# Boeing Alert Requirements Bulletin MD11-53A088 RB: No revision named

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- Title as filed: MD11-53A088-RB  00--
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### Page 1

Commercial
Airplanes
MD11
Requirements Bulletin
ALERT
Number: MD11-53A088 RB
Original Issue: March 06, 2020
ATA System: 5314
SUBJECT: FUSELAGE - Center Fuselage Main Frame - Overwing Floor Beams - Inspection
Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15
CFR 300-774). An export license may be required before it is used for development, production or use by foreign
persons from specific countries. The controller of this data has the individual responsibility to abide by all export
laws.
9E991ECCN:
Copyright © 2020 Boeing.
Unpublished Work. All Rights Reserved.
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document
are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The
Boeing Company.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner,
BBJ, DC-8, DC-9, DC-10, KC-10, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and
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connection with this document unless provided in writing by Boeing.
Original Issue: March 06, 2020
MD11-53A088 RB
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3.0

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ALERTALERT
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Table of Contents
1 . E F F E C T I V I T Y  ................................................ 5
A. Airplanes ................................................ 5
B . S p a r e s  A f f e c t e d  ............................................ 6
2. CONCURRENT REQUIREMENTS ..................................... 6
3 . C O M P L I A N C E  ................................................ 6
4. APPROVAL ................................................. 8
5. ACCOMPLISHMENT INSTRUCTIONS .................................. 9
A. General Information .......................................... 9
B. Work Instructions ........................................... 1 0
FIGURE 1: LEFT SIDE - GENERAL VISUAL INSPECTION OF THE OVERWING FLOOR BEAMS . . 14
FIGURE 2: RIGHT SIDE - GENERAL VISUAL INSPECTION OF THE OVERWING  FLOOR BEAMS . 16
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECT ION OF THE OVERWING
FLOOR BEAMS ........................................ 1 8
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS ........................................ 2 8
FIGURE 5: LEFT SIDE - DETAILED INSPECTION OF OVERWING FLOOR BEAM  SUPPORTS . . . 38
FIGURE 6: RIGHT SIDE - DETAILED INSPECTION OF OVERWING FLOOR BEA M SUPPORTS . . 41
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ALERTALERT
BLANK PAGE

