Service Bulletin Change Notification 

Fokker 50/60 

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. 

Nov 10/10 Page 1 of 1 

Change this SB as follows: 

Page 9: Change step D.(1) as follows: 

Shut-Off Test refer AMM 28-21-03-400-814, subtask 28-21-03-710-014 steps 

E (1) thru E(21). 

Into: 

Pressure Refueling and Defueling, refer to the AMM, subtask 12-11-01-650-813-A 

steps 7.A.(1) thru (24). 

Reason for change: 

This SBCN is issued to: 

- Correct the reference to the AMM. 

We do not plan to issue a formal SB revision at this moment. If, however, a revision becomes 

necessary, we will also incorporate this SBCN. 

SERVICE BULLETIN CHANGE NOTIFICATION (SBCN) 

SBF50-28-024/REV-/01 

for 

Service Bulletin (SB) SBF50-28-024, revision -, dated Jun 23/10 

FUEL

Tank Fueling / Defueling - The Introduction of a Fuse in the Dual Level Control Pilot Valve 

Wiring 
Service Bulletin 

Fokker 50/60 

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 SBF50-28-024 

Page 1 

1. Planning Information

A. Effectivity 

(1) F27 Mark 050, 0502 and 0604 aircraft serial numbers: 

20103 thru 20335. 

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

B. Concurrent Requirements 

(1) Not applicable. 

C. Reason 

(1) The design review of the F27 Mk 050, 0502 and 0604 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 Dual Level Control Pilot Valve solenoid or in the 

wiring to the solenoid, 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 8 9 

Revision - - - - - - - - - 

Attachments 4 Drawing sheets. For a detailed listing refer to page 6. 

FUEL

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

Tank Fueling / Defueling – The Introduction of a Fuse in the Dual Level Control Pilot Valve Wiring 
Service Bulletin 

Fokker 50/60 

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. 

SBF50-28-024 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 SBF50-00-001 (Service Bulletin 

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

Fokker 50/60 

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 SBF50-28-024 

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) Fokker 50/60 Wiring Manual (WM) 

Fokker 50/60 Aircraft Maintenance Manual (AMM) 

Fokker Consumable Material List (CML) 

Fokker drawing(s): refer to page 6 

Fokker internal reference(s): 

 - ECR 15137 

L. Publications Affected 

(1) This SB affects the publications listed below: 

(a) Maintenance Documentation

- Fokker 50/60 Wiring Manual (WM) - chapter 28-21 

- Fokker 50/60 Aircraft Maintenance Manual (AMM) - chapter 28-21 

- Fokker 50/60 Trouble Shooting Schematics Manual (TSSM). 

NOTE: See attached Manual Change Notification MCNM F50-070. 

(b) Maintenance Programs

- Fokker 50/60 Maintenance Review Board (MRB). 

(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 

- Fuel Tank Safety (FTS) X - 

- Damage Tolerance of Fatigue Critical Structure - X 
Service Bulletin 

Fokker 50/60 

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. 

SBF50-28-024 Jun 23/10 

Page 4 

NOTE: If “YES”, when not already incorporated, the changed ICA will be 

incorporated in the MRB document within one calendar year from the 

date of issue of this Service Bulletin. Until then, the fuel CDCCL item as 

specified below shall be followed. 

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

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

valves, located close to the connector of each solenoid of the level 

control pilot valve, are installed. 

Affected part number DME-F07. 

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 task 

28-21-03-400-814, changed in accordance with the instructions 

in the attached MCNM F50-070. 

(d) Operational Documentation

Not affected. 

(2) For incorporation of this Service Bulletin in your documentation refer to 

SBF50-00-001 (Service Bulletin Introduction, section 4 "Incorporation of Service 

Bulletins in Documentation of Fokker Services"). 

NOTE: Accomplishment of this SB is only complete with incorporation of the manual 

 change(s), per the ref. MCNM, Temporary Revision or General Revision. 

M. Interchangeability or Intermixability of Parts 

(1) Not applicable. 
Service Bulletin 

Fokker 50/60 

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 SBF50-28-024 

Page 5 

2. Material Information

A. Material – Price and Availability 

(1) You can order the necessary parts as mod kits SB5028024-XU-A and 

SB5028024-XU-B. 

