Proforma 

## Service Bulletin Fokker F28

"This Service Bulletin is associated with the Fuel Tank Safety Program" General The Introduction of Fuses in Level Control Pilot Valve Solenoid-, Main Tank Overflow Valve-, Collector Tank Level Float Switch- and Main Tank Fueling Shut-OffValve Solenoid wiring. 1 . Planning Information 

### A. Effectivity (1) F28 aircraft serial numbers: 11003 thru 11241 11991 and 11992 (2) Production version ofthis modification : Not applicable. B. Concurrent Requirements (1) Before, or at the same time, you do this SB, you must do:

- SBF28-28-049- FUEL- General -The introduction of a Fuse in the Collector Tank Level Float Switch Wiring .
- SBF28-28-051 - FUEL- General -The Introduction of a Fuse in the Level Control Pilot Valve Wiring . C. Reason 

# I Page (1) The design review ofthe F28 Mk 1000 thru 4000 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 tanks.

Jan 09/14 SBF28-28-056 Proforma

Page 1 Copyright All rights reserved by Fokker Servtees 8 V. (The Netherlands). This document has been supplied by Fokker Services B.V. to b 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.

## Service Bulletin Fokker F28 (2) Under certain failure conditions ofthe Solenoid ofthe Level Control Pilot Valve, the Main Tank Overflow Valve Reed Switch , the Collector Tank Level Float Switch or the Main Tank Fueling Shut-OffValve Solenoid, a short circuit may develop. Such a short circuit may result in an ignition source in the wing tank vapor space. (3) Fuses, packed in a jiffy junction will limit the current and thus prevent this ignition source in the wing tank vapor space. D. Description (1) The Appendix of this Service Bulletin is divided into four (4) parts, and will tell you how to: Part 1 :

- Install the wiring with jiffy junctions (with 

### 1 A fuse included) in the return wire of the Level Control Pilot Valve Solenoid , close to the tank entry point.

- Perform system functional tests. Part 2:

- Install the wiring with jiffy junctions (with 0.25 A fuse included) in the signal and return wires ofthe Main Tank Overflow Valve Reed Switch , close to the tank entry point.

- Perform system functional tests. Part 3:

- Install the wiring with jiffy junctions (with 0.25 A fuse included) in the signal wire of

the Collector Tank Level Float Switch (from Switch to Flight Deck Indicator), close the tank entry point.

- Perform system functional tests. Part 4:

- Install the wiring with jiffy junctions (with 

### 1 A fuse included) in the power supply

and return wires ofthe Solenoid ofthe Fueling Shut-OffValve, close to the tank entry point.

- Perform system functional tests. In figure 

### 1 a typical example is presented of the installation of a wire with jiffy junction. The example shows the installation of a wire with jiffyjunction in the Main Tank Overflow Valve System for the RH wing , close to the Tank Entry Point. E. Compliance (1) Recommended . Fokker Services recommends the accomplishment ofthis Service Bulletin with in 24 months after the issue date ofthis Service Bulletin . SBF28-28-056 Proforma Page 2 Jan 09/14
Copyright All rights reserved by Fokker Servtees B.V. (The Netherlands). This document has been supplied by Fokker Services S.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

**conta~ned** therein for purposes other than explicitly allowed by the aforesaid agreement, is not permitted exceptwith the prior written permissiOn of Fokker Services 8 V.

## Service Bulletin Fokker F28 NOTE : 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. NOTE : In view ofthe required compliance, please be aware ofthe Appendix lead time of 3 months. F. Approval (1) The technical content ofthis document is approved under the authority of DOA ref. EASA.21J .059. G. Manpower (1) Approximately 20 man-hours (5 man-hours for each part) are necessary to do this modification on one aircraft. The elapsed time will be 10 hours for 2 men . Both mentioned figures are estimates. More detailed manpower information will be included in an Appendix to this Proforma Service Bulletin . H. Weight and Balance (1) Weight change: None Index change: None. 

### I. Electrical Load Data (1) Notchanged . J. Software Accomplishment Summary (1) Not applicable. K. References (1) F28 Maintenance Manual (MM) F28 Wiring Diagram Manual (WDM) Fokker internal reference(s) :

- ECR 15105 

### L. Publications Affected (1) This SB affects the publications listed below: (a) Maintenance Documentation

- F28 Maintenance Manual (MM)

- F28 Wiring Manual (WDM) Jan 09/14 SBF28-28-056 Proforma

Page 3 Copyright All rights reserved by Fokker Services B.V. (The Netherlands). Th•s 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.

## Service Bulletin Fokker F28 NOTE: The Manual Change Notification - Maintenance Documentation will be attached to each Appendix to this Proforma Service Bulletin . (b) Maintenance Programs

- F28 Customized Maintenance Program (CMP) NOTE : The affected maintenance program change is described in the paragraph Special Instructions for Continued Airworthiness (ICA) (c) Special Instructions for Continued Airworthiness (ICA) The effect ofthis Service Bulletin on the special ICA is as follows: YES

- Electrical Wiring Interconnection System (EWIS)

- Fuel Tank Safety (FTS) X 

### NOTE: If "YES", the changed ICA will be described in an attachment to each Appendix ofthis Proforma Service Bulletin . (d) Operational Documentation Not affected . (2) For incorporation ofthis 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 lntermixability of Parts (1) Not applicable. NO X



### SBF28-28-056 Proforma Page4 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 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.

### 2. Material Information A. 

### Material- Price and Availability 

## Service Bulletin Fokker F28
(1) On request we will supply you a customized modification proposal including prices and lead-times. The estimated lead time ofan Appendix to this Proforma Service Bulletin and mod kit(s) is 

### 3 months after we receive your order. (2) A customized modification proposal will include an EASA approved Appendix (free of charge), mod kit(s) and revisions ofthe affected documentation (if applicable) . (3) 

### You can contact your Fokker Services Customer Support Manager for such a modification proposal. B. Material Required (1) 

### Will be part ofthe Appendix. The mod kit will comprise wires, jiffy junctions with fuse included and identification sleeves. Lacing tape and splices will be specified as local source items. C. Tooling - Price and Availability (1) 

### Not applicable. D. Drawings Required (1) 

### Will be part of the Appendix. 3. 

### Accomplishment Instructions A. 

### Because this is a Proforma Service Bulletin, we do not include the "Accomplishment Instructions". They will be included in each Appendix to this Proforma Service Bulletin .

Jan 09/14 SBF28-28-056 Proforma

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 provis1ons 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.OUTSI DE FUEL TANK RH - --- 

## Service Bulletin Fokker F28

WING FUEL TAN K RH ST A. 81 00 - Il l 90
OVERFLOW VALVE

**C17 22-NA2~-,A,A,A~~** 

**-. --I----+------I**  2

1 2

**2QC17022-NA~ 211:17E22-11(2**  Figure 1 : Typical example ofthe Modification (Example is the installation ofthe wiring with jiffy junction (with 0.25 

### A fuse included) in the Main Tank Overflow Valve System for the RH wing , close to the tank entry point)

SBF28-28-056 Proforma Page 6 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

**~s** 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.