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Boeing Alert Requirements Bulletin 737-57A1358 RB: No revision named, part 2 of 2

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© The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2026-2716; AD 2026-21-07 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.

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Page 1OCROpen in PDF

REQUIREMENTS BULLETIN 737-57A1358

ALERT ALERT

MAIN TRACK

RIB ASSEMBLY 04€00 34€Đ00 ATTACH STRAP • NBD ENGINE FUEL SHUTOFF VALVE AÇCESS

PANEL IS SHOWN IN CLOSED POSITION

FORM-IN-PLACE GASKET

APPLICATION AREA FORM-IN-PLACE GASKET AND 3089145

SEALANT APPLICATION AREA FIGURE 4: RIGHT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - FORM-IN-PLACE (FIP)

GASKET REPLACEMENT (SHEET 2 OF 5) Original Issue: November 17, 2025 Export Controlled ECCN: 9E991 737-57A1358 RB See page 1 for details 34 of 63

Page 2Open in PDF

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure.

More DataQtyIdentificationNameTaskStep

(a)(b)--SEALANT (FORM-IN-

PLACE GASKET) Remove1

(b)(c)--SEALANTRemove2

(b)(d)--SEALANTRemove3

(e)--CORROSION INHIBIT-

ING COMPOUND Remove4

(f)(g)--SURFACEClean5

(h)(i)-BMS 5-45, CLASS B- 1/2 OR B-2 SEALANTApply6

(h)(j)-BMS 5-45, CLASS B- 1/2 OR B-2 SEALANTApply7

(k)(l)(m)-FREKOTE 710-NCPARTING AGENTApply8

(n)(o)-BMS 5-45, CLASS B- 1/2

SEALANT (FORM-IN-

PLACE GASKET) Apply9

(p)(q)1621BBENGINE FUEL SHUT-

OFF VALVE ACCESS PANEL Open10

(b)(r)1621BBENGINE FUEL SHUT-

OFF VALVE ACCESS PANEL Clean11

(b)(r)(s)--SURFACEClean

(b)(t)-BMS 5-45, CLASS B- 1/2 SEALANTRemove12

(a) Remove the existing FiP gasket on the seal rib assembly, main track rib assembly, and attach strap.

(b) Use a non-metallic tool and make sure not to damage the surface of the metal or protective coating. Refer to SOPM 20-50-19 as an accepted procedure.

(c) Remove existing sealant in the space between the seal rib assembly and adjacent attach strap.

(d) Remove existing sealant in the space between the main track rib assembly and adjacent attach strap.

Make sure all sealant is removed from the surround structure at the aft outboard side of the engine fuel shutoff valve access panel. Remove sealant located on the underside of the main track rib assembly flange and attach strap.

(e) Remove existing corrosion inhibiting compound from the shown surfaces where a FiP gasket or sealant was applied. Refer to SOPM 20-50-19 as an accepted procedure.

(f) Clean the surfaces of the seal rib assembly, main track rib assembly, and attach strap which have had the FiP gasket or sealant removed. Refer to SOPM 20-50-19 as an accepted procedure.

FIGURE 4: RIGHT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - FORM-IN-PLACE (FIP)

GASKET REPLACEMENT (SHEET 3 OF 5) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: November 17, 2025 737-57A1358 RB 35 of 63 REQUIREMENTS BULLETIN 737-57A1358

ALERTALERT

Page 3Open in PDF

More DataQtyIdentificationNameTaskStep

(g) If the surface finish on the structure in the shown area is cracked or shows signs of abrasion, repair chemical and solvent resistant finish. Refer to SOPM 20-41-02 as an accepted procedure.

(h) BMS 5-45 shrinks when it cures, make sure that the sealant stays attached to the structure(s) after it cures. It is optional to co-cure the sealant with the FiP gasket. Refer to SOPM 20-50-19 as an accepted procedure.

(i) Fill the space between the seal rib assembly and adjacent attach strap flush with sealant.

