631-32-219 

Inovel Parc Sud 

78140 Vélizy-Villacoublay 

Tél. +33 (0)1 46 29 18 00 

Fax +33 (0)1 46 29 18 01 

SERVICE BULLETIN 

March 03, 2014 Service Bulletin N° 631-32-219 

Page 1 of 8

ATR 72 MAIN LANDING GEAR HINGE PINS INSPECTION 

1. PLANNING INFORMATION. 

A. Effectivity. 

(1) In-service aircraft affected. 

 ATR 72 all types. 

(2) In-service and spare components affected. 

Pins D60955, D60968, D61032, D61061, and D60999 listed in the following table. 
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SERVICE BULLETIN 

March 03, 2014 Service Bulletin N° 631-32-219

Page 2 of 8 

PIN PIN 

D60968 

S/N 

PIN 

D61032 

S/N 

D60955 

S/N 

SN414 MN31 MN419 MN376 MN412 

SN415 MN312 MN420 MN377 MN413 

SN416 MN353 MN421 MN378 MN414 

SN417 MN355 MN422 MN379 MN415 

SN418 MN362 MN423 MN380 

SN419 MN365 MN424 MN381 

SN420 MN366 MN425 MN382 

SN421 MN368 MN426 MN383 

SN422 MN374 MN427 MN384 

SN423 MN376 MN428 MN385 

MN377 MN429 MN386 

MN379 MN430 MN387 

MN380 MN431 MN388 

MN381 MN432 MN389 

MN382 MN433 MN390 

MN383 MN434 MN391 

MN385 MN435 MN392 

MN393 MN436 MN393 

MN401 MN437 MN394 

MN402 MN438 MN395 

MN403 MN439 MN396 

MN404 MN440 MN397 

MN405 MN441 MN398 

MN406 MN442 MN399 

MN407 MN443 MN400 

MN408 MN444 MN401 

MN409 MN445 MN402 

MN410 MN446 MN403 

MN411 MN447 MN404 

MN412 MN448 MN405 

MN413 MN449 MN406 

MN414 MN407 

MN415 MN408 

MN416 MN409 

MN417 MN410 

MN418 MN411 

NOTE: Pins already inspected in the frame of SB 631-32-219 do not need to be re-inspected. 

 
 631-32-219 

SERVICE BULLETIN 

March 03, 2014 Service Bulletin N° 631-32-219 

Page 3 of 8

PIN 

D61061 

S/N 

MN359 07MN03 07MN39 

MN364 07MN04 07MN40 

MN370 07MN05 12MN00101

MN371 07MN06 12MN00102

MN372 07MN07 12MN00103

MN513 07MN08 12MN00104

MN514 07MN09 12MN00105

MN515 07MN10 12MN00106

MN516 07MN11 12MN00107

MN517 07MN12 12MN00108

MN518 07MN13 12MN00109

MN519 07MN14 12MN00110

MN520 07MN15 12MN00111

MN521 07MN16 12MN00112

MN522 07MN17 12MN00113

MN523 07MN18 12MN00114

MN594 07MN19 12MN00115

MN595 07MN20 12MN00116

MN596 07MN21 12MN00117

MN597 07MN22 12MN00118

MN598 07MN23 

MN599 07MN24 

MN600 07MN25 

MN601 07MN26 

MN602 07MN27 

MN603 07MN28 

MN618 07MN29 

MN619 07MN30 

MN620 07MN31 

MN621 07MN32 

MN622 07MN33 

MN623 07MN34 

MN624 07MN35 

MN625 07MN36 

07MN01 07MN37 

07MN02 07MN38 

NOTE: Pins already inspected in the frame of SB 631-32-219 do not need to be re-inspected. 

 
 631-32-219 

SERVICE BULLETIN 

March 03, 2014 Service Bulletin N° 631-32-219 

Page 4 of 8

PIN 

D60999 

S/N

MN318 07MN124 07MN160 07MN196 08MN33 

MN325 07MN125 07MN161 07MN197 08MN34 

MN328 07MN126 07MN162 07MN198 08MN35 

MN330 07MN127 07MN163 07MN199 08MN36 

MN331 07MN128 07MN164 08MN01 08MN37 

MN332 07MN129 07MN165 08MN02 08MN38 

MN333 07MN130 07MN166 08MN03 08MN39 

MN334 07MN131 07MN167 08MN04 08MN40 

MN603 07MN132 07MN168 08MN05 

MN604 07MN133 07MN169 08MN06 

MN605 07MN134 07MN170 08MN07 

MN606 07MN135 07MN171 08MN08 

07MN013 07MN136 07MN172 08MN09 

07MN014 07MN137 07MN173 08MN10 

07MN015 07MN138 07MN174 08MN11 

07MN016 07MN139 07MN175 08MN12 

07MN017 07MN140 07MN176 08MN13 

07MN018 07MN141 07MN177 08MN14 

07MN019 07MN142 07MN178 08MN15 

07MN020 07MN143 07MN179 08MN16 

07MN021 07MN144 07MN180 08MN17 

07MN022 07MN145 07MN181 08MN18 

07MN023 07MN146 07MN182 08MN19 

07MN047 07MN147 07MN183 08MN20 

07MN048 07MN148 07MN184 08MN21 

07MN049 07MN149 07MN185 08MN22 

07MN050 07MN150 07MN186 08MN23 

07MN051 07MN151 07MN187 08MN24 

07MN052 07MN152 07MN188 08MN25 

07MN053 07MN153 07MN189 08MN26 

07MN054 07MN154 07MN190 08MN27 

07MN055 07MN155 07MN191 08MN28 

07MN056 07MN156 07MN192 08MN29 

07MN057 07MN157 07MN193 08MN30 

07MN058 07MN158 07MN194 08MN31 

07MN123 07MN159 07MN195 08MN32 

NOTE: Pins already inspected in the frame of SB 631-32-219 do not need to be re-inspected. 

 
 631-32-219 

SERVICE BULLETIN 

March 03, 2014 Service Bulletin N° 631-32-219 

Page 5 of 8

B. Reason. 

(1) To ensure that the main landing gear leg/aircraft front hinge pin, the side braces assembly 

center pin, the barrel/swinging lever pin, shock absorber/universal joint hinge 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 D60999, D61061, D60968, 

D60955, and D61032, 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. 
 631-32-219 

SERVICE BULLETIN 

March 03, 2014 Service Bulletin N° 631-32-219 

Page 6 of 8

D60999

Location of the hinge pins to be inspected. 

Figure 1 

 

D60968

D60955

D61061

D61032 
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SERVICE BULLETIN 

March 03, 2014 Service Bulletin N° 631-32-219 

Page 7 of 8

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 etch 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. 
 631-32-219 

SERVICE BULLETIN 

March 03, 2014 Service Bulletin N° 631-32-219 

Page 8 of 8

REPORTING FORM 

ATR72 MLG Hinge Pins Inspection 

MBD/RIL/219/2014 

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.