### "This Service Bulletin is associated with the Fuel Tank Safety Program" 

### Service Bulletin Fokker F28

Main Wing Tank- The introduction ofSealant on attachment Nuts, Washers and Stud ends of the Fuel Quantity Tank Units (FQTU). 1 . Planning Information A. Effectivity (1) F28 Mk1 000/2000/3000/4000(C) aircraft serial numbers: 11003 thru 11241 11991 and 11992 B. Concurrent Requirements (1) At the same time as you do this SB, it is convenient to do :

- SBF28-57-098 - WINGS - Outer Wing- Rework ofthe Holes in the Outer Wing Upper Skin Panel Reinforcement Structure for the Outer Wing Fuel Quantity Tank Units. C. Reason (1) The design review of the F28 Mk1 000/2000/3000/4000(C) fuel system in accordance with the guidelines related to FAA SFAR 88 and JAA INT/POL/25/12 revealed that an unsafe condition may develop in the wing fuel tanks. (2) Based on the F28 Mk1000/2000/3000/4000(C) Fuel Tank Safety related design review it was concluded that insufficient measures were taken to ensure the correct locking ofthe attachment ofthe Fuel Quantity Tank Units (FQTU's). When a FQTU becomes loose this could lead to insufficient clearance between the FQTU's and adjacent tank structure or other metal parts, and, under certain conditions, in an ignition source inside the wing fuel tanks. Page 1 2 3 4 Revision 1 1 1 1 Attachments

Jun 30/10 Revision 1, Jan 09/14 5 

### 6 7 1 1 1 8 9 1 1 Not applicable SBF28-28-054 Page 1 Copyright All rights reserved by Fokker Services B.V. (The Nether1ands). This document has been supplied by Fokker Services B.V. to its customers on a confidential basis subfect to the provisions of an agreement Reproduction or d isclosure to thifd parties of this document or any part thereof, or the use of any Information contained therein for purposes other than expliciUy aloYied by the aforesaid agreement Is not permitted except withthe prior written permission of Fokker Services B.V.

### Service Bulletin Fokker F28 (3) This Service Bulletin introduces measures to ensure the correct locking ofthe attachment nuts ofthe FQTU's. (4) When this Revision 1 of SBF28-28-054 has been accomplished, the aircraft is also POST SBF28-57-097. (5) A similar ignition source cannot develop in center wing bag tanks because the FQTU is isolated from the tank structure and other metal parts by rubber bags. Reason for Revision (1) This revision is made to:

- Replace the Fuel All's and CDCCL's in paragraph 1.L.(1)(c) by a reference to SBF28-28-050, Remove the one-time inspection on the clearance between the FQTU's and the adjacent structure, or other metal parts. This is now covered by Fuel All 280000-01 in SBF28-28-050, Remove SBF28-57-097 as a concurrent requirement. In this revision 1 ofthis Service Bulletin, the inspection on minimum clearance, inside the tank, between the wiring ofthe FQTU's and surrounding structure, for PRE SBF28-57-098 configuration, is covered per instruction as specified in paragraph 3.E.(2) ofthis Service Bulletin,

- Add, for convenience, that it is recommended to accomplish SBF28-57-098 concurrently. NOTE: Although title and contents have been changed, no additional action is required when the original issue ofthis Service Bulletin was already accomplished. D. Description (1) This Service Bulletin tells you how to:

- Apply sealant covering the nuts, washers and stud ends at the FQTU attachments.

- For PRE SBF28-57-098 configuration, perform an inspection on minimum clearance between the wiring ofthe FQTU's and surrounding structure. E. Compliance ( 1 ) Recommended . Fokker Services recommends the accomplishment ofthis Service Bulletin within 7 years after the original issue date ofthis Service Bulletin . NOTE:

SBF28-28-054 Page2 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 ofa Proposed Airworthiness Directive for comments. Jun 30/10 Revision 1 , Jan 09/14 Copyright All rights reserved by Fokker Services B.V. (The Nethertands). This document has been supplied by Fokker Services B.V . to tts etsstomers on a confidential basis

**su~** 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 priorwritten permission of Fokker Services B.V.F. Approval 

### Service Bulletin Fokker F28

(1) The technical content ofthis document is approved underthe authority of DOA ref. EASA.21J.059. G. Manpower (1) Approximately 6 man-hours are necessary to do this Service Bulletin on 1 aircraft. The table of manpower will help you to schedule and do this Service Bulletin:

