An Alenia Aermoct:h i and fADS pi nt ....,lure PROPELL I NG TOMORROW'S WORLD 

# SERVICE BULLETIN ATR42
TRANSMITTAL SHEET Original issue This page transmits Original issue of Service Bulletin No. A TR42-92-0025
. General information concerning this document is available in Service Letter No. A TR42-00-5005. 

### TITLE: Electrical routing - Bonding lead inspection on 120VU

© ATR. All rights reserved
. Confidential and proprietary document. This document shall not be reproduced or disclosed to a third party without the written consent of ATR. This document and its content shall not be used for any purpose other than that for which it is supplied
. ATR , its logo , the distinctive ATR aircraft profiles and patented information relating to the ATR aircraft are the exclusive property of ATR and are subject to copyright. Th i s document and all information contained here i n are the sole property of ATR. No intellectual property right is granted through , or induced by , the del i very of this document or the d i sclosure of its content.

Original issue - Nov 07/13 Service Bulletin No. A TR42-92-0025 Page TS-1 of TS-2SERVICE BULLETIN ATR42

1 - TABLE OF CONTENTS TRANSMITTAL SHEET
. . . .. ..... . ...... . . ...... .. ... ... ..... . ....... . .. . . . .. ......... . .. . . ............ ... Page TS-1 to TS-2 ACCOMPLISHMENT REPORT
. ...... ......... ................... . . . .................... . .. . ..... .. . Page AR-1 to AR-2 PLANNING INFORMATION
. ..... .. . . .. . ... .. .... .. ....... .. .. ... .. . . .. . .. . .... .. .. ... . .. .. .. .... .. . . ... . . Page Pl-1 to Pl-4 MATERIAL INFORMATION
.. .... .. ... . . . . .. . ................... .... . . ....... .. ........ . . ............ . .. . Page Ml-1 to Ml-2 ACCOMPLISHMENT INSTRUCTIONS
..... ... .. . . ..... .... . . .. .... .... .. . ... .. ... ................. Page Al-1 to Al-3 ILLUSTRATIONS
. ...... .. .. . .. .. . .. .. . ... .. . . . . ... .. .. . .... . . . ........ .. .. . . . . ... ... .. ... . . .................... . Page IL-1 to IL-2 2 - REVISION SEQUENCES Issue or Revision Date Additional work Original issue Nov 07/13


### -

Original i ssue - Nov 07/13 Service Bulletin No
. A TR42-92-0025 Page TS-2 of TS-2 © A TR All rights reserved
. Confidential and proprietary document.An Alen i a Aermacch i and fADS joi nt 1<!111tJre PROPELL ING TOMORROW ' S WORLD

Send this report to:

Aircraft identification 

# SERVICE BULLETIN ATR42
ACCOMPLISHMENT REPORT SERVICE BULLETIN No. ATR42-92-0025 Original issue

ATR ENGINEERING SERVICE BULLETIN GROUP 1 ALLEE PIERRE NADOT 31712 BLAGNAC CEDEX FRANCE phone : +33 (0)5 62 21 62 21 fax : +33 (0)5 62 21 69 41 e-mail : techdesk@atr.fr

Service Bulletin accomplished on aircraft MSN : Service Bulletin accomplishment date : Aircraft registration number : Number of flights : Flight hours :

Original issue- Nov 07/13 Service Bulletin No
. ATR42-92-0025 Page AR-1 © A TR. All rig h ts reserved
. Confidentia l and p r oprietary document.SERVICE BULLETIN ATR42 Inspection results Tick ( / ) the appropriate box Aircraft skin side Aisle side On which side the bonding lead of the 120VU fitting is installed 

### ? 

# D D
NOTE : Provide a picture in case of incorrect position of the bonding lead. Remarks:

Maintenance organisation identification Maintenance organisation name: Name & Signature: Date :

Original issue - Nov 07/13 Service Bulletin No
. ATR42-92-0025 Page AR-2 © ATR. All rights reserved
. Confidential and proprietary document.An Aleni a Aermac:chi and EADS jainl-.enlure PROPELL ING TOMORROW ' S WORLD 

# SERVICE BULLETIN ATR42
COMPLIANCE : RECOMMENDED INSPECTION: 014/2013 

### TITLE: Electrical routing - Bonding lead inspection on 120VU 1. PLANNING INFORMATION 

### A. EFFECTIVITY (1) Aircraft models ATR42-200 ATR42-300 ATR42-320 ATR42-400 ATR42-500 NO NO NO NO YES (2) Aircraft MSN Kit(s) S920025 669 , 671 , 673 , 675 , 689 , 691 , 693 , 695 , 800, 801 , 802 , 803 , 804 , 807 , 815 , 819 , 823 , 827 , A01 831,835 , 839 , 844 , 849 , 854 , 859 , 1001 , 1002 , 1003 , 1004 , 1005 For each aircraft MSN , operator should order the ment1oned k1t(s)
. Other parts or equipment could be required for embodiment of this Service Bulletin
. Please refer to chapter "MATERIAL INFORMATION" for details. (3) Spares The following stock items are modifiable (o r not) according to the table below. None
.