(j) At the aft outboard side of the engine fuel shutoff valve access panel surround structure, build up the sealant flush to fill the space between the flange of the main track rib assembly and adjacent attach strap.

It is permitted to apply sealant to the underside of these parts to secure the sealant. Refer to Boeing Service Bulletin 737-57A1358 APPENDIX G for example application of main track rib assembly attach strap space sealant on the right wing engine fuel shutoff valve access panel.

(k) Do not apply parting agent to the surround structure of the engine fuel shutoff valve access panel.

(l) Frekote 710-NC is permitted to be used as a parting agent.

(m) If Frekote 710-NC is used as a parting agent, do as follows:

– Apply two coats to the surfaces of the engine fuel shutoff valve access panel which are in contact with the surround structure. Apply parting agent to the access panel only. Allow 5 to 10 minutes between each application. Allow 20 minutes after the second application before closing the access panel. Extend the application area of parting agent to be more than 2 inch larger than the fay surface area to allow for the squeeze out. Parting agent can be applied to the entire surface of the engine fuel shutoff valve access panel. Do not touch applied parting agent.

(n) Make a FiP gasket. Apply sealant smooth and flat at the fay surface of the engine fuel shutoff valve access panel surround structure. Enough sealant should be applied to achieve continuous squeeze-out along the edges of the panel. After the access panel has latched close, continue to press up on the panel with the same force used to latch the panel. Continue this pressure for 15 seconds to allow excess sealant to squeeze out fully. Do not press up with more force than required to latch the panel or voids will be created in the FiP gasket and the fluid leak test will fail.

(o) After closing the engine fuel shutoff valve access panel, while the FiP gasket sealant is still wet, remove the sealant from the spaces between the edges of both the access panel and surrounding structure, except for the sealant at the aft edge of the engine fuel shutoff valve access panel. Allow the sealant to cure.

Refer to SOPM 20-50-19 as an accepted procedure.

(p) After the sealant has cured, cycle the engine fuel shutoff valve access panel to break it free from the sealant. It is acceptable to use a skin wedge to break the panel free. After cycling the panel, it should open without assistance. Make sure that the sealant bonds to the access panel surround structure and not the access panel. Trim excess cured sealant from door structure as required.

(q) After sealant has cured and door has been re-opened, remove and apply new parting agent. Refer to SOPM 20-50-19 as an accepted procedure. In lieu of subsequent re-applications of parting agent every time the door is re-opened, petrolatum that meets VV-P-236 specification or Krytox 240AC can be applied to the panel as a post-cure lubricant. If petrolatum is applied to the panel after the sealant has cured, it must be wiped off with a lint-free rag leaving behind a thin film. If Krytox 240AC is used, it does not have to be wiped off.

FIGURE 4: RIGHT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - FORM-IN-PLACE (FIP)

GASKET REPLACEMENT (SHEET 4 OF 5) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: November 17, 2025 737-57A1358 RB 36 of 63 REQUIREMENTS BULLETIN 737-57A1358

ALERTALERT

Page 4Open in PDF

More DataQtyIdentificationNameTaskStep

(r) Remove any sealant adhering to the access panel or excess sealant squeeze that extends into the panel opening from the surround structure.

(s) The FiP gasket and sealant must be removed and applied again if the sealing surface on the surround structure of the engine fuel shutoff valve access panel does not meet all the conditions that follow:

1. No structure is visible in the FiP gasket area.

2. All sealant is evenly distributed.

3. No sealant is added after the initial sealant application time expires.

4. Any small cavities or depressions in the sealing surface which are less than or equal to 1/4 inch in width, and 1/8 inch in length, are permitted if the cavities or depressions do not extend across the full width of the sealed surface and maintain a minimum sealing surface of 1/4 inch.

5. The outboard aft corner of the gasket area is sealed and attached to the flange of the main track rib assembly and attach strap.

(t) Remove any excess FiP gasket sealant from the notch at the aft edge of the engine fuel shutoff valve access panel and forward of the lower skin panel.

