Boeing Alert Requirements Bulletin 757-53A0123 RB: No revision named, part 2 of 4, text

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Page 1OCROpen in PDF

REQUIREMENTS BULLETIN 757-53A0123

ALERT ALERT STA STA 1640 1640 STA 1620 0006

- S-8L

- S-9L

- S-10L S-

- S-13L

- LOWER HINGE

INTERCOSTAL S-14L S-16L

• FLOOR

- S-17L (VIEW IN THE OUTBOARD DIRECTION) FWD 3032170 FIGURE 7: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-11L AND S-13L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 6 (SHEET 1 OF 3) Original Issue: March 13, 2024 Export Controlled ECCN: 9E991 757-53A0123 RB See page 1 for details 111 of 178

Page 2OCROpen in PDF

REQUIREMENTS BULLETIN 757-53A0123

ALERT ALERT STA 1640

- S-11L FWD

- S-13L COVER PLATE (VIEW IN THE OUTBOARD DIRECTION) FRAME INNER CHORD FRAME INNER CHORD

COVER PLATE PLATE COVER A-A (VIEW IN THE INBOARD DIRECTION) 3032174 2 SURFACE HFEC INSPECTION B-B FIGURE 7: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-11L AND S-13L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 6 (SHEET 2 OF 3) Original Issue: March 13, 2024 757-53A0123 RB Export Controlled ECCN: 9E991 See page 1 for details 112 of 178

Page 3Open 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)--FRAME INNER CHORD Inspect1

(a) Do a surface HFEC inspection of the frame inner chord around each of the three fasteners for any crack in accordance with 757 NDT Manual Part 6, 51-00-19.

FIGURE 7: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-11L AND S-13L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 6 (SHEET 3 OF 3) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 113 of 178 REQUIREMENTS BULLETIN 757-53A0123

ALERTALERT

Page 4OCROpen in PDF

REQUIREMENTS BULLETIN 757-53A0123

ALERT ALERT This Figure applies only to: Group 1-3.

STA STA 1640 1640 STA 1620 100001 000 ............ - S-8L

- S-9L 0000 - S-10L

• S-11L

- S-13L

- LOWER HINGE

INTERCOSTAL

• S-14L 160000 S-16L

• FLOOR

- S-17L (VIEW IN THE OUTBOARD DIRECTION) -WD LILATOE FIGURE 8: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-13L AND S-14L - SUBSURFACE LOW FREQUENCY EDDY CURRENT (LFEC) INSPECTION - LOCATION 7 (SHEET 1 OF 4) Original Issue: March 13, 2024 757-53A0123 RB Export Controlled ECCN: 9E991 See page 1 for details 114 of 178

Page 5OCROpen in PDF

REQUIREMENTS BULLETIN 757-53A0123

ALERT ALERT

INNER CHORD STRAP

LOWER HINGE

INTERCOSTAL STRAP

FRAME INNER CHORD S-14L

INTERCOSTAL STRAP (SOME PARTS ARE REMOVED) 3051177 FIGURE 8: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-13L AND S-14L - SUBSURFACE LOW FREQUENCY EDDY CURRENT (LFEC) INSPECTION - LOCATION 7 (SHEET 2 OF 4) Original Issue: March 13, 2024 Export Controlled ECCN: 9E991 757-53A0123 RB See page 1 for details 115 of 178

Page 6OCROpen in PDF

REQUIREMENTS BULLETIN 757-53A0123

ALERT ALERT

INNER CHORD

FRAME INNER CHORD STRAP

LOWER HINGE

INTERCOSTAL STRAP

0.08- -0.045 (SOME PARTS ARE REMOVED) A-A SUBSURFACE LFEC INSPECTION 3044118 FIGURE 8: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-13L AND S-14L - SUBSURFACE LOW FREQUENCY EDDY CURRENT (LFEC) INSPECTION - LOCATION 7 (SHEET 3 OF 4) Original Issue: March 13, 2024 757-53A0123 RB Export Controlled ECCN: 9E991 See page 1 for details 116 of 178

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)(b)--FRAME INNER CHORD Inspect1

(a) Do a subsurface LFEC inspection of the frame inner chord through the inner chord strap for any crack in accordance with 757 NDT Manual Part 6, 51-00-23.

(b) AF-4087 is an optional smaller LFEC probe that can be used around fasteners with a short edge distance.

