Component Service Bulletin 

Page 1 2 3 4 5 6 7 8 9 10 11 

Revision - - - - - - - - - - - 

Nov 17/11 D13312-52-015 

Page 1 

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. 

DOORS

 Main Landing Gear Doors - An Inspection and Modification of the Attachment Bolts of the 

 Operating Rod Bracket to the Outer Skin of the Carbon Fiber 

 Reinforced Plastic (CFRP) MLG Outboard Doors. 

1. Planning Information

A. Effectivity 

(1) Keyword : Main Landing Gear (MLG) Outboard Door. 

(2) Part Number(s) : D13312- 702up to & incl. -711.* 

 (and -401 up to & incl. -410) 

(3) Serial Number(s) : All. 

(4) Used on : F28 Mark 0070/0100. 

B. Concurrent Requirements 

(1) For part numbers D13312-401 up to & incl. -410: 

Before, or at the same time as you do this SB, you must do: 

- Component Service Bulletin (CSB) D13312-52-009 - DOORS - Main Landing 

Gear Doors - A Modification of the Attachment of the Operating Rod Bracket to 

the Outer Skin of the Carbon Fiber Reinforced Plastic (CFRP) Main Landing Gear 

(MLG) Outboard Doors. 

* NOTE: When CSB D13312-52-009 is accomplished the partnumbers D13312-401 

 up to & incl. -410 have become D13312-702 up to & incl. -711, resp. 
Component Service Bulletin 

D13312-52-015 Nov 17/11 

Page 2 

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. 

C. Reason 

(1) An event occurred where, after landing gear down selection, a MLG unsafe indication 

appeared on the MFDU and the green MLG down and locked indication light 

remained off. Several cycles with the normal landing gear selector handle did not 

result in a down and locked situation for the MLG. Also after using the alternate 

procedure the problem persisted. When the aircraft finally landed the MLG involved 

was suddenly forced into its down and locked position. However, due to this sudden 

movement a pressure pulse was generated as a result of which the other MLG got 

unlocked and collapsed. 

(2) This CSB only addresses the cause of the MLG not attaining its down and locked 

position in flight. Investigation revealed that the bracket of the rod in the MLG 

outboard door was detached from the outboard door, got stuck between the MLG and 

wing lower skin, thus obstructing the MLG to lock properly in flight. 

(3) As a result of similar previous occurrences Component Service Bulletin D13312-52-

009 was already introduced, in December 2005, to inspect and modify the attachment 

of the operating rod bracket. After this modification several operators reported 

breaking of the recessed head of the titanium attachment bolts of the operating rod 

bracket to the CFRP MLG outboard door. The remaining bolt shafts are then pulled 

through the external repair patch and the carbon fiber door outer skin. The result 

could be that the operating rod, with the detached bracket, gets stuck between the 

MLG main fitting and wing lower skin. This could result in a MLG which will not come 

in the down and locked position during LG extension as reported (see also 

AOF100.166#03). 

The primary factor to the cause of breaking bolt heads has been determined to be the 

incorrect adjustment of the MLG outboard door. 

(4) To prevent breaking of the recessed bolt heads of the operating rod bracket from the 

CFRP MLG outboard door and possible improper locking of the MLG, this Component 

Service Bulletin introduces: 

- a detailed inspection for play or cracks in the recessed bolt heads in Part 1, and 

- a modification to improve the attachment of the operating rod bracket to the CFRP 

 MLG outboard door, in Part 2. 

(5) For spare CFRP MLG outboard doors this Component Service Bulletin (CSB) 

has been issued. 

D. Description 

(1) This Component Service Bulletin is divided in two parts as follows: 

Part 1: The Detailed Inspection of the CFRP MLG outboard door recessed bolt 

 heads. 

This Part tells you how to: 

- Inspect the MLG outboard door for play or cracks in the recessed countersunk 

heads of the operating rod bracket attachment bolts. 
Component Service Bulletin 

Nov 17/11 D13312-52-015 

Page 3 

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. 

Part 2: The Modification of the CFRP MLG outboard door. 

This part tells you how to: 

- Remove the recessed titanium attachment bolts and install oversize tension type 

hiloks on the MLG outboard door to improve the attachment of the operating rod 

bracket. 

E. Compliance 

(1) Part 1: Recommended. 

