## Service Bulletin Fokker Services B.V.

Prepared Function / Note Date jeffrey.keetlaer Feb 11/14 General Check aroon.siriphant S/TFSE Feb 12/14 Manager Final Approval aroon.siriphant S/TFSE Feb 13/14 Office of Airworthiness Approval visser-hv01800 S/TW Feb 13/14

Status: Released Revision: 1 Released date: ( Mmm dd/yy ) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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. EASA approved procedure for electronic sign-off 

# F100/70 Generic SB

SBF100-53-125

Revision 1

FUSELAGE - TAIL SECTION

The Repair of Oblique Frame 67-2 with Strips

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 of 13



## 1. General Information

A. General
(1) Not applicable

B. Table of Contents

• Section 1: General Information

• Section 2: Planning Information

• Section 3: Material Information

• Section 4: Accomplishment Instructions

• Service Bulletin Reporting Quality Form and if applicable attachments:

• List of drawings/parts lists

• Parts List Local source (PLL)

• Parts List Supply (PLS)

• Required drawings
C. Service Bulletin Revision History

Revision Date (Mmm dd/yy) Reason for Revision
- Jan 17/14 First Release 1 Refer to footer Additional clarification concerning the repair applicability added.

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 2 of 13



## 2. Planning Information

A. Effectivity
(1) F28 Mark 0070/0100 aircraft serial number(s): 11244 thru 11585.
B. Concurrent Requirements
(1) Not applicable.

C. Reason
(1) Service experience has shown that cracks can occur in the primary structure of the aircraft at Oblique Frame 67-2 (p/n D37208-001 and/or p/n D37208-002) in the tail section. A one-time inspection has been issued to investigate if cracks have occurred on one or both sides of Oblique Frame 67-2 via SBF100-53-124.
(2) This Service Bulletin provides the repair instructions for cracks in Oblique Frame 67-2, which have been found during the accomplishment of the Service Bulletin SBF100-53-124.
(3) This Service Bulletin can also be used at a later stage to repair cracks in Oblique Frame 67-2, which have been found during the accomplishment of the repetitive inspection which will be included in the Airworthiness Limitations Section (ALS), report SE-623, of the Instructions for Continued Airworthiness.
D. Description
(1) This Service Bulletin tells you how to:
- Gain access to the tail section and Oblique Frame 67-2 - Determine the repair action based on the crack properties - Repair as applicable - Close up the work area.

NOTE : Any repair in accordance with steps G thru L per this Service Bulletin (SBF100-53-125) must be replaced by a repair in accordance with SBF100-53-126 (to be issued) as will be specified in the Airworthiness Limitations Section (ALS), report SE-623, of the Instructions for Continued Airworthiness.
E. Compliance
(1) Optional
F. Approval
(1) The technical content of this document is approved under the authority of DOA ref. EASA.21J.059.

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 3 of 13 

### G. Manpower
(1) Approximately 12 man-hours are necessa ry to do this Service Bulletin on one aircraft.
(2) This table of manpower will help you to schedule and do this Service Bulletin:


### Elapsed time (hours) Removal - - - Modification Inspection Installation 1 4.0 4.0 Testing - - - Total 12.0 12.0 8.0 Instructions Men Man-hours

1 8.0

NOTE 1 : These figures apply for a repair on one side only

NOTE 2 : 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 SBF100-00-001 (Service Bulletin Introduction, section 2.C., “Manpower”).
H. Weight and Balance
(1) For F28 Mark 0070: Weight change: +/- 0,2 kg ( +/- 0.4 lb). Index change: + 0.019.
(2) For F28 Mark 0100: Weight change: +/- 0,2 kg ( +/- 0.4 lb). Index change: + 0.023.

NOTE : These figures apply for a repair on one side only

I. Electrical Load Data
(1) Direct Current (DC) Loads:
(a) Not changed
(2) Alternating Current (AC) Loads:
(a) Not changed

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 4 of 13 

### J. Software Accomplishment Summary
(1) Not applicable.

K. References
(1) Fokker 70/100 Aircraft Maintenance Manual (AMM) Fokker 70/100 Structural Repair Manual (SRM) Fokker Consumable Material List (CML) Fokker Standards & Process Manual (SPM) Fokker 100 Service Bulletin (SB):

- SBF100-53-124 - SBF100-53-126 (to be issued). Fokker internal reference(s): - ECR 016054 - ECR 016055.

