631-32-213 

Inovel Parc Sud 

78140 Vélizy-Villacoublay 

Tél. +33 (0)1 46 29 18 00 

Fax +33 (0)1 46 29 18 01 

SERVICE BULLETIN 

December 16, 2013 Service Bulletin N° 631-32-213

Page 1 of 10

ATR 72 MAIN LANDING GEAR HINGE PIN INSPECTION 

1. PLANNING INFORMATION 

A. Effectivity 

(1) In-service aircraft affected 

 ATR 72 all types 

(2) In-service and spare components affected 

 Pins of MLG legs D23189000 (LH) and D23190000 (RH) all modification suffixes 

 listed in the following table. 

(3) Parts concerned by the present Special Inspection: pins D61000 listed in the following 

table 

a) That have been previously inspected by SPRO as per Service Bulletin 631-32-125 in 

the frame of the DGAC AD 1996-096-29 (B), 

b) For operator which cannot determine which MRO has accomplished the inspection as 

per MESSIER-BUGATTI-DOWTY Service Bulletin 631-32-125 in the frame of the 

DGAC Airworthiness Directive 1996-096-029 (B) 

 
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December 16, 2013 Service Bulletin N° 631-32-213

Page 2 of 10 

 

MLG LEG PINS S/N 

 

MN1 MN56 MN102 MN149 MN198 MN252 MN302 

MN2 MN57 MN104 MN150 MN199 MN253 MN304 

MN4 MN58 MN105 MN151 MN200 MN254 MN305 

MN5 MN59 MN106 MN152 MN201 MN255 MN306 

MN7 MN60 MN107 MN153 MN202 MN256 MN307 

MN8 MN61 MN108 MN154 MN203 MN257 MN308 

MN13 MN62 MN109 MN155 MN204 MN258 MN309 

MN15 MN63 MN110 MN156 MN205 MN259 MN310 

MN16 MN64 MN111 MN157 MN206 MN260 MN311 

MN17 MN65 MN112 MN158 MN207 MN261 MN312 

MN19 MN66 MN113 MN159 MN208 MN262 MN313 

MN20 MN67 MN114 MN160 MN209 MN264 MN314 

MN21 MN68 MN115 MN161 MN210 MN265 MN315 

MN22 MN69 MN116 MN163 MN211 MN266 MN316 

MN23 MN70 MN117 MN164 MN212 MN267 MN317 

MN24 MN71 MN118 MN165 MN213 MN268 MN318 

MN25 MN72 MN119 MN166 MN214 MN270 MN319 

MN26 MN73 MN120 MN167 MN215 MN271 MN320 

MN28 MN74 MN121 MN168 MN216 MN272 MN321 

MN29 MN75 MN122 MN169 MN217 MN273 MN324 

MN30 MN76 MN123 MN170 MN218 MN274 MN325 

MN31 MN77 MN124 MN171 MN219 MN275 MN326 

MN32 MN78 MN125 MN172 MN220 MN277 MN328 

MN33 MN79 MN126 MN173 MN223 MN278 MN340 

MN34 MN80 MN127 MN174 MN224 MN279 MN342 

MN35 MN81 MN128 MN175 MN225 MN280 MN348 

MN36 MN82 MN129 MN176 MN226 MN281 MN352 

MN37 MN83 MN130 MN177 MN227 MN282 MN354 

MN38 MN84 MN131 MN178 MN228 MN283 MN358 

MN39 MN85 MN132 MN179 MN229 MN284 MN359 

MN40 MN86 MN133 MN180 MN230 MN285 MN360 

MN41 MN87 MN134 MN181 MN233 MN287 MN361 

MN42 MN88 MN135 MN182 MN234 MN288 MN363 

MN43 MN89 MN136 MN183 MN235 MN289 MN364 

MN44 MN90 MN137 MN184 MN236 MN290 MN367 

MN45 MN91 MN138 MN186 MN237 MN291 MN368 

MN46 MN92 MN139 MN187 MN238 MN292 MN373 

MN47 MN93 MN140 MN188 MN239 MN294 MN375 

MN48 MN94 MN141 MN189 MN241 MN295 MN379 

MN49 MN95 MN142 MN190 MN242 MN296 MN380 

MN50 MN96 MN143 MN191 MN243 MN297 MN386 

MN51 MN97 MN144 MN192 MN244 MN298 

MN52 MN98 MN145 MN193 MN246 MN299 

MN53 MN99 MN146 MN194 MN248 MN300 

MN54 MN100 MN147 MN195 MN249 MN301 

MN55 MN101 MN148 MN196 MN251 MN303 

NOTE: Pins D61000 to be inspected are: those previously inspected by SPRO (in the frame of 

