### CAATransltrfirstPage(RIGHT>

- May 15/09 1
Rolls-Royce Deutschland Ud & Co KG Eschenweg 11 , Dahlewltz 15827 Blankenfelde - Mahlow Germany Tel : +49 (0) 33-7088-1944 Fax: +49 (0)33-7086-32 76 

# I Rolls-Royce P U B L 

## C A T 0 N 

## T R A N S M T T A L The technical Information contained I n thls document Is approved under the authority of EASA D esign Organ isation Approval No
. EASA.2 1J.065
.



### TAY SERIES PROPULSION SYSTEM SERVICE BULLETIN 

# ALERT
This document transmits Revision 1 of N on-Modification Service Bulletin TAY-72-A1696.**~:** 

### If the Initial Issue of this Non-Modification Service Bulletin is already incorporated, no further Operator action is required with this Revision. Oocyment Hi s tory Non-Modification Service Bulletin Revisi on Status Ini-ti'al Is s ue Dec
. 8/06 

### Non

- Modification Service Bulletin Reyisjon 1 

### Remove All 

### pages of the Non-Modification Service Bl:Jl teti't f. 

### Incorp orate Pages 1 

### to 11 

### of the Non-Modification**s~fr'\iiC e**  

## suneHn. Reason for change To change the 

### C?

_ mp**~ ~11~~**  

### ..**c~ r**  

### . .**o~ ~he**  

### Non-Modification Service Bulletin from RECOMMENDED to ALERT and to include some minor editorial changes
.


# ALERT T A Y-72-A 1696 Transmittal

- Page 1 of 1

RETAIN TIM I.ETTE R OF TRANSMITTAl.-**CHE~** THAT ALL PREVIOUS T RAN S MITTIII.. S H A VE BEE N I NCORPORATED If •"Y havo not t>oen rooolvod ploa$G 0<1Vise1ho Publlc.rldon Servl.:os ll<lpotlmer1! 111 1M lol:o.Mng lddrosa: Roi<· Aoyc41)1c. PO 8cnc 31
. Oert>y OE2 4 88.1
. Eng'-'d or r>-rnal-**adnni)Ublic.dcn royce**  com C**Adls-~** O<Moclllanr! Ud & Co l<G (oale oc 111>0110) Pnrru!Oin Groat Bnta1t1. 

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### t.:. [ ·· !}Rolls - Royce D eutsc hl an d Ltd & Co KG EMP Key S e rv i ce Bulleti n Deci si on Proforma

1 Is this SB the subject of an airworthiness directive? 2 Does this SB affect safety? 3 Does this SB affect reliability? (Will it reduce service disruption and/or improve on-wing engine life?) 4 Does this SB provide a performance en hancement? 5 Does this SB reduce cost of ownership? (Will It reduce shop vlslt costs?) 

### 6 Is the effect on performance significant? 7 Is the SB covered by campaign action or is the SB the subject of a previous wor1d wide communication? 8 Does the SB address a service problem, which affects most operators? 9 Does the SB remove the requirement for routine inspection and/or is the cost of embodiment realised in a reasonable period of time? Decis i on EE - 9: Com ments/ J usttficatlon : Teamleader I authorised Person

10 Key SB 11 No Key SB 

### 0 Recommended L evel of Rework (8R715 only) L1 0 L2 0 L3 0 First En gine Se rla U N o.: Refe r t o th e NMSB

. 

### j oa t e to EE-9: 27.02.2012

Yes 

### 0 goto 

### 10 No 

### H._go to 2 Yes

## ~~oto 10 N o go to 3 Yes 

### 0 go to 7 No 

### 0 g_o to 4 Yes 

### 0 go to 6 No 

### 0 goto 5 Yes 

### 0 go to 9 No 

### 0 goto 

### 11 Yes 

### 0 go to 9 No 

### 0 goto 11 Yes 

### 0 go to 

### 10 No 

### · 0 go to 8 Yes 

### 0 go to 9 N o 

### 0 goto 

### 11 Yes 

### 0 go to 

### 10 No 

### 0 goto 11

Name: Date:

