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 631-32-220 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 MN654 
631-32-220 

 SERVICE BULLETIN

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

Page 3 of 10

NOTE: Pins already inspected in the frame of SB 631-32-220 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 MN809 
631-32-220 

 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 631-32-220 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 MN559 
631-32-220 

 SERVICE BULLETIN

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

Page 5 of 10

NOTE: Pins already inspected in the frame of SB 631-32-220 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 

MN500 
631-32-220 

 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 631-32-220 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 08MN15 
631-32-220 

 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/aircraft 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 marks and cracks. 

 C. Classification 

Mandatory 

D. Description. (See figure 1).

(1) The accomplishment of this Service Bulletin consists in a one time inspection in the 

workshop, at the landing gear overhaul of subject pins D56800, D56809, D57261, 

D62079, D56841, D57401, D57407, D58807, D62054, D63823 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 mark 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 * D62079 
631-32-220 

 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 overhaul of the MLG legs and braces. 

(2) The inspections and the reconditioning of the pins 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 form of the workshop, at the end of this SB. 

- If no crack found on the chromium inspect the part 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 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 form 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 PCS 2110. 

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

C. Inspection reports. 

Send the inspection reports duly completed to MESSIER-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 each pin. 

INSPECTION OF PINS BASE METAL BEHAVIOUR IN REPAIR SHOP 

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.