# Boeing Alert Service Bulletin 747-53A2907: Revision 1, part 2 of 5

- Rights: © The Boeing Company. Filed by the FAA in regulations.gov docket FAA-2025-4000, the docket of AD 2026-13-03. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [Boeing Alert Service Bulletin 747-53A2907](https://openairdocs.org/service-documents/boeing/747-53a2907.md)
- Title as filed: B747-53A2907 RB_Rev1_Part2--BOEING
- Pages: 37
- PDF: https://openairdocs.org/files/sha256/da/a6/daa662574960664dcea6da9e6f66c09bcc0f86e970f21abfd7d8167b764b07ad
- Page: https://openairdocs.org/service-documents/boeing/747-53a2907/file/daa662574960

## Text

This text is 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 747-53A2907
ALERT  ALERT
This Figure applies only to: Group 1.
STA
1960
STA
1740
STA  - -BL-O
1960
0000000000000000000
BL-0  00000000000
S-23L
2984489
FIGURE 4: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 1 OPTION 2
(SHEET 1 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  63 of 260

### Page 2 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA  STA
1960  1740
BL-0-  -- - BL-0
S-1L  - S-1L
S-2L  • S-2L
S-3L  E  - S-3L
S-4L  - S-4L
S-5L  -S-5L
S-6L  - S-6L
S-7L  - S-7L
S-8L  - S-8L
S-9L -  - S-9L
S-10L  -S-10L
S-11L  - S-11L
S-12L  - S-12L
S-13L  1202  - S-13L
S-14L  - S-14L
S-15L-  - S-15L
S-16L  - S-16L
S-17L  - S-17L
S-18L  - S-18L
S-19L  -S-19L
000  000000000000
S-23L  - S-23L
LEFT SIDE
FWD  MAIN ENTRY
DOOR NO. 4
VIEW LOOKING UP AND OUTBOARD
INSPECTION  2984490
AREA
FIGURE 4: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 1 OPTION 2
(SHEET 2 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  747-53A2907 RB
Export Controlled ECCN: 9E991
See page 1 for details  64 of 260

### Page 3 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA
2180  -BL-O
BL-O  000000000000
8-231--
2984491
FIGURE 4: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 1 OPTION 2
(SHEET 3 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  65 of 260

### Page 4 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA  STA
2180  1960
BL-O  -- BL-O
S-1L  -S- 1L
S-2L  -S-2L
S-3L  - S-3L
S-4L  -S-4L
S-5L  -S-5L
S-6L  - S-6L
S-7L  - S-7L
S-8L  -S-8L
S-9L  - S-9L
S-10L  -S-10L
S-11L  S-11L
S-12L  -S-12L
S-13L  - S-13L
S-14L  -S-14L
S-15L  - S-15L
S-16L  -S-16L
S-17L  - S-17L
S-18L  • S-18L
S-19L  - S-19L
000000000  00000
S-23L  - S-23L
FWD
VIEW LOOKING UP AND OUTBOARD
INSPECTION  2984493
AREA
FIGURE 4: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 1 OPTION 2
(SHEET 4 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  747-53A2907 RB
Export Controlled ECCN: 9E991
See page 1 for details  66 of 260

### Page 5 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
FRAME STA
(TYPICAL)  STRINGER
(TYPICAL)
END OF STRINGER
SKIN
MIRROR
END OF STRINGER
SPLICE
STRINGER
SPLICE  2) 3
END OF STRINGER
SPLICE
STRINGER SPLICE INSPECTION AREA
(TYPICAL)
E
DETAILED  2984494
INSPECTION
FIGURE 4: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 1 OPTION 2
(SHEET 5 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  67 of 260

### Page 6 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
MIRROR
STRINGER SPLICE
TYPICAL CRACK
STRINGER
STRINGER SPLICE  RADIUS FILLERS
STRINGER INSPECTION
(TYPICAL)
A-A
STRINGER
SKIN
> RADIUS FILLER
STRINGER SPLICE
NBD
TYPICAL PRODUCTION OR REPAIR STRINGER SPLICE  B-B  2984495
FIGURE 4: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 1 OPTION 2
(SHEET 6 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  68 of 260