V e rification 

### PC-32: Com m e n ts (I f different verification to EE-9 discuss with EE-9 ) :

# Name~-:5.**~** Teamieader I authorised Person)

·· Key -SB· ··· · ·· · ·

### -·· · -

### ~te:**·· U>** **hJ** 

# liz
. .. No K e ySB 

### 0 ..- J Verify Level of Rework (8R715 only) L1 0 L2 0 L3 0 (Rerum sheet to the Se<voce Butlelin Group) Ve ri fication PC-31: Comm ents: (Teamieader I Fleet BUSiness Manaaerl Name: K eySB 

### 0 Date: 

### No K e ySB 

### 0**~haroe ~21g**  TIM 17l!! &**!1~** l!!llxl (T

eamleadet I Fleet Business Manager} Cha r geable 

### 0 Non chargeable 

### 0 VA 19-0256 i ssue 2008-07 July 2003 (I nform the SeMCe Bunetltl G<oop abOvt deCision t: 

## !: 

# IBodyFirstPageCRIGHT)

- May 15/09 20001 

# fFil 

# II® TAY PROPULSION SYSTEM 

## SERVICE BULLETIN ENGINE

- TURBINE NOZZLE CASE ANP VANES-Hp AND LP

- INSPECTION OF THE BOLTS WHICH ARE INSTALLED IN THE LPT STAGE 1 STATIC AIR SEAL AND OF THE BOLTS WHICH ARE INSTALLEp IN THE HPJ STAGE 1 AIR SEAL SUPPORT

- NON-MOQlFICATION SERVICE BULLETIN 1. Plaonjnq Information A. Effectivity (1) Gulfstream IV. Jay 611-8 Engines. Fo r Engine Serial Numbers 16245, 16256, 16417, 16418, 16584, 16585, 16639, 16640, 16701, 16702, 16813, 16814, 16853, 16854, 16879, 16880, 16898, 16905, 16906, 16911, 16923, 16935 and 16936. Modules M04100AA, M04101AA, M04102AA and M04103AA (Combustion and HP Turbine Module> and Modules M05100AA, M05101AA, M05102AA and M05103AA (LP Turbine Module)
. B. Concurrent Reauirements None. C. Rea son It has become apparent that bolts, which are installed in the Low Pressure <LP) turbine stage 1 static air seal and in the High Pressure (HP) turbine stage 1 air seal support, have not been subject to a complete quality inspection. For this reason, bolts with reduced material propertie s may have been installed. Reduced material properties can result in a release of bolt parts. The release of the bolt parts does not have any effect on the engine function and operation but can cause damage to other engine parts . In order to prevent damage to other engine parts an inspection of these bolts is**recommended~** ... · ··· ·· · ·· · Revision 1 of this Non-Modification Service Bulletin has been issued to change the Compliance category of the Non-Modification Service Bulletin from RECOMMENDED to ALERT. D. Description This N o n-Modification Service Bulletin includes the procedure for the inspection of the bolts which are installed in the LP turbine stage 1 static air seal and of the bolts which are installed in the HP turbine stage 1 air seal support. ! • i

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Dec
. 8/06 

# TAY-72-A1696 1 · 

## 1 ::: ERR Revi s ion 1 © Rolls-Royce Deutschland Ud & Co KG Page 1 of 11
·.; :·.

# \

E. Comoljance 

### ALERT BodyPage<LEFT)

- May 15/09 20002 

# TAY PROPULSION SYSTEM 

## SERVICE BULLETIN ·

This Non-Modification Service Bulletin must be accomplished on engines not later than 5500 cycles since the last engine shop visit completed before 08 Dece11ber 2006.**~_/** 

### / /


## , .

/(**~ ~~-**  

## .?./" "
...**~** F. 

### Aoproval**_.v .:::::Z-C** **-z ~**  C('- 

### The technical content of this document is approved under the authority of EASA Design Organisation Approval No. EASA.21J.065. G. Manpower Estimated Man-hours: (1) In Service Not applicable. <2> At Overhaul/Shop Visit Applicable (Hours not affected). H. Materjal Price and Availability This is a technical document not a quotation; any prices in this Non-Modification Service Bulletin are given in good faith without engagement. The prices listed within the Material Information are at the year of Non-Modification Service Bulletin issue. For availability of spares, contact: Rolls-Royce pte Customer Account Manager Spares Support Group Derby Great Britain I. Tooljng Price and AvajlabilitY New tools are not required
. J. 