SB 631-32-125) or when the MRO is unknown. 

 Pins already inspected in the frame of SB 631-32-213 do not need to be re-inspected. 
 631-32-213 

SERVICE BULLETIN 

December 16, 2013 Service Bulletin N° 631-32-213

Page 3 of 10

B. Reason 

(1) To ensure that the main landing gear leg/aircraft hinge pin is free of burning marks and 

cracks. 

(2) A replacement program of the pins D61000 will be proposed to each airline by 

MESSIER-BUGATTI-DOWTY Customer Support. The Regional Customer Support 

Centers will directly contact each airline when replacement parts are available. 

C. Classification 

Mandatory 

D. Description (see figure 1)

(1) The accomplishment of this Service Bulletin consists in the replacement of subject pins 

D61000 installed on aircraft or in spare and their one time inspection in the workshop. 

(2) Tasks to be carried out 

 a) On MLG Leg once removed from aircraft 

 Replacement of pins D61000 by a new one or reconditioned one free of defects, 

b) Ship the removed pin D61000, sending it by the fastest way with duly completed 

form found in the Reporting Form (at the end of this Service Bulletin) to: 

MESSIER -BUGATTI-DOWTY 

RETROFIT TEAM 

C/O: Messier Services 

Meteor Business Park 

Cheltenham Road East 

Gloucester 

GL2 9QL 

England 

c) Workshop inspection (workshop inspection is done by MESSIER-BUGATTIDOWTY) 

E. Approval 

The technical content of this document is approved under the authority of D.O.A. 

 N° EASA.21J044 

 
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SERVICE BULLETIN 

December 16, 2013 Service Bulletin N° 631-32-213

Page 4 of 10

F. Manpower 

Estimated time for the removal and installation of the two pins on aircraft: 

 Manpower: 2 men 

 Man-hours: 8 

 Elapsed time: 4 hours 

G. Material - Cost and availability 

(1) Necessary parts for replacement on aircraft for 1 MLG leg 

 Pin D61000 qty 1 

 Cotter pin MS24665-285 qty 2 

 Nut MS17825-7 qty 2 

Washer D61282 qty 2 

(2) Cost 

 The necessary parts are provided 

- Free of Charge to the operators when the hinge pin D61000 has been previously 

inspected by SPRO in the frame of SB 631-32-125. 

- Discount of 40% on catalogue price for the operator that cannot determine which 

MRO has previously accomplished the inspection as per Service Bulletin 631-32-125. 

H. References 

- EASA Proposed Airworthiness Directive No. 14-034 

- EASA Airworthiness Directive No. TBC 

- DGAC Airworthiness Directive No. 96-096-029 (B) 

- Job Instruction cards (JIC) 321100-RAI-10000 Removal/installation of MLG leg 

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

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

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

- Component Maintenance Manual 32-18-34 Leg structure 

I. Other publications affected 

None. 

 
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December 16, 2013 Service Bulletin N° 631-32-213

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SERVICE BULLETIN 

December 16, 2013 Service Bulletin N° 631-32-213

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2. ACCOMPLISHMENT INSTRUCTIONS 

A. General 

This Service Bulletin is accomplished with the aircraft lifted on jacks for the removal and 

installation of the hinge pins, once MLG Leg has been removed from aircraft through AMM JIC 

32-11-00-RAI-10000 

The inspections and the reconditioning of the pins are accomplished in the workshop. 