### Page 7 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
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 each airplane.
Step  Task  Name  Identification  Qty  More Data
1  Inspect  S-8L, STA 1740  (a)(d)(e)
Inspect  S-9L, STA 1740  (a) (d) (e)
Inspect  S-10L, STA 1740  (a)(d)(e)
Inspect  S-11L, STA 1740  (a)(d)(e)
Inspect  S-12L, STA 1740  (a)(d)(e)
Inspect  S-13L, STA 1740  (a) (d) (e)
Inspect  S-14L, STA 1740  (a)(d)(e)
Inspect  S-15L, STA 1740  (a) (d) (e)
Inspect  S-16L, STA 1740  (a) (d)(e)
2  Inspect  S-1L, STA 1960  (b) (d) (e)
Inspect  S-2L, STA 1960  (b)(d) (e)
Inspect  S-3L, STA 1960  (b) (d)(e)
Inspect  S-4L, STA 1960  (b)(d) (e)
Inspect  S-5L, STA 1960  (b) (d)(e)
Inspect  S-6L, STA 1960  (b)(d) (e)
Inspect  S-7L, STA 1960  (b)(d) (e)
Inspect  S-8L, STA 1960  (b)(d) (e)
Inspect  S-9L, STA 1960  (b)(d) (e)
Inspect  S-10L, STA 1960  (b)(d) (e)
Inspect  S-11L, STA 1960  (b) (d)(e)
Inspect  S-12L, STA 1960  (b) (d)(e)
FIGURE 4: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 1 OPTION 2
(SHEET 7 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  69 of 260

### Page 8 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
Step  Task  Name  Identification  Qty  More Data
Inspect  S-1L, STA 2180  (c) (d)(e)
Inspect  S-2L, STA 2180  (c)(d) (e)
Inspect  S-3L, STA 2180  (c) (d) (e)
Inspect  S-4L, STA 2180  (c) (d) (e)
Inspect  S-5L, STA 2180  (c) (d) (e)
Inspect  S-6L, STA 2180  (c)(d) (e)
Inspect  S-7L, STA 2180  (c) (d) (e)
Inspect  S-8L, STA 2180  (c) (d) (e)
Inspect  S-9L, STA 2180  (c)(d) (e)
Inspect  S-10L, STA 2180  (c) (d) (e)
Inspect  S-11L, STA 2180  (c) (d) (e)
Inspect  S-12L, STA 2180  (c)(d) (e)
(a) Do a detailed inspection of the visible areas of affected stringers and the stringer splice fitting, forward
and aft of STA 1740, for any crack.
(b)  Do a detailed inspection of the visible areas of affected stringers and the stringer splice fitting, forward
and aft of STA 1960, for any crack.
(c)  Do a detailed inspection of the visible areas of affected stringers and the stringer splice fitting, forward
and aft of STA 2180, for any crack.
(d) Can be a production or repaired stringer splice. The stringer splices could have been repaired with or
without radius fillers.
(e) A repaired stringer splice is defined as Structural Repair Manual (SRM) repairs, Boeing approved unpub-
lished repair, or rework accomplished during production identified in the Significant Rework Log (SRL).
FIGURE 4: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 1 OPTION 2
(SHEET 8 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  747-53A2907 RB
Export Controlled ECCN: 9E991
See page 1 for details  70 of 260

### Page 9 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
This Figure applies only to: Group 1.
STA
2180
STA
1960
1960  STA  →BL-O
STA
1740
BL-0  00000000000
S-23L
2987423
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 1 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  71 of 260