Instructions Men Man-hours Elapsed time (hours) Removal Modification 

# } 2 

### 6 3 Inspection Installation Testing Total 

### 6 3 NOTE: This estimate does not include the time necessary for the paint to dry and the sealant to cure and for opening and closing the tanks, ifapplicable (ref. accomplishment instruction paragraph 3.E.(2)). (2) The estimated hours are for direct labor done by experienced personnel. They are calculated based on the conditions given in SBF28-00-001 (Service Bulletin Introduction, section 2.C., "Manpower"). H. Weight and Balance (1) Weight change: None Index change: None. I. Electrical Load Data (1) Not affected . J. Software Accomplishment Instructions (1) Not applicable. K. References (1) F28 Maintenance Manual (MM) Service Bulletin SBF28-28-050 Service Bulletin SBF28-57-097 Service Bulletin SBF28-57-098 Jun 30/10 Revision 1 , Jan 09/14 SBF28-28-054 Page 3 Copyright All rights reserved by Fokker Services B.V. (The Nethertands). This document has been supplied by Fokker SeMces B.V. to "s customers on a confidential basis subject to the provisions of an agraemenl Reproduction or disclosure to thlf'd parties of this document or any part thereof. or the use of any information contained therein for purposes other than explicitly alowed by the aforesaid agreement, Is l'lOt permitted exceptwith the priorwritten permission of Fokker Services B.V.

### Service Bulletin Fokker F28 Fokker internal reference(s):

- ECR 15105. L. Publications Affected (1) This SB affects the publications listed below: (a) Maintenance Documentation F28 Maintenance Manual (MM) - chapter 28-41 NOTE: See attached Manual Change Notification MCNM F28-037. (b) Maintenance Programs F28 Customized Maintenance Program (CMP). NOTE: The affected maintenance program change is described in the paragraph Maintenance Programs of Service Bulletin SBF28-28-050. (c) Special Instructions for Continued Airworthiness (ICA) The effect ofthis Service Bulletin on the special ICA is as follows: YES

- Electrical Wiring Interconnection System (EWIS)

- Fuel Tank Safety (FTS) X NO X The fuel All 280000-05 and CDCCL item 1.2b, as specified in Revision 2 (or subsequent) of SBF28-28-050, are applicable. The contents ofthe affected manual(s) shall be revised in accordance with MCNM F28-037. (d) Operational Documentation Not affected. (2) Report to Fokker Services that this SB 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 SB page. ( 4) For incorporation ofthis Service Bulletin in your documentation refer to SBF28-00-001 (Service Bulletin Introduction , section 4 "Incorporation of Service Bulletins in Documentation of Fokker Services"). (5) Accomplishment ofthis SB is only complete with incorporation ofthe manual change(s), per MCNM F27-037, Temporary Revision or General Revision . SBF28-28-054 Page4 Jun 30/10 Revision 1 , Jan 09/14 Copyright All rights reserved by Fokker Services B.V. (The Nethertands). This document tlas been supplied by Fokker Services B.V. to its customers on a oonflder«ial basis subject to the provisions of an agreement. Reproduction or dlsdosure to third parties of this document or any part thereof, or the use of any Information contained therein for purposes other than e)Cpllcitly allowed by the aforesaid agreement. Is not permitted except INith the prior written permission of Fokker Services B.V.M. Interchangeability or lntermixability of Parts (1) Not applicable.

2. Material Information A. Material - Price and Availability 

### Service Bulletin Fokker F28

(1) You can order the necessary parts against list price. (2) 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 ofthe mod kit. New Part Number PR 1422B** NOTES: Keyword Old Part Number 

### * Sealant * Use as much as necessary ** Or equivalent alternative in accordance with NTO 262. Instructions/ Disposition 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.

Jun 30/10 Revision 1 , Jan 09/14 SBF28-28-054 Page 5 Copyright All rights reserved by Fokker Services B.V. (The Netherlands). Thl$ document has been supplied by Fokker Services B.V. to its ctJstomers on a confidential basis subfect to the provisions of an agreement. Reproduction or disclosure to third parties of this document or any part thereof. or the use of any lnfOfTTlatlon contained therein fof purposes other than explicitly allowed by the aforesaid agreement. Is not permitted e11cept with the prior written permission of Fok.ker Services B.V.

### 3. Accomplishment Instructions General

- Instructions are written for the LH wing but are similar for the RH wing. 

## Service Bulletin Fokker F28

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE OPERATOR'S AND MANUFACTURER'S HEALTH AND SAFETY INSTRUCTIONS. WARNING: BEFORE ENTERING FUEL TANKS ENSURE THAT ALL SAFETY PRECAUTIONS DETAILED IN MM CHAPTER 28-11-00 ARE OBSERVED. NOTE: Except ifthe aircraft is already POST SBF28-57-098, this Service Bulletin requires de-fueling, draining and venting of the fuel tanks in accordance with MM chapter 28-11-00. A. Remove the electrical power. (Refer to MM chapter 24-00-00). B. Disconnect the batteries. (Refer to MM chapter 24-00-00). C. Put up warning signs to tell persons: "DO NOT CONNECT THE BATTERY" and "DO NOT CONNECT THE ELECTRICAL POWER". D. Apply a layer of sealant at the self locking nuts, the washers and studs ends of the FQTU's. (1) Mark the installed (clockwise) position ofeach FQTU on the adjacent tank structure. NOTE: Marking ofthe position is NOT required ifthe aircraft is POST SBF28-57-098. (2) Remove the six (6) attachment screws from each FQTU mounting flange. (3) Carefully pull the FQTU from the tank (do not disconnect the electrical wiring from the FQTU) and temporary hold the FQTU in position . Refer to MM chapter 28-41-01 . (4) Apply a layer of sealant at the nuts, washers and stud ends fitted on the three FQTU probe attachments. Refer to figure 1 . E. Close up. (1) Reinstall the FQTU's in the marked (clockwise) position ; refer to MM chapter 28-41-01. NOTE: Ifthe aircraft is POST SBF28-57-098 no marking has been applied and the (clockwise) installation position is not relevant. SBF28-28-054 Page6 Jun 30/10 Revision 1 , Jan 09/14 Copyright All rights resetVed by Fokker Services B.V. (The Nether1ands). This document has been supplied by Fokker Services B.V. to Its customers on a confidential basis subfect 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 alo'Ned by the aforesaid agreement, Is not permitted except with the prior written permission of Fokker Setvices B.V.

