# SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page TS-1 of TS-1

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France 

### TRANSMITTAL SHEET
Original issue

This page transmits Original issue of Service Bulletin No. ATR72-55-1006.
General information concerning this document is available in Service Letter No. ATR72-00-6005.



### TITLE : Stabilizers - LH and RH elevators - Inboard hinge fittings - Inspection of lower stop fitting angles

1 – TABLE OF CONTENTS
TRANSMITTAL SHEET ...................................................................................Page TS-1 to TS-1
ACCOMPLISHMENT REPORT ...................................................................... Page AR-1 to AR-2
PLANNING INFORMATION............................................................................... Page PI-1 to PI-5
MATERIAL INFORMATION.............................................................................. Page MI-1 to MI-2
ACCOMPLISHMENT INSTRUCTIONS ............................................................. Page AI-1 to AI-7
ILLUSTRATIONS................................................................................................ Page IL-1 to IL-2

2 – REVISION SEQUENCES

Issue or Revision Date Additional work

Original issue May 11/10 -

# SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page AR-1

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France 

### ACCOMPLISHMENT REPORT
SERVICE BULLETIN No. ATR72-55-1006 Original issue

Send this report to:

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

Aircraft identification
Service Bulletin accomplished on aircraft MSN:
Service Bulletin accomplishment date:
Aircraft registration number:
Number of flights:
Flight hours:SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page AR-2

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France Inspection results

Tick ( 3 ) the appropriate box

Item 1 Item 2 Remarks
Which damaged angles have you found on the LH side elevator?
Which damaged angles have you found on the RH side elevator?

Performed actions

Maintenance organisation identification
Maintenance organisation name:
Name & Signature:

Date:

# SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page PI-1

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France COMPLIANCE : MANDATORY INSPECTION: 002/2010



### TITLE : Stabilizers - LH and RH elevators - Inboard hinge fittings - Inspection of lower stop fitting angles

1. PLANNING INFORMATION

A. EFFECTIVITY
(1) Aircraft models

ATR72-101 ATR72-102 ATR72-201 ATR72-202 ATR72-211 ATR72-212 ATR72-212A

YES YES YES YES YES YES YES

(2) Aircraft

MSN Kit(s)

108, 126, 140, 145, 147, 150, 154, 157, 162, 164, 167, 171, 174, 177, 180, 183, 186, 189, 192, 195, 198, 201, 204, 207, 210, 212, 215, 217, 220, 222, 224, 227, 229, 232, 234, 237, 239, 241, 244, 246, 248, 251, 253, 256, 260, 263, 265, 267, 270, 272, 274, 276, 279, 281, 283, 285, 288, 290, 292, 294, 297, 299, 301, 303, 305, 307, 309, 311, 313, 316, 320, 324, 326, 328, 330, 332, 334, 336, 338, 339, 341, 342, 344, 345, 347, 349, 350, 352, 353, 355, 357, 359, 361, 362, 364, 365, 367, 369, 370, 372, 373, 375, 377, 379, 381, 383, 385, 387, 389, 391, 393, 395, 396, 398, 399, 402, 404, 405, 407, 408, 410, 411, 413, 414, 416, 417, 419, 420, 422, 423, 425, 426, 428, 429, 431, 432, 434, 437, 440, 441, 444, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 459, NoneSERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page PI-2

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France MSN (continued) Kit(s)