### Page 10 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA  STA
1960  1740
BL-0 -  — BL-0
S-1L  -S-1L
S-2L•  • S-2L
S-3L  -S-3L
S-4L  - S-4L
S-5L  -S-5L
S-6L  - S-6L
S-7L  - S-7L
S-8L  S-8L
S-9L  S-10L  G  S-10L  • S-9L
S-11L  • S-11L
S-12L  - S-12L
S-13L  S-13L
S-14L  - S-14L
S-15L  S-15L
S-16L-  - S-16L
S-17L  - S-17L
S-18L-  - S-18L
S-19L  000000000000K5  - S-19L
S-23L  - S-23L
LEFT SIDE
FWD  MAIN ENTRY
DOOR NO. 4
VIEW LOOKING UP AND OUTBOARD
B  2987425
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 2 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  747-53A2907 RB
Export Controlled ECCN: 9E991
See page 1 for details  72 of 260

### Page 11 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA
2180  _BL-O
STA
1960
BL-Ó  0000
S-23L
2987426
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 3 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  73 of 260

### Page 12 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA  STA
2180  1960
BL-0 -  -- - BL-0
S-1L  - S-1L
S-2L  • S-2 L
S-3L  -S-3L
S-4L  • S-4L
S-5L  - S-5L
S-6L  - S-6L
S-7L  - S-7L
S-8L  -S-8L
S-9L  - S-9L
S-10L  S-10L
S-11L  - S-11L
S-12L  -S-12L
S-13L  S-14L  W  -S-14L  - S-13L
S-15L  - S-15L
S-16L  -S-16L
S-17L  - S-17L
S-18L  •S-18L
S-19L  - S-19L
000  00000000  00000
S-23L  - S-23L
_ FWD
VIEW LOOKING UP AND OUTBOARD
2987428
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 4 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  74 of 260

### Page 13 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA
STRINGER  + 8 LOCATIONS  1741.10
SKIN
A -
S-8L
S-9L
TYPICAL
STRINGER
SPLICE FITTING  FWD
STA
STRINGER  2) 8 LOCATIONS  1741.10  SKIN
S-10L
TYPICAL
STRINGER  SPLICE FITTING  F  FWD
STA
STRINGER  3) 8 LOCATIONS  1741.10  SKIN
S-11L
TYPICAL
STRINGER  2987431
SPLICE FITTING  FWD
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 5 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  75 of 260

### Page 14 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STRINGER  4) 8 LOCATIONS  1741  STA
A →
S-12L  + T
A -  TYPICAL
H  FWD  STRINGER
SPLICE FITTING
STRINGER  5) 8 LOCATIONS  1741.10  STA
A —
S-13L
A -  TYPICAL
STRINGER
FWD  SPLICE FITTING
STA
1741.10
) 16 LOCATIONS
STRINGER
3-141
S-15L
STRINGER
TYPICAL  SPLICE FITTING
FWD  2987432
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 6 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  76 of 260

### Page 15 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA
1741.10
STRINGER  7) 12 LOCATIONS
S-16L-
STRINGER
TYPICAL  SPLICE FITTING
K  FWD
STA
1960
I 16 LOCATIONS
A —
S-1L
S-2L
S-3L
STRINGER
TYPICAL  SPLICE FITTING
FWD
STA
1960
9) 16 LOCATIONS
S-4L -
TYPICAI  STRINGER
SPLICE FITTING  2987434
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 7 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  77 of 260

### Page 16 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA
16 LOCATIONS (10  1961.10
S-5L
STRINGER  STRINGER SPLICE  TYPICAL  FWD
FITTING
N
STA
16 LOCATIONS (1  1960
S-6L
S-7L
STRINGER
STRINGER  SPLICE FITTING
TYPICAL
FWD
STA
STRINGER  12) 12 LOCATIONS  1960
A -
S-8L
S-9L
STRINGER
SPLICE FITTING  TYPICA  FWD  2987435
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 8 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  78 of 260

