## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

Page 1 2 3 4 5 6 7 8 9 10 Revision - - - - - - - - - -

Oct 02/09 SBF100-32-158 Page 1 LANDING GEAR

Main Landing Gear - One-time Inspection of the Piston for Cracks

1. Planning Information A. Effectivity (1) F28 Mark 0070/0100 aircraft serial numbers:
11244 thru 11585

B. Concurrent Requirements (1) Not applicable. C. Reason (1) During a normal walkaround check a large crack was discovered in the lower portion of the RH main landing gear piston. Visual examination of the piston showed a crack running on the aft side, from the upper part of the wheel axle platform down through the area between the lower torque link attachment lugs, to the bore on the lower side of the piston. Also a horizontal crack running on the aft side of the piston, in the transition area from piston tube to wheel ax le platform, was visible see figure 2 for more details. (2) The affected main landing gear accumulated 7909 FC. The piston has been sent to Goodrich for detailed investigation. The affected operator visually inspected all MLG pistons in their fleet without any further findings. (3) In order to safeguard fleet airworthiness a detailed visual inspection of all Goodrich MLG pistons is required as a short term action. After the inspections are finalized, the results in combination with the findings of the crack/metallurgical investigation of the cracked piston will be used to determine the necessity of additional and/or more detailed inspections. If equipped with Goodrich MLG pn’s : 41050 -7/-8/-9/-10/-11/-12/-13/-14/-15/-16 41060 -1/-2/-3/-4/-5/-6

## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

SBF100-32-158 Oct 02/09 Page 2 D. Description (1) This Service Bulletin tells you how to:

- Do an inspection of the MLG piston.

- Report back all findings to Fokker Services. E. Compliance (1) Recommended. Fokker Services recommends the accomplishment of this Service Bulletin within 6 weeks after the issue date of this Service Bulletin. NOTE : It is expected that EASA will issue an Airworthiness Directive (AD) with respect to this subject with the same compliance terms. Refer to the EASA website for the publication of this Airworthiness Directive. F. Approval (1) The technical content of this document is approved by EASA or under the authority of DOA nr. EASA.21J.059. G. Manpower (1) Approximately 2,2 man-hours are necessa ry to do this Service Bulletin on one aircraft. This table of manpower will help you to schedule and do this Service Bulletin: Instructions Men Man-hours Elapsed time (hours) Removal 2 1,0 0,5 Modification Inspection 2 0,2 0,1 Installation 2 1,0 0,5 Testing - - - Total 2 2,2 1,1 NOTE : This estimate does not include the time necessary for corrective action. (2) The estimated hours are for direct labor done by experienced personnel. They are calculated based on the conditions given in SBF100-00-001 (Service Bulletin Introduction, section 2.C., "Manpower").

H. Weight and Balance

## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

Oct 02/09 SBF100-32-158 Page 3 (1) Weight change: None Index change: None.
I. Electrical Load Data (1) Not affected. J. Software Accomplishment Instructions (1) Not applicable. K. References (1) Fokker 70/100 Aircraft Maintenance Manual (AMM) Fokker 70/100 Illustrated Parts Catalog (IPC) Fokker Consumable Material List (CML) Goodrich SB 41000-32-28 L. Publications Affected (1) This SB affects the publications listed below: (a) Maintenance Documentation
Not affected. (b) Maintenance Programs
Not affected. (c) Special Instructions for Continued Airworthiness (ICA) The effect of this Service Bulletin on the special ICA is as follows:

YES NO - Electrical Wiring Interconnection System (EWIS) - X - Fuel Tank Safety (FTS) - X - Damage Tolerance of Fatigue Critical Structure - X NOTE : If “YES”, when not already incorporated, the changed ICA will be incorporated in the MRB document within one calendar year from the date of issue of this Service Bulletin. Until then, no actions are required. (d) Operational Documentation
Not affected. (2) For incorporation of this Service Bulletin in your documentation refer to SBF100-00-001 (Service Bulletin Introduction, section 4 "Incorporation of Service Bulletins in Documentation of Fokker Services").

## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

SBF100-32-158 Oct 02/09 Page 4 M. Interchangeability or Intermixability of Parts (1) Not applicable.

## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

Oct 02/09 SBF100-32-158 Page 5 2. Material Information A. Material – Price and Availability (1) The materials are local source items. B. Material Required (1) These parts, which are necessary to complete this Service Bulletin on 1 aircraft, are not part of the mod kit.
New Part Number Qty Keyword Info Old Part Number Instructions/ Disposition MS24665-151 8 Split pin - MS24665-151 Local source

(2) These mod kit parts are necessary to do this Service Bulletin on 1 aircraft. (a) Not applicable. C. Tooling – Price and Availability (1) Not applicable. D. Drawings Required (1) Not applicable.

## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

SBF100-32-158 Oct 02/09 Page 6 3. Accomplishment Instructions
General:

- Put up warning signs in the flight compartment and at the hydraulic ground-servicing panel to

tell persons: “DO NOT PRESSURIZE THE HYDRAULIC SYSTEMS”.

- Make sure the ground safety pins are installed.

- These instructions are applicable to the left and right MLG installations. WARNING : BE CAREFUL WHEN YOU USE THE CONSUMABLE MATERIALS. OBEY THE INSTRUCTIONS AND MANUFACTURER'S HEALTH AND SAFETY INSTRUCTIONS. A. Lift the Aircraft with Jacks ref. AMM chapter 07-11-00-582-812. or Lift One Landing Gear with a Jack ref. AMM chapter 07-11-00-582-832. B. Remove one MLG wheel and brake from the LH and/or RH MLG (this to create adequate access for the cleaning and inspection of the piston), refer to AMM chapter 32-42-01-000-814. C. Remove the Protection plate pn 41231-1 from the piston, refer to figure 1 and to IPC chapter 32-11-11. Keep the protection plate, bolts, nuts and washers. Discard the split pins. D. Clean the piston pn 41140-3 or pn 41140-5 in the inspection area in accordance with Goodrich Service Bulletin SB 41000-32-28. E. Inspect the wheel axle platform between the lower torque link attachment lugs for cracks in accordance with Goodrich Service Bulletin SB 41000-32-28. NOTE: See figure 2 of this Service Bulletin for details of the found cracks in the MLG piston. F. Replace a cracked piston in accordance with AMM chapter 32-11-08-000/400-814. G. Install the protection plate on the bottom side of the MLG piston, refer to figure 1 and to IPC chapter 32-11-11. Wrench torque the 4 bolts to 9 – 11,3 Nm (80 – 100 inch.lbs). Use the parts that you kept in step C and use new split pins pn MS24665-151. H. Install the MLG wheel and brake on the LH and/or RH MLG, refer to AMM chapter 32-42-01-400-814. I. Lower the Aircraft, ref. AMM chapter 07-11-00-582-822. or Lower the Landing Gear, ref. AMM 07-11-00-582-842, and repeat steps A through J on the other Landing Gear. J. Do the re-identification in accordance with Goodrich SB 41000-32-28.

## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

Oct 02/09 SBF100-32-158 Page 7 K. Remove warning signs. L. Clean the work area from tools, ground equipment, materials and debris. M. Complete the attached questionnaire with the applicable information and send to Fokker Services. NOTE: If a crack is found, report to Goodrich in accordance with the instructions in Goodrich SB 41000-32-28.

## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

SBF100-32-158 Oct 02/09 Page 8 Protection Plate Installation Figure 1 Typical installation of the protection plate (only RH side shown) 

### A

## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

Oct 02/09 SBF100-32-158 Page 9 Example of a Crack in the Piston Figure 2 

### Location of cracks in the MLG p iston. INSPECTION:

• Thoroughly clean the inspection area.

• Use a 10X magnifier to examine the area for cracks. NOTE 1: Pay particular attention to the areas adjacent to the wiring harness hole. NOTE 2: The expanding plug may remain installed. U pp er side

U pp er side

Bottom side Bottom side

## Service Bulletin Fokker 70/100

Copyright All rights reserved by Fokker Services B.V. (The Netherlands). This document has been supplied by Fokker Services B.V . to its customers on a confidential basis subject to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof, or the use of any information contained there in for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written permission of Fokker Services B.V.

SBF100-32-158 Oct 02/09 Page 10 

## Questionnaire SBF100-32-158 MLG Piston Inspection for Cracks

Send to : Fokker Services Technical Services Fax : 31 (0) 252 627211 E mail : technicalservices.fokkerservices@stork.com



## Airline: ______________ A/C sn: ________ Accomplish date: _____ A/C FH's: ______ A/C FC's: ______ LH MLG RH MLG Crack: Yes / No Yes / No MLG Pn: MLG Sn: MLG CSN MLG CSO
Piston Pn: Piston Sn: