# Boeing Alert Requirements Bulletin 757-53A0120 RB: No revision named, part 2 of 2 - Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2023-1214; AD 2024-07-05 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Boeing Alert Requirements Bulletin 757-53A0120 RB](https://openairdocs.org/service-documents/boeing/757-53a0120-rb.md) - Title as filed: 757-53A0120 RB_Part2 - Pages: 11 - PDF: https://openairdocs.org/files/sha256/f7/f2/f7f27dc5fbe91ea1ce39a2f3c3d35a40f3c38dd656327ec70c7043bbea7b8480 - Page: https://openairdocs.org/service-documents/boeing/757-53a0120-rb/file/f7f27dc5fbe9 ## Text Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 (OCR) REQUIREMENTS BULLETIN 757-53A0120 ALERT ALERT INTERCOSTAL TEE CLIP UPPER SKIN ~ OPEN LINER S-14L- HOLE (TYPICAL) S-14 INTERCOSTAL STRAP LOWER HINGE FITTING FITTING• - FRAME WEB SUPPORT TEE - FITTING FASTENER OUTER CHORD- BEAR STRAP ' - FITTING S-15L LOWER SKIN INBD A-A SURFACE HIGH FREQUENCY 0649267 EDDY CURRENT INSPECTION FIGURE 15: LEFT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AROUND AN OPEN LINER HOLE (SHEET 2 OF 3) Original Issue: January 17, 2022 757-53A0120 RB Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. 194 of 204 ### Page 2 The step numbers shown below agree with the numbers shown in the circle symbols in the figure.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)1-FRAME WEBInspect1 (b)1-FRAME WEBInspect2 (a) Do a surface High Frequency Eddy Current (HFEC) inspection of the frame web around the open hole for any crack in accordance with 757 NDT Manual Part 6, 51-00-19. (b) Do a surface High Frequency Eddy Current (HFEC) inspection of the frame web around the fitting fastener for any crack in accordance with 757 NDT Manual Part 6, 51-00-19. FIGURE 15: LEFT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AROUND AN OPEN LINER HOLE (SHEET 3 OF 3) Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. Original Issue: January 17, 2022 757-53A0120 RB 195 of 204 REQUIREMENTS BULLETIN 757-53A0120 ALERTALERT ### Page 3 (OCR) REQUIREMENTS BULLETIN 757-53A0120 ALERT ALERT This Figure applies only to: Group 3. / STA 1640 STA 1640 S-13R LOWER HINGE INTERCOSTAL S-14R S-15R - S-16R - ..... FLOOR S-17R 2974757 FIGURE 16: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - GENERAL VISUAL INSPECTION (SHEET 1 OF 3) Original Issue: January 17, 2022 757-53A0120 RB Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. 196 of 204 ### Page 4 (OCR) REQUIREMENTS BULLETIN 757-53A0120 ALERT ALERT INTERCOSTAL TEE CLIP UPPER SKIN - S-14R S-14 - INTERCOSTAL STRAP LOWER HINGE FITTING FRAME WEB 1 LINER HOLE (TYPICAL) • SUPPORT TEE OUTER CHORD FITTING- BEAR STRAP • S-15R LOWER SKIN INBD A-A • GENERAL VISUAL 2974761 INSPECTION FIGURE 16: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - GENERAL VISUAL INSPECTION (SHEET 2 OF 3) Original Issue: January 17, 2022 757-53A0120 RB Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. 197 of 204 ### Page 5 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)1-FRAME WEBInspect1 (a) Do a General Visual Inspection of the frame web on the aft side for existing liner hole. FIGURE 16: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - GENERAL VISUAL INSPECTION (SHEET 3 OF 3) Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. Original Issue: January 17, 2022 757-53A0120 RB 198 of 204 REQUIREMENTS BULLETIN 757-53A0120 ALERTALERT ### Page 6 (OCR) REQUIREMENTS BULLETIN 757-53A0120 ALERT ALERT This Figure applies only to: Group 3. / STA 1640 STA 1640 S-13R - LOWER HINGE INTERCOSTAL S-14R S-15R • S-16R - ............ FLOOR S-17R 2974759 FIGURE 17: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AROUND A PLUGGED LINER HOLE (SHEET 1 OF 3) Original Issue: January 17, 2022 757-53A0120 RB Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. 199 of 204 ### Page 7 (OCR) REQUIREMENTS BULLETIN 757-53A0120 ALERT ALERT INTERCOSTAL TEE CLIP • UPPER SKIN S-14R S-14 INTERCOSTAL STRAP LOWER HINGE FITTING FRAME WEB - WITH ONE A - SUPPORT TEE FASTENER OR WITH TWO FASTENERS OUTER CHORD FITTING BEAR STRAP S-15R A-A LOWER SKIN FITTING INBD FASTENER PLUGGED LINER HOLE • FITTING (TYPICAL) INBD INBD FITTING WITH ONE WITH TWO FASTENER FASTENERS SURFACE HIGH FREQUENCY 2974762 EDDY CURRENT INSPECTION FIGURE 17: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AROUND A PLUGGED LINER HOLE (SHEET 2 OF 3) Original Issue: January 17, 2022 Export Controlled ECCN: 9E991 757-53A0120 RB Copyright © Unpublished Work - See page 1 for details. 200 of 204 ### Page 8 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)1-FRAME WEBInspect1 (a) Do a surface High Frequency Eddy Current (HFEC) inspection of the frame web around the fitting fastener and the fastener in the plugged liner hole (if an adjacent second fastener exists) for any crack in accordance with 757 NDT Manual Part 6, 51-00-19. (b) There can be 1 or 2 fastener hole locations to inspect. FIGURE 17: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AROUND A PLUGGED LINER HOLE (SHEET 3 OF 3) Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. Original Issue: January 17, 2022 757-53A0120 RB 201 of 204 REQUIREMENTS BULLETIN 757-53A0120 ALERTALERT ### Page 9 (OCR) REQUIREMENTS BULLETIN 757-53A0120 ALERT ALERT This Figure applies only to: Group 3. STA 1640 STA 1640 S-13R 000 LOWER- HINGE INTERCOSTAL S-14R - S-15R ...° S-16R - - oooooooo FLOOR S-17R 2975793 FIGURE 18: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AROUND AN OPEN LINER HOLE (SHEET 1 OF 3) Original Issue: January 17, 2022 757-53A0120 RB Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. 202 of 204 ### Page 10 (OCR) REQUIREMENTS BULLETIN 757-53A0120 ALERT ALERT INTERCOSTAL TEE CLIP • UPPER SKIN •S-14R OPEN LINER S-14 HOLE (TYPICAL) INTERCOSTAL STRAP LOWER HINGE FITTING FRAME WEB - FITTING SUPPORT TEE • FITTING FASTENER OUTER CHORD FITTING BEAR STRAP S-15R LOWER SKIN INBD A-A SURFACE HIGH FREQUENCY 2975796 EDDY CURRENT INSPECTION FIGURE 18: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AROUND AN OPEN LINER HOLE (SHEET 2 OF 3) Original Issue: January 17, 2022 757-53A0120 RB Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. 203 of 204 ### Page 11 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)1-FRAME WEBInspect1 (b)1-FRAME WEBInspect2 (a) Do a surface High Frequency Eddy Current (HFEC) inspection of the frame web around the open hole for any crack in accordance with 757 NDT Manual Part 6, 51-00-19. (b) Do a surface High Frequency Eddy Current (HFEC) inspection of the frame web around the fitting fastener for any crack in accordance with 757 NDT Manual Part 6, 51-00-19. FIGURE 18: RIGHT SIDE - FUSELAGE FRAME WEB AT STA 1640 BETWEEN S-14 AND S-15 - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION AROUND AN OPEN LINER HOLE (SHEET 3 OF 3) Export Controlled ECCN: 9E991 Copyright © Unpublished Work - See page 1 for details. Original Issue: January 17, 2022 757-53A0120 RB 204 of 204 REQUIREMENTS BULLETIN 757-53A0120 ALERTALERT --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). 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