Subject Reason Reason for Revision Effectivity Compliance Publications affected Change Note



# I JAN 09/14 

## Manual Change Notification - Maintenance Documentation Fokker 28 MCNM-F28-037 REV 1 Fuel - Introduction ofa Layer of Sealant onto the Parts which attach the FQIS Probe to the Mounting-Flange ofthe Fuel Quantity Tank Unit. This MCN is issued to provide you with the changes on the content(s) ofthe affected manual(s), due to the introduction of SBF28-28-054. In Revision 1 of SBF28-28-054, the accomplishment instructions have been changed, to exclude the one time inspection on the clearance between the FQIS probes and the adjacent structure. This MCNM has been revised accordingly. Refer to SBF28-28-054. Once you have determined the applicability ofthis MCN for one or more ofyour aircraft, incorporate this information into the applicable manual(s) . The F28 Maintenance Manual (MM) . Ifyour manual contains Temporary Revision No. 28-34, then update this TR as follows: Change the title of Fig. 602 "Tankprobe Attachment" to " Fuel Quantity Tank Unit Attachment" In paragraph 1.A., replace the text "tankprobe(s)" by "Fuel Quantity Tank Units" or "(FQTU)" In paragraph 1 .8., change the title to "INSPECTION OF THE TANK PROBE OF THE FQTU" In paragraph 1 .C., change step (1 ), as follows: FQTU attachment inspection (See Fig. 602) (a) Use your hands, to make sure that the attachment ofthe FQTU probe installation is tight. If necessary, correct the FQTU installation (Refer to 28- 41-01 pageblock 401 for corrective action) .

MCNM F28-037 REV 1 Page 1 of4

## Manual Change Notification - Maintenance Documentation Fokker 28 (b) Make sure that the three self-locking nuts (3) including the washers below these nuts and the stud-ends, are fully covered with sealant. (c) Make sure that the layer ofsealant is not damaged . Ifdamaged, then correct the installation ofthe FQTU as necessary (Refer to 28-41-01 pageblock 401 for corrective action)

In paragraph 6.B., delete step 1(a)

**~** In paragraph 6.B., add the following step (2) before the existing step (2}, then re-identify the existing steps accordingly: (2) FQTU attachment inspection (See Fig . 602) (a) Use your hands, to make sure that the attachment ofthe FQTU probe installation is tight. If necessary, correct the FQTU installation (Refer to 28- 41-01 pageblock 401 for corrective action). (b) Make sure that the three self-locking nuts (3) including the washers below these nuts and the stud-ends, are fully covered with sealant. (c) Make sure that the layer of sealant is not damaged. If damaged, then correct the installation ofthe FQTU as necessary (Refer to 28-41-01 pageblock 401 for corrective action). Update Temporary Revision No. 28-54 orAMM 28-41-01 Pageblock 401 (as applicable), as follows: Replace the illustration of Figure 401 by the illustration shown at the end of this MCNM Replace paragraph 2.C., by this text: C. Prepare for Installation (see figure 401) CAUTION: CARE SHOULD BE TAKEN NOT TO SCRATCH, BEND OR SCORE THE OUTER TUBE ASSEMBLY AS SUCH DAMAGE MAY NECESSITATE PROBE REPLACEMENT. NOTE: Start of Fuel System CDCCL affected section . (1) Ensure that the probe is "clean and free ofany deposits and that the mounting holes are unobstructed". (2) Make sure the probe is not corroded , bent or broken. (3) Make sure that the installation ofthe probe to the mounting-flange (1) is tight. If necessary, re-tighten the three self-locking nuts (3) . (4) Apply a layer of sealant (PR 1422B (ref. PPG Industries)) onto the installation ofthe three self-locking nuts (3) . (5) Make sure that the self-locking nuts (3) including the washers below these nuts and the stud-ends are fully covered with a layer ofthe sealant (PR 1422B). NOTE: 

# I JAN 09/14 End of Fuel System CDCCL affected section . MCNM F28-037 REV 1 Page 2 of4

## Manual Change Notification - Maintenance Documentation Fokker 28

NOTE: Ifyou have a Continued Airworthiness Documentation Service with Fokker Services, this MCN will be included into your manual, at the earliest opportunity. NOTE: MCNM-F28-037 Revision 1 supersedes MCNM-F28-037 dated JUN 30/10. Text highlighted by a revision bar indicates: A revision ofthe text introduced with the original issue ofthis MCNM . An introduction of new changes. Text not highlighted by a revision bar was already included in the original issue ofthis MCNM , and is not revised . It is retained for clarity.



# I JAN 09/14 MCNM F28-037 REV 1 Page 3 of4

# I JAN 09/14 

## Manual Change Notification - Maintenance Documentation Fokker 28

1. MOUNTING f!.ANGF

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MCNM F28-037 REV 1 Page 4 of4