### Page 5

Commercial
Airplanes
MD11
Requirements Bulletin
ALERT
Number: MD11-53A088 RB
Original Issue: March 06, 2020
ATA System: 5314
SUBJECT: FUSELAGE - Center Fuselage Main Frame - Overwing Floor Beams - Inspection
THIS DOCUMENT IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN
PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS DOCUMENT
TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE
NEW OWNER. THIS IS AN ENHANCED REQUIRED FOR COMPLIANCE DOCUMENT. THE BOEING
PROCESSES USED TO CREATE THE SERVICE BULLETIN (SB) AND THE REQUIREMENTS BULLETIN
(RB) ENSURE THAT THE INFORMATION BETWEEN "RC START" AND "RC END" IN THE SB ARE IDENTICAL
TO THE INFORMATION IN THE SAME SECTIONS (COMPLIANCE, WORK INSTRUCTIONS…) OF THE RB
WHICH THE SB REFERS TO AS THE RELATED DOCUMENT.
1. Effectivity
A. Airplanes
This bulletin is applicable to MD-11, MD-11F Airplane(s), line number(s) 447-646 in 1 Group(s).
Where the effectivity is presented with hyphens between line numbers, the airplane applicability
means "through" and "inclusive", e.g. line numbers 1-9 means line numbers 1 through 9 inclusive.
DESCRIPTIONCONFIGURATIONGROUP
All MD-11 and MD-11F-1
Airplane Models:
MD-11, MD-11F
GroupFuselage Number
1447 - 449
1450 - 459
1460 - 469
1470 - 479
1480 - 489
1490 - 499
1500 - 509
GroupFuselage Number
1510 - 519
1520 - 529
1530 - 539
1540 - 549
1550 - 559
1560 - 569
1570 - 579
GroupFuselage Number
1580 - 589
1590 - 599
1600 - 609
1610 - 619
1620 - 629
1630 - 639
1640 - 646
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B. Spares Affected
None.
2. CONCURRENT REQUIREMENTS
None.
3. COMPLIANCE
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to
Requirements Bulletin MD11-53A088 RB. The Airworthiness Directive will make the compliance tasks and
times given in Requirements Bulletin MD11-53A088 RB mandatory.
Accomplish the required action(s), based on the applicable condition(s) in Table 1, in accordance with the
Accomplishment Instructions.
When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When
more than one ACTION is given for a CONDITION or an OPTION, do all of the ACTION numbers for that
CONDITION or OPTION.
Table 1: ETHF Inspection of the Overwing Floor Beams and Detailed Inspection of the Overwing Floor
Beam Supports, Left and Right Sides
Repeat Interval
(Not to Exceed,
Whichever Oc-
curs First)
Compliance Time (Whichever Occurs
Later)
ActionCondition
-Within 1,990 flight
cycles or within 27
months, after the
original issue date
of Requirements
Bulletin MD11-
53A088 RB,
whichever occurs
first.
Before 20,000 total
flight cycles.
Do a General Visual Inspec-
tion of the overwing floor
beams for any repair.
ALL AIR-
PLANES
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Table 1: ETHF Inspection of the Overwing Floor Beams and Detailed Inspection of the Overwing Floor
Beam Supports, Left and Right Sides
Repeat Interval
(Not to Exceed,
Whichever Oc-
curs First)
Compliance Time (Whichever Occurs
Later)
ActionCondition
-Before further flight.CONDITION 1 (ACTION 1):
Contact The Boeing Company
for alternative inspection(s) to
Requirements Bulletin MD11-
53A088 RB, incorporate the
inspection(s) into the mainte-
nance programs and do the
inspection(s) at the times
specified by Boeing.
CONDITION 1:
ANY REPAIR
FOUND
-Before further flight.CONDITION 1 (ACTION 2):
Do Detailed Inspections of the
overwing floor beam supports
and ETHF Inspections of the
overwing floor beams at any
unrepaired areas, for any
crack.
-Before further flight.CONDITION 1.1 (ACTION 1):
Contact The Boeing Company
for repair instructions and do
the repair.
CONDITION 1.1:
ANY CRACK
FOUND
3060 Flight Cycles
or 64 months.
-CONDITION 1.1 (ACTION 2):
Repeat Detailed Inspections
of the overwing floor beam
supports and ETHF Inspec-
tions of the overwing floor
beams at any unrepaired ar-
eas, for any crack. (a)
3060 Flight Cycles
or 64 months.
-Repeat Detailed Inspections
of the overwing floor beam
supports and ETHF Inspec-
tions of the overwing floor
beams at any unrepaired ar-
eas, for any crack. (a)
CONDITION 1.2:
NO CRACK
FOUND
-Before further flight.Do Detailed Inspections of the
overwing floor beam supports
and ETHF Inspections of the
overwing floor beams for any
crack.
CONDITION 2:
NO REPAIR
FOUND
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Table 1: ETHF Inspection of the Overwing Floor Beams and Detailed Inspection of the Overwing Floor
Beam Supports, Left and Right Sides
Repeat Interval
(Not to Exceed,
Whichever Oc-
curs First)
Compliance Time (Whichever Occurs
Later)
ActionCondition
-Before further flight.CONDITION 2.1 (ACTION 1):
Contact The Boeing Company
for repair instructions and do
the repair.
CONDITION 2.1:
ANY CRACK
FOUND
3060 Flight Cycles
or 64 months.
-CONDITION 2.1 (ACTION 2):
Repeat Detailed Inspections
of the overwing floor beam
supports and ETHF Inspec-
tions of the overwing floor
beams for any crack. (a)
3060 Flight Cycles
or 64 months.
-Repeat Detailed Inspections
of the overwing floor beam
supports and ETHF Inspec-
tions of the overwing floor
beams for any crack. (a)
CONDITION 2.2:
NO CRACK
FOUND
(a) It is not required to do the inspections in Requirements Bulletin MD11-53A088 RB in areas where a repair
covers the affected inspection zone provided that:
1. The repair is the corrective action to the crack condition identified while performing Requirements Bulletin
MD11-53A088 RB and installed after the original issue date of Requirements Bulletin MD11-53A088 RB,
AND
2. The installed repair was approved by the Boeing Organization Designation Authorization (ODA) via a
FAA Form 8100-9.
4. APPROVAL
This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changes
specified in this document comply with the applicable regulations and are FAA approved, as well as European
Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved
airplanes listed in the service bulletin effectivity. This document and its approval were based on the airplane
in its original Boeing delivery configuration or as modified by other Boeing changes.
If an airplane has a non-Boeing modification or repair that affects a component or system also affected by
this Requirements Bulletin, the operator is responsible for obtaining appropriate regulatory agency approval
before incorporating this Requirements Bulletin.
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5.    ACCOMPLISHMENT INSTRUCTIONS
A. GENERAL INFORMATION
NOTE: 1. This is an Enhanced Required for Compliance document. There w ill be a separate
Service Bulletin (SB) and a separate Requirements Bulletin (RB). If an RB is mandated
by an Airworthiness Directive (AD), then all applicable requirements specified in the
RB must be done. For the related SB, some locations are marked RC Start and RC
End to identify the requirements that are restated from the RB. For the related SB,
the areas between RC Start and RC End, including sub-steps and any figures
