41221, 41425, 41428, 41430, 41431, 41432, 41435, 41437,

41438, 41440, 41442, 41445, 41446, 41451, 41452, 41454, 41455, 41456, 41459,

41460, 41461, 41462, 41463, 41464, 41465, 41466, 41468, 41469, 41470 and 41471.

B. Reason

One Trent 700 engine removal event occurred in August 2011, caused by high oil

consumption. Overhaul shop investigation found a small hole in the oil feed

tube of the HP/IP Bearing Support structure caused by outer heat shield

frettage.

The build records and physical part identification marking indicated that the

HP/IP structure fitted to this engine was FW47425 (Post 72-F117) standard and

should have not have had the outer heat shield fitted on the oil feed tube.

Manufacturing investigation as to why this structure had a Pre SB 72-F117

standard outer heat shield fitted has proven inconclusive. Therefore, further

post SB 72-F117 standard structures could be in service with pre-SB72-F117

outer heat shields fitted to the oil feed tube. NMSB 72-AF045 requires the

inspection of all pre SB 72-F117 standard oil feed heat shields for cracking

and tube frettage

Frettage damage may occur on the oil feed tube within the HP/IP turbine

bearings support which can result in oil leakage into the IP nozzle guide vane

and areas adjacent to the HP/IP support structure. The frettage is attributed

to contact with the tubes outermost heat shield, which may crack under thermal

distress around one of the attaching clips and become detached and free to move

on the oil tube, resulting in frettage damage to the tube wall.

ENGINE - INSPECTION OF POST SB72-F117 HP/IP TURBINE OIL FEED TUBE FOR INCORRECT OUTER

HEAT SHIELD FITMENT AND DAMAGE - NON-MODIFICATION SERVICE BULLETIN - NON -

MOD.72-AG873

Printed in Great Britain

RB.211−72−AG873

Page 1 of 25

Feb.27/12

Feb.27/12
Service Bulletin 72-F117 introduced a revised HP/IP turbine bearing support

structure FW47425, similar to the existing item but incorporating changes to

eliminate the possibility of frettage damage occurring between the outer

section of the oil feed tube and associated outer insulation heatshield by

deleting the outer insulating heat shield on the oil feed tube, together with

the two retaining clips and rivets.

C. Description

This NMSB instructs an initial inspection of the oil feed pipe to confirm if

the outer heat shield is incorrectly fitted and repeat inspection of the oil

feed tube outer heat shield if required. The purpose of the inspection is to

identify incorrectly fitted heat shields, instruct inspection of these heat

shields for any damage which might lead to fretting of the oil tube, and also

to identify any tube damage which might already be present. The inspection can

be carried out on engines on-wing, or on fully built engines off-wing, and also

on 05 Modules in the overhaul shop, at any level of rework.

During overhaul of the 05 module, any incorrectly fitted oil tube heat shields

should be removed, the feed tubes require inspected and repaired if found

damaged. Therefore the threshold life for this inspection is based on life

since new or since overhaul of the 05 module. The repeat inspection interval

will be dependent on heat shield condition at the previous inspection.

IOR Service Bulletin 72-G874 permits the continued operation of the engine with

a Pre SB72-F117 (FW34763) oil feed tube heat shield, fitted to a Post SB

72-F117 (FW47425) HP/IP bearing structure. NMSB 72-AG873 instructs the on-wing

inspection of the HP/IP turbine oil feed tube outer heat shields for cracking.

Record all inspection, on findings Table 1 (on-wing), Table 2 (in-shop) and

return to Rolls-Royce via your local Rolls-Royce Field Service Office.

D. Compliance

ALERT

The actions described in section 3. Accomplishment Instructions of this

Non-Modification Service Bulletin (NMSB) should be accomplished as below:

Inspect all engines listed in section 1.A. Effectivity at the next convenient

maintenance opportunity, and within 4 months of initial issue of this NMSB.

Rolls-Royce understand that this NMSB will be the subject of a European

Aviation Safety Agency (EASA) approved Airworthiness Directive (AD).