FIGURE 4: RIGHT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - FORM-IN-PLACE (FIP)

GASKET REPLACEMENT (SHEET 5 OF 5) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: November 17, 2025 737-57A1358 RB 37 of 63 REQUIREMENTS BULLETIN 737-57A1358

ALERTALERT

Page 5OCROpen in PDF

REQUIREMENTS BULLETIN 737-57A1358

ALERT ALERT This Figure applies only to: Group 2.

SLAT STA <

36.00

• D€€

SLAT STA

36.00

UPPER SKIN PANEL

MAIN TRACK

RIB ASSEMBLY

LOWER SKIN ATTACH

PANEL STRAP

ENGINE FUEL SHUTOFF VALVE ACCESS

PANEL SHOWN IN OPEN POSITION (VIEW IN THE UP DIRECTION)

INSPECTION AREA DETAILED A-A INB AREA TO BE 3089223

CLEANED FIGURE 5: LEFT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - PRE-FORMED SEAL AREA

DETAILED INSPECTION (DET) (SHEET 1 OF 3) Original Issue: November 17, 2025 737-57A1358 RB Export Controlled ECCN: 9E991 See page 1 for details 38 of 63

Page 6OCROpen in PDF

REQUIREMENTS BULLETIN 737-57A1358

ALERT ALERT _ MAIN TRACK RIB ASSEMBLY ATTACH STRAP NE

ENGINE FUEL SHUTOFF VALVE

ACCESS PANEL IS NOT SHOWN AREA TO BE 3089302 _ CLEANED FIGURE 5: LEFT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - PRE-FORMED SEAL AREA

DETAILED INSPECTION (DET) (SHEET 2 OF 3) Original Issue: November 17, 2025 Export Controlled ECCN: 9E991 737-57A1358 RB See page 1 for details 39 of 63

Page 7Open in PDF

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure.

More DataQtyIdentificationNameTaskStep

(a)--CORROSION INHIBIT-

ING COMPOUND Remove1

(b)--SURFACEClean2

(c)(d)--SURFACEInspect3

(a) Remove existing corrosion inhibiting compound from the shown areas of the seal rib assembly, main track rib assembly, and attach strap. Refer to SOPM 20-50-19 as an accepted procedure.

(b) Clean the shown areas and make sure there is no loose dirt, unwanted grease, or oil on the surface of the substructure or existing pre-formed seal. Refer to SOPM 20-30-03 as an accepted procedure.

(c) Do a DET of the pre-formed seal area shown on the seal rib assembly, attach strap, and main track rib assembly in areas which contact the engine fuel shutoff valve access panel for any damage on the preformed seal.

(d) Pre-formed seal damage is defined as:

1. Tears or rips which extend across the full width of the pre-formed seal.

2. Partial or complete disbonding of the pre-formed seal from the access door.

FIGURE 5: LEFT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - PRE-FORMED SEAL AREA

DETAILED INSPECTION (DET) (SHEET 3 OF 3) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: November 17, 2025 737-57A1358 RB 40 of 63 REQUIREMENTS BULLETIN 737-57A1358

ALERTALERT

Page 8OCROpen in PDF

REQUIREMENTS BULLETIN 737-57A1358

ALERT ALERT This Figure applies only to: Group 2.

SLAT STA

36.00

SLAT STA

36.00

UPPER SKIN PANEL

SEAL RIB

•ASSEMBLY

MAIN TRACK

RIB ASSEMBLY

LOWER SKIN ATTACH

PANEL STRAP

ENGINE FUEL SHUTOFF VALVE ACCESS

PANEL SHOWN IN OPEN POSITION

DETAILED (VIEW IN THE UP DIRECTION) INSPECTION AREA AREA TO BE A-A INBD 3089308

CLEANED FIGURE 6: RIGHT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - PRE-FORMED SEAL AREA

DETAILED INSPECTION (DET) (SHEET 1 OF 3) Original Issue: November 17, 2025 Export Controlled ECCN: 9E991 737-57A1358 RB See page 1 for details 41 of 63