### Industry Support Information None.

Dec. 8/06 ERR Revision 1 

# TAY-72-A1696 Page 2 of 11 © Rolls-Royce Deutsc h land Ltd & Co KG : -.· ' 'c 

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# ll

Weight and B alance (1) Weight C hange N

one . (2) Moment Arm No effect
. (3) 

### Datum ES2540 (PPS100)
. Electrical Load D ata 

# TA Y PROPULSION

· SYSTEM 

## S

ERVI C E BULLETI N

The airc r aft electrical load is not affected by this Non-Modification Service Bulletin. M

. Software Accomplishm ent SummarY Not appl icable. N. References 

### <

1 > Engine Manual

- E-TAY-1RR, Chapters 72

- 0Q-41, 72-00-52 , 72-41-20 and 72

- 52

- 10. 0. 

### Other Pu blicat i ons Affec t ed None . P
. I nt erchangeability of Parts

... . .. .. . . No-t

-**~Hected ··**  · . . .... . . .. .. ... ... .. . · • • 0
. .. . • •••• •• •• • 

### · · · ·· · ··· 

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### Dec. 8/06 ERR Revision 1 © Rolls

_ - Royce Deutschland Ud & 

### Co KG

### BodyPage CLEFT)

- May 15/09 20004

2. Ma t eria l Informa tion A. Pa r ts to be Reolaced !PC New Fig/Item Part No . No. 

### 72

- 41

- 21 01-5 3 5 E U

1 0956 01-550 BLT4937 72-52-10 01

- 470 AS2 1 910 01-520 AS21909 B
.**Ex g~** **Ql !:**  

### Pi!f.:U 

# TAY PROPULSION SYSTE M 

## SERVI C E BULLETIN

U

nit P r ice 

### <US Dollar s>

$ 

### 25 .00 

## s 4 3 .00

$ 

### 1 3.5 0 $ 

### 1 2
. 50 Qty 

### Per Eng.
20 24
16 8 

### Key Wo r d

Bolt B

olt
Bo l t Bolt Old Part N

o .
EU 1 0956 BLT 4937
AS2 1 910 AS2 1 909 Instructions/ Dispositions
{1) (1) ( 1 ) ( 1 )
Ref er to the relate d M an ua l tasks given i n the Accomplishment Instruction of t h is Non-Modification Service Bu lletin
. C. I n st ru ction/Disposition Codes 

## • (1) T he replacement of the used part with t he new part is based upon the inspection res u lt w hich has been found ou t dur i ng the inspection instructed i n t h is N on-Modification Service B ulle t in
.

D

ec . 8/06 ERR Revis i on 1 

# TAY-72-A1696 Page 4 of 11 © 

### Rolls-Royce Deutschland ltd & Co 

### KG

### BodyPage(RIGHT)

- May 15/09 20005 

# It TAY PROPULSION SYSTEM 

## SERVICE BULLETIN
3. AccomPlishment Instryctjon A. General (1) Obey all the WARNINGS and CAUTIONS in the procedures that are referred to. (2) Consumable Materials (a) Refer to the related Manual tasks given in this instruction. (3) 

### Tools and Equipment <a> Refer to the related Manual ta sks given in this instruction. 

### B. Remove the Low Pressure 

### CLP) turbine module fro• the engine (Refer to the Engine Manual, Chapter 72-00-52, TASK 72-00-52-000-000). C. Do an inspection of the bolts <72-52-10, 01-470> and (72-52-10, 01-520) which are in stal led in the LP turbine stage 1 static air seal <72-52-10, 01-460) (Refer to Figure 1> <1> Do a visual inspection of the 16 bolts <72-52-10, 01-470) that attach the LP turbine stage 1 static air seal <72-52-10, 01-460> and the diaphragm interstage seal (72-52-10, 01-455) to the 

### LP turbine stage 1 Nozzle Guide Vane <NGV) and air seal support <72-52-10, 01-440) <a> Examine the heads and the visible threads of the bolts <72-52-10, 01-470) for discoloration and oxidation and record the results of the inspection in the Accomplishment Form on page . 11 [1] If there is any bolt (72-52-10, 01-470> found brown or with a rough oxidized surface, replace the 16 bolts <72-52-10, 01-470), P/N 