L. Publications Affected
(1) This Service Bulletin 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 - Fokker 70/100 Airworthiness Limitations Section (ALS):

• Fuel Tank Safety (FTS) - X

• Damage Tolerance of Fatigue Critical Structure (FCS) - X

• Certification Maintenance Requirements (CMR) - X

NOTE : If “YES”, when not already incorporated, the changed ICA will be incorporated in the MRB, the Airworthiness Limitations Section (ALS) and/or the AMM document(s) within one calendar year from the date of issue of this Service Bulletin. Until then, no actions are required.
(d) Operational Documentation

Not affected.

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 5 of 13 

### (2) Report to Fokker Services that this Service Bulletin has been carried out on the applicable aircraft. Note that the aircraft can only be post this Service Bulletin when both sides have been repaired. Report single side accomplishment in the aircraft administration for awareness concerning the modification status of the aircraft.
(3) You have the possibility to send your SB feedback to Fokker Services per “Service Bulletin Reporting Quality Form”. This form is located on the last Service Bulletin page. (4) 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”).
M. Interchangeability or Intermixability of Parts
(1) Not applicable.

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 6 of 13



## 3. Material Information

A. Material – Price and Availability
(1) Not applicable.
B. Material Required
(1) These parts, which are necessary to complete this Service Bulletin on 1 aircraft on 1 side, are not part of the mod kit.

New Part Number Qty Keyword Info Old Part Number Instructions/ Disposition
Alodine 1201 AR* Conversion liquid Fk13-003D** - Local source Cleaning cloth AR* Cloth, Lint free Fk05-044** - Local source F0N1-4311-3,2 AR* Al. Alloy Sheet 5.322 - - Local source

F0N1-4311 thickness AR* AR* Al. Alloy Sheet 5.322 - - Local source

HL10VF6-6 2 Hi-Lok Bolt F0N2-1196-6-6 - Local source HL10VF6-8 13 Hi-Lok Bolt F0N2-1196-6-8 - Local source HL70-6 15 Hi-Lok Collar F0N2-1181-6 - Local source MEK AR* Solvent, Methyl Ethyl Ketone Fk11-003** - Local source

PR1782B AR* Sealant Fk09-064** - Local source Aerodur S15/60 AR* Primer Fk07-008** - Local source Aerodur C21/100 AR* Topcoat Fk07-027** - Local source



### NOTES : * Use as much as required ** Refer to the CML for material numbers.
C. Tooling – Price and Availability
(1) Not applicable.
D. Tooling Required
(1) The special tool(s), which are necessary to complete this Service Bulletin on 1 aircraft and are not part of the mod kit are described in table below.

Part Number Qty Description 28-0-1219G 1 Speed brake ground-lock bar

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 7 of 13



## 4. Accomplishment Instructions

General:

- In general, use (A)MM chapter 20, standard practices-airframe, as guide line for the

aircraft modification.

- Loosen the cable clamps where necessary.

- For CML material number references refer to “MyFokkerFleet.com > Documentation and

select CML” and/or AMM chapter 20-30-00.

- For Standards and Process Manual (SPM) refe rences refer to “MyFokkerFleet.com >

Documentation and select SPM”.

- For drilling procedures refer to SRM chapter 51-22-01.

- For the application of sealing compound refer to AMM chapter 20-32-00 and chapter 51-

23-00.

- For the installation of Hi-Lok bolts refer to SRM chapter 51-41-01 and/or TH6.3403.

- For the application of Primer & Paint refer to the AMM chapter 51-21-00 and/or TH6.73xx.

- For the application of Alodine refer to AMM chapter 51-22-00 and SRM chapter 51-24-01

and/or TH6.73xx.

WARNING : BE CAREFUL WHEN YOU USE THE CONSUMABLE MATERIALS. OBEY THE INSTRUCTIONS AND MANUFACTURER'S HEALTH AND SAFETY INSTRUCTIONS.
A. Clear the area around the speedbrakes.
Refer to Aircraft Maintenance Manual (AMM)
B. Open and secure the speedbrakes in accordance with AMM Task 53-40-00-210-856-A.
C. Put an access platform under the open speedbrakes and secure the speedbrakes
(1) Install the Speed Brake ground-lock bar tool pn 28-0-1219G.
Refer to figures 1, 2, 3 and the Structure Repair Manual (SRM)
D. Based on the crack properties proceed with step (1), (2) or (3) as applicable.
(1) In case a crack is found in the aft part of the lower boom only (crack length “a” is less than 15 mm), a repair in accordance with steps (G) through (L) has to be carried out within 500 FC under the condition that the crack is stop drilled before further flight in accordance with steps (E) and (F)(1).
(2) In case crack length “a” is more than 15 mm or a crack is found in the vertical web of frame 67-2 with a crack length “b” of less than 15 mm, a repair in accordance with steps (E) through (L) has to be carried out before further flight.
(3) For crack lengths in the vertical web (crack length “b”) exceeding 15 mm, inform Fokker Services for a damage assessment and specific repair instruction before further flight.

