## Service Bulletin Fokker F27

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.

Jun 23/10 SBF27-28-069 Page 1 1. Planning Information

A. Effectivity

(1) F27 Mark 200, 300, 400, 500, 600, 700 aircraft

All aircraft serial numbers.

NOTE : Fuel Tank Safety program is not applicable to F27 Mark 100.

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

B. Concurrent Requirements

(1) Not applicable.

C. Reason

(1) The design review of the F27 Mk 200/300/400/500/600/700 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 Fuel 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.

Page 1 2 3 4 5 6 7 8

Revision - - - - - - - -

Attachments 2 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 a Fuse in the Dual Fuel Pilot Valve Wiring

## Service Bulletin Fokker F27

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.

SBF27-28-069 Jun 23/10 Page 2 (3) The fuse, packed in a jiffy junction will limit the current and thus prevent this ignition source in the wing tank vapour space.

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 SBF27-00-001 (Service Bulletin Introduction, section 2.C., "Manpower").

## Service Bulletin Fokker F27

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.

Jun 23/10 SBF27-28-069 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

(a) Fokker 27 Maintenance Manual (MM) Fokker 27 Wiring Diagram Manual (WDM) 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 27 Wiring Diagram Manual (WDM) - chapter 28-21 - Fokker 27 Maintenance Manual - chapter 28-22 (pre ATA) - section H.

NOTE : See attached Manual Change Notification MCNM F27-025.

(b) Maintenance Programs

Not affected.

(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.

## Service Bulletin Fokker F27

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.

SBF27-28-069 Jun 23/10 Page 4 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 instructions in the AMM, changed in accordance with the instructions in the attached MCNM F27-025.

(d) Operational Documentation

Not affected.

(2) For incorporation of this Service Bulletin in your documentation refer to SBF27-00- 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 F27

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.

Jun 23/10 SBF27-28-069 Page 5 2. Material Information

A. Material – Price and Availability

(1) You can order the necessary parts as mod kits SB2728069-XU-A and SB2728069-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 F0N1-9001-20 * Solder FC100 - Local source

NOTES : * 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 A B Keyword Info Old Part Number Instructions/ Disposition

DME-F07 4 4 Fuse, Jiffy Junction 1 Amp - - F0N1-3613-24-4 1m* 1m* Sleeve - - - M39029-22-192 8 8 Socket FC652 - - M39029-30-217 - 2 Socket FC431 - -

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

(3) Applicability of mod kits: Qty A (SB2728069-XU-A) is applicable to do this Service Bulletin on one aircraft serial number 10105 thru 10570. Qty B (SB2728069-XU-B) is applicable to do this Service Bulletin on one aircraft serial number 10571 thru 10684, 10686 thru 10687 and 10689 thru 10692.

C. Tooling – Price and Availability

(1) Not applicable.

## Service Bulletin Fokker F27

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.

SBF27-28-069 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 W7202-138 001 B A4 RF Wiring Diagram Tank Fueling/Defueling 10105 thru 10570

W7202-138 002 B A4 RF Wiring Diagram Tank Fueling/Defueling 10571 thru 10684 10686 thru 10687 10689 thru 10692

## Service Bulletin Fokker F27

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.

Jun 23/10 SBF27-28-069 Page 7 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 24-00-00, pageblock 201).

(2) Put up warning signs to tell persons: "DO NOT CONNECT THE ELECTRICAL POWER" "DO NOT CONNECT THE BATTERIES".

B. Get access to the Dual Fuel Pilot Valve Connections. For applicable panels refer to MM 06-30-00 LH area 611, panel no. 90 and 90A and RH area 621, panel 151 and 151A.

C. Rework of the wiring

. For aircraft serial numbers 10105 thru 10570, refer to drawing W7202-138 sheet 001. For aircraft serial numbers 10571 and up, refer to drawing W7202-138 sheet 002.

(1) Rework the wiring of the LH outerwing and identify the two jiffy junctions according to drawing. Use: - 2 fuses, jiffy junction pn DME-F07

MH 92301, MH92302 - 4 sockets pn M39029-22-192 (FC652) - AR solder pn F0N1-9001-20 (FC100) - AR sleeve* pn F0N1-3613-24-4. - AR tape, lacing pn Fk05-090(A). For aircraft serial numbers 10571 and up only: - 1 socket pn M39029-30-217 (FC431).

NOTE : * Use a permanent marker to mark the two sleeves with the Applicable item number: MH 92301 or MH 92302. Do not shrink the sleeves.