### AS21910 <Refer to the Engine Manual, Chapter

. . ..**72.~52,1.0,** 

### TASK
.. -72-52-'f.0-000-000· and ·· TASK**~52""'t0•400:.:.0QO> ·**  

### <2> Do a visual inspection of t he eight bolts <72-52-10, 01-520) that attach the air static outer**intersta~e** 

### seal <72-52-10, 01-510> and the air static inner interstage seal <72-52-10, 01-550) to the 

### LP turbine stage 1 static air sea l <72-52-10, 01-460) <a> Examine the heads and the visible threads of the bolts <72 -52-10, 01-520) for discoloration and oxidation and record the result s of the inspection in the Accomplishment Form on page 11 [1] 

### If there is any bolt (72-52-10, 01-520) found brown or with a 

### rough oxidized surface, replace the eight bolts <72-52-10, 01-520>, 

### PIN AS21909 ( Refer to the Engine Manual, Chapter 72-52-10, TASK 72-52-10-000-000 and TASK 72-52-10-400-000). 

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### Dec. 8/06 

# TAY-72-A1696 1 ·: Page 5 of 

### 1 1 

### !::: ERR Revision 1 © Rolls - Royce 

### Deutschland Ltd & Co KG 1 }
_ 

### b :

### BodyPage(LEFT)

- May 15/09 20006 

# TAY PROPULSION SYSTEM 

## SERVICE BULLETIN
D. Remove the combustion and High Pressure (HP) turbine module from the engine <Refer to the Engine Manual, Chapter 72-00-41, TASK**72-00~41-000-000).** 

### E. Do an inspection of the bolts <72-41-21, 01-535> and <72-41-21, 01-550> which are installed in the HP turbine stage 1 air seal support (72-41-21, 01-500) <Refer to Figure 2> (1) Do a visual inspection of the 20 bolts (72-41-21, 01-535> that attach the air seal retainer (72-41-23, 03-750>, the air sealing sleeve ring <72-41-21, 01-530) and the HP turbine stage 1 atr seal support (72-41-21, 01-500> to the HP turbine bearing support assembly <72-41-22, 02-185) (a) Examine the heads and the visible threads of the bolts (72-41-21, 01-535) for discoloration and oxidation and record the results of the inspection in the Accomplishment Form on page 11 (1J If there is any bolt (72-41-21, 01-535) found brown or with a rough oxidized surface, replace the 20 bolts (72-41-21, 01-535>, P/N EU10956 {Refer to the Engine Manual, Chapter 72-41-20, TASK 72-41-20-000-000 and TASK 72-41-20-400-000). <2> Do a visual inspection of the 24 bolts <72-41-21, 01-550) that attach the HP turbine stage 1 air seal (72-41-21,**01~545)** 

### and the HP turbine stage 1 air seal support <72-41-21, 01-500) to the HP turbine bearing support assembly <72-41-22, 02-185> (a) 

### Examine the heads and the visible threads of the bolts (72-41-21, 01-550) for discoloration
. and oxidation and record the results of the inspection in the Accomplishment Form on page 11 [1J If there is any bolt (72-41-21, 01-550) found brown or with a 

### rough oxidized sudace, replace the 24 bolts <72-41-21, 01-550), PIN BLT4937 (Refer to the Engine Manual, Chapter 72-41-20, TASK 72-41-20-000-QOO and TASK 72-41-20-400-000>**~** 

### .. ,

.... .. .... .. .. . . . . .. . ...... . . .... .... . . .. .... . . . ... .. .. . ...... ..... . . . . 

### ··· ··· ····· .. . . . . ..... · ·········· · ..... . . ..... . . · · ········· ·· · 

### F. Ins·tall the combustion and HP turbine module on the engine <Refer to the Engine Manual, Chapter 72-00-41, TASK 72-0.0-41-400-000). G. 

### Install the LP 

### turbtne module on the engine {Refer to the Engine Manual, Chapter 72-00-52, TASK 72-00-52-400-000)
. H. Make sure that the work area is clean and clear of tools, equip!nent and other unwanted materials. I. 