Printed in Great Britain

RB.211−72−AG873

Page 2

Feb.27/12

Feb.27/12
(1) Inspection On-Wing

Carry out the action specified in 3. Accomplishment Instructions, Part A,

as follows:

(a) For 05 modules which have not been previously inspected in accordance

with this NMSB, carry out the action at an 05 module threshold life of

10,000 hours or 2,500 cycles (whichever occurs first) since new or

since 05 module overhaul:

(i) For 05 modules that exceed the threshold life at the time of

issue of this NMSB, carry out the action within 4 months of

issue of the NMSB.

(ii) For 05 modules that are below the threshold life at the time of

issue of the NMSB, carry out the action within 3 months of

reaching the threshold life.

(b) Determine the serviceability and the interval to next inspection as

follows (for flowchart, refer to Appendix 2):

(i) If there is no oil feed tube outer heat shield fitted to the

HP/IPT support assembly, then accept the engine, no further

inspection required.

(ii) HP/IPT support assemblies with no visible damage to the feed

tube outer heat shield must be re-inspected at an interval not

greater than 10,000 hours or 2500 cycles, which ever occurs

first.

(iii) HP/IPT support assemblies with partial cracking up to 90

degrees around the circumference or 10 mm along the length of

the feed tube outer heat shield must be re-inspected at an

interval not greater than 6,400 hours or 1600 cycles, which

ever occurs first.

(iv) HP/IPT support assemblies with cracking in excess of that in

step (b)(iii) but less than 360 degrees around the

circumference of the feed tube outer heat shield must be

re-inspected at an interval not greater than 1,600 hours or 400

cycles whichever occurs first.

(v) HP/IPT support assemblies with no feed tube outer heat shield

material remaining that can cause further frettage are

acceptable for continued operation with no further inspection

to this NMSB, subject to any existing frettage being less than

0,46 mm (0.018 in.) depth.

Printed in Great Britain

RB.211−72−AG873

Page 3

Feb.27/12

Feb.27/12
(vi) HP/IPT support assemblies with cracking around the complete

circumference of the feed tube outer heat shield, or with

missing material from the feed tube outer heat shield, where

insulation blanket material has prevented frettage between the

heat shield and tube, must be re-inspected at an interval not

greater than 1,600 hours or 400 cycles whichever occurs first.

(vii) HP/IPT support assemblies with cracking around the complete

circumference of the feed tube outer heat shield, or with

missing material from the feed tube outer heat shield, where it

is possible to assess the depth of existing frettage around the

full 360 degrees and it is acceptable to step (b)(ix) , must be

re-inspected at an interval not greater than 400 hours or 100

cycles whichever occurs first.

(viii) HP/IPT support assemblies with cracking around the complete

circumference of the feed tube outer heat shield, or with

missing material from the feed tube outer heat shield, must be

rejected from service within 50 cycles of the inspection being

carried out, if the depth of frettage can not be assessed, and

if the alleviation described in step (b)(vi) is not applicable.

(ix) HP/IPT support assemblies with surface frettage depth greater

than 0,46 mm (0.018 in.) on the feed tube at the outer heat

shield position must be rejected from service within 10 cycles

of the inspection being carried out.

NOTE: All areas of the tube adjacent to a 360 degree

circumferential crack or areas of missing heat shield

material must be inspected for frettage.

(c) For 05 modules which have been previously inspected in accordance with

this NMSB:

(i) Carry out the action at the interval determined in steps

1.D.(1)(b) or 1.D.(2)(b), whichever was the most recent

previous inspection.

(ii) Determine the serviceability and the interval to next

inspection as detailed in step 1.D.(1)(b).

(2) Inspection In-Shop

Carry out the action specified in 3. Accomplishment Instructions, Part B,

as follows:

(a) At every shop visit.

Printed in Great Britain

RB.211−72−AG873

Page 4

Feb.27/12

Feb.27/12
(b) Following inspection in-shop, determine the serviceability and the

repeat inspection interval of the HP/IP turbine support assembly as

follows:

(i) If there is no oil feed tube outer heat shield fitted to the

HP/IPT support assembly, then accept the engine, no further

inspection required.

(ii) If there is no damage to the feed tube outer heat shield, then

remove the heat shield as per SB 72-F117 and accept the engine,

no further inspection required.

(iii) If there is any missing material and/or cracked of the heat

shield, then remove the heat shield as per SB 72-F117 and

inspect the oil feed tube for fretting. If oil feed tubes has

no damage, then accept the engine/module with no further

inspection required to this NMSB.

