## Service Bulletin Fokker F28

Jun 22/10 SBF28-28-053 Revision 3, Jan 09/14 Page 1

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. 1. Planning Information A. Effectivity (1) F28 aircraft serial numbers: 11003 thru 11041 11991 thru 11994. 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) Based on this review of the fuel tank system, it was recognized that, for the shielded Fuel Quantity Indication (FQI) system cables in the main and collector fuel tanks of aircraft serial numbers 11003 thru 11041 and 11991 thru 11994, a by-pass wire must be installed between the housings of the FQI cable plugs and the cable shield. This is to prevent that interrupted shield contacts can form spark gaps that could result in an ignition source inside the tank.

Page 1 2 3 4 5 6 7 8 9 10 11 12 Revision 3 3 3 3 3 3 3 3 3 3 3 3 This Service Bulletin partly supersedes Service Bulletin SBF28-28-007.

FUEL “This Service Bulletin is associated with the Fuel Tank Safety Program” Fuel Quantity Indication System - Improvement of FQIS Circuit Cable Shielding in the Fuel Tanks

## Service Bulletin Fokker F28

SBF28-28-053 Jun 22/10 Page 2 Revision 3, Jan 09/14

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. (3) For F28 aircraft serial numbers 11003 thru 11041 and 11991 thru 11994 a CDCCLitem is introduced to assure that for the shielded FQI cables in the fuel tanks a bypass wire remains installed. (4) For aircraft serial numbers 11042 thru 11241 improved connectors were introduced. These connectors have an improved connection between the cable shield and the housing of the connector. For these aircraft the installation of a by-pass wire is not applicable. (5) SBF28-28-011 is revised together with this Service Bulletin to ensure that a by-pass wire is (re)installed when crimp type coax ial plugs are replaced with solder type coaxial plugs in accordance with SBF28-28-011. (6) SBF28-28-007 is partly superseded by this Service Bulletin. The modification as introduced per SBF28-28-007 remains applicable for the plugs outside the fuel tanks. For the in-tank plugs, this Service Bulletin supersedes SBF28-28-007.

Reason for Revision (1) This revision is made to:

- Remove text and references related to SBF28-28-055 in the top right corner on page 1 and in the reason paragraph due to the cancellation of SBF28- 28-055. - Add the removal and installation of the wires including the conduit to install the by-pass wire on the coaxial plug(s) outside the fuel tank. - Replace the Fuel CDCCL in paragraph 1.L.(1)(c) by a reference to SBF28-28-050. - Update the compliance paragraph. D. Description (1) This Service Bulletin tells you how to: - Part 1 Check for the Presence of the by-pass wire between the housings of the intank FQI cable plugs and the cable shield.

- Part 2 Introduce the by-pass wires, if not yet installed.

- Part 3 Incorporate a CDCCL Item. E. Compliance (1) Recommended

- Part 1 Fokker Services recommends the accomplishment of Part 1 of this Service Bulletin not later than 1 May 2017.

- Part 2 If applicable, Fokker Services recommends the accomplishment of part 2 of this Service Bulletin before further flight after accomplishment of part 1.

- Part 3 During accomplishment of part 1 of this Service Bulletin.

## Service Bulletin Fokker F28

Jun 22/10 SBF28-28-053 Revision 3, Jan 09/14 Page 3

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. NOTE : Because of the required tank opening it is efficient to do this Service Bulletin concurrently with a scheduled tank inspection before the above compliance date.

NOTE : EASA Airworthiness Directive 2011-0184 has been issued with respect to this subject.