Fokker Services recommends the accomplishment of Part 1 of this Service Bulletin 

within 9 months after the date of issue of this Service Bulletin. 

NOTE: If Part 2 is accomplished within 9 months after the date of issue of this 

 Service Bulletin, there is no requirement to do Part 1. 

(2) Part 2: Recommended. 

Fokker Services recommends the accomplishment of Part 2 of this Service Bulletin 

within 24 months after the date of issue 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 a Proposed Airworthiness Directive for 

 comments. 

F. Approval 

(1) The technical content of this document is approved under the authority of DOA nr. 

EASA.21J.059. 

G. Manpower 

(1) Approximately 3 man-hours are necessary to do Part 1 of 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 1 1 1 

Modification 

Inspection 1 1 1 

Installation - - - 

Testing - - - 

Total 2 2 
Component Service Bulletin 

D13312-52-015 Nov 17/11 

Page 4 

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. 

NOTE: This estimate does not include the time necessary for the paint to dry 

and/or the sealant to cure. 

(2) Approximately 6 man-hours are necessary to do Part 2 of 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 - - - 

Modification 

Inspection 1 5 5 

Installation - - - 

Testing - - - 

Total 5 5 

NOTE: This estimate does not include the time necessary for the paint to dry 

and/or the sealant to cure. 

(3) The estimated hours are for direct labor done by experienced personnel. They are 

calculated based on the conditions given in CSB-00-001 (Component Service Bulletin 

Introduction, section 2.C., "Manpower"). 

H. Weight and Balance 

(1) Weight change: None. 

I. Electrical Load Data 

(1) Not affected. 

J. Software Accomplishment Instructions 

(1) Not applicable. 

K. References 

(1) Fokker 70/100 Structural Repair Manual (SRM) 

Fokker 70/100 Component Maintenance Manual (CMM) 

Fokker Consumable Material List (CML) 

Fokker 70/100 Configuration Deviation List (CDL) ): 

 - 52-07. 

Fokker 70/100 Service Bulletin (SB): 

 - SBF100-52-080. 

 - SBF100-52-090. 

Fokker Component Service Bulletin (CSB): 

 - D13312-52-009. 
Component Service Bulletin 

Nov 17/11 D13312-52-015 

Page 5 

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. 

Fokker internal reference(s): 

 - ECR 88864. 

 - ECR 015248. 

 - ECR 015742. 

L. Publications Affected 

(1) This SB affects the publications listed below: 

(a) Maintenance Documentation

- Fokker 70/100 Component Maintenance Manual (CMM) 52-82-05 

 NOTE: See attached Manual Change Notification MCNM F100-147. 

(2) Report to Fokker Services that this SB has been carried out on the applicable aircraft. 

Send to Fokker Services the “Reporting Quality Form” of this SB, see last SB page. 

 Note: Completion of this form is not a formal part of accomplishment of the Service 

 Bulletin itself, and hence not a requirement. 

(3) For incorporation of this Component Service Bulletin in your documentation refer to 

CSB-00-001 (Component Service Bulletin Introduction). 

M. Interchangeability or Intermixability of Parts 

(1) For future spare parts supply use these part numbers: 

New Part Number Keyword Old Part Number

D13312-714, issue C. MLG Outboard Door Assembly D13312-702, issue -. 

D13312-715, issue C. MLG Outboard Door Assembly D13312-703, issue -. 

D13312-716, issue C. MLG Outboard Door Assembly D13312-704, issue -. 

D13312-717, issue C. MLG Outboard Door Assembly D13312-705, issue -. 

D13312-718, issue C. MLG Outboard Door Assembly D13312-706, issue -. 

D13312-719, issue C. MLG Outboard Door Assembly D13312-707, issue -. 

D13312-720, issue C. MLG Outboard Door Assembly D13312-708, issue -. 

D13312-721, issue C. MLG Outboard Door Assembly D13312-709, issue -. 

D13312-722, issue C. MLG Outboard Door Assembly D13312-710, issue -. 

D13312-723, issue C. MLG Outboard Door Assembly D13312-711, issue -. 
Component Service Bulletin 

D13312-52-015 Nov 17/11 

Page 6 

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. 

2. Material Information

A. Material – Price and Availability 

(1) You can order the necessary parts as mod kit SB10052090-XU-C. 