### Service Bulletin Fokker F28 (2) Ifthe aircraft is PRE SBF28-57-098, check on minimum clearances between the FQTU 's and surrounding structure, as detailed below: (a) On the inside ofthe fuel tank measure the distance at any part ofthe FQTU between the electrical wiring connections on FQTU no. 1 thru 10 and the reinforcement plate around the FQTU. (b) The FQTU 's 1 thru 9 can be installed in six different orientations. Loosen, remove and keep the screws and repeat step (a) for each orientation in which the FQTU's can be installed. (c) Ifthe gap between the electrical wiring connections and the reinforcement plate with the FQTU (1 thru 1 0) in all possible positions of installation is 3 mm (0.12 inch) or more: install the FQTU in accordance with MM chapter 28-41-01 . Continue with step 3. (d) Ifthe gap on any ofthe inspected positions is less than 3 mm (0.12 inch), rework ofthe reinforcement plates is required in accordance with SBF28-57-097. NOTE: For convenience it is recommended to accomplish SBF28-57-098 instead of SBF28-57-097. (3) Reconnect the batteries. (Refer to MM chapter 24-00-00). (4) Apply electrical power to the aircraft. (Refer to MM chapter 24-00-00). (5) Refuel the aircraft, as required . Refer to MM chapter 12-28-02 or MM chapter 12-28-03. (6) Inspect the tank access panels for leakage.

Jun 30/10 Revision 1 , Jan 09/14 SBF28-28-054 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 alla.ved by the aforesaid agreement, is not permitted except with the prior 'Mitten permission of Fokker Services B.V.Apply sealant (3x)

SBF28-28-054 Page 8 ZONE 730

1. MOUNTING fLANGE

Figure 1 o VIEW 

### A !TYPICAU 

### Service Bulletin Fokker F28

SELF LOCKING NUl APPLY SEALANT

Jun 30/10 Revision 1, Jan 09/14 Copyright Nl rights reserved by Foll:ker Services B.V. (The Nethef1ands). This document has been supplied by Fokker Services B.V. to its customers on a confidential basls subject to the provisions of an agreemenl Reproduction or dlsdosure to third parties of this document or any part thereof, or the use of any lnfonnatlon contained therein for purposes other than explicitly anowed by the aforesaid agreement. is not permitted except with the prior written permission of Fokker Setvlces B.V.

### Service Bulletin Reporting Quality Form 

## Service Bulletin Fokker F28

Use this Service Bulletin Reporting Quality Form to tell us your perception ofthe quality ofthe 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 ofour Service Bulletins. We thank you for the time you have taken in completing this form. *R h ate t e sea eo f1 4 ' h1 to , Wit the lowest score and 4 h h' h t e 1g1 est score. Chapters* 1 2 3 4 a) Quality rating ofthis SB (overall) 0 0 0 0 b) Quality rating ofthe Planning Information 0 0 0 0 c) Quality rating ofthe Material Information 0 0 0 0 d) Quality rating ofthe Accomplishment Instructions 0 0 0 0 e) Quality rating ofthe Test Instructions (if applicable) 0 0 0 0 f) Quality rating ofthe Illustrations or Drawings (if applicable) 0 0 0 0 g) Timely delivery ofthe SB 0 0 0 0 Ifyou have had difficulties with one ofthe chapters ofthis Service Bulletin and/or one ofyour rating(s) is lower than 3, please give a short description ofthe issue. Comments: Operator: Date: Name 

### I Title: Please return this form to:

Jun 30/10 Revision 1, Jan 09/14 

### Fokker Services B.V Technical Services, Quality Department P.O. Box 1357 2130 EL Hoofddorp The Netherlands Fax: +31 (0) 88 6280111 or Email : technicalservices@fokker.com SBF28-28-054 Page 9 Copyright All rights reserved by Fokker Servk:es B.V. (The Netherlands). This document has been supplied by Fokker Services B.V. to its cus!Omen on a confldertlal basis

**su~** 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 expficitly anowed by the aforesaid agreement, Is not permitted except 'Nilh the prior 'Mitten permission of Fokker Services B.V.