(iv) If the feed tube has any frettage damage, reject the module and

carry out inspection in accordance with Engine Manual Task

72-51-24-200-801, Examine the HP/IP Turbine Bearing Support

Assembly.

NOTE: If In-shop, then the NMSB inspection must be carried out

regardless of module life since new or overhaul, and

regardless of life since previous inspection to this NMSB.

NOTE: For the purposes of this NMSB, the term '05 module

overhaul' refers to an 05 module shop visit where the HP/IP

turbine internal oil tubes have been exposed and the tube

heat shields subjected to a detailed visual inspection in

accordance with Engine Manual Task 72-51-24-200-801,

Examine the HP/IP Turbine Bearing Support Assembly.

E. Approval

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

under the authority of Design Organisation Approval EASA.21J.035 on Feb.24/12.

F. Manpower

(1) On-Wing

NOTE: This does not include time to gain access to the core engine, or

carry out ground running.

(a) Time to remove core engine dressings to gain access to the internal

oil tube:

1 hour elapsed time

Printed in Great Britain

RB.211−72−AG873

Page 5

Feb.27/12

Feb.27/12
(b) Time to carry out inspection:

0.5 hours elapsed time

(c) Time to restore to serviceable condition:

0.5 hours elapsed time

(d) Number of people required for inspection:

2 persons

(e) Ground running requirement:

Fuel and oil leak test

(f) No special training required

(2) In-Shop

NOTE: Assumes that the inspection is carried out after removal of the 05

module, with the module in the build stand.

(a) Time to carry out inspection:

0.5 man hours

(b) Number of people required for inspection:

1 person

(c) Standard pass-off testing is sufficient for leak test

(d) No special training required

G. Material Requirements

A replacement external oil tube is required if the original tube is cut off in

accordance with Appendix 1.

(1) External Oil Feed Tube, EIPC 79-22-49, 02-100, P/N FW14193

H. Tooling Requirements

(1) Flexible borescope 6 mm diameter with straight ahead viewing tip and

sideways viewing tip.

(2) Stainless steel rod diameter 8 mm, 250 mm minimum length, local supply.

Remove all sharp edges, and radius both ends 1 mm minimum radius. (To fit

inside feed tube)

Printed in Great Britain

RB.211−72−AG873

Page 6

Feb.27/12

Feb.27/12
(3) 2 m length of lightweight nylon rope, local supply.

(4) Tooling/Consumables required for Oil Tube Union Cutting Procedure

(Appendix 1):

(a) HU40179-1

(b) Portable electric drill 230 RPM

(c) Pipe Cutting Tool or Tube Cropping Tool (swarf-free cutting process)

(d) Vacuum cleaner - with 8 mm diameter suction hose

(e) Engine oil

I. References

(1) Rolls-Royce RB211 Service Bulletins:

(a) 79-D102

Oil - Oil System Tubes and Fittings - Core Engine - Introduction of

revised HP/IP Turbine Structure Oil Tubes

(b) 72-E708

Engine - HP/IP Bearing Support - Introduction of a revised HP/IP

Turbine Bearings Support Structure with Re-positioned HP3 Cooling Air

Holes and Deleted Oil Service Tube Heatshields

(c) 72-F117

Engine - HP/IP Bearing Support - Introduction of a revised HP/IP

Turbine Bearings Support Structure with Deleted Oil Feed Tube Outer

Heatshield

(d) 72-F227

Engine - HP/IP Bearing Support - Introduction of an HP/IP Turbine

Bearings Support Structure with revised Oil and Air Service Tubes and

Associated Insulated Heatshield Covers

(2) Rolls-Royce RB211 Non-Modification Service Bulletin:

(a) 72-AF045

Engine - Inspection of the HP/IP Turbine Oil Feed Tube Outer Heat

Shield for Damage - Non-Modification Service Bulletin

Printed in Great Britain

RB.211−72−AG873

Page 7

Feb.27/12

Feb.27/12
(3) IOR Service Bulletins:

(a) 72-F048

Engine - HP/IP Turbine Bearing Support On-wing - Removal of Oil Feed

Tube Outer Heat Shield

(b) 72-G874

TRENT 700 - HP/IP Turbine Bearing Support - Continued Operation of the

Engine with a Pre SB 72-F117 Oil Feed Tube Heat Shield Installed on a

FW47425 (Post SB 72-F117)

