## 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 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. 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 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. 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 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. 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 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. 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 giv en 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 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. 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 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. 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 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. 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 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. (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 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. 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 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. 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 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. 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 improv e 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

.