(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 

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/ 

 A B Disposition

DME-F07 2 4 Fuse, Jiffy 

Junction 

1 Amp - - 

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

M39029-22-192 4 8 Socket FC652 - - 

M39029-30-217 2 4 Socket FC431 - - 

W7987-520-401 1 - Cableloom - - - 

W7987-520-402 - 1 Cableloom - - - 

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

(3) Applicability of mod kits: 

Qty A (mod kit SB5028024-XU-A) is applicable to do this Service Bulletin on one 

aircraft sn 20103 thru 20108 and 20110 thru 20123 

Qty B (mod kit SB5028024-XU-B) is applicable to do this Service Bulletin on one 

aircraft sn 20109 and 20124 thru 20335. 

C. Tooling – Price and Availability 

(1) Not applicable. 
Service Bulletin 

Fokker 50/60 

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. 

SBF50-28-024 Jun 23/10 

Page 6 

D. Drawings Required 

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

Drawing Sheet Issue Size Description Aircraft Effectivity

W7916-057 006 E A4 RF Wiring Diagram Tank 

Fueling/Defueling 

20103 thru 20108 

20110 thru 20123 

W7916-057 007 E A4 RF Wiring Diagram Tank 

Fueling/Defueling 

20109, 20124 thru 20335

W7987-520 1 - A4 Cableloom 20103 thru 20108 

20110 thru 20123 

W7987-520 2 - A4 Cableloom 20109, 20124 thru 20335
Service Bulletin 

Fokker 50/60 

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 SBF50-28-024 

Page 7 

3. Accomplishment Instructions

General 

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

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

- Loosen the cable clamps where necessary. 

- Remove and discard the cable ties where necessary. 

- For finish codes references, refer to “Myfokkerfleet.com/Documentation/FC". 

- Refer to the WM, chapter 20-13-03, for the removal and installation of the wires. 

A. The Job Set-Up. 

(1) Remove all electrical power (Refer to the AMM, chapter 24-00-00, pageblock 201). 

(2) Put up warning signs to tell persons: 

"DO NOT CONNECT THE ELECTRICAL POWER" 

"DO NOT CONNECT THE BATTERIES". 

(3) Open and keep the following panels: 

 Panel number Description Position 

 523AB Access Door Wing LH 

 623AB Access Door Wing RH 

B. Rework of wiring. 

NOTE: Steps (1) thru (4) are applicable for A/C serial numbers 20103 thru 20108 and 

 20110 thru 20123. 

Refer to drawing W7916-057 sheet 006. 

(1) Prepare the jiffy junction fuses: 

(a) Cut 2 pieces of sleeve to the same length as the jiffy junctions. Use: 

- AR sleeve pn F0N1-3613-24-4. 

(b) Use a permanent marker to mark each sleeve with the applicable item number: 

F 6490A or F 6491A. 

(2) Place the sleeves over each jiffy junction fuses. Do not shrink the sleeves. 
Service Bulletin 

Fokker 50/60 

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. 

SBF50-28-024 Jun 23/10 

Page 8 

(3) Rework the wiring at the LH outerwing according to the drawing. Use: 

- 1 wire ref. cableloom W7987-520-401 

- 2 sockets pn M39029-22-192 (FC652) 

- 1 socket pn M39029-30-217 (FC431) 

- 1 fuse, jiffy junction F6491A pn DME-F07 

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

(4) Rework the wiring at the RH outerwing according to the drawings. Use:: 

- 1 wire ref. cableloom W7987-520-401 

- 2 sockets pn M39029-22-192 (FC652) 

- 1 socket pn M39029-30-217 (FC431) 

- 1 fuse, jiffy junction F 6490A pn DME-F07 

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

NOTE: Steps (5) thru (8) are applicable for A/C serial numbers 20109, 20124 thru 20335. 

Refer to drawing W7916-057 sheet 007. 

(5) Prepare the jiffy junction fuses: 

(a) Cut 4 pieces of sleeve to the same length as the jiffy junctions. Use: 

- AR sleeve pn F0N1-3613-24-4. 

(b) Use a permanent marker to mark each sleeve with the applicable item number: 

F 6490A, F 6491A, F 6492A or F6493A. 

(6) Place the sleeves over each jiffy junction fuses. Do not shrink the sleeves. 