NOTE: It is expected that EASA will issue a (new or revised) Airworthiness Directive (AD) 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 under the authority of DOA nr. EASA.21J.059. G. Manpower (1) Approximately 6 man-hour is necessary to do Part 1 of this Service Bulletin on 1 aircraft. Elapsed time estimated 3 hours. This table of manpower will help you to schedule and do part 1 of this Service Bulletin:

Instructions Men Man-hours Elapsed time (hours) Removal - - - Inspection 2 6,0 3,0 Installation Testing Total 6,0 3,0 (2) Approximately 7 man-hours are necessary to do Part 2 of this Service Bulletin on 1 aircraft. Elapsed time estimated 4 hours. This table of manpower will help you to schedule and do part 2 of this Service Bulletin:

Instructions Men Man-hours Elapsed time (hours) Removal - - - Modification 2 3,0 1,5 Installation 2 3,0 1,5 Testing 1 1,0 1,0 Total 7,0 4,0

## Service Bulletin Fokker F28

SBF28-28-053 Jun 22/10 Page 4 Revision 3, Jan 09/14

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. (3) 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”).

NOTE : This estimate does not include: - The time necessary for the paint to dry and the sealant to cure. - To ventilate the fuel tank necessary for safe maintenance in the fuel tank. 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 Wiring Diagram Manual (WDM) Fokker 28 Service Bulletin (SB): - SBF28-28-007 - SBF28-28-011 - SBF28-28-050 - SBF28-28-055 Fokker internal reference(s): - ECR 15686.

## Service Bulletin Fokker F28

Jun 22/10 SBF28-28-053 Revision 3, Jan 09/14 Page 5

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. L. Publications Affected (1) This SB affects the publications listed below: (a) Maintenance Documentation - Fokker 28 Wiring Diagram Manual (WDM) - chapter 20-20

NOTE : See attached Manual Change Notification MCNM F28-036 (b) Maintenance Programs

- Not affected. (c) Special Instructions for Continued Airworthiness (ICA) This Service Bulletin requires a revision to the Instructions for Continued Airworthiness (ICA) for:

YES NO - Electrical Wiring Interconnection System (EWIS) - X - Fuel Tank Safety (FTS) X - The Fuel CDCCL item 1.7, as specified in Revision 2 (or subsequent) of SBF28-28-050, is applicable after accomplis hment of this Service Bulletin. The content(s) of the affected manual(s) shall be revised in accordance with MCNM-F28-036. (d) Operational Documentation

- Not affected. (2) Report to Fokker Services that this SB has been carried out on the applicable aircraft. (3) For incorporation of this Service Bulletin in your documentation refer to the Service Bulletin Introduction, section 4 "Incorporation of Service Bulletins in Documentation of Fokker Services". (4) Accomplishment of this SB is only complete with incorporation of the manual change(s), per the ref. MCNM/MCNO, Temporary Revision or General M. Interchangeability or Intermixability of Parts (1) Not applicable.

## Service Bulletin Fokker F28

SBF28-28-053 Jun 22/10 Page 6 Revision 3, Jan 09/14

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. 2. Material Information A. Material – Price and Availability (1) You can order the necessary parts against list price. 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 F0N9-1224-2 6 Wire-end Cap - - Local source F0N9-1230-8 6 Solder Sleeve - - Local source F0N9-1927Z220 1 m Wire - - Local source F0N1-3613-12 1 m Sleeve - - Local source F0N1-9001-20 AR* Solder - - Local source PR1422 AR* Sealant or equivalent - Local source

NOTES : * Use as much as necessary (2) These 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.

## Service Bulletin Fokker F28

Jun 22/10 SBF28-28-053 Revision 3, Jan 09/14 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 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. 3. Accomplishment Instructions

General: - Refer to the WDM for the Component Location. - For finish codes reference, refer to “Myfokkerfleet.com/Documentation/FC”. - For CML material number references, refe r to “Myfokkerfleet.com/Documentation/CML. - For easy reference, the aircraft serial numbers are divided in the following blocks:

