Service Bulletin 

Fokker F28 

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 allowed by the aforesaid agreement, is not permitted 

except with the prior written permission of Fokker Services B.V. 

Jun 23/10 SBF28-28-049 

Page 1 

1. Planning Information

A. Effectivity 

(1) F28 Mk 1000/2000/3000/4000(C) aircraft serial numbers: 

11003 thru 11241, 11991 and 11992. 

(2) Production version of this modification: Not applicable. 

B. Concurrent Requirements 

(1) Not applicable. 

C. Reason 

(1) The design review of the F28 Mk 1000/2000/3000/4000(C) fuel system in accordance 

with the guidelines related to FAA SFAR 88 and JAA INT/POL/25/12 revealed that an 

unsafe condition can develop in the wing tanks. 

(2) Under certain failure conditions of the Collector Tank Level Float Switch wiring a short 

circuit may develop. Such a short circuit may result in an ignition source in the wing 

tank vapour space. 

(3) The fuse, packed in a jiffy junction will limit the current and thus prevent this ignition 

source in the wing tank vapour space. 

Page 1 2 3 4 5 6 7 

Revision - - - - - - - 

Attachments 2 Drawing sheets. For a detailed listing refer to page 5. 

FUEL

“This Service Bulletin is associated with the Fuel Tank Safety Program” 

Tank Fueling / De-fueling - The Introduction of a Fuse in the Collector Tank Level Float 

 Switch Wiring 
Service Bulletin 

Fokker F28 

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 allowed by the aforesaid agreement, is not permitted 

except with the prior written permission of Fokker Services B.V. 

SBF28-28-049 Jun 23/10 

Page 2 

D. Description 

(1) This Service Bulletin tells you how to: 

- Install the jiffy junctions. 

- Perform system functional tests. 

E. Compliance 

(1) Recommended. 

Fokker Services recommends the accomplishment of this Service Bulletin within 2 

years after the date of issue of this Service Bulletin. 

NOTE: It is expected that EASA will issue an Airworthiness Directive with respect to 

this subject with the same compliance terms. Refer to the EASA website for 

publication of a Proposed Airworthiness Directive for comments. 

F. Approval 

(1) The technical content of this document is approved by EASA or under the authority of 

DOA nr. EASA.21J.059. 

G. Manpower 

(1) Approximately 5 man-hours are necessary to do 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 2 2 1 

Installation 2 2 1 

Testing 1 1 1 

Total 5 3 

NOTE: This estimate does not include the time necessary for the paint to dry 

 and/or the sealant to cure. 

(2) The estimated hours are for direct labor done by experienced personnel. They are 

calculated based on the conditions given in the SBF28-00-001 (Service Bulletin 

Introduction, section 2.C., "Manpower"). 
Service Bulletin 

Fokker F28 

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 allowed by the aforesaid agreement, is not permitted 

except with the prior written permission of Fokker Services B.V. 

Jun 23/10 SBF28-28-049 

Page 3 

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) 

F28 Wiring Diagram Manual (WDM) 

Fokker Consumable Material List (CML) 

Fokker drawing(s): refer to page 5 

Fokker internal reference(s): 

 - ECR 15105. 

L. Publications Affected 

(1) This SB affects the publications listed below: 

(a) Maintenance Documentation

- F28 Wiring Diagram Manual (WDM) - chapter 28-45 

- F28 Maintenance Manual (MM) - chapter 28-45 

NOTE: See attached Manual Change Notification MCNM F28-035. 

(b) Maintenance Programs

Not affected. 
Service Bulletin 

Fokker F28 

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 allowed by the aforesaid agreement, is not permitted 

except with the prior written permission of Fokker Services B.V. 

SBF28-28-049 Jun 23/10 

Page 4 

(c) Special Instructions for Continued Airworthiness (ICA)

The effect of this Service Bulletin on the special ICA is as follows: 

 YES NO 

- Fuel Tank Safety (FTS) X - 

NOTE: The fuel CDCCL item as specified below shall be followed and 

incorporated in the approved aircraft maintenance program documents. 

CDCCL: It shall be assured that the over-current protection fuses (electronic 

in-line junction with integral fuse) in the wiring to the level float 

switches, located close to the point where the wiring goes into the 

tank, are installed. 