460, 461, 463, 464, 465, 467, 468, 469, 470, 472, 473, 475, 477, 478, 479, 481, 482, 483, 485, 486, 488, 489, 493, 494, 496, 498, 499, 508, 509, 517, 519, 521, 523, 525, 527, 529, 531, 533, 535, 536, 538, 540, 541, 543, 545, 547, 548, 550, 552, 553, 555, 557, 558, 560, 562, 563, 565, 567, 568, 570, 572, 573, 575, 577, 578, 580, 582, 583, 585, 587, 588, 590, 592, 593, 595, 597, 598, 600, 624, 626, 628, 630, 632, 634, 636, 638, 642, 644, 646, 648, 650, 652, 654, 656, 658, 660, 662, 664, 666, 668, 672, 674, 676, 677, 678, 679, 680, 681, 682, 683, 684, 685, 686, 687, 688, 690, 692, 694, 696, 697, 698, 699, 700, 701, 702, 703, 704, 705, 706, 707, 708, 709, 710, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 722, 723, 724, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736, 737, 738, 739, 740, 741, 742, 743, 744, 745, 746, 747, 748, 749, 750, 751, 752, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770, 771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785, 786, 787, 788, 789, 790, 791, 792, 793, 794, 795, 796, 797, 798, 799, 805, 806, 808, 809, 810, 812, 813, 814, 816, 817, 818, 820, 821, 822, 824, 825, 828, 829, 830, 832, 833, 834, 836, 837, 838, 840, 841, 842, 843, 845, 846, 847, 848, 850, 851, 852, 853, 855, 856, 857, 858, 860, 861, 862, 863, 864, 865, 866, 867, 868, 869, 870, 872, 873, 874, 875, 876, 877, 878, 879, 880, 881, 882, 883, 884, 885, 886, 887, 888, 889, 890, 891, 892, 893, 894, 895, 896, 897, 899, 900, 901, 902, 903, 904, 906, 909, 910 None

(3) Spares
The following stock items are modifiable (or not) according to the table below.

None.SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page PI-3

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France B. REASON
At level of LH and RH side elevator front spars, some inner and/or outer angles of the lower stop fitting installed on inboard hinge fittings have been found cracked on several aircraft.
This Service Bulletin consists in inspecting these angles and in replacing them if necessary.

COMPLIANCE : Accomplishment of this Service Bulletin is mandatory. An Airworthiness Directive will be issued by EASA.

C. DESCRIPTION
Accomplishment of this Service Bulletin consists in carrying out the following jobs:
(1) In zones 334 and 344, general visual inspection
(2) In zones 334 and 344, detailed visual inspection of lower stop angles of inboard hinge
According to inspection results:
(3) In zones 334 and/or 344, removal of the concerned elevator(s)
(4) On the bench, on the LH elevator, replacement of the damaged angle(s)
(5) On the bench, on the RH elevator, replacement of the damaged angle(s)
(6) In zones 334 and/or 344, re-installation of the removed elevator(s)

D. APPROVAL
The technical content of this document is approved in accordance with CE 1702/2003 regulation and is rendered mandator y by an EASA Airworthiness Directive.SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page PI-4

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France E. MANPOWER
(1) Valid for aircraft on which there is no angle replaced

Manhours
Mechanic 4
Electrician None

Total manhours 4 Elapsed time (hours) 2

(2) Valid for aircraft on which there are four angles replaced

Manhours
Mechanic 60
Electrician None

Total manhours 60 Elapsed time (hours) 30

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 inspection, non-productive elapsed time or administrative functions.

F. WEIGHT AND BALANCE

None.SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page PI-5

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France G. REFERENCES
The following publications have to be used during accomplishment of this Service Bulletin:

AMM : 06-41-30
AMM (JIC) : 24-40-00 EAD 10000 55-20-00 RAI 10000

NDTM : 51-90-00

SRM : 51-22-03 51-35-00

H. AFFECTED PUBLICATIONS
The following publications will be updated after receipt of the Accomplishment Report by ATR.

None.SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page MI-1

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France 2. MATERIAL INFORMATION

A. MATERIAL - COST AND AVAILABILITY
(1) Material
Parts cost and availability, or any further commercial information about Service Bulletin, may be consulted through ATRactive 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 60 33 fax : +33 (0)5 62 21 62 80 e-mail : spares.quotations@atr.fr
Or operator should contact the ATR center he is related to, according to his 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. 77 LOYANG WAY SINGAPORE 508765 phone : +65 6542 0122 fax : +65 6542 1047
Operator should place his purchase order specifying parts reference through ATRactive or to the ATR center he is related to according to his operational area.SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page MI-2

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France B. LIST OF COMPONENTS

Item Part Number Qty Description

Material

1 S5527200021401 2 Angle 2 S5527200021201 2 Angle 5 S5527200021000 2 Shim 10 NTA12250-5DD12 4 Rivet 11 NTA12250-4DD12 4 Rivet 15 MS21074L3 4 Nut 16 NTA12350-3A3 8 Rivet

NOTE : These quantities are maximum and are presented for the replacement of the four angles.

C. LIST OF MATERIALS - OPERATOR SUPPLIED

Item Description Reference SRM 51-35-00 Qty per aircraft

Polysulfide sealant 09-001F As required Alodine 13-002 As required Primer 16-001C 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.SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page AI-1

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France 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) Display warning notice in flight compartment prohibiting operation of elevator control.
(3) In zones 334 and 344, remove access panels 333CB and 343CB (Refer to AMM 06-41-30).
(4) Maintain elevators in full nose up position (trailing edge upward).

C. INSPECTION
(1) In zones 334 and 344, general visual inspection
Perform a general visual inspection on inboard hinge fitting area at level of LH and RH elevator front spars as per NDTM 51-90-00.
In case of findings, contact ATR for approved solution to:

ATR ENGINEERING STRUCTURE DEPARTMENT phone : +33 (0)5 62 21 65 61 fax : +33 (0)5 62 21 62 92 e-mail : techdesk@atr.fr
(2) In zones 334 and 344, detailed visual inspection of lower stop angles of inboard hinge fittings
As per Figure 1
Position a mirror behind lower stops installation and perform a detail visual inspection of lower stop angles Item 1 and Item 2 as per NDTM 51-90-00.
Pay a particular attention to check absence of cracks in radius.SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page AI-2

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France If there is no damage, perform Para 3.F.
In case of damage perform Para. 3.D., 3.E. and 3.F. Para. 3.D.(2) has to be performed in case of damage detected on LH elevator angle(s). Para. 3.D.(3) has to be performed in case of damage detected on RH elevator angle(s).

D. MODIFICATION
(1) In zones 334 and/or 344, removal of the concerned elevator(s)
Remove the concerned elevator(s) as per AMM (JIC) 55-20-00 RAI 10000.
(2) On the bench, on the LH elevator, replacement of the damaged angle(s)
(a) Removal of the stop
Remove all the parts listed in the following table.

REMOVAL

Item Description Part Number Qty Discarded Qty Re-used Figure

3 Screw NAS1802-3-10 - 2 1 4 Stop S5527200020000 - 1 1
5 Shim S5527200021000 1 - 1

(b) Removal of the damaged angle(s)
As per Figure 1, sheets 1 and 2
Remove the damaged angle Item 1, P/N S5527200021400 and/or angle Item 2, P/N S5527200021200 with rivet Item 10, P/N NTA12250-5DD (Qty 1 per angle) and rivet Item 11, P/N NTA12250-4DD (Qty 1 per angle).SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page AI-3

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France (c) Perform a detail visual inspection of adjacent areas.
In case of findings, contact ATR for approved solution to:

ATR ENGINEERING STRUCTURE DEPARTMENT phone : +33 (0)5 62 21 65 61 fax : +33 (0)5 62 21 62 92 e-mail : techdesk@atr.fr
(d) Installation of the new angle(s)
As per Figure 1, sheets 1 and 2

1 Put in position the new shim Item 5, P/N S5527200021000 on the stop Item 4, P/N S5527200020000 retained at removal Para. 3.D.(2)(a). Be careful to position the laminated portion of the shim Item 5 in contact with the stop Item 4.

2 Install the stop/shim assembly on the hinge fitting Item 20. Take care to ensure flat contact between hinge fitting Item 20 and shim Item 5. Respect a gap of 0.3 mm ± 0.2 mm (0.0118 in ± 0.0078 in) between the stop/shim assembly and the elevator front spar horizontal flange.