(4) Engine Overhaul Information Notice Number 37, HP/IP Turbine Support

Assembly - Overhaul inspection requirements for oil and air service tubes

(5) Engine Manual Task 72-51-24-200-801, Examine the HP/IP Turbine Bearing

Support Assembly

(6) Engine Manual Task 72-51-24-300-032, HP/IP Turbine Bearing Support

Assembly - Repair damaged oil tubes and end adaptors by orbital welding

(7) Aircraft Maintenance Manual 71-00-00-700-827, Test 2 The Fuel and Oil Leak

Test

Printed in Great Britain

RB.211−72−AG873

Page 8

Feb.27/12

Feb.27/12
2. Material Information

A. None

Printed in Great Britain

RB.211−72−AG873

Page 9

Feb.27/12

Feb.27/12
3. Accomplishment Instructions

A. On-wing

CAUTION: IN ORDER TO REDUCE THE POTENTIAL FOR MULTIPLE ENGINE IN-FLIGHT SHUT

DOWN, POWER LOSS, OR OTHER ANOMALY DUE TO MAINTENANCE ERROR, ROLLS-ROYCE

RECOMMENDS THAT OPERATORS AVOID PERFORMING MAINTENANCE ON MULTIPLE

ENGINES INSTALLED ON THE SAME AIRCRAFT AT THE SAME TIME. IF IT IS NOT

POSSIBLE TO AVOID MAINTENANCE ON MORE THAN ONE ENGINE AT THE SAME TIME,

ROLLS-ROYCE RECOMMENDS THAT ADDITIONAL CONTROLS ARE APPLIED IN ORDER TO

ENSURE THAT MAINTENANCE TASKS HAVE BEEN COMPLETED AS DEFINED.

MAINTENANCE GUIDELINES SHOULD BE REVISED, WERE POSSIBLE, TO PROMOTE THIS

RECOMMENDATION.

(1) Inspection of the HP/IPT Outer Heat Shield on the Oil Feed Tube

CAUTION: FOR ENGINES PRE SB 79-D102, DO NOT EXCEED A TORQUE OF 1000

LBF.IN AND FOR ENGINES POST SB 79-D102, DO NOT EXCEED A TORQUE

OF 1500 LBF.IN. WHEN DISCONNECTING THE UNION NUT, OTHERWISE THE

INTERNAL OIL VENT TUBE MAY BECOME DAMAGED.

NOTE: If the post-SB 79-D102 standard union cannot be disconnected, carry

out the tube union nut cutting procedure in Appendix 1 to remove

the union nut.

(a) Disconnect the external HP/IPT oil feed tube, EIPC 79-22-49, 02-100,

from the union with the 05 Module. See Fig.1.

(b) Loosen the external feed tube clips and in-line connector, to allow

the tube to be moved away from the internal feed tube.

(c) Remove the anti-rotation sleeve from the IP turbine casing, EIPC

72-51-23, 01-220.

(i) Remove the two bolts EIPC 72-51-23, 01-222.

(ii) Use a drift if necessary, to remove the sleeve from the casing.

CAUTION: CONFIRM THAT THE ROD IS RADIUSED 1MM MINIMUM AND FREE OF SHARP

EDGES, TO AVOID DAMAGE TO THE INTERNAL SURFACES OF THE FEED TUBE

(d) Carefully insert the stainless steel rod into the internal feed tube

until it makes light contact with the first bend. Pull the rod upwards

to deflect the tube, until the tube end fitting contacts the IPT

casing. This will allow sufficient clearance between the tube end

fitting and IPT casing for borescope access. See Fig 3.

(e) Use the lightweight rope to secure the rod and hold the tube in this

position, by attaching the rope to suitable bolts on the 04/05 module

flanged joint.

Printed in Great Britain

RB.211−72−AG873

Page 10

Feb.27/12

Feb.27/12
CAUTION: YOU MUST NOT CARRY OUT THE HEAT SHIELD INSPECTION WHILE THE

ENGINE IS STILL HOT, BECAUSE THIS MIGHT CAUSE DAMAGE TO THE

BORESCOPE. IF IN DOUBT, REMOVE THE BORESCOPE AFTER A SHORT PERIOD

OF TIME AND CHECK FOR OVERHEATING

(f) Carry out a borescope inspection of the lower half of the outer heat

shield on the HP/IPT internal oil feed tube.