(2) You can contact your Fokker Services Account Manager for the price and lead-time of 

this mod kit. 

B. Material Required 

(1) These parts, which are necessary to complete Part 2 of this Component Service 

Bulletin, are not part of the mod kit. 

New Part Number Qty Keyword Info Old Part Number Instructions/

Disposition

PR1436 G-A** * Corrosion Inhibitive 

sealant 

(Fk09-016) - Local source 

 - * Lint-free cloth. (Fk05-044) - Local source 

Methyl Ethyl 

Ketone** 

* Solvent. (Fk11-003) - Local source 

Alodine 1201 * Conversion coating. (Fk13-003D)* - Local source 

NOTES: * Use as much as necessary. 

** Or equivalent. 

(2) These mod kit (SBF10052090-XU-C) parts are necessary to do Part 2 of this 

Component Service Bulletin on a LH and RH MLG outboard door. 

New Part Number Qty Keyword Info Old Part Number Instructions/

Disposition

F0N18-1230-6-7 6 Hilok bolt - F0N2-1611V03-04 Discard 

F0N18-2240-6* 6 Collar - MS21043-3 Discard 

NOTES:* Or equivalent collar F0N18-2240S6. 

C. Tooling – Price and Availability 

(1) Not applicable. 

D. Drawings Required 

(1) Not applicable. 
Component Service Bulletin 

Nov 17/11 D13312-52-015 

Page 7 

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. 

3. Accomplishment Instructions

General: 

These instructions are applicable to the LH and RH MLG outboard door. 

- For CML material number references, refer to “Myfokkerfleet.com/Documentation/CML”. 

- For Standards and Process Manual (SPM) references, refer to 

“Myfokkerfleet.com/Documentation/SPM”. 

- For information on removal and installation of hiloks, refer to the SRM, chapter 51-41-01. 

- For information on removal and installation of bolts, refer to the SRM, chapter 51-43-01. 

- For information on drilling in composite parts, refer to the SRM, chapter 51-22-03. 

- For information on drilling in aluminum parts, refer to the SRM, chapter 51-22-01. 

- For the application of Alodine 1201 (Fk13-003D), refer to the AMM, chapter 51-22-00. 

- For the application of Sealing compound PR1436G-A (Fk09-016) refer to the AMM, 

chapter 51-23-00. 

WARNING: BE CAREFUL WHEN YOU USE THE CONSUMABLE MATERIALS. OBEY 

THE INSTRUCTIONS AND MANUFACTURER'S HEALTH AND SAFETY 

INSTRUCTIONS. 

Part 1: The Detailed Inspection of the CFRP MLG outboard door recessed bolt heads. 

Refer to figure 1. 

A. Inspect the CFRP MLG outboard door for cracks in the recessed bolt heads as follows: 

(1) Put the CFRP MLG outboard door on a solid workbench and clamp the hinge side. 

(2) Remove the paint scheme from the bolt heads, if applicable. 

(3) Apply a controlled load, by hand, to the outer end of the MLG outboard door (i.e in a 

up- and downward direction), and hold the operating rod firmly. 

(4) At the same time inspect, on the outside of the door, whether there is free play 

between the countersunk bolt-heads and the external metal reinforcement plate 

and/or whether there are cracks in the bolt heads. 

(5) If there is doubt about the countersunk bolt heads, remove the bolts one-by-one for a 

more closer inspection and re-install them, when no cracks are found, in accordance 

with CMM chapter 52-82-05 and SRM chapter 51-45-01. 

B. Close the Inspections: 
Component Service Bulletin 

D13312-52-015 Nov 17/11 

Page 8 

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. 

(1) If play or cracks are found in the countersunk bolt heads you have to, before further 

flight: 

- Report your findings to Fokker Services BV for a repair and/or continued 

 revenue operation approval. The address to send your report to is given in 

 SBF100-00-001 (Service Bulletin Introduction, Revision 6, Chapter 5). 

 or

- Replace the cracked bolts by new ones 

 or

- Accomplish Part 2 of this Component Service Bulletin. 

(2) Remove the CFRP MLG outboard door from the workbench. 

 
Component Service Bulletin 

Nov 17/11 D13312-52-015 

Page 9 

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. 

