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-Off Valve Solenoid wiring. 

1. Planning Information 

A. Effectivity 

(1) F28 aircraft serial numbers: 

11003 thru 11241 

11991 and 11992 

(2) Production version of this 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 of the 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 of the Solenoid of the Level Control Pilot Valve, the 

Main Tank Overflow Valve Reed Switch, the Collector Tank Level Float Switch or the 

Main Tank Fueling Shut-Off Valve 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 of the 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 of the Solenoid of the Fueling Shut-Off Valve, 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 jiffy junction 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 of this Service Bulletin within 24 

months after the issue date of this 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 

except with 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 of the required compliance, please be aware of the Appendix lead 

time of 3 months. 

F. Approval 

(1) The technical content of this 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 of this 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 of this Proforma Service Bulletin. 

(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 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 of an 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 of the 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 of the 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 TANK RH 

ST A. 81 0 0 - 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 of the Modification 

(Example is the installation of the 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.