## 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 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.

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 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.

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 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.

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 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.

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 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.

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 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.

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 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.

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 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.

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 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.

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 Document ation 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