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 8 of 13 

### E. Clean the area which requires to be repaired. Use: - AR Cleaning cloth Fk05-044 - AR Methyl Ethyl Ketone Fk11-003.
F. Stop drill the crack to avoid crack growth.
(1) In case a crack is found in the aft part of the lower boom only and crack length “a” is less than 15 mm than the crack must be stop drilled in accordance with SRM 51-70-01. Continue with step (L).
(2) When the crack “a” is longer than 15 mm a stop drill must made as close as possible to the boom horizontally in the vertical web, ref SRM 51-70-01. Continue with step (G).
(3) In case crack “b” is present and the crack length “b” is less than 15 mm than it must be stop drilled in accordance with SRM 51-70-01. Continue with step (G).
Refer to figure 3 and the SRM
G. Determine the thirteen new fastener hole positions in Oblique Frame 67-2 with a pitch of approximately 20-25 mm. Note that three new holes at the bottom side of the web are required between the crack and the existing frame coupling strip.
(1) Drill the thirteen holes in accordance with SRM 51-41-01 to facilitate the Hi-Lok fasteners.

NOTE : The forward side of the lower boom facilitates eight fasteners due to the fact that the aft side has stiffening members which prevents the installation of eight fasteners (thus the forward flange has eight fasteners and aft flange seven fasteners).
H. Prepare the repair strips and shim.
(1) Manufacture two repair strips (-001 and -002) which are long enough to facilitate the in total fifteen fasteners (8x25=200 mm). The repair strips have an edge distance of at least 2D. The repair strips are 45 mm (± 0,5 mm) wide and 3,2 mm thick. Use a corner radius of 8-12 mm and deburr the edges. Use: - AR F0N1-4311-3,2 Al. alloy sheet 5.322.
(2) Manufacture the shim -003 between strip -002 and the existing structure (coupling strip) with appropriate thickness to compensate the height of the first repair strip -001. Refer to figure 3 for the shim location. Use: - AR F0N1-4311 thickness a.r. Al. alloy sheet 5.322.
(3) Copy drill the fastener holes of the Oblique Frame into the repair strips and shim in accordance with SRM 51-41-01.

I. Provide surface treatment to all bare material in accordance with SRM 51-24-01. Use: - AR Alodine 1201 Fk13-003D.

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 9 of 13 

### Refer to Aircraft Maintenance Manual (AMM)
J. Apply paint primer and a topcoat to the repair strips and shim in accordance in accordance with AMM 51-21-00. Use: - AR Aerodur S15/60 Fk07-008 - AR Aerodur C21/100 Fk07-027.
K. Install the repair strips and shim on the Oblique Frame 67-2. Use: - AR PR1782B Fk09-064 - 2 HL10VF6-6 F0N2-1196-6-6 - 13 HL10VF6-8 F0N2-1196-6-8 - 15 HL70-6 F0N2-1181-6.
L. Job close-up
(1) Remove all tools, materials and equipment from the work area. Make sure that the area is clean.
(2) Remove the Speed Brake ground-lock bar tool pn 28-0-1219G.
(3) Remove the access platform from the work area.
(4) Close the speedbrakes in accordance with AMM Task 53-40-00-210-856-A.

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 10 of 13 Section A

- A D.O.F

a b



### Crack identification Oblique Frame 67-2 (LH shown only) Figure 1 A

A

## Service Bulletin Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 11 of 13 

# a b

Crack identification Oblique Frame 67-2 (LH shown) Figure 2Service BulletinFokker Services B.V.Status:ReleasedRevision:1Released date:(Mmm dd/yy)Feb 13/14Security class:RESTRICTEDF100/70 Generic SB no.:SBF100-53-125Copyright 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 anyinformation 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 12 of 13Repair of Oblique Frame 67-2Figure 3Strip -002D.O.F.Shim -003Strip -001Existingcouplingstrip

## Service Bulletin Reporting Quality Form Fokker Services B.V.

Status: Released Revision: 1 Released date: (Mmm dd/yy) Feb 13/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-125

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 13 of 13



### SB Title: The Repair of Oblique Frame 67-2 with Strips

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.
* 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 Illust rations 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. Technical Services, Quality Department P.O. Box 1357 2130 EL Hoofddorp The Netherlands Fax: +31 (0) 88 6280111 or E-mail: technicalservices@fokker.com