Service Bulletin 

Fokker F28 

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. 

Apr 20/10 SBF28-28-052 

Page 1 

1. Planning Information

A. Effectivity 

(1) F28 aircraft serial numbers: 

11003 thru11241 if equipped with Center Wing Tank (CWT). 

B. Concurrent Requirements 

(1) Not applicable. 

C. Reason 

(1) Shortly after the start of the operation of the F28 aircraft, it was demonstrated that the 

shape of the cam on the inside of the fueling panel access door did not ensure that 

the power switch was switched off after closing the door. A new cam pn A42509-089 

was introduced with Service Bulletin SBF28-28-001 (for aircraft already in operation) 

or on the production line (before aircraft delivery to operator). 

Page 1 2 3 4 5 6 7 8 9 

Revision - - - - - - - - - 

For aircraft equipped with 

Center Wing Tank, this 

Service Bulletin supersedes 

Service Bulletin SBF28-28-

001 

 FUEL

 “This Service Bulletin is associated with the Fuel Tank Safety Program” 

Fueling Control Panel - Check for the Presence of, and if Necessary the installation of, a 

Modified Cam for Automatic Off-Switching of Power Switch on the 

Fueling Panel 
Service Bulletin 

Fokker F28 

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. 

SBF28-28-052 Apr 20/10 

Page 2 

(2) More recently, the design review of the F28Mk1000/2000/3000/4000(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 when electrical 

power for refueling is not switched off after refueling. Under certain conditions this 

may result in an ignition source in the wing tank vapour space. 

(3) To remove this potentially unsafe condition, it must be ensured that the new cam pn 

A42509-089 is still installed on all aircraft and functions correctly. 

(4) This Service Bulletin is only applicable for aircraft equipped with a Center Wing Tank. 

D. Description 

(1) This Service bulletin consists out of two parts: 

- Part 1 of this Service Bulletin tells you to check, if the cam pn A42509-089 is (still) 

 installed and operates correctly. 

- Part 2 of this Service Bulletin tells you how to install the cam pn A42509-089 and 

 check that it operates correctly. 

E. Compliance 

(1) Recommended 

Part 1: Fokker Services recommends the accomplishment of part 1 of this Service 

 Bulletin within 6 months after the date of issue of this Service Bulletin. 

Part 2: Fokker Services recommends the accomplishment of part 2 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 (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. 

F. Approval 

(1) The technical content of this document is approved by EASA or under the authority of 

DOA nr. EASA.21J.059. 
Service Bulletin 

Fokker F28 

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. 

Apr 20/10 SBF28-28-052 

Page 3 

G. Manpower 

(1) Approximately 0,5 man-hour is necessary to do Part 1 of this Service Bulletin on 1 

aircraft. 

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 - - - 

Modification 

Inspection 1 0,5 0,5 

Installation - - - 

Testing - - - 

Total 0,5 0,5 

(2) Approximately 2,5 man-hours are necessary to do Part 2 of this Service Bulletin on 

one aircraft. 

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 1 0,5 0,5 

Modification 

Inspection 2 1,0 0,5 

Installation 1 0,5 0,5 

Testing 1 0,5 0,5 

Total 2,5 2,0 

NOTE: This estimate does not include the time necessary for the paint to dry and 

the sealant to cure. 

(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"). 

H. Weight and Balance 

(1) Weight change: None 

Index change: None. 
Service Bulletin 

Fokker F28 

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. 

SBF28-28-052 Apr 20/10 

Page 4 

I. Electrical Load Data 

(1) Not affected. 

J. Software Accomplishment Instructions 

(1) Not applicable. 

K. References 

(1) Fokker internal reference(s): 

Fokker 28 Maintenance Manual (MM) 

Fokker 28 Structural Repair Manual (SRM) 

Fokker internal reference(s): 

 - WI-1539 

 - ECR 15105. 

L. Publications Affected 

(1) This SB affects the publications listed below: 

(a) Maintenance Documentation

- F28 Illustrated Parts Catalog (IPC) - chapter 28-20 

 F28 Maintenance Manual (MM) chapter 28-20 

NOTE: See attached Manual change Notification MCNM F28-033. 

(b) Maintenance Programs

- Fokker 28 Maintenance Program 

(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 ALI and CDCCL items as specified below shall be followed and 

incorporated in the approved aircraft maintenance program documents. 

Fuel ALI: It shall be assured that cam pn A42509-089 at the Fueling Panel (FP) 

 access door, is installed and functions properly. The function is that the 

 power switch of the FP is switched OFF by closing the access door. 

The check interval is 1200 FH and the first repeat check must be 

performed: 

- if only part 1 is applicable: not later than 1200 FH after the check for 
Service Bulletin 

Fokker F28 

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. 