Original issue- Nov 07/13 Service Bulletin No
. ATR42-92-0025 Page Pl - 1 © A TR
. All rights reserved
. Confidential and proprietary document.SERVICE BULLETIN ATR42
B. REASON It has been reported some cases of chafing between the bonding lead on 120VU and the existing wiring located in this zone, due to an incorrect bonding lead installation
. This Service Bulletin provides instructions to inspect the bonding lead routing on the top of 120VU and to modify it if necessary . COMPLIANCE : Accomplishment of this Service Bulletin is recommended by ATR. C. DESCRIPTION Accomplishment of this Service Bulletin consists in carrying out the following jobs : (1) In zone 214, on top of 120VU, on 120VU fitting , inspection of bonding lead position According to inspection results : (2) In zone 214 , on top of 120VU , on 120VU fitting , installation of bonding lead in correct position D
. APPROVAL The technical content of this document is approved under the authority of DOA No
. EASA.21J
. 044. E
. MANPOWER (1) Valid only for inspection Man hours Mechanic None Electrician 1 Total manhours 1 Elapsed time (hours) 1 The above estimates are only provided for general guidance in operator's modification planning
.
Or i ginal issue - Nov 07/13 Service Bulletin No. ATR42-92-0025 Page Pl-2 © A TR
. All rights reserved
. Confidential and proprietary document.

# All SERVICE BULLETIN ATR42 NOTE: This Service Bulletin assumes that the aircraft has been placed in the appropriate maintenance configuration
. The manhours/elapsed time estimates do not include preparation for the inspection , non-productive elapsed time or administrative functions. (2) Valid only for modification Manhours Mechanic None Electrician 1 Total manhours 

### 1 Elapsed time (hours) 

### 1 The above estimates are only provided for general guidance in operator's modification planning. NOTE: This Service Bulletin assumes that the aircraft has been placed in the appropriate maintenance configuration. The manhours/elapsed time estimates do not include preparation for the modification, non-productive elapsed time or administrative functions
. F. WEIGHT AND BALANCE None
. G. REFERENCES The following publications have to be used during accomplishment of this Service Bulletin: AMM 06-41-20 20-41-11 AMM (JIC) : 24-40-00 EAD 10000 SRM : 51-35 - 00

Original issue - Nov 07/13 Service Bulletin No. A TR42-92-0025 Page Pl-3 © A TR. All rights reserved
. Confidential and proprietary document.

### SERVICE BULLETIN ATR42
H. AFFECTED PUBLICATIONS (1) Maintenance documentation None
. (2) Operational documentation None
.

Original issue - Nov 07/13 Service Bulletin No. ATR42-92-0025 Page Pl-4 © ATR
. All rights reserved
. Confidential and proprietary document.SERVICE BULLETIN ATR42


### 2. MATERIAL INFORMATION A. MATERIAL- COST AND AVAILABILITY (1) Kits Kits cost and availability, or any further commercial information about Service Bulletin , may be consulted through A TRactive or operator should contact ATR at the following addresses : www.atractive.com ATR CUSTOMER SERVICES SPARES SUPPORT 1 ALLEE PIERRE NADOT 31712 BLAGNAC CEDEX FRANCE phone: +33 (0)5 62 21 66 99 fax : +33 (0)5 62 21 61 12 e-mail : kits@atr.fr Or operator should contact the ATR center it is related to, according to its operational area, at the following addresses: ATR NORTH AMERICA 45195 BUSINESS COURT, SUITE 450 DULLES, VIRGINIA 20166 USA phone : +1 571 203 6920 fax : +1 571 203 6903 e-mail : commercialservices@atrnorthamerica.com ATR EASTERN SUPPORT Pte Ltd
. 51 CHANGI BUSINESS PARK CENTRAL 2 #08-02 THE SIGNATURE SINGAPORE 486066 phone : +65 6542 0122 fax : +65 6542 1 04 7 e-mail : commercial.services@atr.com
. sg Operator should place a pu r chase order specifying concerned MSN , Service Bulletin reference and kits reference (according to paragraph 1
. A.) through A TRactive or to the A TR center it is related to according to its operational area.
Original issue - Nov 07/13 Service Bulletin No. ATR42 - 92-0025 Page Ml-1 © A TR. All rights reserved
. Confidential and proprietary document
.

# All SERVICE BULLETIN ATR42 B. LIST OF COMPONENTS Item Part Number Qty Description Kit S920025A01 5 ABS0114V3-4 2 Screw 6 AN960PD10L 2 Washer
C. LIST OF MATERIALS- OPERATOR SUPPLIED Item Description Reference Qty per SRM 51-35-00 aircraft



### - Varnish 07-001 As required NOTE : The above materials can be procured by means of a spares purchase order
. D
. SPECIAL TOOLS Accomplishment of this Service Bulletin requires use of the following special tools: None.