Affected part number W48006-403. 

NOTE: The verification shall be performed in accordance with the 

Standard Practices applicable for the installation of this 

component as described in the Wiring Manual and/or in 

accordance with the instructions in the AMM, changed in 

accordance with the instructions in the attached 

MCNM F28-035. 

(d) Operational Documentation

Not affected. 

(2) 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"). 

M. Interchangeability or Intermixability of Parts 

(1) Not applicable. 
Service Bulletin 

Fokker F28 

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 allowed by the aforesaid agreement, is not permitted 

except with the prior written permission of Fokker Services B.V. 

Jun 23/10 SBF28-28-049 

Page 5 

2. Material Information

A. Material – Price and Availability 

(1) You can order the necessary parts as mod kit SB2828049-XU-A. 

(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 this Service Bulletin on 1 aircraft, are 

not part of the mod kit. 

New Part Number Qty Keyword Info Old Part Number Instructions/ 

Disposition

22 DR * Tape, Lacing Fk05-090(A)** - Local Source

M81824-1-1 2 Splice FC400 - - 

NOTE: * Use as much as necessary. 

** Refer to the CML for material numbers. 

(2) These parts are necessary to do this Service Bulletin on 1 aircraft. 

New Part Number Qty Keyword Info Old Part Number Instructions/ 

Disposition

W48006-403 2 Fuse, Jiffy 

Junction 

0.25 Amp - - 

F0N1-3613-24-4 1m* Sleeve - - - 

W58048-401 1 Cableloom - - - 

NOTE: * Use as much as necessary, put remaining material into storage. 

C. Tooling – Price and Availability 

(1) Not applicable. 

D. Drawings Required 

(1) These drawings are necessary to do this Service Bulletin: 

Drawing Sheet Issue Size Description Aircraft Effectivity

W57273 002 C A3 RF WD Collector Tank Level Warning All 

W58048 001 - A4 Cableloom Connectionlist All 
Service Bulletin 

Fokker F28 

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 allowed by the aforesaid agreement, is not permitted 

except with the prior written permission of Fokker Services B.V. 

SBF28-28-049 Jun 23/10 

Page 6 

3. Accomplishment Instructions

General 

- For CML material number references, refer to “Myfokkerfleet.com/documentation/CML”. 

- For the finish codes, refer to “Myfokkerfleet.com/documentation/FC” 

- Cut the new wires to the correct length where necessary. 

- Loosen the cable clamps where necessary. 

- Remove and discard the cable ties where necessary. 

- Refer to the WDM, chapter 20, for the removal and installation of the wires. 

A. The Job Set-Up. 

(1) Remove all electrical power (refer to the MM, chapter 24-00). 

(2) Put up warning signs to tell persons: 

"DO NOT CONNECT THE ELECTRICAL POWER" 

"DO NOT CONNECT THE BATTERIES". 

B. Get access to the collector tank wiring in zones 731 and 741. Open the panels (81J and 

82J) necessary to gain access. 

Refer to drawing W57273 sheet 002. 

C. Rework of wiring outside the LH Fuel Tank. 

(1) Remove the splice between wire WR1D22-NA1 and the float switch wire. 

(2) Install and identify the jiffy junction. Use: 

- 1 wire (WR1E22) ref cableloom W58048-401 

- 1 fuse, jiffy junction (WR93-731) pn W48006-403 

- 1 splice pn M81824-1-1 (FC400) 

- AR tape, lacing pn Fk05-090(A) 

- AR sleeve, identification* pn F0N1-3613-24-4. 

NOTE: Write “WR93-731” on the identification sleeve. 

Do not shrink the sleeve. 
Service Bulletin 

Fokker F28 

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 allowed by the aforesaid agreement, is not permitted 

except with the prior written permission of Fokker Services B.V. 

Jun 23/10 SBF28-28-049 

Page 7 

D. Rework of wiring outside the RH Fuel Tank. 

(1) Remove the splice in the wire 2WR1D22-NA2 and the float switch wire. 

(2) Install and identify the jiffy junction. Use: 

- 1 wire (2WR1E22) ref cableloom W58048-401 

- 1 fuse, jiffy junction (2WR93-741) pn W48006-403 

- 1 splice pn M81824-1-1 (FC400) 

- AR tape, lacing pn Fk05-090(A) 

- AR sleeve, identification* pn F0N1-3613-24-4. 

