631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 1 of 10 ATR 42 MAIN LANDING GEAR HINGE PINS INSPECTION

1. PLANNING INFORMATION.

A. Effectivity.

(1) In-service aircraft affected.

ATR 42 all types.

(2) In-service and spare components affected.

ATR 42: Pins D56800, D56809, D57261, and D62079.

ATR 42-300: Pins D56841, D57401, D57407 and D56807.

ATR 42-500: Pins D62054, D63823 and D63825.

Listed in the following tables.631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 2 of 10 ATR 42

NOTE: Pins already inspected in the frame of SB 631-32-22 0 do not need to be re-inspected. PIN D56800 S/N



### MN60 MN548 MN583 MN619 MN655 

### MN384 MN549 MN584 MN620 MN656 

### MN386 MN550 MN585 MN621 MN657 

### MN394 MN551 MN586 MN622 MN658 

### MN397 MN552 MN587 MN623 MN659 

### MN400 MN553 MN588 MN624 MN660 

### MN401 MN554 MN589 MN625 MN661 

### MN402 MN555 MN590 626 MN662 

### MN403 MN556 MN591 MN627 MN663 

### MN405 MN557 MN592 MN628 MN664
MN478 MN558 MN593 MN629 MN665
MN479 MN559 MN594 MN630 MN666
MN524 MN560 MN595 MN631 MN667
MN525 MN561 MN596 MN632 MN668
MN526 MN562 MN597 MN633 MN669
MN527 MN563 MN598 MN634 MN670
MN528 MN564 MN599 MN635 MN671
MN529 MN565 MN600 MN636 MN672
MN530 566 MN601 MN637 MN673
MN531 MN566 MN602 MN638 MN674
MN532 MN567 MN603 MN639 MN675
MN533 MN568 MN604 MN640 MN676
MN534 MN569 MN605 MN641 MN677
MN535 MN570 MN606 MN642 MN678
MN536 MN571 MN607 MN643 MN679
MN537 MN572 MN608 MN644 MN680
MN538 MN573 MN609 MN645 08MN01
MN539 MN574 MN610 MN646 08MN02
MN540 MN575 MN611 MN647 08MN03
MN541 MN576 MN612 MN648 08MN04
MN542 MN577 MN613 MN649
MN543 MN578 MN614 MN650
MN544 MN579 MN615 MN651
MN545 MN580 MN616 MN652
MN546 MN581 MN617 MN653
MN547 MN582 MN618 MN654631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 3 of 10 NOTE: Pins already inspected in the frame of SB 631-32-22 0 do not need to be re-inspected.

PIN D56809 S/N PIN D57261 S/N PIN

D62079 S/N

MN601 MN637 MN673 MN472 08MN01 MN236
MN602 MN638 MN674 MN473 08MN02 MN237
MN603 MN639 MN675 MN475 08MN03 MN238
MN604 MN640 MN479 08MN04 MN239
MN605 MN641 MN484 08MN05 MN240
MN606 MN642 MN485 08MN06 MN241
MN607 MN643 MN486 08MN07 MN242
MN608 MN644 MN487 08MN08 MN243
MN609 MN645 MN488 MN244
MN610 MN646 MN494 MN245
MN611 MN647 MN760 MN246
MN612 MN648 MN762 MN247
MN613 MN649 MN766 MN248
MN614 MN650 MN787 MN249
MN615 MN651 MN788 MN250
MN616 MN652 MN789 MN251
MN617 MN653 MN790 MN252
MN618 MN654 MN791 MN253
MN619 MN655 MN792 MN254
MN620 MN656 MN793 MN255
MN621 MN657 MN794 MN256
MN622 MN658 MN795 MN257
MN623 MN659 MN796 MN258
MN624 MN660 MN797 MN259
MN625 MN661 MN798
MN626 MN662 MN799
MN627 MN663 MN800
MN628 MN664 MN801
MN629 MN665 MN802
MN630 MN666 MN803
MN631 MN667 MN804
MN632 MN668 MN805
MN633 MN669 MN806
MN634 MN670 MN807
MN635 MN671 MN808
MN636 MN672 MN809631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 4 of 10 ATR 42-300

