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 therein 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 axle 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 therein 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 necessary 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 therein 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 therein 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 therein 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 therein 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 therein 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 therein 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 therein 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 piston.

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. 

Upper side 

Upper 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 therein 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: