An Alenia Aermoct:hi and fADS pint ....,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. This document and all information contained herein are the sole 

property of ATR. No intellectual property right is granted through , or induced by, 

the delivery of this document or the disclosure of its content. 

Original issue - Nov 07/13 Service Bulletin No. A TR42-92-0025 

Page TS-1 of TS-2 
SERVICE 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 issue - 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 Alenia Aermacchi and fADS joint 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 rights reserved. Confidential and proprietary 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 Alenia 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 (or 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. 

Original 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 purchase 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 proprietary 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. 

Original issue - Nov 07/13 Service Bulletin No. ATR42-92-0025 

Page Al-3 © ATR. All rights reserved . Confidential and proprietary document. 
....... __ All 

:•::; .. . SERVICE BU LLETIN ATR42 

FR 13 

c 

In zone 214, on top of 120VU, on 120VU fitting, 

inspection of bonding lead position 

Figure 1 

DETAIL B 

INCORRECT POSITION 

@] 

INCORRECT POSITION 

c;+ -d. -, 

Original issue- Nov 07/13 Service Bulletin No. A TR42-92-0025 

Page IL-1 

1!:1 ATR . An rights resarvad. Confidential and proprielefY document 

DETAI L B 

CORRECT POSIT

@] 

CORRECT POSI

c;+ ---""' -, 

_, --
.... ..... ,...-... ,, ... All 

:-.;G SERVICE BULLETIN ATR42 

In zone 214, on top of 120VU, on 120VU fitting, 

installation of bonding lead in correct position 

Figure 2 

Original issue- Nov 07/13 Service Bulletin No. ATR42-92-0025 

Page IL-2 

C ATR . AU rights reserved. Conftdenbal and PfOprietary document 

DETAILB 

BEFORE 

OETAJLB 

AFTER 

AIRCRAFT SKIN 

SIDE 

9-...._ 

5 6"'-{, 

AISLE 

¢

5 

, / 6 

@] 

AFTER