### Proforma 

## Service Bulletin Fokker F28 This Service Bulletin supersedes the instructions in SBF28-28-047 with regard to the installation of bonding on the main tank level control pilot valve conduit.



### "This Service Bulletin is associated with the Fuel Tank Safety Program" Fuel System - Introduction of improved Bonding Provisions inside the Fuel Tanks 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) At the same time as you do this SB, it is convenient to do : SBF28-57-098 : Rework of the Holes in the Outer Wing Upper Skin Panel Reinforcement Structure for the Outer Wing Fuel Quantity Tank Units. 

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Page Jan 09/14 SBF28-28-058 Proforma

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## Service Bulletin Fokker F28 C. Reason (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 because no controlled bonding provisions are present on a number of critical locations, inside the Fuel Tank or connected to the Fuel Tank Wall. (2) This Service Bulletin gives instructions for the introduction of additional electrical bonding provisions that require opening of the fuel tank access panels. D. Description (1) An Appendix to this Proforma Service Bulletin will tell you how to install extra or improved bonding inside the fuel tanks to the :

- Transfer Jet Pumps. For an impression of the items to be bonded see Figure 1 . Ventilation Float Valves. For an impression ofthe items to be bonded see Figure 2 and 3. CWT Overflow Valves. For an impression of the items to be bonded see Figure 4. Level Control Pilot Valves Wiring Conduit (if pre SBF28-28-047) . For an impression of the items to be bonded see Figure 5. Fuel Quantity Tank Unit (FQTU) no . 7 mounting flange (if pre SBF28-57-098). In figure 6 the position of FQTU number 7 is indicated, with an impression ofthe items to be bonded . NOTE : For aircraft POST SBF28-57-098 , the FQTU no. 7 mounting flange bonding is included in SBF28-28-059

- FQTU no . 7 attachment screws (if pre SBF28-57-098) . In figure 6 the position of FQTU number 7 is indicated , with an impression of the items to be bonded . NOTE: For aircraft POST SBF28-57-098, the FQTU no. 7 attachment screws bonding is included in SBF28-28-059 E. Compliance (1) Recommended . Fokker Services recommends the accomplishment of th is Service Bulletin with in 7 years (84 months) after the issue date of this Service Bulletin . NOTE : Do th is Part at a scheduled tank opening before the above compliance date. NOTE: It is expected that EASA will issue an Airworthiness Directive (AD) with respect to th is subject with the same compliance terms. Refer to the EASA SBF28-28-058 Proforma Page 2 Jan 09/14
Copyright All rights reserved by Fokker Services 8 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

## Service Bulletin Fokker F28 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 are necessary to do this modification on one aircraft. The elapsed time will be 10 hours for 2 men . Both mentioned figures are rough estimates. More detailed manpower information will be included in an Appendix to this Proforma Service Bulletin . H . Weight and Balance (1) Weight change : + 0 , 1 kg (0 .22 Ib) Index change : None 

### I. Electrical Load Data (1) Not changed . J . Software Accomplishment Summary (1) Not applicable . 

### K. References (1) F28 Service Bulletin (SB) :

- SBF28-28-047

- SBF28-28-059

- SBF28-57-098 Fokker internal reference :

- ECR15105 . L. Publications Affected ( 1) This SB affects the publications listed below: (a) Maintenance Documentation

- F28 Maintenance Manual (MM) Jan 09/14 SBF28-28-058 Proforma

Page 3 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 sub}ect 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 speciaiiCA is as follows : YES

- Electrical Wiring Interconnection System (EWIS)

- Fuel Tank Safety (FTS) X 

### NO 

### 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.

SBF28-28-058 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 'Nith the prior written permission of Fokker Services B.V.

### 2. Materiallnformation 

### 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 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 and will comprise bonding leads, clamps and attaching materials. C . Tooling - Price and Availability 

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

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

### Accomplishment Instructions 

### A. Accomplishment Instructions will be included in each Appendix to this Proforma Service Bulletin .

Jan 09/14 SBF28-28-058 Proforma

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### Figure1

SBF28-28-058 Proforma Page 6 Bonding improvement of transfer jet pump. (in LH and RH wing) 

## Service Bulletin Fokker F28

PUMP 

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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 'Nit.h the prior written permission of Fokker Services B.V.

### Figure 2:

Figure 3: 

### Jan 09/14 COL L E

CT OR TANK



### Location of Ventilation Float Valves (RH wing is mirror image)

Location of bonding improvement of ventilation float valve . 

## Service Bulletin Fokker F28

SBF28-28-058 Proforma

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 therein for purposes other than explicitly allowed by the aforesaid agreement, is not permitted except with the prior written perm ission of Fokker Services B.V.' '\ 

### \

BONDING IMPROVEMENT FROM CWT OVERFLOW VALVE TO STRUCTURE

VIEW A 

### Figure 4 : Bonding improvement of CWT Overflow Valve 

## Service Bulletin Fokker F28

SBF28-28-058 Jan 09/14 Proforma Page 8 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.

### Figu re 5:
Jan 09/14 BONDING IMPROVEMENT FROM CONDUIT TO STRUCTURE


### VIEW A Bonding of Level Control Pilot Valve Condu it 

### (RH wing is mirror image) 

## Service Bulletin Fokker F28

LEVEL CONTROL PILOT VALVE



### SBF28-28-058 Proforma

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# ..

PROBE NUMBER 7

BONDING IMPROVEMENT BETWEEN ATIACHMENT SCREWS AND PROBE MOUNTING FLANGE

BONDING IMPROVEMENT BETWEEN PROBE MOUNTING FLANGE AND STRUCTURE 

## Service Bulletin Fokker F28

Figure 

### 6 : Bonding improvement of Fuel Quantity Indication System- probe no . 7.

SBF28-28-058 Proforma Page 10 Jan 09/14 Copyright All rights reserved by Fokker Services B.V. (The Netherlands) Tnis 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.