identified between RC Start and RC End, must be done to comply with the AD.
Therefore, an Alternative Method of Compliance (AMOC) is required for any deviations
to steps between RC Start and RC End, including substeps and identified figures.
For the related SB, the steps not between RC Start and RC End may be deviated
from using accepted methods in accordance with the operator's maintenance or
inspection program without obtaining approval of an AMOC; this is provided that the
steps between RC Start and RC End, including sub-steps and identified figures, can
still be done as specified, and the airplane can be put back in an airworthy condition.
Figures not required for compliance are omitted from the RB.
2. This is an Enhanced Required for Compliance document. The Boe ing processes
used to create the Service Bulletin (SB) and the Requirements Bulletin (RB) ensure
that the information between "RC Start" and "RC End" in the SB are identical to the
information in the same sections (Compliance, Work Instructions...) of the RB which
the SB refers to as the related document.
5. Unless shown differently, these dimensions and tolerances are  used:
– Linear dimensions are in inches
– Tolerance on linear dimensions, other than rivet and bolt edge  margins, is plus
or minus 0.03 inch.
– Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch
– Angular tolerance is plus or minus 2 degrees
– Hole dimensions for standard solid rivets are in and fasteners  are in Structural
Repair Manual (SRM) Chapter 51
– Torque Values:
— Values for structural fasteners are given in MD11 Structural Repair Manual,
Chapter 51.
— Values for airframe maintenance tasks are included in Chapter 20 of MD11
Aircraft Maintenance Manual (AMM).
— Values for electrical maintenance tasks are included in Chapte r 20 of
Standard Wiring Practices Manual (SWPM).
— Values for engine maintenance tasks are included in Chapter 70  of MD11
Aircraft Maintenance Manual (AMM).
— Non-standard torque values for maintenance tasks are included in the
applicable installation step.
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7. A Detailed Inspection is defined as: An intensive examination  of a specific item,
installation or assembly to detect damage, failure or irregularity. This could include
tactile assessment in which a component or assembly can be checked for
tightness/security. Available lighting is normally supplemented with a direct source
of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors
and magnifying lenses may be necessary. Surface cleaning and elaborate access
procedures may be required.
8. A General Visual Inspection is defined as: A visual examinati on of an interior or
exterior area, installation or assembly to detect obvious damage, failure or irregularity.
This level of inspection is made from within touching distance unless otherwise
specified. A mirror may be necessary to enhance visual access to all exposed surfaces
in the inspection area. This level of inspection is made under normally available
lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may
require removal or opening of access panels or doors. Stands, ladders or platforms
may be required to gain proximity to the area being checked.
9. These work instructions refer to procedures included in other  Boeing documents.
When the words "refer to" are used and the operator has an accepted alternative
procedure, the accepted alternative procedure can be used. When the words "in
accordance with" are included in the instruction, the procedure in the Boeing document
must be used.
10. If it is necessary to remove more parts for access, you can remove those parts. If
you can get access without removing identified parts, it is not necessary to remove
all of the identified parts. Jacking and shoring limitations must be observed.
11. When more than one OPTION is given for a CONDITION, do only one of the OPTION
numbers. When more than one ACTION is given for a CONDITION or an OPTION,
do all of the ACTION numbers for that CONDITION or OPTION.
12. The compliance times for the actions in WORK INSTRUCTIONS ar e in Compliance.
B. WORK INSTRUCTIONS
Actions Required for Compliance
1. Requirements
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Table 1: ETHF Inspection of the Overwing Floor Beams and Detailed Inspection of the Overwing Floor
Beam Supports, Left and Right Sides
Refer to the listed
procedures in SB
MD11-53A088
Original Issue or
later approved re-
visions as an ac-
cepted procedure
Method of ComplianceActionCondition
Do PART 1: GET
ACCESS
-Do a General Visual Inspec-
tion of the overwing floor
beams for any repair.
ALL AIRPLANES
-FIGURE 1
-FIGURE 2
Do PART 2:
CLOSE ACCESS
-CONDITION 1 (ACTION 1):
Contact The Boeing Compa-
ny for alternative inspec-
tion(s) to Requirements Bul-
letin MD11-53A088 RB, in-
corporate the inspection(s)
into the maintenance pro-
grams and do the inspec-
tion(s) at the times specified
by Boeing.
CONDITION 1:
ANY REPAIR FOUND
Do PART 1: GET
ACCESS
-CONDITION 1 (ACTION 2):
Do Detailed Inspections of
the overwing floor beam
supports and ETHF Inspec-
tions of the overwing floor
beams at any unrepaired ar-
eas, for any crack.
-FIGURE 3
-FIGURE 4
-FIGURE 5
-FIGURE 6
Do PART 2:
CLOSE ACCESS
-CONDITION 1.1 (ACTION
1): Contact The Boeing
Company for repair instruc-
tions and do the repair.
CONDITION 1.1: ANY
CRACK FOUND
Do PART 1: GET
ACCESS
-CONDITION 1.1 (ACTION
2): Repeat Detailed Inspec-
tions of the overwing floor
beam supports and ETHF
Inspections of the overwing
floor beams at any unre-
paired areas, for any crack.
(a)
-FIGURE 3
-FIGURE 4
-FIGURE 5
-FIGURE 6
Do PART 2:
CLOSE ACCESS
-
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Table 1: ETHF Inspection of the Overwing Floor Beams and Detailed Inspection of the Overwing Floor
Beam Supports, Left and Right Sides
Refer to the listed
procedures in SB
MD11-53A088
Original Issue or
later approved re-
visions as an ac-
cepted procedure
Method of ComplianceActionCondition
Do PART 2:
CLOSE ACCESS
-Repeat Detailed Inspections
of the overwing floor beam
supports and ETHF Inspec-
tions of the overwing floor
beams at any unrepaired ar-
eas, for any crack.
CONDITION 1.2: NO
CRACK FOUND
Do PART 1: GET
ACCESS
-
-FIGURE 3
-FIGURE 4
-FIGURE 5
-FIGURE 6
Do PART 1: GET
ACCESS
-Do Detailed Inspections of
the overwing floor beam
supports and ETHF Inspec-
tions of the overwing floor
beams for any crack.
CONDITION 2:
NO REPAIR FOUND
-FIGURE 3
-FIGURE 4
-FIGURE 5
-FIGURE 6
Do PART 2:
CLOSE ACCESS
-CONDITION 2.1 (ACTION
1): Contact The Boeing
Company for repair instruc-
tions and do the repair.
CONDITION 2.1: ANY
CRACK FOUND
Do PART 1: GET
ACCESS
-CONDITION 2.1 (ACTION
2): Repeat Detailed Inspec-
tions of the overwing floor
beam supports and ETHF
Inspections of the overwing
floor beams for any crack.
(a)
-FIGURE 3
-FIGURE 4
-FIGURE 5
-FIGURE 6
Do PART 2:
CLOSE ACCESS
-
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### Page 13

