631-32-216 

Inovel Parc Sud 

78140 Vélizy-Villacoublay 

Tél. +33 (0)1 46 29 18 00 

Fax +33 (0)1 46 29 18 01 

SERVICE BULLETIN 

October 30, 2013 Service Bulletin N° 631-32-216

Page 1 of 9 

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 

 

MLG LEG PINS S/N 

 

 

MN407 MN417 MN523 MN536 MN733 07MN00059

MN408 MN418 MN525 MN537 MN741 07MN00060

MN409 MN419 MN526 MN538 MN765 07MN00061

MN410 MN420 MN527 MN539 MN767 07MN00062

MN411 MN421 MN528 MN550 MN768 07MN00064

MN412 MN422 MN530 MN552 MN769 07MN00065

MN413 MN423 MN531 MN554 MN770 07MN00066

MN414 MN424 MN533 MN555 MN771 07MN00067

MN415 MN520 MN534 MN557 MN772 07MN00068

MN416 MN522 MN535 MN559 MN773 07MN00069

NOTE: Pins already inspected in the frame of SB 631-32-216 do not need to be re-inspected. 

December 17, 2013 (Rev.1) 
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SERVICE BULLETIN 

October 30, 2013 Service Bulletin N° 631-32-216

Page 2 of 9 

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 hinge 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 pin 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 

C/O: Messier Services 

Meteor Business Park 

Cheltenham Road East 

Gloucester 

GL2 9QL 

England 

Using MESSIER-BUGATTI-DOWTY DHL Global Forwarding Account number 60281. 

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 

 

December 17, 2013 (Rev.1) 
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SERVICE BULLETIN 

October 30, 2013 Service Bulletin N° 631-32-216

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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 D61000qty 1 

 Cotter pin MS24665-285 qty 2 

 Nut MS17825-7 qty 2 

Washer D61282qty 2 

(2) Cost 

 The necessary parts are provided 

- Free of Charge to operators 

H. References 

- EASA Proposed Airworthiness Directive No. 14-034. 

- EASA Airworthiness Directive No. TBC. 

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

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

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

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

- Component Maintenance Manual 32-18-34 Leg structure 

I. Other publications affected 

None. 

 

December 17, 2013 (Rev.1) 
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SERVICE BULLETIN 

October 30, 2013 Service Bulletin N° 631-32-216

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 631-32-216 

SERVICE BULLETIN 

October 30, 2013 Service Bulletin N° 631-32-216

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2. ACCOMPLISHMENT INSTRUCTIONS 

A. General 

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

of the hinge pin, once MLG Leg has been removed from aircraft trough 

AMM JIC 32-11-00-RAI-1000. 

The inspection 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 organization as per Maintenance 

Organization 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 pin. 

(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 

 
 631-32-216 

SERVICE BULLETIN 

October 30, 2013 Service Bulletin N° 631-32-216

Page 6 of 9 

(2) Send by the fastest way the removed hinge pin with form page in the Reporting Form 

(at the end of this Service Bulletin) duly filled in to: 

MESSIER -BUGATTI-DOWTY 

Retrofit Team 

C/O: Messier Services 

Meteor Business Park 

Cheltenham Road East 

Gloucester 

GL2 9QL 

England 

 

 Using MESSIER-BUGATTI-DOWTY DHL Global Forwarding: Account number: 60281 

C. Installation of the new hinge pin on MLG leg 

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

Organization 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 pin 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 pin D61004 (16). 

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

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

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. 

 

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SERVICE BULLETIN 

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(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). 

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: 

MESSIER-BUGATTI-DOWTY Technical Support 

mailto:eamecsc@safranmbd.com

Fax: (+33) 1 46297948 

December 17, 2013 (Rev.1) 
 631-32-216 

SERVICE BULLETIN 

October 30, 2013 Service Bulletin N° 631-32-216

Page 8 of 9 

REPORTING FORM 

ATR72MLG Hinge Pin Inspection 

MBD/RIL/216/2013 

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:(+33) 146297948 

MESSIER-BUGATTI-DOWTY Technical Support 

mailto:eamecsc@safranmbd.com

Fax:(+33) 146297948 

 

IACO Code: 
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SERVICE BULLETIN 

October 30, 2013 Service Bulletin N° 631-32-216

Page 9 of 9 

INSPECTION OF PIN BASE METAL BEHAVIOUR IN REPAIR SHOP 

REPAIRCENTER : DATE : 

OPERATOR : 

 

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. 

December 17, 2013 (Rev.1)