### Page 17 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
(13) 12 LOCATIONS
STRINGER
A -
S-10L
S-11L
A -
STRINGER SPLICE
TYPICAL  FITTING
FWD
(14) 8 LOCATIONS STA
STRINGER  A -  1960
S-12L  ****+
STRINGER SPLICE
FITTING
TYPICAL
R  FWD
15) 16 LOCATIONS  2181.10  SKIN
STRINGER
TYPICAL  STRINGER SPLICE
FITTING
S  - W D  2987437
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 9 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  79 of 260

### Page 18 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STRINGER  16) 16 LOCATIONS  2181.10  STA  SKIN
S-4L -
+
TYPICAL
FWD
17) 12 LOCATIONS  STA
2181.10
S-5L
-6L
S-8L
S-9L
STRINGER
STRINGER SPLICE
FITTING  TYPICAL
u  FWD
2987438
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 10 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  80 of 260

### Page 19 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
(18) 12 LOCATIONS  STA  FITTING  STRINGER SPLICE
2181.10
S-10L
S-11L
TYPICAL
FWD
(19) 8 LOCATIONS  STA
2181.10
S-12L
TYPICAL
FWD  STRINGER
2987439
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 11 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  81 of 260

### Page 20 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STRINGER
STRINGER SPLICE ~  - RADIUS FILLER
FITTING
SKIN
• RADIUS FILLER
TYPICAL PRODUCTION OR REPAIR STRINGER SPLICE
A-A
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 each airplane.
Step  Task  Name  Identification  Qty  More Data
Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC3ОBH()  (c)
2  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC3ОBH()  (c)
Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC3ОBH()  (c)
4  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC3ОBH()  (c)
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 12 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  82 of 260

### Page 21 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
Step  Task  Name  Identification  Qty  More Data
5  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACBONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC3ОBH()  (с)
Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c) (d) (e)
Install (New)  COLLAR  BACC3ОВH()  (с)
7  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c) (d)(e)
Install (New)  COLLAR  ВАССЗОВН( )  (с)
8  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  ВАССЗОВН( )  (с)
9  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  ВАССЗОВН()  (с)
10  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  ВАССЗОВН()  (с)
11  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  ВАССЗОВН()  (с)
12  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  ВАССЗОВН( )  (с)
13  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  ВАССЗОВН()  (с)
14  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC30BH()  (с)
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 13 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  83 of 260

### Page 22 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
Step  Task  Name  Identification  Qty  More Data
15  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC30BH()  (c)
16  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC30BH( )  (c)
17  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c) (d) (e)
Install (New)  COLLAR  BACC30BH( )  (c)
18  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACB3ONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC30BH( )  (c)
19  Install (Kept)  RADIUS FILLER  (a) (b)
Install (New)  BOLT  BACBONX()K()  (c)(d) (e)
Install (New)  COLLAR  BACC30BH( )  (c)
(a) Install kept radius filler in the location noted during removal.
(b) Apply BMS 5-95 faying surface seal between entire mating surfaces of the radius filler and the stringer.
Refer to SOPM 20-50-19 as an accepted procedure.
(c)  Install similar fasteners to the removed bolt and collar. Refer to 747-8P SRM 51-40-02 as an accepted
procedure.
(a)  Install fasteners wet with BMS 5-95 sealant. Refer to SOPM 20-50-19 as an accepted procedure.
(e)  It is acceptable to oversize fasteners up to 1/64 inch. Refer to 747-8P SRM 51-40-02 as an accepted
procedure. For hole size limits, refer to 747-8P SRM 51-40-05 as an accepted procedure.
FIGURE 5: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - RADIUS FILLER INSTALLATION
(SHEET 14 OF 14)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  747-53A2907 RB
Export Controlled ECCN: 9E991
See page 1 for details  84 of 260

### Page 23 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
This Figure applies only to: Group 1.
STA
1960
STA
1740
STA  - -BL-O
1960
0000000000000000000
BL-0  00000000000
S-23L
2984522
FIGURE 6: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 2
(SHEET 1 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  85 of 260