Part 2: The Modification of the CFRP MLG outboard door. 

NOTE: ref. mod kit SB10052090-XU-C 

Refer to figure 1. 

A. Remove and discard the attachment bolts, nuts and washers of the operating rod bracket 

to the MLG door skin, items 270, 280 and 290. Keep the operating rod bracket (item 250). 

B. Install 1/64 inch oversize tension type hiloks in stead of bolts F0N2-1611V03: 

(1) Ream the three (3) attachment holes in the reinforced CFRP MLG outboard door and 

the operating rod bracket up to accommodate 1/64 inch oversize hiloks from 0.1900 

H11 to 0.1995 inch H11 (= 0.1995 - 0.2025 inch). Refer to the SRM, chapter 51-41-

01. 

(2) Clean the reamed holes in the reinforced CFRP MLG outboard door and the 

operating rod bracket thoroughly. Use: 

- Methyl Ethyl Ketone Solvent (material no. Fk11-003, or equivalent). 

- Lint-free cloth (material no. Fk05-044). 

(3) Deburr the holes of the internal reinforcement plate in the reinforced CFRP MLG 

outboard door and of the operating rod bracket and apply surface protection 

treatment to the reinforcement plate and bracket holes. Use: 

- Conversion coating Alodine 1201 (material no. Fk13-003D). 

(4) Install the operating rod bracket with the three (3) oversize tension type hiloks with 

sealant, refer to SRM chapter 51-41-01. Adjust the countersinking in the CFRP MLG 

outboard door slightly if necessary to let the hilok heads be completely flush with the 

door. Use: 

- 3 Hilok bolts pn F0N18-1230-6-7. 

- 3 Collars pn F0N18-2240-6. 

- AR sealant PR1436G-A (material no. Fk09-016). 

NOTE: hilok-collars pn F0N18-2240S6 may also be used as alternative. 

C. Re-identify the outboard MLG door with the new part number (-7xx) as listed in 

section/step 1.M (“Interchangeability or Intermixability of Parts”), by mechanical engraving 

on the existing identification plate. 

 

 
Component Service Bulletin 

D13312-52-015 Nov 17/11 

Page 10 

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. 

The Inspection of the Attachment Bolt Heads of the CFRP MLG Outboard Door. 

Figure 1. 

280 

Remove the paint scheme and 

inspect the recess in the three (3) 

countersunk bolt heads for 

movement and/or cracks. 

Apply a controlled 

load, by hand, to the 

outer end of the MLG 

outboard door 

View A

A 

290 

270 

250 
Component Service Bulletin 

Nov 17/11 D13312-52-015 

Page 11 

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. 

Service Bulletin Reporting Quality Form 

Use this Service Bulletin Reporting Quality Form to tell us your perception of the quality of the Service 

Bulletin. The reported data that you provide to us will be used to analyze areas of difficulties and to take 

corrective actions to further improve the quality of our Service Bulletins. 

We thank you for the time you have taken in completing this form. 

Note: Completion of this form is not a formal part of accomplishment of the Service Bulletin itself, and hence 

not a requirement. 

* Rate the scale of 1 to 4, with 1 the lowest score and 4 the highest score. 

Chapters * 1 2 3 4 

a) Quality rating of this SB (overall) □ □ □ □

b) Quality rating of the Planning Information □ □ □ □

c) Quality rating of the Material Information □ □ □ □

d) Quality rating of the Accomplishment Instructions □ □ □ □

e) Quality rating of the Test Instructions (if applicable) □ □ □ □

f) Quality rating of the Illustrations or Drawings (if applicable) □ □ □ □

g) Timely delivery of the SB □ □ □ □

If you have had difficulties with one of the chapters of this Service Bulletin and/or one of your rating(s) is 

lower than 3, please give a short description of the issue. 

Comments:

Operator: Date:

Name / Title: 

Please return this form to: Fokker Services B.V. Fokker Services B.V. (from 1-12-2011). 

Technical Services, Technical Services, 

Quality Department Quality Department 

P.O. box 231 P.O. Box 1357 

2150 AE Nieuw-Vennep 2130 EL Hoofddorp 

The Netherlands The Netherlands 

Fax: +31 (0) 252 627211 +31 (0) 88 6280 211 

 or Email : technicalservices@fokker.com.