3 Put and maintain in position the stop/shim assembly on the hinge fitting Item 20.

4 Put and maintain in position the new angle(s) Item 1, P/N S5527200021401 and/or Item 2, P/N S5527200021201 in contact with the hinge fitting Item 20 and the shim Item 5.

5 Drill hole(s) A between 4.826 mm and 4.928 mm (0.190 in and 0.194 in). Remove stop/shim assembly and the angle(s). Protect hole(s) A with Alodine Material No. 13-002 and Primer Material No. 16-001C (Refer to SRM 51-35-00).

6 Install new nut Item 15, P/N MS21074L3 (Qty 1 per angle), attach with rivet Item 16, P/N NTA12350-3A3 (Qty 2 per nut).

7 As per Figure 1, sheet 2, section H-H (schematic for flat contact checking) put in position the angle(s) on the hinge fitting flanges Item 20. Using the stop Item 4, check the correct alignment between angles Items 1 and 2 and the hinge fitting flanges Item 20. The flange of angles does not protrude from hinge flanges.SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page AI-4

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France 8 Install new angle Item 1, P/N S5527200021401 and/or new angle Item 2, P/N S5527200021201, attach with rivet Item 10, P/N NTA12250-5DD12 (Qty 1 per angle) and rivet Item 11, P/N NTA12250-4DD12 (Qty 1 per angle).

9 Install new shim Item 5, P/N S5527200021000 and stop Item 4, P/N S5527200020000 (retained at removal Para. 3.D.(2)(a)), attach with 2 screws Item 3, P/N NAS1802-3-10 (retained at removal Para. 3.D.(2)(a)). Be careful to position the laminated portion of the shim Item 5 in contact with the stop Item 4. Tighten Item 3 at 3 N.m to 3.5 N.m (26.552 in.lbf to 30.978 in.lbf).
(3) On the bench, on the RH elevator, replacement of the damaged angle(s)
(a) Removal of the stop
Remove all the parts listed in the following table.

REMOVAL

Item Description Part Number Qty Discarded Qty Re-used Figure

3 Screw NAS1802-3-10 - 2 1 4 Stop S5527200020000 - 1 1
5 Shim S5527200021000 1 - 1

(b) Removal of the damaged angle(s)
As per Figure 1, sheets 1 and 2

1 If the replacement of angle Item 2 is necessary, remove and retain the nut Item 6, the screw Item 7 and the washers Items 8 and 9 in order to disconnect the two bonding leads.

2 Remove the damaged angle Item 1, P/N S5527200021400 and/or angle Item 2, P/N S5527200021200 with rivet Item 10, P/N NTA12250-5DD (Qty 1 per angle) and rivet Item 11, P/N NTA12250-4DD (Qty 1 per angle).SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page AI-5

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France (c) Perform a detail visual inspection of adjacent areas.
In case of findings, contact ATR for approved solution to:

ATR ENGINEERING STRUCTURE DEPARTMENT phone : +33 (0)5 62 21 65 61 fax : +33 (0)5 62 21 62 92 e-mail : techdesk@atr.fr
(d) Installation of the new angle(s)
As per Figure 1, sheets 1 and 2

1 Put in position the new shim Item 5, P/N S5527200021000 on the stop Item 4, P/N S5527200020000 retained at removal Para. 3.D.(3)(a). Be careful to position the laminated portion of the shim Item 5 in contact with the stop Item 4.

2 Install the stop/shim assembly on the hinge fitting Item 20. Take care to ensure flat contact between hinge fitting Item 20 and shim Item 5. Respect a gap of 0.3 mm ± 0.2 mm (0.0118 in ± 0.0078 in) between the stop/shim assembly and the elevator front spar horizontal flange.

3 Put and maintain in position the stop/shim assembly on the hinge fitting Item 20.

4 Put and maintain in position the new angle(s) Item 1, P/N S5527200021401 and/or Item 2, P/N S5527200021201 in contact with the hinge fitting Item 20 and the shim Item 5.