NOTE: Pins already inspected in the frame of SB 631-32-22 0 do not need to be re-inspected. PIN D56841 S/N PIN D57401 S/N PIN

D57407 S/N

MN186 MN402 MN438 MN560 MN622 07MN01
MN219 MN403 MN439 MN561 MN627 07MN02
MN270 MN404 MN440 MN562 MN629 07MN03
MN307 MN405 MN441 MN563 MN630 07MN04
MN314 MN406 MN442 MN564 MN633 07MN05
MN332 MN407 MN443 MN636

MN372 MN408 MN444 MN641

MN373 MN409 MN445 MN645

MN374 MN410 MN446 MN646

MN375 MN411 MN447 MN649

MN376 MN412 MN448 MN652

MN377 MN413 MN449 MN655

MN378 MN414 MN450 MN658

MN379 MN415 MN451 MN660

MN380 MN416 MN452 MN663

MN381 MN417 MN453 MN668

MN382 MN418 MN454 MN677

MN383 MN419 MN455 MN680

MN384 MN420 MN456 MN684

MN385 MN421 MN457 MN699

MN386 MN422 MN458 MN782
MN387 MN423 MN459 MN783
MN388 MN424 MN460
MN389 MN425 MN461
MN390 MN426 MN462
MN391 MN427 MN463
MN392 MN428 MN464
MN393 MN429 MN465
MN394 MN430 MN466
MN395 MN431 MN467
MN396 MN432 MN468
MN397 MN433 MN555
MN398 MN434 MN556
MN399 MN435 MN557
MN400 MN436 MN558
MN401 MN437 MN559631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 5 of 10 NOTE: Pins already inspected in the frame of SB 631-32-22 0 do not need to be re-inspected. PIN D58807 S/N

MN400
MN413
MN471
MN474
MN475
MN480
MN481
MN482
MN486
MN490
MN491
MN493
MN497
MN498
MN499
MN500631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 6 of 10 ATR42-500.

NOTE: Pins already inspected in the frame of SB 631-32-22 0 do not need to be re-inspected.

PIN D62054 S/N PIN D63823 S/N PIN D63825 S/N

MN89 MN249 MN190 MN209 08MN16
MN90 MN250 MN191 MN210 08MN17
MN91 MN251 MN192 MN211 08MN18
MN92 MN252 MN193 MN212 08MN19
MN93 MN253 MN194 MN213 08MN20
MN94 MN254 MN195 MN214 08MN21
MN95 MN255 MN196 MN215 08MN22
MN96 MN256 MN197 MN216 08MN23
MN97 MN257 MN198 MN217 08MN24
MN98 MN258 MN219 MN218 08MN25
MN99 MN220 MN219 08MN26
MN100 MN221 MN220 08MN27
MN101 MN222 MN221 08MN28
MN184 MN223 MN222 08MN29
MN185 MN224 MN223 08MN30
MN186 MN225 MN224 08MN31
MN187 MN226 MN225 08MN32
MN188 MN227 MN226 08MN33
MN199 MN228 MN227 08MN34
MN200 MN249 MN228 08MN35
MN201 MN250 MN229 08MN36
MN202 MN251 08MN01 08MN37
MN225 MN252 08MN02 08MN38
MN226 08MN01 08MN03 08MN39
MN227 08MN02 08MN04 08MN40
MN228 08MN03 08MN05 08MN41
MN229 08MN04 08MN06 08MN42
MN230 08MN05 08MN07 08MN43
MN231 08MN06 08MN08 08MN44
MN232 08MN07 08MN09 08MN45
MN233 08MN08 08MN10 08MN46
MN234 08MN09 08MN11 08MN47
MN235 08MN10 08MN12 08MN48
MN236 08MN13 08MN49
MN247 08MN14 08MN50
MN248 08MN15631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 7 of 10 B. Reason.

(1) To ensure that the main landing gear leg/aircra ft front and rear hinge pins, the side braces assembly center pins, the barrel/swinging lever pin , U-joint/shock absorber pin and the swinging lever/U-joint pin are free of burning mark s and cracks.