Original issue - Nov 07/13 Service Bulletin No. ATR42-92-0025 Page Ml-2 © ATR
. All rights reserved
. Confidential and p r oprietary document.SERVICE BULLETIN ATR42


### 3. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL The following instructions assume that work will be accomplished when the aircraft is in the appropriate maintenance configuration. B. JOB SET-UP (1) De-energize the aircraft electrical network and connect the aircraft to ground as per AMM (JIC) 24-40-00 EAD 10000
. (2) On 120VU, remove lining panei214BC as per AMM 06-41-20. C
. INSPECTION NOTE: During accomplishment of this Service Bulletin , fill the enclosed Accomplishment Report and send it to the address mentioned on the Accomplishment Report. (1) In zone 214, on top of 120VU , on 120VU fitting , inspection of bonding lead position As per Figure 1 (a) If the lower part of the bonding lead is positioned on the aircraft skin side , perform paragraph 3
. F. (b) If the lower part of the bonding lead is positioned on the aisle side , perform paragraph 3
. D.

Original issue - Nov 07/13 Service Bulletin No. ATR42-92-0025 Page Al-1 © ATR
. All rights reserved
. Confidential and proprietary document.SERVICE BULLETIN ATR42
D. MODIFICATION (1) In zone 214, on top of 120VU, on 120VU fitting, installation of bonding lead in correct position (a) Remove all the parts listed in the following table. Carefully follow the specific instruction(s) detailed after the table. REMOVAL 

# I Item

1 2 9 3 4

Item

9 5 6 Description Part Number Qty Qty Figure Discarded Re-used Screw


### - 1


### - 2 Washer


### - 1 

### - 2 Bonding lead


### - - 1 2 Screw


### - 1

- 2 Washer


### - 1 

### - 2 Specific instruction(s): Only the lower part of bonding lead item 9 is removed
. (b) Install all the parts listed in the following table. Carefully follow the specific instruction(s) detailed after the table
. INSTALLATION Description Part Number Qty Qty from Figure New Removal Bonding lead


### - - 1 2 Screw ABS0114V3-4 2 

### - 2 Washer AN960PD10L 2 

### - 2

Original issue - Nov 07/13 Service Bulletin No. A TR42-92-0025 Page Al-2 © ATR
. All rights reserved
. Confidential and proprietary document.E
. TESTS SERVICE BULLETIN ATR42 Specific instruction(s) :

- Only the lower part of bonding lead item 9 is installed.

- Perform electrical bonding at level of fasteners items 5 and 6 as per

AMM 20-41-11
.

- Protect with varnish Material No. 07-001 (Refer to SRM 51-35-00). CAUTION: ELECTRICAL TEST CONTINUITY (REFER TO PARAGRAPH 3
. E
. ) CAN BE PERFORMED BEFORE OR AFTER PROTECTIVE VARNISH INSULATION
. WHEN IT'S PERFORMED AFTER PROTECTIVE VARNISH INSULATION , PERFORM A PROTECTIVE VARNISH TOUCH-UP.

CAUTION: USE A MILLIOHMMETER WITH A CURRENT GAGE OF 10A DURING THE FOLLOWING TESTS. (1) Perform a test of electrical continuity between fasteners items 5 , 6 and aircraft main structure near the test point. If measured value is more than 1 milliohm , perform an electrical bonding as per AMM 20-41-11 on defectuous point. F. CLOSE-UP (1) Clean working area. (2) On 120VU , re-install lining panei214BC as per AMM 06-41 - 20
. (3) Re-energize the aircraft electrical network and disconnect aircraft from ground as per AMM (JIG) 24-40-00 EAD 10000
.

Or i ginal issue - Nov 07/13 Serv i ce Bulletin No
. ATR42-92-0025 Page Al-3 © ATR. All rights reserved
. Confidential and proprietary document........__All:•::;...SERVICEBULLETINATR42FR13cInzone214,ontopof120VU,on120VUfitting,inspectionofbondingleadpositionFigure1DETAILBINCORRECTPOSITION@]INCORRECTPOSITIONc;+-d.-,Originalissue-Nov07/13ServiceBulletinNo.ATR42-92-0025PageIL-11!:1ATR.Anrightsresarvad.ConfidentialandproprielefYdocumentDETAILBCORRECTPOSITION@]CORRECTPOSITIONc;+---""'-,_,--.........,...-...,,...All:-.;GSERVICEBULLETINATR42Inzone214,ontopof120VU,on120VUfitting,installationofbondingleadincorrectpositionFigure2Originalissue-Nov07/13ServiceBulletinNo.ATR42-92-0025PageIL-2CATR.AUrightsreserved.ConftdenbalandPfOprietarydocumentDETAILBBEFOREOETAJLBAFTERAIRCRAFTSKINSIDE9-...._56"'-{,AISLESIDE¢c5,/6@]AFTER