### Complete the Accomplishment Form on page 11 and send it to Rolls-Royce De· utschland, Service Engineering. J. A 

### record of accomplishment is required. Rolls-Royce Deutschland suggests to put an entry into the engine log book.

Dec. 8/06 

# TAY-72-A1696 ERR Revision 1**~** Rolls-Royce**Deutschl~nd** Ltd & Co KG 

### Page 6 of 11c 70 .t:: 

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# . ®**~** 

# TAY PROPULSION SYSTEM 

## S

ERVI C E 

## B ULLETI N

Inspection of the bolts (72-52-10, 01-470) and (72-52

- 10, 01-520> which are installed in the LP turbine stage 1 static air seal <72-52-10, 01-460) Figure 1 <Sheet 1 of. 2> 

## i · l 

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### L Dec. 8/06 

# TAY-72-A1696 1_., Page 7 of 1 1 [- ERR Revision 1 © Rolls -Royce Deutschland Ltd & Co KG**:.**

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- May 15/09 20008 

# TAY PROPULSION 

### · SYSTEM 

## SERVICE BULLETIN

NOTE : SOME DETAILS NOT SHOWN FOR CLARITY

.

01

- 510

NOTE : ALL IPC AG/ITEM

-- NUMBERS ARE 72-52 - 10
. 01-472 (16 off)

# .~ /

01-460

# ~ /
. 01-522 (8 off)

01-440

In s pection of the bolts <72-52-10, 01-470> and (72-52-10, 01-520> which are in s talled in the LP turbine s tage 1 static air seal <72-52-10, 01-460) Figure 1 (Sheet 2 of 2 )
Dec. 8/06 

# TAY-72-A1696 ERR Revision 1 © Rolls- Royce De utschland Ud & Co KG Page 8 of 11c:**~** 

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# ~

# ~ . 

# I

® 

# TAY PROPULSION 

### SYSTEM 

## SERVICE BULLETIN

SECTlON TH ROUG H VEAllCAL CENTER UNE

Inspection of the bolt s <72-41

- 21, 01-535> and <7 2-41-21, 01-550) which are installed in the HP turbine stage 1 air seal sup port <7 2-41-21, 01-500) Figu r e 2 (Sheet 1 of 2> : f I 

# i 

# !' ' 

### I · i Dec. 8 /06 

# TAY-72-A1696 1: · 

### ERR Revision 1 Page 9 of 11 : ·:: © Rolls-Royce Deutschland Ud & Co KG**~~i ~::**  

## ,.,

# i

.a 

### BodyPage(LEFT)

- May 

### 15/09 20010 

# TAY PR OPULS IO N SYSTEM 

## SERVICE BULLETIN

NOTE: SOME DETAILS NOT

-- SHOWN FOR CLARITY
. NOTE: ALL IPC FIG/ITEM

- - NUMBERS ARE 72-41-21 UNLESS 

### IDENTIFIED DrFFERENTL Y
. 01-550 (24 off)

01

- 535



### Inspection of the bolts 

### <72-41-21, 01-535) and 

### (72-41-21, 01-550) which are installed in the HP turbine stage 

### 1 air seal support 

### (72-41-21, 01-500) Figure 2 (Sheet 2 of 2>
Dec. 8/06 

# · TAY-72-A1696 ERR Revision 1 © Rolls - Royce Deutschland Ltd & Co KG 

### Page 

### 10 of 

### 11 ;·.

•· •· 

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## r :BodyPage(RIGHT) - 

### M ay 15/09 20011 

# TAY PROPULSION SYSTEM 

## S

ERVI C E BULLETIN

AIRCRAFT SIN OPERATOR ACCOMPliSHMENT DATE ENGINE SIN TI ME SINCE NEW (TSN) CYCLES SINCE NEW (CSN}
INS P ECTION OF THE 16 BOLTS (72-52-10, 01-470) AtN BOL T HAS B EEN FOUND BROWN? YES 0 

### NOD IF YES, QUANTITY OF BROWN BOLTS: 

## I AtN BOlT HAS BEEN FOUND WITH A ROUGH YES 0 

### NOD OXI DIZED SURFAC E ? IF YES, QUANTTTY OF BOL TS WITH A 

# I ROUG H OXIDIZED SU R FAC E: INSPECTION OF THE EIGHT BOLTS (72-52-10, 01-520) ANY BOL T HAS BEEN FOUND BROWN? YES 

### D NOD IF YES, QUANT1TY OF BROWN BOLTS:**~** AtN BOLT HAS BE E N FOUND WITH A ROUGH YES 0 NO 0 OXIDIZED SURF A

CE? IF YES, QUANTITY OF BOLTS WTTH A 

# I ROUGH OXI DI ZED SURFACE: INS PECTION OF THE 20 BOLTS (72-41-2 1 , 01-535) ANY BO L T HAS BEEN FOUND BROWN? YES 

### D NOD I FYES, OUAN1TTY OF BROWN BOLTS: 

## I ANY BOL T HAS BEEN FOUND WITH A ROUGH YES 

### D NOD OXI DIZED SURFACE? IF YES, QUANTITY OF BOLTS WTTH A 

# I ROUGH OXIDIZED SURFACE: INS PECTION OF THE 24 BOLTS (72-41-21, 01-550)

... 