Table 1: ETHF Inspection of the Overwing Floor Beams and Detailed Inspection of the Overwing Floor
Beam Supports, Left and Right Sides
Refer to the listed
procedures in SB
MD11-53A088
Original Issue or
later approved re-
visions as an ac-
cepted procedure
Method of ComplianceActionCondition
Do PART 2:
CLOSE ACCESS
-Repeat Detailed Inspections
of the overwing floor beam
supports and ETHF Inspec-
tions of the overwing floor
beams for any crack.
CONDITION 2.2: NO
CRACK FOUND
Do PART 1: GET
ACCESS
-
-FIGURE 3
-FIGURE 4
-FIGURE 5
-FIGURE 6
(a) It is not required to do the inspections in Requirements Bul letin MD11-53A088 RB in areas where a
repair covers the affected inspection zone provided that:
1. The repair is the corrective action to the crack condition identified while performing Requirements
Bulletin MD11-53A088 RB and installed after the original issue date of Requirements Bulletin MD11-
53A088 RB,
AND
2. The installed repair was approved by the Boeing Organization Designation Authorization (ODA) via
a FAA Form 8100-9.
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### Page 14 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA
Y = 1305
STA
Y = 1256
Y=  $ 1305
STA
Y = 1293
Y=  SŤ275
STA
Y = 1256
STA
X = 90
GENERAL VISUAL INSPECTION  STA  FWD  2911527
X = 116
FIGURE 1: LEFT SIDE - GENERAL VISUAL INSPECTION OF THE OVERWING FLOOR BEAMS
(SHEET 1 OF 2)
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### Page 15

