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

Service Bulletin 

Fokker F28 

Main Wing Tank- The introduction of Sealant 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 of the 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 of the attachment of the 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 disclosure 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 with the prior written permission of Fokker Services B.V. 
Service Bulletin 

Fokker F28 

(3) This Service Bulletin introduces measures to ensure the correct locking of the 

attachment nuts of the 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 of this 

Service Bulletin, the inspection on minimum clearance, inside the tank, between 

the wiring of the FQTU's and surrounding structure, for PRE SBF28-57 -098 

configuration, is covered per instruction as specified in paragraph 3.E.(2) of this 

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 of this 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 of the FQTU's and surrounding structure. 

E. Compliance 

( 1 ) Recommended . 

Fokker Services recommends the accomplishment of this Service Bulletin within 7 

years after the original issue date of this 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 of a 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 prior written permission of Fokker Services B.V. 
F. Approval 

Service Bulletin 

Fokker F28 

(1) The technical content of this document is approved under the 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, if applicable 

(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 except with the prior written 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 of this 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 of the 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 of this 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 of this SB is only complete with incorporation of the 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 of the 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 if the 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 of each FQTU on the adjacent tank structure. 

NOTE: Marking of the position is NOT required if the 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: If the 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) If the aircraft is PRE SBF28-57 -098, check on minimum clearances between the 

FQTU's and surrounding structure, as detailed below: 

(a) On the inside of the fuel tank measure the distance at any part of the 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) If the 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) If the gap on any of the inspected positions is less than 3 mm (0.12 inch), rework 

of the 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 

!TYPIC AU 

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 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. 

*R ate t e h sea eo f1 to 4 , Wit ' h1 the lowest score an d 4 h t e h' 1g1 h est score. 

Chapters* 1 2 3 4 

a) Quality rating of this SB (overall) 0 0 0 0 

b) Quality rating of the Planning Information 0 0 0 0 

c) Quality rating of the Material Information 0 0 0 0 

d) Quality rating of the Accomplishment Instructions 0 0 0 0 

e) Quality rating of the Test Instructions (if applicable) 0 0 0 0 

f) Quality rating of the Illustrations or Drawings (if applicable) 0 0 0 0 

g) Timely delivery of the SB 0 0 0 0 

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 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.