(g) Remove the flexible borescope.

(h) Release the rope securing the rod. Use the rod to move the internal

feed tube downwards until the tube end fitting contacts the IPT

casing. Secure the rod in this position using the lightweight rope.

(i) Carry out a borescope inspection of the upper half of the outer heat

shield.

(j) Remove the flexible borescope.

(k) Release the rope securing the rod.

NOTE: Table 1 suggests different categories of damage to the heat

shield.

(l) Record the condition of the outer heat shield in Table 1. Refer to

Figs 4 to 7, for examples of different heat shield conditions.

(m) Install the anti rotation sleeve, EIPC 72-51-23, 01-220.

NOTE: It might be necessary to use the stainless steel rod to

centralise the feed tube relative to the hole in the IPT casing

before installation of the anti-rotation sleeve.

(i) Align the sleeve with the internal oil feed tube and install

the sealing sleeve to the IP turbine case.

(ii) Attach the sleeve with the two bolts, and torque tighten bolts

to 4,5 Nm (40 lbf.in.)

(n) Install the external feed tube, EIPC 79-22-49, 02-100, to the oil tube

and IP turbine case.

(i) Assemble the clip positions 4366, 4405, 4396, 4397 and 4398,

see Fig.2.

(ii) Torque the tube connector to oil tube, to 33 Nm (295 lbf.in.)

and the tube connector to the IP turbine case, to 27 Nm (240

lbf.in.). Safety with OMat 2/142 safety cable.

(iii) Torque the clip bolts to 6,2 Nm (55 lbf.in.).

Printed in Great Britain

RB.211−72−AG873

Page 11

Feb.27/12

Feb.27/12
(2) Acceptance Limits

(a) Accomplishment of this Non-Modification Service Bulletin should be

recorded in accordance with local SB tracking system procedures.

(b) If the oil feed tube outer heat shield are not present, then accept

the engine, no further inspection required.

(c) If there is no damage to the oil feed tube outer heat shield, then

accept the engine, subject to re-inspection at the interval specified

in step 1.D.(1)(b)(ii).

(d) If there is partial cracking of the feed tube outer heat shield up to

an angle of 90 degrees of the circumference or less than 10 mm along

the length of the heat shield, then accept the engine, subject to

re-inspection at the interval specified in step 1.D.(1)(b)(iii).

(e) If there is cracking greater than in step (2)(d) but less than 360

degrees around the circumference of the feed tube outer heat shield,

then accept the engine, subject to re-inspection at the interval

specified in step 1.D.(1)(b)(iv).

(f) If the feed tube outer heat shield is cracked around the complete

circumference, or there is any missing material from the heat shield

or the heat shield has fretted against the tube, refer to the

acceptance criteria in steps 1.D.(1)(b)(v) to (ix) to determine the

interval to next inspection or engine removal.

(3) Leak Test

(a) Carry out Test Number 2, The Fuel and Oil Leak Test in accordance with

AMM Task 71-00-00-700-827, Test 2.

B. In-Shop

(1) For 05 Modules not undergoing strip and overhaul:

(a) Carry out inspection of the HP/IPT internal oil feed tube outer heat

shield in accordance with Section 3.A.(1).

(b) If the oil feed tube outer heat shield are not present, then accept

the engine, no further inspection required.

(c) If there is no damage to the feed tube outer heat shield, then remove

the heat shield as per SB 72-F117 and accept the engine, no further

inspection required.

(d) If there is any missing material and/or cracked of the heat shield,

then remove the heat shield as per SB 72-F117 and inspect the oil feed

tube for fretting. If oil feed tubes has no damage, then accept the

engine/module with no further inspection required to this NMSB.

Printed in Great Britain

RB.211−72−AG873

Page 12

Feb.27/12

Feb.27/12
(e) If the feed tube outer heat shield is cracked, or there is any missing

material from the heat shield, but oil feed tube has not fretted

damage, then remove the heat shield from the oil feed tube, then

accept the engine/module, with no further inspection to this NMSB.

(f) If the feed tube has any frettage damage, reject the module and carry

out inspection in accordance with Engine Manual Task 72-51-24-200-801.