## Service Bulletin Fokker F27

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.

SBF27-28-069 Jun 23/10 Page 8 (2) Rework the wiring of the RH outerwing and identify the two jiffy junctions according to drawing. Use: - 2 fuses, jiffy junction pn DME-F07 MH 92401, MH92402 - 4 sockets pn M39029-22-192 (FC652) - AR solder pn F0N1`-9001-20 (FC100) - AR sleeve* pn F0N1-3613-24-4. - AR tape, lacing pn Fk05-090(A). For aircraft serial numbers 10571 and up only: - 1 socket pn M39029-30-217 (FC431).

NOTE : * Use a permanent marker to mark the two sleeves with the Applicable item number: MH 92401 or MH 92402. Do not shrink the sleeves.

D. Restore electrical power.

(1) Install all electrical power (Refer to the MM, 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".

E. Do the following adjustment/test to verify correct operation:

(1) Pressure Refueling test, refer to MM 28-22-00.

F. Close the panels, you opened in step B.

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

## Manual Change Notification – Maintenance Documentation F27

JUN 23/10 MCNM F27-025 Page 1 of 3 

### MCNM-F27-025

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 SBF27-28-069.

Effectivity : Refer to SBF27-28-069.

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

If your manual contains ATA chapter 28-22-00 pageblock 001 (all codes), then do as follows:

- In 2. Components, add the following paragraph:

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 at STA 10030 and the main tank.

If your manual contains ATA chapter 28-22-01 pageblock 401 (all codes), then do as follows:

- In 1. General, add the following paragraph:

- In 3.C. Installation, add the following step, and re-identify the existing steps accordingly:

NOTE: Start of Fuel System CDCCL affected Section.

(1) Do a check of the fuse junctions, which are installed in the aircraft electrical-wiring of the pilot valve

NOTE: The installation of each fuse junction is identified with a yellow sleeve at each end.

## Manual Change Notification – Maintenance Documentation F27

JUN 23/10 MCNM F27-025 Page 2 of 3 (a) In the electrical-cable that connects to the electrical-connectors for the pilot valve, find the installation of the two fuse junctions (Refer to the Wiring Diagram Manual 28-22-00 for more data). (b) Make sure that the installation of each fuse junction is in good condition and not damaged. (c) Make sure that the partnumber DMEF07 is clearly shown on each fuse junction.

NOTE: End of Fuel System CDCCL affected section.

If your manual contains Temporary Revision No. 28-36 after ATA chapter 28-22- 01 pageblock 401, then remove and discard this document from your manual.

If your manual contains section H. ”Fuel and Water/Methanol System”, then do as follows:

- In chapter H1, add the following paragraph to the System Components description given for the Pressure Refuelling system:

Fuse Junction Fuses are installed to prevent that a short-circuit in the electrical-installation of a pilot valve can result in an ignition-source in the fuel tank. The fuse junctions are installed in the electrical-wiring of the pilot-valves, between the wing rear-spar at STA 10030 and the main tank.

- In chapter H2, add the following paragraph below the title of the Pilot Valve Removal/Installation procedure:

- In chapter H2, add the following step to the installation steps given for the pilot valve, and re-identify the existing steps accordingly:

NOTE: Start of Fuel System CDCCL affected Section.

(1) Do a check of the fuse junctions, which are installed in the aircraft electrical-wiring of the pilot valve

NOTE: The installation of each fuse junction is identified with a yellow sleeve at each end.

(a) In the electrical-cable that connects to the electrical-connectors for the pilot valve, find the installation of the two fuse junctions (Refer to the wiring-diagram given for ”Underwing Pressure Refuelling” in the Wiring Diagram Manual, for more data). (b) Make sure that the installation of each fuse junction is in good condition and not damaged.

## Manual Change Notification – Maintenance Documentation F27

JUN 23/10 MCNM F27-025 Page 3 of 3 (c) Make sure that the partnumber DMEF07 is clearly shown on each fuse junction.

NOTE: End of Fuel System CDCCL affected section.

- If your manual contains Temporary Revision No. H-15 in chapter H3, then remove and discard this document from your manual.

WDM

Update the wiring diagram given for ”Underwing Pressure Refuelling”, in accordance with the drawings as given in SBF27-28-069, paragraph 2.D.).

NOTE: If you have a Continued Airworthiness Docu mentation Service (CADS) with Fokker Services this information will be included in to your manuals at the earliest opportunity.