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)--FLOOR BEAMSInspect1
(a) Do a General Visual Inspection for any repair of the floor beams from STA X=90 to X=116 at STA Y=1256,
1275, 1293 and 1305.
FIGURE 1: LEFT SIDE - GENERAL VISUAL INSPECTION OF THE OVERWING FLOOR BEAMS
(SHEET 2 OF 2)
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### Page 16 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA
Y = 1305
STA
Y = 1256
STA
Y = 1305
STA
Y= 1293
STA
· = 1275
STA
Y = 1256
STA
X = 90
GENERAL VISUAL INSPECTION x57A6  FWD  2911528
FIGURE 2: RIGHT SIDE - GENERAL VISUAL INSPECTION OF THE OVERWING FLOOR BEAMS
(SHEET 1 OF 2)
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### Page 17

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)--FLOOR BEAMSInspect1
(a) Do a General Visual Inspection for any repair of the floor beams from STA X=90 to X=116 at STA Y=1256,
1275, 1293 and 1305.
FIGURE 2: RIGHT SIDE - GENERAL VISUAL INSPECTION OF THE OVERWING FLOOR BEAMS
(SHEET 2 OF 2)
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### Page 18 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA
Y = 1305
STA
Y = 1256
STA
Y = 1305
STA
Y = 1293
STA
Y = 1275
STA
Y = 1256
I, E
STA
X = 90
STA  FWD  2911529
X = 116
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 1 OF 10)
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### Page 19 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
X = 116
FLOOR BEAM
CARACAL
STA  X = 107
FLOOR SUPPORT  TYPICAL CRACK  LOOKING AFT  FLOOR BEAM  (TYPICAL)  A-A
TYPICAL  CRACK
TYPICAL  CRACK  TYPICAL  CRACK  FASTENER PATTERN MAY VARY  ETHF INSPECTION
NOTE:  2911530
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 2 OF 10)
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### Page 20 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
TYPICAL CRACK
STA  X = 107  LOOKING DOWN  FLOOR BEAM  (TYPICAL)  B-B
TYPICAL CRACK
FASTENER PATTERN MAY VARY  ETHF INSPECTION
NOTE:  2911531
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 3 OF 10)
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### Page 21 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
TYPICAL  CRACK
TYPICAL CRACK
TYPICAL  CRACK
STA  X = 107  INED
TYPICAL CRACK
TYPICAL CRACK  FASTENER PATTERN MAY VARY  ETHF INSPECTION
STA  X = 116  NOTE:  2911532
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 4 OF 10)
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### Page 22 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
TYPICAL CRACK
TYPICAL CRACK  FLOOR BEAM  INBD  LOOKING UP  FLOOR BEAM  (TYPICAL)  D-D
FRAME
FASTENER PATTERN MAY VARY  ETHF INSPECTION
NOTE:  2911533
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 5 OF 10)
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### Page 23 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
FLOOR BEAM
TYPICAL  CRACK
STA  X = 107  LF
FLOOR SUPPORT  LOOKING AFT  FLOOR BEAM  TYPICAL  E-E
TYPICAL CRACK
STA  X = 90  FASTENER PATTERN MAY VARY  ETHE INSPECTION
PROBE
NOTE:  2911534
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 6 OF 10)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  23 of 43

### Page 24 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
3 -
FWD
FLOOR BEAM
STA Y=1275 SHOWN STA Y=1293 SIMILAR
F-F
ATTACHED ANGLE
ETHF INSPECTION
FLOOR BEAM MODIFICATION
STA Y=1275 SHOWN STA Y=1293 SIMILAR  F-F  2911535
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 7 OF 10)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  24 of 43

### Page 25

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)--Floor Beam: Around
Fastener Holes
Inspect1
(b)--Floor Beam: Web and
Flange Surfaces
Inspect2
(c)--Floor Beam: Flange
Edges
Inspect3
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 8 OF 10)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: March 06, 2020
MD11-53A088 RB
25 of 43
REQUIREMENTS BULLETIN MD11-53A088
ALERTALERT