Apr 20/10 SBF28-28-052 

Page 5 

 correct functioning of the cam in part 1 was performed or 

- if part 1 and part 2 are applicable: not later than 1200 FH after the 

 check for correct functioning of the cam in part 2 was performed. 

 

 The check must be performed in accordance with the instructions in 

 the new operational check for the Fuel ALI introduced with the 

 attached MCNM F28-033. 

CDCCL: In case of replacement or removal / installation of Fueling Panel (FP) 

 access door, cam or FP it shall be verified after (re)installation that 

 cam with partnumber A42509-089 is installed and functions properly. 

 The verification shall be performed in accordance with the instructions 

 in the new check for the CDCCL introduced with the attached MCNM 

 F28-033. 

(d) Operational Documentation

Not affected. 

(2) For incorporation of this Service Bulletin in your documentation refer to SBF28-28-

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 

 changes, per the ref MCNM/MCNO, Temporary Revision or general revision. 

M. Interchangeability or Intermixability of Parts 

(1) Not applicable. 
Service Bulletin 

Fokker F28 

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. 

SBF28-28-052 Apr 20/10 

Page 6 

2. Material Information

A. Material – Price and Availability 

(1) You can order the necessary parts against list price. 

B. Material Required 

(1) Part 1: No materials required. 

(2) Part 2: 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

A42509-089 1 Cam - A42509-081 Scrap 

NAS 601-18 1 Screw - NAS601-6 Scrap 

NAS 601-6 1 Screw - - Scrap 

NAS 1291-06 2 Nut - NAS 1291-06 Scrap 

AN 960 PD 6L 2 Washer - AN 960 PD 6L Scrap 

C. Tooling – Price and Availability 

(1) Not applicable. 

D. Drawings Required 

(1) Not applicable. 
Service Bulletin 

Fokker F28 

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. 

Apr 20/10 SBF28-28-052 

Page 7 

3. Accomplishment Instructions

General: 

- For finish codes references, refer to “Myfokkerfleet.com/Documentation/FC”. 

- For CML material number references, refer to “Myfokkerfleet.com/Documentation/CML”. 

- For the removal/installation of solid rivets, refer to the SRM, chapter 51-31-00. 

- For the application of Primer and Paint, refer to the MM, chapter 51-30-00. 

- For drilling and countersinking procedures, refer to the SRM, chapter 51-10-00. 

WARNING: BE CAREFUL WHEN YOU USE THE CONSUMABLE MATERIALS. OBEY 

THE INSTRUCTIONS AND MANUFACTURER'S HEALTH AND SAFETY 

INSTRUCTIONS. 

Part 1: Inspection for the presence and correct functioning of cam pn A42509-089 

A. Open access door no. 95C (of fueling panel).

Refer to Figure 1 (NEW SITUATION) 

B. Check the presence of modified cam pn A42509-089. To identify that cam pn A42509-089 

is installed, check that contour of cam is in accordance with Figure 1 (new situation).If 

cam pn A42509-089 is not present then perform part 2 of this Service Bulletin. If cam pn 

A42509-089 is present proceed with step C. 

C. Check the function of the cam in accordance with step D of part 2. 

D. Close access door no. 95C (of fueling panel).

Part 2: Installation of cam pn A42509-089 

A. Lift the switch guard and open access door no. 95C.(of fueling panel). 

Refer to Figure 1 (OLD SITUATION) 

B. Modify the inside of the door, remove: - 2 Nuts pn NAS1291-06 

 - 2 Washers pn AN960PD6L 

 - 2 Screws pn NAS601-6 

 - 1 Cam pn A42509-081. 

 Refer to Figure 1 (NEW SITUATION) 

C. Install new cam p/n A42509-089 using: 

 - 2 Nuts pn NAS 1291-06 

 - 2 Washers pn AN960PD6L 

 - 1 Screw pn NAS 601-18 

 - 1 Screw pn NAS 601-6. 

D. Check the function of the cam as follows: 
Service Bulletin 

Fokker F28 

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. 

SBF28-28-052 Apr 20/10 

Page 8 

(1) Put the power switch of the fueling panel in “ON”-position. 

(2) Close and latch the fueling panel access door 

(3) Open the fueling panel access door 

(4) Check that the power switch is in the “OFF”- position and the switch guard is closed. 

If necessary, adjust the cam and do the adjustment check again. 

E. Close access door no. 95C (of fueling panel). 
Service Bulletin 

Fokker F28 

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. 

Apr 20/10 SBF28-28-052 

Page 9 

Figure 1 
Manual Change Notification – Maintenance Documentation 

Fokker 28 

APR 15/10 MCNM F28-033 

Page 1 of 5 

MCNM-F28-033 

Subject : Fuel – Improved Automatic Off-Switching of the Power Switch on the Fueling 

Control Panel. 

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 SBF28-28-052. 