NOTE: Write “2WR93-741” on the identification sleeve. 

Do not shrink the sleeve. 

E. Restore electrical power. 

(1) Remove the warning signs to tell persons: 

"DO NOT CONNECT THE ELECTRICAL POWER" 

"DO NOT CONNECT THE BATTERIES". 

(2) Install all electrical power (refer to the MM, chapter 24-00). 

F. Do the following operational test to verify correct operation: 

(1) Collector Tank Low Level Warning Test (refer to the MM, chapter 28-45-01). 

G. Close the panels you opened in step B. 

H. Remove all tools, materials, and equipment from the work area. Make sure the area is 

clean. 

FOKKER SERVICES B.V.

ENGINEERING DEPARTMENT

CABLELOOM CONNECTIONLIST

PART NUMBER PART NAME EQUIVALENT DWG NR : W58048

El. Cable

DASH NR : -401

ISSUE : -

SHEET : 1

DATE : 10-04-29

FROM CABLE LENGTH TO WD DRAWING

EQUIPNR CNT FC NUMBER SEP TYP GG mm EQUIPNR CNT FC NUMBER REFERENCE

WR1E22 1 NK 22 500 W57273 W58048-401-

2WR1E22 2 NK 22 500 W57273 W58048-401-

QTY

F0N9-1780NK22 01316-95003 A.R.
Manual Change Notification – Maintenance Documentation 

Fokker 28 

JUN 23/10 MCNM F28-035 

Page 1 of 2 

MCNM-F28-035 

Subject : Fuel – Introduction of Fuses in the Wiring of the Collector-Tank Level Float 

Switch. 

Reason : This MCN is issued to provide you with the changes on the content(s) of the 

affected manual(s), due to the introduction of SBF28-28-049. 

Effectivity : Refer to SBF28-28-049. 

 

Compliance : Once you have determined the applicability of this MCN for one or more of your 

aircraft, incorporate this information into the applicable manual(s). 

Publications 

affected : The Maintenance Manual (MM) 

 The Wiring Diagram Manual (WDM). 

Change Note : MM

NOTE: Make sure that your manual contains the contents of MCNM F28-023, 

before you incorporate this MCNM. 

Update 28-45-01 pageblock 401, or if applicable, update Temporary Revision 

No. 28-32, as follows: 

- In 3. Removal/Installation, add the following step between the steps 

B.(14) and B.(15), and re-identify the existing steps B.(15) thru B.(21) 

accordingly: 

NOTE: Start of Fuel System CDCCL affected section. 

(15) Do a check of the fuse jiffy-junction assembly 

NOTE: The installation of the fuse jiffy-junction assembly is identified with a 

yellow sleeve at each end. 

(a) Find the installation of the fuse jiffy-junction assembly WR93-731 or 

2WR93-741 between the electrical-wires (Refer to the Wiring Diagram 

Manual 28-45-00 for more data). 

(b) Make sure that the installation of the fuse jiffy-junction assembly is in 

good condition and not damaged. 

(c) Make sure that the partnumber W48006-403 is clearly shown on the fuse 

jiffy-junction assembly. 

NOTE: End of Fuel System CDCCL affected section. 
Manual Change Notification – Maintenance Documentation 

Fokker 28 

JUN 23/10 MCNM F28-035 

Page 2 of 2 

If your manual contains Temporary Revision No. 28-56 after 28-45-00 pageblock 

401, then remove and discard this document from your manual. 

In 28-45-00 pageblock 001, add the following paragraph to 1.Description: 

- There are fuse jiffy-junction assemblies installed in the electrical-wiring of 

the float switches, between the wing rear-spar and the main tank, in zone 

810 and 820. The fuses prevent that a short-circuit in the electricalinstallation of a float switch can result in an ignition-source in the collector 

tank. 

 WDM

 Update Chapter 28-45-00, in accordance with the drawings as given in SBF28-

28-049, paragraph 2.D.). 

NOTE: If you have a Continued Airworthiness Documentation Service with Fokker Services, this 

MCN will be included into your manuals, at the earliest opportunity.