Page 9OCROpen in PDF

REQUIREMENTS BULLETIN 737-57A1358

ALERT ALERT

MAIN TRACK RIB ASSEMBLY ~ ATTACH STRAP

ENGINE FUEL SHUTOFF VALVE

ACCESS PANEL IS NOT SHOWN AREA TO BE 3089309

CLEANED FIGURE 6: RIGHT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - PRE-FORMED SEAL AREA

DETAILED INSPECTION (DET) (SHEET 2 OF 3) Original Issue: November 17, 2025 Export Controlled ECCN: 9E991 737-57A1358 RB See page 1 for details 42 of 63

Page 10Open in PDF

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY numbers shown below are the number of parts necessary for this figure.

More DataQtyIdentificationNameTaskStep

(a)--CORROSION INHIBIT-

ING COMPOUND Remove1

(b)--SURFACEClean2

(c)(d)--SURFACEInspect3

(a) Remove existing corrosion inhibiting compound from the shown areas of the seal rib assembly, main track rib assembly, and attach strap. Refer to SOPM 20-50-19 as an accepted procedure.

(b) Clean the shown areas and make sure there is no loose dirt, unwanted grease, or oil on the surface of the substructure or existing pre-formed seal. Refer to SOPM 20-30-03 as an accepted procedure.

(c) Do a DET of the pre-formed seal area shown on the seal rib assembly, attach strap, and main track rib assembly in areas which contact the engine fuel shutoff valve access panel for any damage on the preformed seal.

(d) Pre-formed seal damage is defined as:

1. Tears or rips which extend across the full width of the pre-formed seal.

2. Partial or complete disbonding of the pre-formed seal from the access door.

FIGURE 6: RIGHT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - PRE-FORMED SEAL AREA

DETAILED INSPECTION (DET) (SHEET 3 OF 3) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: November 17, 2025 737-57A1358 RB 43 of 63 REQUIREMENTS BULLETIN 737-57A1358

ALERTALERT

Page 11OCROpen in PDF

REQUIREMENTS BULLETIN 737-57A1358

ALERT ALERT This Figure applies only to: Group 2.

SLAT STA <

36.00

SLAT STA

36.00

UPPER SKIN PANEL

SEAL RIB

ASSEMBLY

MAIN TRACK

RIB ASSEMBLY 14€8 10 13) ATTACH 143U13 LOWER SKIN

STRAP PANEL

ENGINE FUEL SHUTOFF VALVE ACCESS

PANEL SHOWN IN OPEN POSITION (VIEW IN THE UP DIRECTION)

REMOVABLE FAY SEAL APPLICATION AREA A-A INE REMOVABLE FAY SEAL AND 3091703

SEALANT APPLICATION AREA FIGURE 7: LEFT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - REMOVEABLE FAY SEAL

REPLACEMENT (SHEET 1 OF 5) Original Issue: November 17, 2025 737-57A1358 RB Export Controlled ECCN: 9E991 See page 1 for details 44 of 63

Page 12OCROpen in PDF

REQUIREMENTS BULLETIN 737-57A1358

ALERT ALERT

- MAIN TRACK

RIB ASSEMBLY 14 3 013 14130฿

ATTACH STRAP INBD

VIEW IN THE UP DIRECTION 112 SILICONE GASKET SLAT STA 9/11/12

36.00

ENGINE FUEL SHUTOFF VALVE ACCESS

PANEL IS SHOWN IN OPEN POSITION

PRE-FORMED SEAL (VIEW IN THE UP DIRECTION)

APPLICATION AREA

REMOVABLE FAY SEAL

APPLICATION AREA REMOVABLE FAY SEAL AND 3091704

SEALANT APPLICATION AREA FIGURE 7: LEFT WING - ENGINE FUEL SHUTOFF VALVE ACCESS PANEL - REMOVEABLE FAY SEAL

REPLACEMENT (SHEET 2 OF 5) Original Issue: November 17, 2025 Export Controlled ECCN: 9E991 See page 1 for details 737-57A1358 RB 45 of 63

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