### Page 24 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA  STA
1960  1740
BL-0-  -- - BL-0
S-1L  - S-1L
S-2L  • S-2L
S-3L  E  - S-3L
S-4L  - S-4L
S-5L  -S-5L
S-6L  - S-6L
S-7L  - S-7L
S-8L  - S-8L
S-9L -  - S-9L
S-10L  -S-10L
S-11L  • S-11L
S-12L  - S-12L
S-13L  1202  - S-13L
S-14L  - S-14L
S-15L-  - S-15L
S-16L  - S-16L
S-17L  - S-17L
S-18L  - S-18L
S-19L  -S-19L
000  000000000000
S-23L  - S-23L
LEFT SIDE
FWD  MAIN ENTRY
DOOR NO. 4
VIEW LOOKING UP AND OUTBOARD
INSPECTION  2984523
AREA
FIGURE 6: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 2
(SHEET 2 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  747-53A2907 RB
Export Controlled ECCN: 9E991
See page 1 for details  86 of 260

### Page 25 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA
2180  -BL-O
BL-O  000000000000
8-231--
2984524
FIGURE 6: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 2
(SHEET 3 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  87 of 260

### Page 26 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA  STA
2180  1960
BL-O  -- BL-O
S-1L  -S- 1L
S-2L  -S-2L
S-3L  - S-3L
S-4L  -S-4L
S-5L  -S-5L
S-6L  - S-6L
S-7L  - S-7L
S-8L  -S-8L
S-9L  - S-9L
S-10L  -S-10L
S-11L  S-11L
S-12L  -S-12L
S-13L  - S-13L
S-14L  -S-14L
S-15L  - S-15L
S-16L  -S-16L
S-17L  - S-17L
S-18L  • S-18L
S-19L  - S-19L
000000000  00000
S-23L  - S-23L
FWD
VIEW LOOKING UP AND OUTBOARD
INSPECTION  2984531
AREA
FIGURE 6: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 2
(SHEET 4 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  747-53A2907 RB
Export Controlled ECCN: 9E991
See page 1 for details  88 of 260

### Page 27 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
FRAME STA
(TYPICAL)  STRINGER
(TYPICAL)
END OF STRINGER
SKIN
MIRROR
END OF STRINGER
SPLICE
STRINGER
SPLICE  2) 3
END OF STRINGER
SPLICE
STRINGER SPLICE INSPECTION AREA
(TYPICAL)
E
DETAILED  2984533
INSPECTION
FIGURE 6: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 2
(SHEET 5 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  89 of 260

### Page 28 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
MIRROR
STRINGER SPLICE
TYPICAL CRACK
STRINGER
STRINGER SPLICE  RADIUS FILLER
STRINGER INSPECTION
(TYPICAL)
A-A
STRINGER
SKIN
STRINGER SPLICE
RADIUS FILLER
INBD
TYPICAL PRODUCTION OR REPAIR STRINGER SPLICE  2984534
B-B
FIGURE 6: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 2
(SHEET 6 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  90 of 260

### Page 29 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
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 each airplane.
Step  Task  Name  Identification  Qty  More Data
1  Inspect  S-8L, STA 1740  (a) (d) (e)
Inspect  S-9L, STA 1740  (a) (d) (e)
Inspect  S-10L, STA 1740  (a)(d)(e)
Inspect  S-11L, STA 1740  (a)(d)(e)
Inspect  S-12L, STA 1740  (a)(d)(e)
Inspect  S-13L, STA 1740  (a) (d) (e)
Inspect  S-14L, STA 1740  (a)(d)(e)
Inspect  S-15L, STA 1740  (a) (d) (e)
Inspect  S-16L, STA 1740  (a) (d)(e)
2  Inspect  S-1L, STA 1960  (b)(d) (e)
Inspect  S-2L, STA 1960  (b)(d) (e)
Inspect  S-3L, STA 1960  (b) (d)(e)
Inspect  S-4L, STA 1960  (b)(d) (e)
Inspect  S-5L, STA 1960  (b) (d)(e)
Inspect  S-6L, STA 1960  (b)(d) (e)
Inspect  S-7L, STA 1960  (b)(d) (e)
Inspect  S-8L, STA 1960  (b)(d) (e)
Inspect  S-9L, STA 1960  (b)(d) (e)
Inspect  S-10L, STA 1960  (b)(d) (e)
Inspect  S-11L, STA 1960  (b) (d)(e)
Inspect  S-12L, STA 1960  (b)(d) (e)
FIGURE 6: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 2
(SHEET 7 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  91 of 260