NOTE: Table 2 is a copy of the report sheet from Engine Overhaul

Notice Number 37, which is also used to record the condition of

other aspects of the HP/IP turbine support oil and air tube,

eg; vent tube carbon and inner heat shield condition.

(g) Accomplishment of this Non-Modification Service Bulletin should be

recorded in the engine logbook.

(2) For 05 Modules undergoing strip and overhaul:

NOTE: During 05 Module overhaul, the oil tube outer heat shields are

exposed, hence the borescope procedure described in section 3.A. of

this NMSB is not necessary.

(a) Carry out inspection of the HP/IPT internal oil vent and scavenge tube

outer heat shields in accordance with Engine Overhaul Notice Number 37

and Engine Manual Task 72-51-24-200-801.

(b) Report all findings to Rolls-Royce on Table 2.

Printed in Great Britain

RB.211−72−AG873

Page 13

Feb.27/12

Feb.27/12
Oil Feed Tube

Fig.1

Printed in Great Britain

RB.211−72−AG873

Page 14

Feb.27/12

Feb.27/12
Clip Position 4145

Fig.2 (sheet 1 of 6)

Printed in Great Britain

RB.211−72−AG873

Page 15

Feb.27/12

Feb.27/12
Clip Position 4396

Fig.2 (sheet 2 of 6)

Printed in Great Britain

RB.211−72−AG873

Page 16

Feb.27/12

Feb.27/12
Clip Position 4397

Fig.2 (sheet 3 of 6)

Printed in Great Britain

RB.211−72−AG873

Page 17

Feb.27/12

Feb.27/12
Clip Position 4398

Fig.2 (sheet 4 of 6)

Printed in Great Britain

RB.211−72−AG873

Page 18

Feb.27/12

Feb.27/12
Clip Position 4851

Fig.2 (sheet 5 of 6)

Printed in Great Britain

RB.211−72−AG873

Page 19

Feb.27/12

Feb.27/12
Clip Position 4405

Fig.2 (sheet 6 of 6)

Printed in Great Britain

RB.211−72−AG873

Page 20

Feb.27/12

Feb.27/12
To Show use of Stainless Steel Rod and Lightweight Rope to Displace Oil Feed Tube

for Borescope Access

Fig.3

Printed in Great Britain

RB.211−72−AG873

Page 21

Feb.27/12

Feb.27/12
Undamaged Heat Shield

Fig.4

Printed in Great Britain

RB.211−72−AG873

Page 22

Feb.27/12

Feb.27/12
Heat Shield Cracked up to 90 degrees

Fig.5

Printed in Great Britain

RB.211−72−AG873

Page 23

Feb.27/12

Feb.27/12
Heat Shield Cracked more than 90 degrees but less than 360 degrees

Fig.6

Printed in Great Britain

RB.211−72−AG873

Page 24

Feb.27/12

Feb.27/12
Heat Shield Cracked 360 degrees

Fig.7

Printed in Great Britain

RB.211−72−AG873

Page 25

Feb.27/12

Feb.27/12
Procedure for Cutting off a Seized Feed Tube Union Nut

1. Effectivity

This procedure is applicable to the HP/IP turbine oil feed tube SB 79-D102

standard.

NOTE: This procedure is not applicable to pre SB 79-D102 standard oil tubes.

Based on service experience, pre SB 79-D102 standard union nuts are not

susceptible to seizure.

2. Description of Procedure

The procedure cuts through the thrust shoulder of the union nut. This removes

the axial load from the union nut threads, which reduces the torque required to

unscrew the nut. The union nut and external tube are destroyed in the

procedure. The depth stop on the cutting tool prevents the cutting tool from

making contact with the internal oil tube end fitting, so the internal oil tube

is not damaged by this procedure.

3. Tools and Consumables

A. HU40179-1 - Hole cutting tool

B. Portable electric drill - 230 RPM

C. Pipe cutting tool or tube cropping tool (swarf-free cutting process)

D. Vacuum cleaner - with 8 mm diameter suction hose

E. Engine oil

4. Material Requirements

A. A replacement external oil tube is required if the original tube is cut

off.

(1)External oil feed tube, EIPC 79-22-49, 02-100, P/N FW14193

5. Procedure

A. Disconnect the external oil tube in-line connector, and all tube clips,

refer to steps 3.A.(1)(b) or 3.A.(2)(b).