### Page 26

More DataQtyIdentificationNameTaskStep
(a) Do an ETHF inspection of the overwing floor beam web and the upper and lower flanges at each fastener
location for any crack from STA X = 90 to 116 at stations Y = 1256, 1275, 1293 and 1305 in accordance
with NDTSPM Part 06-10-01.001, Procedure 1. Inspect the beam upper flange on both surfaces. Inspect
the beam web on either face, as needed to avoid obstructions. Inspect the beam lower flange on the upper
or lower surface, as needed to avoid obstructions.
1. Calibrate instrument on the N3 notch, in accordance with Figu re 2 of the NDTSPM procedure.
2. Utilize calibration Scan Method K, in accordance with Figure 3, Sheet 2 of the NDTSPM procedure
to produce an impedance plane display similar to that shown in Figure 1 of the NDTSPM proce-
dure.
3. To inspect, use Scan Method 44, in accordance with Figure 4, Sheets 1 and 2, of the NDTSPM
procedure.
4. Scan around all fastener holes on the web and flange surfaces  of the four floor beams, as noted
above. Structure attached to the floor beams does not have to be detached from the floor beams.
– From STA X = 90 to 116 at stations Y = 1256, 1275, 1293 and 13 05.
(b) Do an ETHF inspection of the flat surfaces of the floor beam flanges and webs for any crack from STA X
= 90 to 116 at stations Y = 1256, 1275, 1293 and 1305 in accordance with NDTSPM Part 06-10-01.001,
Procedure 1.
1. Calibrate instrument on the N5 notch, in accordance with Figu re 2 of the NDTSPM procedure.
2. Utilize calibration Scan Method F, in accordance with Figure 3, Sheet 1 of the NDTSPM procedure
to produce an impedance plane display similar to that shown in Figure 1 of the NDTSPM proce-
dure.
3. To inspect, use Scan Method 61, in accordance with Figure 6, Sheets 1 and 2, of the NDTSPM
procedure.
4. Scan all web and flange surfaces of the four floor beams. Str ucture attached to the floor beams
does not have to be detached from the floor beams.
– From STA X = 90 to 116 at stations Y = 1256, 1275, 1293 and 13 05.
– Scan between fastener rows, and between holes and edges. Where no fasteners exist, scan
incrementally, approximately 1/4 inch apart.
– Scan angles which compose the floor beam (not repair angles).
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 9 OF 10)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: March 06, 2020
MD11-53A088 RB
26 of 43
REQUIREMENTS BULLETIN MD11-53A088
ALERTALERT

### Page 27

More DataQtyIdentificationNameTaskStep
(c) Do an ETHF inspection of the floor beam flange edges for any  crack from STA X = 90 to 116 at stations
Y = 1256, 1275, 1293 and 1305 in accordance with NDTSPM Part 06-10-01.001, Procedure 1.
1. Calibrate instrument using the N5 notch, in accordance with F igure 2 of the NDTSPM procedure.
2. Utilize Scan Method J, in accordance with Figure 3, Sheet 1 o f the NDTSPM procedure to produce
an impedance plane display similar to that shown in Figure 1 of the NDTSPM procedure.
3. To inspect, use Scan Method 71 in accordance with Figure 7, S heets 1 and 2 of the NDTSPM
procedure.
4. Scan along all edges of the four floor beams (and attached an gle, if present). Structure attached
to the floor beams does not have to be detached from the floor beams.
– From STA X = 90 to 116 at stations Y = 1256, 1275, 1293 and 13 05.
FIGURE 3: LEFT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 10 OF 10)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: March 06, 2020
MD11-53A088 RB
27 of 43
REQUIREMENTS BULLETIN MD11-53A088
ALERTALERT

### Page 28 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA
Y = 1305
STA
Y = 1256
STA
Y = 1305
STA
·= 1293
STA
·= 1275
A, E  , Y = 1256  STA
STA
X = 90
FWD  2911537
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 1 OF 10)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  28 of 43

### Page 29 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA  X = 90
TYPICAL CRACK
TYPICAL CRACK
FLOOR SUPPORT  TYPICAL CRACK
LOOKING AFT  FLOOR BEAM  (TYPICAL)  A-A
× =707
TYPICAL CRACK
FLOOR BEAM  FASTENER PATTERN MAY VARY  ETHF INSPECTION
NOTE:  2911539
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 2 OF 10)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  29 of 43

### Page 30 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
TYPICAL CRACK
LOOKING DOWN  FLOOR BEAM  (TYPICAL)  B-B
STA  X = 107
TYPICAL CRACK  FASTENER PATTERN MAY VARY  ETHF INSPECTION
NOTE:  2911540
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 3 OF 10)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  30 of 43

### Page 31 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA  X = 116
TYPICAL CRACK
STA  X = 107
TYPICAL  CRACK
FASTENER PATTERN MAY VARY  ETHF INSPECTION
NOTE:  2911541
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 4 OF 10)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  31 of 43