### Page 30 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
Step  Task  Name  Identification  Qty  More Data
Inspect  S-1L, STA 2180  (c)(d) (e)
Inspect  S-2L, STA 2180  (c)(d) (e)
Inspect  S-3L, STA 2180  (c) (d) (e)
Inspect  S-4L, STA 2180  (c)(d) (e)
Inspect  S-5L, STA 2180  (c) (d) (e)
Inspect  S-6L, STA 2180  (c) (d) (e)
Inspect  S-7L, STA 2180  (c)(d) (e)
Inspect  S-8L, STA 2180  (c) (d) (e)
Inspect  S-9L, STA 2180  (c)(d) (e)
Inspect  S-10L, STA 2180  (c) (d) (e)
Inspect  S-11L, STA 2180  (c) (d) (e)
Inspect  S-12L, STA 2180  (c)(d) (e)
(a) Do a detailed inspection of the visible areas of affected stringers and the stringer splice fitting, forward
and aft of STA 1740, for any crack.
(b)  Do a detailed inspection of the visible areas of affected stringers and the stringer splice fitting, forward
and aft of STA 1960, for any crack.
(c)  Do a detailed inspection of the visible areas of affected stringers and the stringer splice fitting, forward
and aft of STA 2180, for any crack.
(d) Can be a production or repaired stringer splice. The stringer splices could have been repaired with or
without radius fillers.
(e) A repaired stringer splice is defined as Structural Repair Manual (SRM) repairs, Boeing approved unpub-
lished repair, or rework accomplished during production identified in the Significant Rework Log (SRL).
FIGURE 6: LEFT SIDE - S-8L TO S-16L AT STA 1740, S-1L TO S-12L AT STA 1960 AND S-1L TO S-12L
AT STA 2180 - STRINGER DETAILED INSPECTION - CONDITION 2
(SHEET 8 OF 8)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  747-53A2907 RB
Export Controlled ECCN: 9E991
See page 1 for details  92 of 260

### Page 31 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
This Figure applies only to: Group 1.
STA
2180
STA
1960
C
BL-O_  STA
1960
STA
1740
0000000
000000000
B  00000000000  BL-°
— S-23R
2986747
FIGURE 7: RIGHT SIDE - S-8R TO S-16R AT STA 1740, S-1R TO S-12R AT STA 1960 AND S-1R TO S-12R
AT STA 2180 - GENERAL VISUAL INSPECTION
(SHEET 1 OF 13)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  93 of 260

### Page 32 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA  STA
1740  1960
BL-O-  BL-0
S-1R  S-1R
S-2R  S-2R
S-3R  S-3R
S-4R  S-4R
S-5R  S-5R
S-6R  - S-6R
S-7R  S-7R
S-8R  S-8R
S-9R  S-9R
S-10R  S-10R
S-11R  S-11R
S-12R  S-12R
S-13R  S-13R
S-14R  S-14R
S-15R  S-15R
S-16R  S-16R
S-17R  S-17R
S-18R  - S-18R
S-19R  K  - S-19R
000000000  000000
S-23R  - S-23R
RIGHT SIDE
MAIN ENTRY  FWD
DOOR NO. 4
VIEW LOOKING UP AND OUTBOARD
B  2986749
FIGURE 7: RIGHT SIDE - S-8R TO S-16R AT STA 1740, S-1R TO S-12R AT STA 1960 AND S-1R TO S-12R
AT STA 2180 - GENERAL VISUAL INSPECTION
(SHEET 2 OF 13)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  94 of 260