Part 1 : Check for the presence of the by-pass wire A. The job Set-up. (1) Remove all electrical power (Refer to the MM, chapter 24-00-00). (2) Put up warning signs to tell persons: - “DO NOT CONNECT THE ELECTRICAL POWER” - ”DO NOT CONNECT THE BATTERIES”. (3) Drain L.H. and R.H. main- and collector tanks completely. B. On main circuit breaker panel no. 3 trip circuit breakers: - Quant. Ind. L.H. tank, position K-22 - Quant. Ind. R.H. tank, position L-22 - Boosterpumps L.H. tank position A-22, C-22 - Boosterpumps R.H. tank position D-22, F-22. C. Open L.H. and R.H. collector tanks and L.H. and R.H. main tanks by removing access panels nrs. 71A, 72A, 73A and 74A. D. Gain access to the following plugs: EK 15-710 (collector tank L.H. 2EK 15-720 (collector tank R.H. EK 24-710 (collector tank L.H. 2EK 24-720 (collector tank R.H. EK 26-731 (tank comp’t 2 L.H. 2EK 26-741 (tank comp’t 2 R.H. E. Check for the presence of the by-pass wire, (ref. Fig. 1) F. If a by-pass wire is correctly installed on all 6 plugs, perform step E (except step E2) and step F of Part 2 of this Service Bulletin. G. If a by-pass wires is not installed or not installed correctly on one or more plugs, continue with Part 2 of this Service Bulletin. Tank empty

Tank empty

Tank empty

## Service Bulletin Fokker F28

SBF28-28-053 Jun 22/10 Page 8 Revision 3, Jan 09/14

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. Part 2 : Install a by-pass wire A. Removal of Conduit including Wire(s). Steps (1) thru (4) are applicable for coaxial plugs EK25-710, EK26-731, 2EK25-720 and 2EK26-741. (1) Disconnect the coaxial plug. (2) Disconnect the other end of the wire from the tank unit. (3) Cut the shield wire. (4) Remove the disconnected wire including conduit for rework according step B. Steps (5) thru (8) are applicable for coaxial plugs EK15-710 and 2EK15-710. (5) Disconnect the coaxial plug and both other plugs from the tank wall feed through. (6) Disconnect the other end of the wires from the tank unit.

NOTE : Identify the wires before disconnecting. (7) Cut the shield wire. (8) Remove the disconnected wires including conduit for rework according step B. B. Install a short length of by-pass wire F0N9-1927Z220 to the Fuel Quantity Indication (FQI) system cable: (1) Remove the coaxial plug from the cable. (2) Remove a small part from the jacket of shielded FQI system cable, close to the coaxial plug, using a sharp knife (see fig. 2) (3) Put the conductor of the stripped by-pass wire on the stripped FQI system cable and push the solder sleeve over both the shielded cable and by-pass wire.

NOTES : - The largest diameter of the solder sleeve shall fit the insulation of both cables. - The solder ring of the solder sleeve shall be in the middle of the stripped FQIS cable. - The thermoplastic rings shall be on the un-stripped part of the FQI system cable. (4) Put the heat gun or the infrared heating tool with the reflector round the solder sleeve. (5) After heating, the thermoplastic rings have melted and flowed along the insulation and the solder ring has melted and flowed along the screen.

## Service Bulletin Fokker F28

Jun 22/10 SBF28-28-053 Revision 3, Jan 09/14 Page 9

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. (6) Check the finished solder sleeve:

NOTES : - Solder must be flowed between conductor wires and shield wires. - Inserts flowed. - No discolouring of the sleeve. - Contour of solder perform is no longer visible. - Be careful to prevent overheating of the cable. (7) Slide shrink sleeve pn F0N1-3613-12 ov er the solder sleeve pn F0N9-1230-8. (8) Connect the coaxial plug to the cable as shown in figure 3. (9) Solder the other end of the wire to the plug body as shown in figure 1.