B. Procedure to remove the hinge pin D61000 from the MLG leg (Refer to figure 2) 

NOTE: Task may be performed by a line maintenance organisation as per Maintenance 

Organisation Approvals - EASA part 145 regulation N°. EC2042/2003 Revision August 

2012 – Acceptable Means of Compliance AMC 145.A.10 paragraph 1 (b). 

 (1) Removal of the leg/aircraft rear hinge pins 

(a) Remove and discard cotter pin MS24665-285 (13), nut MS17825-14 (14) and washer 

D61282 (15) 

(b) Remove the bolt D61004 (16) 

(c) Remove the pin D61000 (12) 

Figure 2 

(2) Send by the fastest way removed pins with form page in the Reporting Form (at the end of 

this Service Bulletin) duly filled in to: 
 631-32-213 

SERVICE BULLETIN 

December 16, 2013 Service Bulletin N° 631-32-213

Page 7 of 10

MESSIER -BUGATTI-DOWTY 

RETROFIT TEAM 

C/O: Messier-Services 

Meteor Business Park 

Cheltenham Road East 

Gloucester 

GL2 9QL 

England 

C. Installation of the new hinge pins on MLG leg 

NOTE: Task may be performed by a line maintenance organization as per Maintenance 

Organisation Approvals - EASA part 145 regulation N°. EC2042/2003 Revision August 

2012 – Acceptable Means of Compliance AMC 145.A.10 paragraph 1 (b). 

Install the new rear pin (or reconditioned one free of defect) on the leg structure in accordance 

with instructions given in the following procedure (see figure 2). 

(1) Fitment of pins D61000 on MLG leg (see figure 2) 

(a) Fit in position on MLG Leg the pin D61000 (12) and align the holes provided for 

passage of pins D61004 (16). 

(b) Fit pin D61004 (16) and washer D61282 (15) 

(c) Screw on nut MS17825-7 (14). Torque nut between 4,4 m daN to 5,2 m daN (389.3 

and 460 lbf in) 

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

D. Inspection and overhaul of hinge pin in workshop (by Messier-Bugatti-Dowty) 

(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. 

 
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SERVICE BULLETIN 

December 16, 2013 Service Bulletin N° 631-32-213

Page 8 of 10

(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). 

NOTE: Depending on inspection results, MBD reserves its rights to release, once overhauled, the parts 

inspected pursuant to the present service bulletin. Such parts shall then return into service, 

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

E. Inspection reports 

Send the inspection reports duly completed to the retrofit team. 

Retrofit team 

Mail to: retrofit@safranmbd.com

 
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SERVICE BULLETIN 

December 16, 2013 Service Bulletin N° 631-32-213

Page 9 of 10

REPORTING FORM 

ATR72 MLG Hinge Pin Inspection 

MBD/RIL/213/2013 

Please complete all coloured areas with relevant data. 

Operator 

Aircraft concerned 

MSN Tail Number 

Main Landing Gear information 

LH Part Number LH Serial Number 

RH Part Number RH Serial Number 

Hinge Pin information 

LH Part Number LH Serial Number 

CSN TSN 

CS0 TSO 

RH Part Number RH Serial Number 

CSN TSN 

CS0 TSO 

Non prepared runways landings ? 1 No Yes 

If yes please indicate the number of cycles : 

Replacement Organisation 

On-Wing? 1 No Yes 

Pro-Forma Completed by

Name 

Designation 

Telephone number 

Email Address 

Date (DD/MM/YYYY)

Signed by: ________________________________________________________________ 

Please return by email or Fax to: 

MESSIER-BUGATTI-DOWTY Retrofit Team 

mailto: retrofit@safranmbd.com

Fax: +44 (0) 1452 711 972 

 

IACO Code: 
 631-32-213 

SERVICE BULLETIN 

December 16, 2013 Service Bulletin N° 631-32-213

Page 10 of 10

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 Retrofit Team 

mailto: retrofit@safranmbd.com

Fax: +44 (0) 1452 711 972 

And to 

MESSIER-BUGATTI-DOWTY Technical Support 

mailto: eamecsc.safranmbd.com 

Fax: (+33) 1 46297948 with complete data filled by repair station.