### Page 32 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
INBD
TYPICAL CRACK  FLOOR BEAM  LOOKING UP  FLOOR BEAM  (TYPICAL)  D-D
TYPICAL CRACK
FASTENER PATTERN MAY VARY  ETHF INSPECTION
NOTE:  2911542
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 5 OF 10)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  32 of 43

### Page 33 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
TYPICAL  CRACK
FLOOR SUPPORT  TYPICAL  CRACK  LOOKING AFT  FLOOR BEAM  TYPICAL  E-E
STA  X = 107
TYPICAL  CRACK
FLOOR BEAM  FASTENER PATTERN MAY VARY  ETHF INSPECTION
NOTE:  2911543
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 6 OF 10)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  33 of 43

### Page 34 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
FWD
FLOOR BEAM
STA Y=1275 SHOWN STA Y=1293 SIMILAR
F-F
ATTACHED ANGLE
FWD
1 3
ETHF INSPECTION
FLOOR BEAM MODIFICATION
STA Y=1275 SHOWN STA Y=1293 SIMILAF  2911544
F-F
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 7 OF 10)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  34 of 43

### Page 35

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)--Floor Beam: Around
Fastener Holes
Inspect1
(b)--Floor Beam: Web and
Flange Surfaces
Inspect2
(c)--Floor Beam: Flange
Edges
Inspect3
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 8 OF 10)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: March 06, 2020
MD11-53A088 RB
35 of 43
REQUIREMENTS BULLETIN MD11-53A088
ALERTALERT

### Page 36

More DataQtyIdentificationNameTaskStep
(a) Do an ETHF inspection of the overwing floor beam web and the upper and lower flanges at each fastener
location for any crack from STA X = 90 to 116 at stations Y = 1256, 1275, 1293 and 1305 in accordance
with NDTSPM Part 06-10-01.001, Procedure 1. Inspect the beam upper flange on both surfaces. Inspect
the beam web on either face, as needed to avoid obstructions. Inspect the beam lower flange on the upper
or lower surface, as needed to avoid obstructions.
1. Calibrate instrument on the N3 notch, in accordance with Figu re 2 of the NDTSPM procedure.
2. Utilize calibration Scan Method K, in accordance with Figure 3, Sheet 2 of the NDTSPM procedure
to produce an impedance plane display similar to that shown in Figure 1 of the NDTSPM proce-
dure.
3. To inspect, use Scan Method 44, in accordance with Figure 4, Sheets 1 and 2, of the NDTSPM
procedure.
4. Scan around all fastener holes on the web and flange surfaces  of the four floor beams, as noted
above. Structure attached to the floor beams does not have to be detached from the floor beams.
– From STA X = 90 to 116 at stations Y = 1256, 1275, 1293 and 13 05.
(b) Do an ETHF inspection of the flat surfaces of the floor beam flanges and webs for any crack from STA X
= 90 to 116 at stations Y = 1256, 1275, 1293 and 1305 in accordance with NDTSPM Part 06-10-01.001,
Procedure 1.
1. Calibrate instrument on the N5 notch, in accordance with Figu re 2 of the NDTSPM procedure.
2. Utilize calibration Scan Method F, in accordance with Figure 3, Sheet 1 of the NDTSPM procedure
to produce an impedance plane display similar to that shown in Figure 1 of the NDTSPM proce-
dure.
3. To inspect, use Scan Method 61, in accordance with Figure 6, Sheet 1 and 2, of the NDTSPM
procedure.
4. Scan all web and flange surfaces of the four floor beams. Str ucture attached to the floor beams
does not have to be detached from the floor beams.
– From STA X = 90 to 116 at stations Y = 1256, 1275, 1293 and 13 05.
– Scan between fastener rows, and between holes and edges. Where no fasteners exist, scan
incrementally, approximately 1/4 inch apart.
– Scan angles which compose the floor beam (not repair angles).
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 9 OF 10)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: March 06, 2020
MD11-53A088 RB
36 of 43
REQUIREMENTS BULLETIN MD11-53A088
ALERTALERT

