## Service Bulletin Fokker Services B.V.

Prepared Function / Note Date jeffrey.keetlaer Oct 24/14 Colleague Check doesburg-jd01812 Oct 24/14 Manager Final Approval aroon.siriphant Nov 11/14 Office of Airworthiness Approval visser-hv01800 Nov 12/14

Status: Released Revision:

- Released date: ( Mmm dd/yy ) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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

SBF100-53-128

Revision -

FUSELAGE - CENTER FUSELAGE

A One-Time Inspection of the Skin Conn ection Angle and Pressure Bulkhead at Station 14911 (12447), Stringer 67 (RH side)

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14



## 1. General Information

A. General

B. Table of Contents

• Section 1: General Information

• Section 2: Planning Information

• Section 3: Material Information

• Section 4: Accomplishment Instructions

• Service Bulletin Quality Reporting Form and attachments (if applicable):

• 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 - Refer to footer First Release 

### FUSELAGE Fuselage Section 2 - A One-time Inspection of the Skin Connection Angle and Pressure Bulkhead at Station 14911 (12447), Stringer 67 (RH side)

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14



## 2. Planning Information A. Effectivity (1) F28 Mark 0070/0100 aircraft serial numbers: 11258, 11272 thru 11286, 11290, 11291, 11293, 11295, 11296, 11300, 11303, 11306 thru 11308, 11310 thru 11316, 11318 and 11320 thru 11585, if exceeding 30.000 FC at the release date of this Service Bulletin.
NOTE : Reportedly aircraft serial numbers 11359, 11367, 11397, 11471, 11499 and 11502 have already been inspected in accordance with the requirements of SBF100-53-128 and can therefore be identified in the aircraft records as post SBF100-53-128. B. Concurrent Requirements (1) Not applicable.
C. Reason (1) Service experience has shown that cracking can occur in the pressure bulkhead webplate and skin connection angle on the RH side at station 14911 (station 12447 for F28 Mark 0070), stringer 67 of aircraft fuselage section 2 before the existing threshold per ALS task 533016-00-03 (F28 Mark 0100) or 533016-01-03 (F28 Mark 0070). Therefore an additional one-time inspection is required to investigate if cracks have occurred on the pressure bulkhead webplate and/or skin connection angle. (2) This Service Bulletin provides flyable crack limits and refers to applicable repair instructions per Service Bulletin SBF100-53-129, if necessary. D. Description (1) This Service Bulletin tells you how to: - Gain access to the aft side/outside of the RH pressure bulkhead webplate and skin connection angle. - Inspect the pressure bulkhead webplate and skin connection angle for cracks - Report finding (paragraph 4. E. (2)) - Repair, if applicable, in accordance with SBF100-53-129 - Close up the work area.

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14 

### E. Compliance (1) Recommended Fokker Services recommends the accomplishment of this Service Bulletin only for aircraft exceeding 30.000 FC at the release date of this Service Bulletin as follows:
- Within 2000 FC from the release date of this Service Bulletin for aircraft with less than 40.000 FC at the release date of this Service Bulletin. - Within 750 FC from the release date of this Service Bulletin for aircraft with 40.000 FC or more at the release 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 a (Proposed) Airworthiness Directive for comments. F. Approval (1) The technical content of this document is approved under the authority of DOA ref. EASA.21J.059. G. Manpower (1) Approximately 1 man-hours are nece ssary to do this Service Bulletin on one aircraft. This table of manpower will help you to schedule and do this Service Bulletin:
Elapsed time (hours) Removal - - - Modification Inspection Installation - -

- Testing - -

- Total 1.0 1.0 1.0 Instructions Men Man-hours

1 1.0



### NOTE : This estimate does not include the time necessary to open the access panel and (if required) to remove the wing to fuselage fairing. (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”).

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14 

### H. Weight and Balance (1) Weight change: None. Index change: None.
I. Electrical Load Data (1) Direct Current (DC) Loads: (a) Not changed. (2) Alternating Current (AC) Loads: (a) Not changed. J. Software Accomplishment Summary (1) Not applicable.
K. References (1) Fokker 70/100 Aircraft Maintenance Manual (AMM) Fokker 100 Service Bulletin (SB): - SBF100-53-129 (to be issued).

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14 

### 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. (2) Report to Fokker Services that this Service Bulletin has been carried out on the applicable 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. M. Interchangeability or Intermixability of Parts (1) Not applicable.

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14



## 3. Material Information
A. Material – Price and Availability (1) Not applicable. B. Material Required (1) Not applicable. C. Tooling – Price and Availability (1) Not applicable. D. Tooling Required (1) Not applicable.