B. Cut the external tube a maximum length of 30 mm (1.18 in.) from the union

nut, see Fig.8. Use a manual pipe cutting tool or cropping tool to avoid

making any cutting debris.

C. If the tube is open ended, close the end of the cut tube using a temporary

bung, to prevent ingress of contamination.

APPENDIX 1

Printed in Great Britain

RB.211−72−AG873

Appendix 1 - Page 1 of 5

Feb.27/12

Feb.27/12
D. Lubricate the shoulder of the union nut with clean engine oil.

CAUTION: WHEN THE CUTTING TOOL BREAKS THROUGH THE UNION NUT SHOULDER, THE NUT

CAN TURN WITH THE CUTTING TOOL. WHEN THIS HAPPENS, STOP CUTTING

IMMEDIATELY, BECAUSE IF THE NUT IS ROTATED THROUGH SEVERAL TURNS, THE

CUTTING TOOL CAN MAKE CONTACT WITH THE INTERNAL OIL TUBE END FITTING

E. Cut through the shoulder of the union nut, using the hole cutting tool

HU40179-1 and the electric drill.

F. Remove all swarf, using the vacuum cleaner.

G. Remove the union nut. Do not allow any debris to drop into the open end of

the internal oil tube.

Printed in Great Britain

RB.211−72−AG873

Appendix 1 - Page 2

Feb.27/12

Feb.27/12
Union Nut Cutting Tool shown in situ on the HP/IP Feed Tube

Fig.8

Printed in Great Britain

RB.211−72−AG873

Appendix 1 - Page 3

Feb.27/12

Feb.27/12
On-Wing Inspection Findings

Engine Serial

Number:

05 Module Serial

Number:

Engine Operator: Inspection Date:

Overhaul Base: Maintenance Agent:

05 Module Life

Since New:

Hours:

05 Module

Life Since

Overhaul:

Hours:

Cycles: Cycles:

Feed Tube Outer Heat Shield

Heat Shield Fitted:

Yes / No

Heat Shield Condition*

Type of damage and location

Is the damage axial or radial?

What is the approximate length of

cracking?

Is any material missing?

The following categories are suggested to quantify level of damage to the heat

shields:

#1 - No damage

#2 - Limited damage (cracking up to 10 mm in length or 90 degrees around

circumference)

#3 - Moderate damage (cracking greater than #2 but less than 360 degrees

around circumference)

#4 - Heavy damage (cracking around the complete 360 degrees/missing

material/tube is fretted)

Table 1

Printed in Great Britain

RB.211−72−AG873

Appendix 1 - Page 4

Feb.27/12

Feb.27/12
In-Shop Inspection Findings

Engine Mark / Engine

Serial Number:

Module 51 Serial

Number:

Operator: Overhaul Base and

Induction Date:

Module Life Since

New:

Hours: Module Life

Since M05

Overhaul:

Hours:

Cycles: Cycles:

Condition Vent Tube Feed Tube Scavenge

Tube

Buffer Air

Tubes

Inner Heat Shield

Condition (pre-cleaning)

Outer Heat Shield Fitted

(Yes / No)

Post SB72-E708

Yes / No

Post

SB72-F117

Yes / No

Post

SB72-E708

Yes / No

Not

Required

Outer Heat Shield

Condition (pre-cleaning)

Borescope Inspection

Results - Carbon

Thickness (pre-cleaning)

Not

Required

Maximum galling depth -

inner tube

Maximum galling depth -

outer tube

Borescope Inspection

Results - Carbon

Thickness (after

cleaning)

Not

Required

Repair action required,

eg: replace heat shield /

tube

Table 2

Printed in Great Britain

RB.211−72−AG873

Appendix 1 - Page 5

Feb.27/12

Feb.27/12
On-wing Inspection Flowchart

APPENDIX 2

Printed in Great Britain

RB.211−72−AG873

Appendix 2 - Page 1 of 3

Feb.27/12

Feb.27/12
Printed in Great Britain

RB.211−72−AG873

Appendix 2 - Page 2

Feb.27/12

Feb.27/12
Printed in Great Britain

RB.211−72−AG873

Appendix 2 - Page 3

Feb.27/12

Feb.27/12