NOTE : Ensure that movable locking part of the plug can be moved freely after soldering. (10) Rework the solder sleeve with shrink sleeve F0N1-3613-12, to insulate and to prevent fuel ingress (see fig. 1). C. Installation of Conduit including Wire(s). Steps (1) thru (3) are applicable for coaxial plugs EK25-710, EK26-731, 2EK25-720 and 2EK26-741. (1) Install the conduit including the wire. (2) Connect the wire to the tank unit. (3) Connect the shield wire to the other shield wire with end-cap pn F0N9-1224-2 (FC 430). Steps (5) thru (9) are applicable for coaxial plugs EK15-710 and 2EK15-710. (4) Install the conduit including the wires. (5) Connect the wires to the tank unit. (6) Connect the shield wire to the other shield wire with end-cap pn F0N9-1224-2 (FC 430). (7) Connect both not reworked plugs to the tank wall feed through. D. Before reconnecting the coaxial plug(s), check the resistance between the center contact and the shielding using test set TF-20. Refer to F.28 Wiring Diagram Manual, Chapter 20-20-0. The resistance should be at least 10 meg. Ohms. E. Reconnect the coaxial plug(s). F. Restore the tank sealing with sealant PR1422. Refer to SRM chapter 51-20-0.

## Service Bulletin Fokker F28

SBF28-28-053 Jun 22/10 Page 10 Revision 3, Jan 09/14

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. The Job Closure and tests. (1) Reset circuit breakers mentioned in Part 1 step B. (2) Check fuel quantity indicating system according to F.28 Maintenance Manual, Chapter 28-41-0, Calibration (preferred method. (3) Close collector tank and main tank access panels. (4) Pressure refuel the wing tanks partly to check correct operation of refuel and defuel control system, fuel quantity indication and possible leakage of fuel tank access panels. G. State in the Aircraft Logbook that the aircraft is post SBF28-28-053.

Part 3 : Incorporate the CDCCL item in the approved aircraft maintenance program documents. For the contents of the CDCCL item refer to paragraph 1.L.(1).(c) of this Service Bulletin.

## Service Bulletin Fokker F28

Jun 22/10 SBF28-28-053 Revision 3, Jan 09/14 Page 11

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. The Installation of the by-pass wire Figure 1

1. Larger diameter 2. Solder ring 3. Smallest diameter 4. Thermoplastic rings

The Installation of the solder sleeve Figure 2 By-pass wire F0N9-1927Z220 Plug 1211-422 or 1211C-422 or 1211-423 or 1211C-423

Solder wire at this location Shrink sleeve F0N1-3613-12 Solder sleeve F0N9-1230-8

Shielded FQIS cable

## Service Bulletin Fokker F28

SBF28-28-053 Jun 22/10 Page 12 Revision 3, Jan 09/14

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. Assembly of plug Figure 3

## Manual Change Notification – Maintenance Documentation Fokker 28

JUN 22/10 MCNM F28-036 Page 1 of 1 MCNM-F28-036 Subject : Fuel – Improvement of Fuel Quantity Indication System Circuit Cable Shielding in the Fuel Tanks. 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 SBF28-28-053. Effectivity : Refer to SBF28-28-053. 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 Wiring Diagram Manual (WDM). Change Note : WDM

For aircraft serial numbers, 11003 thru 11041 and 11991 thru 11994, do as follows:

− Incorporate a new maintenance practices procedure into Chapter 20-20-0, to include the installation of the by-pass wire installation as given in SBF28- 28-053, Part 2.

− Make sure that a shielding indication from the cable to the plug is shown in the wiring diagram, at the following equipment numbers:

Coaxial Plugs in the Collector Tank/Wing Fuel Tank Equipment number ATA Reference EK15-710 28-41-00 EK24-710 28-41-00 EK26-731 28-41-00 2EK15-720 28-42-00 2EK24-720 28-42-00 2EK26-741 28-42-00

NOTE: If you have a Continued Airworthiness Document ation Service with Fokker Services, this MCN will be included into your manuals, at the earliest opportunity.