### Page 33 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA
BL-O  2180
STA
1960
0000000000  BL-O
→S-23R
2986757
FIGURE 7: RIGHT SIDE - S-8R TO S-16R AT STA 1740, S-1R TO S-12R AT STA 1960 AND S-1R TO S-12R
AT STA 2180 - GENERAL VISUAL INSPECTION
(SHEET 3 OF 13)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  95 of 260

### Page 34 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA  STA
1960  2180
BL-0 -  --  -- - BL-0
S-1R  -S-1R
S-2R  -S-2R
S-3R-  -S-3R
S-4R  -S-4R
S-5R  -S-5R
S-6R  -S-6R
S-7R  - S-7R
S-8R  -S-8R
S-9R-  -S-9R
S-10R  -S-10R
S- 11R-  -S-11R
S-12R  -S-12R
S-13R  -S-13R
S-14R  -S-14R
S-15R  -S-15R
S-16R  -S-16R
S-17R  -S-17R
S-18R  -S-18R
S-19R  -S-19R
000  0000000  00000
S-23R  -S-23R
FWD
VIEW LOOKING UP AND OUTBOARD
2986758
FIGURE 7: RIGHT SIDE - S-8R TO S-16R AT STA 1740, S-1R TO S-12R AT STA 1960 AND S-1R TO S-12R
AT STA 2180 - GENERAL VISUAL INSPECTION
(SHEET 4 OF 13)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  96 of 260

### Page 35 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA
1741.10  SKIN  8 LOCATIONS 1  • STRINGER
TYPICAL
STRINGER
< FWD  SPLICE FITTING
STA
1741.10  SKIN  8 LOCATIONS (2  > STRINGER
S-10R
TYPICAL
STRINGER
FWD  SPLICE FITTING
STA
1741.10  SKIN  8 LOCATIONS (3) STRINGER
•S-11R
TYPICAL
STRINGER  2986882
FWD  SPLICE FITTING
FIGURE 7: RIGHT SIDE - S-8R TO S-16R AT STA 1740, S-1R TO S-12R AT STA 1960 AND S-1R TO S-12R
AT STA 2180 - GENERAL VISUAL INSPECTION
(SHEET 5 OF 13)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  97 of 260

### Page 36 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STRINGER  4) 8 LOCATIONS  STA
1741
S-12R
TYPICAL
STRINGER
SPLICE FITTING
STA
STRINGER  1741.10  8 LOCATIONS 5  STRINGER
SPLICE FITTING
A
S-13R
FWD
10
) 16 LOCATIONS
STRINGER
S-14R
S-15R
STRINGER
YPICAL  SPLICE FITTING
2986883
FIGURE 7: RIGHT SIDE - S-8R TO S-16R AT STA 1740, S-1R TO S-12R AT STA 1960 AND S-1R TO S-12R
AT STA 2180 - GENERAL VISUAL INSPECTION
(SHEET 6 OF 13)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  98 of 260

### Page 37 (OCR)

REQUIREMENTS BULLETIN 747-53A2907
ALERT  ALERT
STA
1741.10  7) 12 LOCATIONS
STRINGER
- S-16R
SPLICE FITTING  STRINGER  TYPICAL
-WD
STA
1960  ) 16 LOCATIONS
STRINGER
S-1R
• S-2R
S-3R
TYPICAL  STRINGER
SPLICE FITTING
-WD
STA
1960
STRINGER  16 LOCATIONS
— S-4R
TYPICAL  STRINGER
SPLICE FITTING  2986884
FIGURE 7: RIGHT SIDE - S-8R TO S-16R AT STA 1740, S-1R TO S-12R AT STA 1960 AND S-1R TO S-12R
AT STA 2180 - GENERAL VISUAL INSPECTION
(SHEET 7 OF 13)
Original Issue: March 03, 2022
Revision 1 March 14, 2025  Export Controlled ECCN: 9E991  747-53A2907 RB
See page 1 for details  99 of 260

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