FIGURE 8: LEFT SIDE - FUSELAGE FRAME INNER CHORD AT STA 1640 BETWEEN S-13L AND S-14L - SUBSURFACE LOW FREQUENCY EDDY CURRENT (LFEC) INSPECTION - LOCATION 7 (SHEET 4 OF 4) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 117 of 178 REQUIREMENTS BULLETIN 757-53A0123

ALERTALERT

Page 8OCROpen in PDF

REQUIREMENTS BULLETIN 757-53A0123

ALERT ALERT STA STA 1640 1640 STA 1620

- S-8L

- S-9L 10000 • S-10L

• S-11L 00 - S-13L

- LOWER HINGE

INTERCOSTAL

• S-14L S-16L → FLOOR

- S-17L (VIEW IN THE OUTBOARD DIRECTION) FWD 3032173 FIGURE 9: LEFT SIDE - FUSELAGE FRAME WEB AND OUTER CHORD AT STA 1640 BELOW S-13L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 8, AIRPLANES WITH

A BACKUP FITTING INSTALLED (SHEET 1 OF 3) Original Issue: March 13, 2024 757-53A0123 RB Export Controlled ECCN: 9E991 See page 1 for details 118 of 178

Page 9OCROpen in PDF

REQUIREMENTS BULLETIN 757-53A0123

ALERT ALERT

- S-13L

CHEM MILL POCKET (THE CHEM MILL

FEATURE MAY NOT

EXIST ON SOME

AIRPLANE CONFIGURATIONS) 0.50

0.50 BACKUP

FITTING FRAME

WEB FRAME OUTER CHORD LOWER HINGE

INTERCOSTAL

INBD (VIEW IN THE AFT DIRECTION) A-A FRAME

SUPPORT OUTER BACKUP

FITTING SUPPORI CHORD FITTING

FITTING

0.50 FRAME WEB

INBI BACKUP FITTING FRAME 0.50 OUTER CHORD

FRAME FWD WEB (VIEW IN THE DOWN DIRECTION) (VIEW IN THE OUTBOARD DIRECTION)

B-B C-C I SURFACE HFEC INSPECTION 3032179 * SUBSURFACE LFEC INSPECTION FIGURE 9: LEFT SIDE - FUSELAGE FRAME WEB AND OUTER CHORD AT STA 1640 BELOW S-13L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 8, AIRPLANES WITH

A BACKUP FITTING INSTALLED (SHEET 2 OF 3) Original Issue: March 13, 2024 757-53A0123 RB Export Controlled ECCN: 9E991 See page 1 for details 119 of 178

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)(b)--FRAME WEBInspect1

(c)--FRAME OUTER CHORD Inspect2

(d)(e)--FRAME OUTER CHORD Inspect3

(a) Do a surface HFEC inspection of the frame web along the edge of the backup fitting for any crack in accordance with 757 NDT Manual Part 6, 51-00-19.

(b) For airplanes with a chem-milled pocket in the frame web, inspect along the edge of the chem-milled step.

For airplanes without a chem-milled step, use the backup fitting as a guide to inspect the frame web.

(c) Do a surface HFEC inspection of the frame outer chord edge for any crack in accordance with 757 NDT Manual Part 6, 51-00-19. Use special probe, AXTPN-95-5 or AXPN-95-5.

(d) Do a subsurface LFEC inspection of the outer chord outboard flange through the backup fitting for any crack in accordance with 757 NDT Manual Part 6, 51-00-23.

(e) Outer chord outboard flange is 0.16 inches thick and the backup fitting is 0.10 inches thick.

FIGURE 9: LEFT SIDE - FUSELAGE FRAME WEB AND OUTER CHORD AT STA 1640 BELOW S-13L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 8, AIRPLANES WITH

A BACKUP FITTING INSTALLED (SHEET 3 OF 3) Export Controlled ECCN: 9E991 See page 1 for details Original Issue: March 13, 2024 757-53A0123 RB 120 of 178 REQUIREMENTS BULLETIN 757-53A0123

ALERTALERT

Page 11OCROpen in PDF

REQUIREMENTS BULLETIN 757-53A0123

ALERT ALERT STA STA 1640 1640 STA 1620

- S-8L

- S-9L

- S-10L

• S-1

- S-13L

- LOWER HINGE

INTERCOSTAL

• S-14L

• S-16L

• FLOOR

- S-17L (VIEW IN THE OUTBOARD DIRECTION) FWD FIGURE 10: LEFT SIDE - FUSELAGE FRAME WEB AND OUTER CHORD AT STA 1640 BELOW S-13L - SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 8, AIRPLANES WITHOUT

A BACKUP FITTING INSTALLED (SHEET 1 OF 3) Original Issue: March 13, 2024 757-53A0123 RB Export Controlled ECCN: 9E991 See page 1 for details 121 of 178

Page 12OCROpen in PDF

REQUIREMENTS BULLETIN 757-53A0123

ALERT ALERT

- S-13L

0.50 O. .50

SUPPORT

FITTING FRAME OUTER CHORD

FRAME WEB LOWER HINGE

INTERCOSTAL (VIEW IN THE AFT DIRECTION) A-A A SURFACE HFEC INSPECTION 3032177 FIGURE 10: LEFT SIDE - FUSELAGE FRAME WEB AND OUTER CHORD AT STA 1640 BELOW S-13L- SURFACE HIGH FREQUENCY EDDY CURRENT (HFEC) INSPECTION - LOCATION 8, AIRPLANES WITHOUT

A BACKUP FITTING INSTALLED (SHEET 2 OF 3) Original Issue: March 13, 2024 Export Controlled ECCN: 9E991 757-53A0123 RB See page 1 for details 122 of 178

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