### Page 37

More DataQtyIdentificationNameTaskStep
(c) Do an ETHF inspection of the floor beam flange edges for any  crack from STA X = 90 to 116 at stations
Y = 1256, 1275, 1293 and 1305 in accordance with NDTSPM Part 06-10-01.001, Procedure 1.
1. Calibrate instrument using the N5 notch, in accordance with F igure 2 of the NDTSPM procedure.
2. Utilize Scan Method J, in accordance with Figure 3, Sheet 1 o f the NDTSPM procedure to produce
an impedance plane display similar to that shown in Figure 1 of the NDTSPM procedure.
3. To inspect, use Scan Method 71 in accordance with Figure 7, S heets 1 and 2 of the NDTSPM
procedure.
4. Scan along all edges of the four floor beams (and attached an gle, if present). Structure attached
to the floor beams does not have to be detached from the floor beams.
– From STA X = 90 to 116 at stations Y = 1256, 1275, 1293 and 13 05.
FIGURE 4: RIGHT SIDE - EDDY CURRENT HIGH FREQUENCY (ETHF) INSPECTION OF THE OVERWING
FLOOR BEAMS
(SHEET 10 OF 10)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: March 06, 2020
MD11-53A088 RB
37 of 43
REQUIREMENTS BULLETIN MD11-53A088
ALERTALERT

### Page 38 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA
Y = 1305
STA
Y = 1256
STA  STA  STA  STA  STA  STA
Y = 1231  Y = 1256  Y = 1275  Y = 1293 Y = 1305  Y = 1321
STA X=81
A -
2911546
FIGURE 5: LEFT SIDE - DETAILED INSPECTION OF OVERWING FLOOR BEAM SUPPORTS
(SHEET 1 OF 3)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991
Work - See page 1 for details.  Copyright © Unpublished  38 of 43

### Page 39 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA  STA
X = 81  X = 107
STA
Y = 1305 SHOWN
Y = 1256
Y = 1275
Y = 1293
SIMILAR
- B
LOOKING FORWARD
FLOOR BEAM SUPPORT
Y = 1305 SHOWN
Y = 1256, Y = 1275 AND Y = 1293 SIMILAR
A-A
TYPICAL
B-B
DETAILED INSPECTION  2911547
FIGURE 5: LEFT SIDE - DETAILED INSPECTION OF OVERWING FLOOR BEAM SUPPORTS
(SHEET 2 OF 3)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  Copyright © Unpublished  MD11-53A088 RB
Work - See page 1 for details.  39 of 43

### Page 40

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)--Floor Beam Support:
Rods and Rod Ends
Inspect1
(a) Do a Detailed Inspection of the floor beam support rods, rods ends and attached pieces, for any crack or
failed supports for STA X=81 at STA Y=1256, 1275, 1293 and 1305.
FIGURE 5: LEFT SIDE - DETAILED INSPECTION OF OVERWING FLOOR BEAM SUPPORTS
(SHEET 3 OF 3)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: March 06, 2020
MD11-53A088 RB
40 of 43
REQUIREMENTS BULLETIN MD11-53A088
ALERTALERT

### Page 41 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA
Y = 1305
STA
Y = 1256
STA  STA  STA  STA  STA  STA
Y = 1231  Y = 1256  Y = 1275  Y = 1293 Y = 1305  Y = 1321
A
STA X=81
2911548
FIGURE 6: RIGHT SIDE - DETAILED INSPECTION OF OVERWING FLOOR BEAM SUPPORTS
(SHEET 1 OF 3)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Copyright © Unpublished
Work - See page 1 for details.  41 of 43

### Page 42 (OCR)

REQUIREMENTS BULLETIN MD11-53A088
ALERT  ALERT
STA  STA
X = 107  X = 81
VIS
MONS 9001 = 1
Y = 1275
Y = 1293
LOOKING FORWARD
FLOOR BEAM SUPPORT
Y = 1305 SHOWN
Y = 1256, Y = 1275 AND Y = 1293 SIMILAR
A-A
TYPICAL
B-B
DETAILED INSPECTION  2911549
FIGURE 6: RIGHT SIDE - DETAILED INSPECTION OF OVERWING FLOOR BEAM SUPPORTS
(SHEET 2 OF 3)
Original Issue: March 06, 2020
Export Controlled ECCN: 9E991  MD11-53A088 RB
Work - See page 1 for details.  Copyright © Unpublished  42 of 43

### Page 43

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)--Floor Beam Support:
Rods and Rod Ends
Inspect1
(a) Do a Detailed Inspection of the floor beam support rods, rods ends and attached pieces, for any crack or
failed supports for STA X=81 at STA Y=1256, 1275, 1293 and 1305.
FIGURE 6: RIGHT SIDE - DETAILED INSPECTION OF OVERWING FLOOR BEAM SUPPORTS
(SHEET 3 OF 3)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: March 06, 2020
MD11-53A088 RB
43 of 43
REQUIREMENTS BULLETIN MD11-53A088
ALERTALERT

---
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