5 Drill hole(s) A and B between 4.826 mm and 4.928 mm (0.190 in and 0.194 in). Remove stop/shim assembly and the angle(s). Protect hole(s) A with Alodine Material No. 13-002 and Primer Material No. 16-001C (Refer to SRM 51-35-00).

6 If angle Item 2 must be replaced, perform an electrical bonding at level of hole B on each side of the angle (see detail G, Figure 1) as per SRM 51-22-03.

7 Install new nut Item 15, P/N MS21074L3 (Qty 1 per angle), attach with rivet Item 16, P/N NTA12350-3A3 (Qty 2 per nut).SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page AI-6

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France 8 As per Figure 1, sheet 2, section H-H (schematic for flat contact checking) put in position the angle(s) on the hinge fitting flanges Item 20. Using the stop Item 4, check the correct alignment between angles Items 1 and 2 and the hinge fitting flanges Item 20. The flange of angles does not protrude from hinge flanges.

9 Install new angle Item 1, P/N S5527200021401 and/or new angle Item 2, P/N S5527200021201, attach with rivet Item 10, P/N NTA12250-5DD12 (Qty 1 per angle) and rivet Item 11, P/N NTA12250-4DD12 (Qty 1 per angle).

10 Install new shim Item 5, P/N S5527200021000 and stop Item 4, P/N S5527200020000 (retained at removal Para. 3.D.(3)(a)), attach with 2 screws Item 3, P/N NAS1802-3-10 (retained at removal Para. 3.D.(3)(a)). Be careful to position the laminated portion of the shim Item 5 in contact with the stop Item 4. Tighten Item 3 at 3 N.m to 3.5 N.m (26.552 in.lbf to 30.978 in.lbf).

11 If the angle Item 2 has been removed at Para. 3.D.(3)(b) and replaced, re-install, as per Figure 1 Detail G, the two bonding leads and attach them with the nut Item 6, the screw Item 7 and the washers Items 8 and 9 retained at Para. 3.D.(3)(b). Tighten the nut Item 6 at 2 N.m ± 0.2 N.m (17.701 in.lbf ± 1.770 in.lbf). Protect bonding lead terminals and associated fasteners with polysulfide sealant Material No. 09-001F (Refer to SRM 51-35-00).
(4) In zones 334 and/or 344, re-installation of the removed elevator(s)
Re-install the removed elevator(s) as per AMM (JIC) 55-20-00 RAI 10000.

E. TESTS
Verify that tests required by maintenance documents (AMM (JIC) 55-20-00 RAI 10000) mentioned on previous paragraph "MODIFICATION" have been performed.

F. CLOSE-UP
(1) In zones 334 and 344, install access panels 333CB and 343CB (Refer to AMM 06-41-30).
(2) Remove warning notice in flight compartment prohibiting operation of elevator control.SERVICE BULLETIN ATR72

Original issue - May 11/10 Service Bulletin No. ATR72-55-1006
Page AI-7

© Copyright 2010 Avions de Transport Régional - ATR - All rights reserved. Printed in France (3) Re-energize the aircraft electrical network and disconnect the aircraft from ground as per AMM (JIC) 24-40-00 EAD 10000.
(4) Fill the enclosed Accomplishment Report and send it to the address mentioned on the Accomplishment Report.SERVICE BULLETIN ATR72Original issue - May 11/10 Service Bulletin No. ATR72-55-1006Page IL-1©Copyright 2010 Avions de Transport Régional - ATR - All rights reserved.Printed in FranceILLUSTRATIONSInspection and removal/installation of anglesFigure 1, sheet 1 of 2SERVICE BULLETIN ATR72Original issue - May 11/10 Service Bulletin No. ATR72-55-1006Page IL-2©Copyright 2010 Avions de Transport Régional - ATR - All rights reserved.Printed in FranceInspection and removal/installation of anglesFigure 1, sheet 2