Effectivity : Refer to SBF28-28-052. 

 

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 F28 Maintenance Manual (MM) 

 The F28 Illustrated Parts Catalogue (IPC). 

Change Note : AMM

 Update Chapter 28-21-00, page-block 201/501 (as applicable), as follows: 

- In paragraph 1. add the following text after the existing text: 

In addition, a fuel ALI procedure is given, to ensure correct operation of the 

automatic off-switching of the power-switch on the fueling control panel, when 

closing panel (95C). 

- After paragraph 2., add a new paragraph 3.A. that contains the following 

procedure: 

Operational Check of the Automatic Off-Switching of the Power Switch on the 

Fueling Control Panel 

This maintenance procedure affects Fuel Tank Safety. It is related to a fuel 

system ALI (Airworthiness Limitation Item). Strictly adhere to the contents of 

this task to make sure that unsafe conditions do not develop. 

(1) Open panel (95C), to gain access to the fueling control panel. 

(2) Make sure that the installation of power off-switching cam on panel (95C) 

is clean, correctly attached and not damaged. 

NOTE: Start of Fuel System ALI critical section. 

(3) Make sure that the cam partnumber A42509-089 (Post SBF28-28-052) is 

installed (Ref. Fig. 201/501) (See Figure 2 on Page 5 of this MCN). 
Manual Change Notification – Maintenance Documentation 

Fokker 28 

APR 15/10 MCNM F28-033 

Page 2 of 5 

(4) Do the operational check 

NOTE: If necessary, you must adjust the cam on panel (95C). During the 

adjustment, you must make sure that the cam does not touch the 

switch-guard when the POWER switch is in the OFF position and 

panel (95C) is closed. 

(a) On the fueling control panel, lift the switch-guard and set the POWER 

switch to ON. 

(b) Close panel (95C), and open it again. 

(c) Make sure that the POWER switch on the fueling control panel is in 

the OFF position and the switch-guard is closed. 

NOTE: End of Fuel System ALI critical section. 

(5) Close panel (95C). 

 If the aircraft is in the Pre SBF28-28-15 configuration, then update Chapter 28-

21-06, page-block 401, no code, as follows: 

- Add the following text below the text ”1. General”: 

- In paragraph 2.C., add a new step (15) that contains the following 

procedure: 

 Do a check for correct installation of the power off-switching cam on panel (95C) 

 NOTE: Start of Fuel System CDCCL affected section. 

(a) Make sure that the cam partnumber A42509-089 (Post SBF28-28-052) is 

installed (Ref. Fig. 402) (See Figure 2 on Page 5 of this MCN). 

(b) Make sure that the POWER switch on the fueling control panel is in the OFF 

position and the switch-guard is closed. 

(c) Carefully close panel (95C), and make sure that the cam does not touch the 

switch-guard. If necessary, adjust the cam on panel (95C). 

(d) Open panel (95C). 

(e) On the fueling control panel, lift the switch-guard and set the POWER switch to 

ON. 

(f) Close panel (95C), then open it again. 

(g) Make sure that the POWER switch on the fueling control panel is in the OFF 

position and the switch-guard is closed. If necessary, adjust the cam and do the 

adjustment check again. 

NOTE: End of Fuel System CDCCL affected section. 
Manual Change Notification – Maintenance Documentation 

Fokker 28 

APR 15/10 MCNM F28-033 

Page 3 of 5 

 In MM Temporary Revision No. 28-33, add a reference to the new fuel ALI 

procedure in Chapter 28-21-00, and if applicable, a reference to the new 

CDCCL procedure in Chapter 28-21-06. 

 IPC

 For a/c serial numbers 11016 thru 11165, IPC 28-20-03-01 shows the 

correct configuration already. 

 For a/c serial numbers 11166 thru 11241, update as follows: 

 

 Update IPC 28-20-03-01D as follows: 

- Replace the illustration of the Figure shown in your manual by the 

illustration as shown on Page 4 of this MCN. 

- In the partslist, add a new Fig. Item 798, to show the partnumber A42509-

089 of the cam as indicated at View C on Figure 1 of this MCN. 

NOTE: If you have a Continued Airworthiness Documentation Service with Fokker Services, this 

MCN will be included into your manual, at the earliest opportunity. 
Manual Change Notification – Maintenance Documentation 

Fokker 28 

APR 15/10 MCNM F28-033 

Page 4 of 5 

IPC Figure 28-20-03-01D (For a/c serial No. 11166 thru 11241) 

Figure 1 
Manual Change Notification – Maintenance Documentation 

Fokker 28 

APR 15/10 MCNM F28-033 

Page 5 of 5 

Power Off-Switching Cam (AMM 28-21-00 Fig. 201/501 / AMM 28-21-06 Fig. 402) 

Figure 2