### .. .... . .. . ..... ···· ··- 

### . . ... 

### ... ······ . . . .. . . . . ........ . .. .. .. . ...... . . 

### . . .. .....
... . .... . . . ... ...... ANY BOLT HAS BEEN F OUND BROWN? YES 0 NO 0 IF YES , QUANTITY OF**EU~OWN** BOLTS : 

## I ANY BOL T HAS BEEN FOUND WITH A ROUG H YES 0 NO 0 OXIDIZED S U RFACE? IF YES, QUANTITY OF BOLTS WTTH A 

# I ROUG H OXIDIZED SURFACE: 

### ..

PLEASE SEN D TH E COMPLETED ACCOMPLISHMENT FO RM TO ROLLS-ROYCE D EUTSCHLAND, SERVICE ENG I NEERI NG, F.AX: + 49 (0) 33 70861212 OR E-MAIL: RR D .SBFEEDBACK@ ROLLS- R OYCE.COM (SUBJ ECT: TAY-72- A1696).

Accomplishment Form


### Dec. 8/06 :-.\ 

# TAY-72-A1696**~--** •••• 11 

### of 11

# ~ ERR Rev i s i on 1 © Rolls-Royce Deutschland Ltd & Co KG**:. :** 

### Rolls-Royce Deutschland Ltd & 

# co KG 

## Service Bulletin Approval Form
Service Bulletin Number TAY-72-A 1696 Revision No. : 1 ENGINE- TURBINE NOZZLE CASE AND**VANES H::-::P~A':"":N~D=-:-L=-** **--­** IN S PE CTIO N O F THE BOLTS WHICH ARE INSTALLED IN THE LPT STAGE 1 STATIC AIR SEAL AND OF THE BOLTS WHI C H ARE IN STALLED IN THE HPT STAGE 1 AIR SEAL SU PPORT - Service Bulletin Title NON-MODIFICATION SERVICE BULLETIN Engine Deslgnatlon(s) _T.;..a;;,;,y(...6.;..1.;..1;...-.;..8

__________________ _ Engine Serial Nos
. affected Refer to paragraph 1
. A. of the Non-Modification Service Bulletin
. Source material used I nformation supplied 

### by EE - 9 (D

. McCaffrey)

. Author Qu a lity Check ( external company only)

Service Bulletin Group Service Engineer Group Leader Service Engineering Chief Service Engineer ( only tor NMS&) Engineering/Specialist (e .g . Screse. Design
. Non-Oealtlle<M! I nspection St>eci olil1 or Clllel) Customer Operat i ons (only If V on- -unlls ore aJfectod or9R700 spares pri= ore**~Sled)** Service Operations On-Wing

. Ser:v

. Jc& Operatk>ne Off-Wing Service Business Team Engine Assembly 

### eve ($8 GrOUP lor 585 / SeMele**Er~~~neemg** tor N!.IS&) Aircraft Manufacturer <or:IY tor F.AR2 5 sec ) Airworthiness Office 

### B. Clarke (Name) 

### S. G riffiths (Name)
Name 

### Approval 24
. 02 .1 2 (Date) 24 .02. 12 (Date) 

# EE-lf3



# -AliA- -J\l {A-

# -AltAService Bulletln Group**~** (S i gna ture)

# ~-**Cu !4** **&** ' (Signa ture)

Date

WP No.: 209246 Tllll Service Bulletin Is approved for pub lication I n aecordanee with VA 1 !Hl1 37
. Technical Lead SBs I Dept: ManagerTDS Nam e: ------------------------------------------ ----------------- Signature :

----------------------- Date:----------
0 ( Rolls

- Royce DeuLSChland 2010) see VAI9.01J7 10003437:2010·1 1 -23 

### : :· L ; . ' I t ·. 

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