(7) Rework the wiring at the LH outerwing according to drawing. Use: 

- 2 wires ref. cableloom W7987-520-402 

- 4 sockets pn M39029-22-192 (FC652) 

- 2 sockets pn M39029-30-217 (FC431) 

- 2 fuses, jiffy junction pn DME-F07 

 (F 6491A & F 6493A) 

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

(8) Rework the wiring at the RH outerwing according to drawing. Use: 

- 2 wires ref. cableloom W7987-520-402 

- 4 sockets pn M39029-22-192 (FC652) 

- 2 sockets pn M39029-30-217 (FC431) 

- 2 fuses, jiffy junction pn DME-F07 

 (F 6490A & F 6492A) 

- AR tape, lacing pn Fk05-090(A). 
Service Bulletin 

Fokker 50/60 

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 SBF50-28-024 

Page 9 

C. Restore electrical power. 

(1) Install all electrical power (Refer to the AMM, chapter 24-00-00, pageblock 201). 

(2) Remove the warning signs to tell persons: 

"DO NOT CONNECT THE ELECTRICAL POWER" 

"DO NOT CONNECT THE BATTERIES". 

D. Do the following operational test of the Dual Level Control Pilot Valves to verify correct 

operation: 

(1) Shut-Off Test refer AMM 28-21-03-400-814, subtask 28-21-03-710-014 steps E (1) 

thru E (21). 

E. Close the panels, you opened in step A.(3). 

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

clean. 


FOKKER SERVICES B.V.

ENGINEERING DEPARTMENT

CABLELOOM CONNECTIONLIST

PARTNUMBER PARTNAME CODIFICATION DWG NR : W7987-520

EL. CABLE

DASH NR : -401

ISSUE : -

SHEET : 1

DATE : 051024

FROM CABLE LENGTH TO WIRING

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

GXA0051 B2 NK 20 250 W7916-057

GWA0045 B2 NK 20 250 W7916-057

QTY

F0N9-1780NK20 A.R. 01316-95004
FOKKER SERVICES B.V.

ENGINEERING DEPARTMENT

CABLELOOM CONNECTIONLIST

PARTNUMBER PARTNAME CODIFICATION DWG NR : W7987-520

EL. CABLE

DASH NR : -402

ISSUE : -

SHEET : 2

DATE : 051024

FROM CABLE LENGTH TO WIRING

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

GXA0051 B2 NK 20 250 W7916-057

GXA0052 B2 NK 20 250 W7916-057

GWA0045 B2 NK 20 250 W7916-057

GWA0046 B2 NK 20 250 W7916-057

F0N9-1780NK20 01316-95004

QTY

A.R.
Manual Change Notification – Maintenance Documentation 

Fokker 50/60 

JUN 23/10 MCNM F50-070

Page 1 of 2 

MCNM-F50-070 

Subject : Fuel – Introduction of Fuses in the Wiring of the Dual Level Control Pilot Valves. 

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 SBF50-28-024. 

Effectivity : Refer to SBF50-28-024. 

 

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 Aircraft Maintenance Manual (AMM) 

 The Wiring Manual (WM) 

 The Trouble Shooting Schematics Manual (TSSM). 

 

Change Note : AMM

 Delete AMM Task 28-21-03-200-816-A. 

 Update the AMM Task 28-21-00-ZZ2-810-A, as follows: 

- Add a new paragraph that contains this text: 

 Fuse Junction 

(1) The fuses prevent that a short-circuit in the electrical-installation of a pilot valve 

can result in an ignition-source in the fuel tank. 

(2) The fuse junctions are installed in the electrical-wiring of the pilot-valves, between 

the wing rear-spar and the main tank in zone 523 and 623. 

- Add the new fuse junctions to the Component Location Index. 

For a/c serial numbers 20103 thru 20108 and 20110 thru 20123, do as follows: 

 Update the AMM Task 28-21-03-400-814-A, as follows: 

- Add the text (CDCCL) in front of the title of the Task 

- Add the following Note below the title of the Task: 

- Add this new Subtask before Subtask 28-21-03-001-114-A00: 
Manual Change Notification – Maintenance Documentation 

Fokker 50/60 

JUN 23/10 MCNM F50-070

Page 2 of 2 

For a/c serial numbers 20109 and 20124 thru 20335, do as follows: 

 Update the AMM Task 28-21-03-400-814-A, as follows: 

- Add the text (CDCCL) in front of the title of the Task 

- Add the following Note below the title of the Task: 

- Add this new Subtask before Subtask 28-21-03-001-114-A01: 

 WM/TSSM

Update Chapter 28-21, in accordance with the drawings as given in SBF50-28-

024, paragraph 2.D.). 

NOTE: If you have a Documentation Revision Service (DRS) with Fokker Services, this information 

will be included into your manuals at the earliest opportunity.