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14



## 4. Accomplishment Instructions

A. Clear the area around the lower wing to fuselage section on the RH side. B. Put the access platform 1 m (3 ft) in position near the access panel 178BR. C. Open access panel 178BR D. If necessary, clean the inspection area and the items to be inspected. Refer to figures 1, 2 and 3 E. Perform a detailed inspection of the pressure bulkhead web plate and skin connection angle at station 14911(station 12447 for F28 Mark 0070), adjacent to the stringers 66/67 from the aft side. (1) Use an inspection lamp and magnifying glass to inspect the pressure bulkhead web plate and skin connection angle adjacent to the stringers 66/67 for signs of cracks and/or damage, see figures 1, 2 and 3.

(2) Send an inspection report to the Technical Services Department of Fokker Services B.V. via the knowledge center in the Q&A database on MyFokkerfleet.com or technicalservices@fokker.com . Also report to Fokker Services B.V. when NIL findings are found during the inspection. This report must include: (a) The aircraft serial number, (b) The total number of flight cycles and flight hours of the aircraft, (c) A sketch or photo’s to show the location of the crack(s) and/or damaged part(s), if applicable, (d) The length of each crack, if applicable.
NOTE : Every inspection result must be reported to Fokker Services B.V. even when no cracks are found. F. In case cracks are found during the inspection described in the previous steps, the following flyable crack limits are applicable: (1) In case the skin connection angle (longeron) is cracked, but the pressure bulkhead webplate is not cracked, a repair must be performed per SBF100-53-129 at the next convenient opportunity but within 4000 FC, whichever comes first.

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14 

### (2) In case a crack is found in the pressure bulkhead webplate (with or without a crack in the skin connection angle (longeron)) which does not reach the vertical stiffener (BL800R), the crack must be stop-drilled and re-inspected after 2000 FC. If no crack growth beyond the stop drill hole is found after 2000 FC, it must be repaired per SBF100-53-129 at the next C-check or within 4000 FC after crack detection, whichever comes first. (3) In case the crack has reached the vertical stiffener (BL800R) or if crack growth beyond the stop drill hole is found after 2000FC (ref. step (2) above), a repair must be performed in accordance with SBF100-53-129 before further flight or contact Fokker Services B.V. for an analysis and possible repair postponement based on the crack finding. (a) In case such a request is sent to Fokker Services, it is necessary to remove the forward wing-to-fuselage body fairing in accordance with AMM 53-63-00- 000-824-A. Inspect the skin connection angle from the external side of the aircraft behind the forward wing-to-fuselage body fairing attachment profile. Also inspect the fuselage skin and skin strip for cracks emanating from below the attachment profile just below stringer 67. See figures 4 and 5 for an indication of the crack location. G. Job close-up (1) Close access panel 178BR and install fairing panel 168AR (if removed) according AMM task 53-63-00-400-824-A. (2) Remove all tools, materials and equipment from the work area. Make sure that the area is clean.Status: Released Security c RESTRI C

Copyright A ll rights Reproduction or dis c with the prior writte n c lass: C TED

reserved by Fokker Se r c losure to third parties o f n permission of Fokker S e r vices B.V. (The Netherl a f this document or any p a e rvices B.V.



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Page 9 of 1 4 e ment. except 4

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14 

### Figure 2 – Overview of crack location (RH side) Crack location in pressure bulkhead webplate and skin connection angle. 

### View in DOF

Existing fairing frame repair per SRM 53-80-02 repair number 7 Webplate of Frame 14911 (12447)

Stringer 67 Stringer 66 Center wing lower skin

Vertical stiffener BL800R

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14 

### Figure 3 – Close up of crack location (RH side) Pressure bulkhead webplate crack

Skin connection angle crack 

### View in DOF The webplate on the rear side of frame 14911 (12477)

Vertical stiffener BL800R

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 12 of 14 

### Figure 4 – Overview of skin connection angle crack location (RH Side) Close-up view figure 5 View Z4 Stringer 66

Stringer 67

Crack

## Service Bulletin Fokker Services B.V.

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14 

### Figure 5 – Close-up of skin connection angle crack location (RH Side) V iew Z4

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

Status: Released Revision:

- Released date: (Mmm dd/yy) Nov 12/14 Security class: RESTRICTED F100/70 Generic SB no.: SBF100-53-128

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 14 of 14



### SB Title: A One-Time Inspection of the Skin Connection Angle and Pressure Bulkhead at Station 14911 (12447), Stringer 67 (RH side)
Use this Service Bulletin Quality Reporting 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. Engineering, Quality Department P.O. Box 1357 2130 EL Hoofddorp The Netherlands Fax: +31 (0) 88 6280111 or E-mail: technicalservices@fokker.com