C. Classification

Mandatory

D. Description. (See figure 1).

(1) The accomplishment of this Service Bulletin con sists in a one time inspection in the workshop, at the landing gear overhaul of subject p ins D56800, D56809, D57261, D62079, D56841, D57401, D57407, D58807, D62054, D63 823 and D63825 installed on MLG or in spare.

(2) Tasks to be carried out.

a) Workshop inspection (workshop inspection is done by M.R.O.).

E. Approval.

The technical content of this document is approved under the authority of D.O.A. N° EASA.21J044.

F. Manpower.

Work performed during overhaul.

G. Material - Cost and availability.

(1) Material. None.

(2) Cost : In case of scrap of a pin due to evidence of burn m ark and/or crack, the replacement pin will be chargeable at a discounted catalogue price - discount to be defined on a case by case basis, using a prorata calculation between CSN and life limit of the concerned P/N.

H. References.

- EASA Proposed Airworthiness Directive No. 14-034.

- EASA Airworthiness Directive No. TBC.

- Standard Practice Manual 20-00-10, PCS 2110.

- Standard Practice Manual 20-00-10, PCS 3600.

- Standard Practice Manual 20-00-10, PCS 3100.

I. Other publications affected.

None.631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 8 of 10 Location of the hinge pins to be inspected.

Figure 1. * D56800 * D57261

* D56809 and * D62079631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 9 of 10 2. ACCOMPLISHMENT INSTRUCTIONS.

A. General.

(1) This Service Bulletin is accomplished during ov erhaul of the MLG legs and braces.

(2) The inspections and the reconditioning of the p ins are accomplished in the workshop.

B. Inspection of hinge pin in workshop (by M.R.O.).

(1) Do a visual inspection of the part. - If chromium found crack, ship the part to Messier -Bugatti-Dowty Laboratory at, Materials Laboratory Messier-Dowty Ltd Cheltenham Road East Gloucester GL2 9QH England

Attention to Sarah Jones Join to the part shipped a copy of the reporting fo rm of the workshop, at the end of this SB. - If no crack found on the chromium inspect the par t as per (3) and (4). (2) Remove the chromium plating in accordance with PCS 2110. (3) Do an inspection in accordance with PCS 3600. (4) Do a magnetic particle inspection in accordance with PCS 3100. (5) If finding on (3) or (4), ship the part to Mess ier-Bugatti-Dowty Laboratory at, Materials Laboratory Messier-Dowty Ltd Cheltenham Road East Gloucester GL2 9QH England

Attention to Sarah Jones. Join to the part shipped a copy of the reporting fo rm of the workshop, at the end of this SB. - if no finding, re apply the chromium, as per (6)

.

(6) Re apply chromium plating in accordance with PC S 2110.

NOTE: Complete the REPORTING FORM (at the end of th is Service Bulletin).

C. Inspection reports.

Send the inspection reports duly completed to MESSI ER-BUGATTI-DOWTY Technical Support.

mailto: eamecsc@safranmbd.com Fax: (+33) 1 46297948

With complete data filled by repair station.631-32-220



# SERVICE BULLETIN

March 03, 2014 Service Bulletin N° 631-32-220 Page 10 of 10 

# REPORTING FORM

ATR42 MLG Hinge Pins Inspection 

# MBD/RIL/220/2014

Please complete all areas with relevant data for ea ch pin.

INSPECTION OF PINS BASE METAL BEHAVIOUR IN REPAIR S HOP

REPAIR CENTER : DATE :

OPERATOR : LEG ASSY : LEG P/N + SN : A/C MSN TOTAL CYCLES : CSN : CSO :

P/N OF PIN CSN : S/N OF PIN CSO : ACID ETCH finding defect YES : NO :

MAGNETIC PARTICLE INSPECTION finding defect YES : NO :

Please return by email or Fax to:

MESSIER-BUGATTI-DOWTY Technical Support mailto: eamecsc@safranmbd.com Fax: (+33) 1 46297948

With complete data filled by repair station.