# Boeing Alert Requirements Bulletin 727-57A0188 RB: No revision named

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- Title as filed: 727-57A0188-00 RB
- Pages: 20
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### Page 1

Commercial 
Airplanes
727
Requirements Bulletin
ALERT
Number: 727-57A0188 RB
Original Issue: May 31, 2018
ATA System: 5752 2751
SUBJECT: WINGS - Trailing Edge Flaps - Outboard Flap Tracks Inspection at Flap Track Positions
1, 2, 7, and 8
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 © 2018 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Unpublished Work.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
Boeing liveries are all trademarks owned by The Boeing Company; and no trademark license is granted in
connection with this document unless provided in writing by Boeing.
Original Issue: May 31, 2018
727-57A0188 RB
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2.0

### Page 2

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REQUIREMENTS BULLETIN 727-57A0188
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### Page 3

Table of Contents
1. EFFECTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
A. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
B. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. CONCURRENT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
B. Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
FIGURE 1: FLAP TRACK POSITION 1, 2, 7, AND 8 - SURFACE HFEC INSPECTION . . . . . . . . 13
FIGURE 2: LEFT WING - FLAP TRACK AND REAR SPAR ATTACHMENT - DETAILED INSPECTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
FIGURE 3: RIGHT WING - FLAP TRACK AND REAR SPAR ATTACHMENT - DETAILED INSPECTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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Commercial 
Airplanes
727
Requirements Bulletin
ALERT
Number: 727-57A0188 RB
Original Issue: May 31, 2018
ATA System: 5752 2751
SUBJECT: WINGS - Trailing Edge Flaps - Outboard Flap Tracks Inspection at Flap Track Positions
1, 2, 7, and 8
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 727, 727-100, 727-100C, 727-200, 727-200F, and 727C Airplanes, line
numbers 1 thru 1832 in 1 Group.
B. Spares Affected
Examine your spares supply for the parts or components identified below. If any parts or components
are found, refer to Paragraph 5.B., WORK INSTRUCTIONS of Requirements Bulletin 727-57A0188
RB for the recommended action.
Flap Track PositionPart Number
1 / 2 / 7 / 865-19250-2
1 / 2 / 7 / 865-19250-3
1 / 2 / 7 / 865-19250-4
1 / 2 / 7 / 865-19250-5
1 / 2 / 7 / 865-19250-6
1 / 2 / 7 / 865-19250-7
1 / 2 / 7 / 865-19250-8
1 / 2 / 7 / 865-19250-9
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2. CONCURRENT REQUIREMENTS
None.
3. COMPLIANCE
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to
Requirements Bulletin 727-57A0188 RB. The Airworthiness Directive will make the compliance tasks and
times given in Requirements Bulletin 727-57A0188 RB mandatory.
Accomplish the required action(s), based on the applicable conditions 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 number or an OPTION number, do all of the ACTION
numbers for that CONDITION number or OPTION number.
The actions required for each INSPECTION in Table 1 are identified as follows:
ActionTitle
Do a surface High Frequency Eddy Current (HFEC) Inspection of the flap
track flanges and webs for any crack.
INSPECTION 1
Do a detailed inspection of the flap track interface with the rear spar at-
tachment with the flap track for any discrepancy. A discrepancy is defined
as any loose fastener, corrosion, damaged or missing anti-fret strip, or
damaged or missing shim.
INSPECTION 2
Table 1: Detailed Inspection and Surface HFEC Inspection of the Outboard Flap Tracks at Positions 1,
2, 7, and 8
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 120 days
after the original
issue date of
Requirements
Bulletin 727-
57A0188 RB.
Within 500 flap
track flight cy-
cles or 1 year,
whichever oc-
curs first, after
the most recent
overhaul of the
affected flap
track.
ACTION 1: Do INSPEC-
TION 1 at each affected
flap track.
Airplanes with flap tracks
that have known mainte-
nance records and on
which an overhaul was
done. -ACTION 2: Do INSPEC-TION 2 at each affected
flap track.
-Within 120 days
after the original
issue date of
Requirements
Bulletin 727-
57A0188 RB.
Within 2,000
flap track flight
cycles or 4
years, whichev-
er occurs first,
since the affect-
ed flap track
was new.
ACTION 1: Do INSPEC-
TION 1 at each affected
flap track.
Airplanes with flap tracks
that have known mainte-
nance records and on
which no overhaul was
done. ACTION 2: Do INSPEC-TION 2 at each affected
flap track.
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Table 1: Detailed Inspection and Surface HFEC Inspection of the Outboard Flap Tracks at Positions 1,
2, 7, and 8
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 120 days after the original
issue date of Requirements Bul-
letin 727-57A0188 RB.
ACTION 1: Do INSPEC-
TION 1 at each affected
flap track.
Airplanes with flap tracks
that have unknown mainte-
nance records.
Within 120 days after the original
issue date of Requirements Bul-
letin 727-57A0188 RB.
ACTION 2: Do INSPEC-
TION 2 at each affected
flap track.
500 flight cycles or
1 year, whichever
occurs first.
-Repeat INSPECTION 1
at each affected flap
track.
CONDITION 1.1: NO
CRACK FOUND DURING
INSPECTION 1 (a)
-Before further flight.OPTION 1 (ACTION 1):
Contact the Boeing Com-
pany for repair instruc-
tions and do the repair at
each affected flap track.
CONDITION 1.2: ANY
CRACK FOUND DURING
INSPECTION 1 (a)
500 flight cycles or
1 year, whichever
occurs first.
-OPTION 1 (ACTION 2):
Repeat INSPECTION 1
in the unrepaired area of
each affected flap track.
-Before further flightOPTION 2: Remove the
flap track and install a
new or serviceable flap
track (b)
500 flight cycles or
1 year, whichever
occurs first.
-Repeat INSPECTION 2
of each affected flap
track.
CONDITION 2.1: NO DIS-
CREPANCY FOUND
DURING INSPECTION 2
(a)
-Before further flight.OPTION 1 (ACTION 1):
Contact the Boeing Com-
pany for repair instruc-
tions and do the repair at
each affected flap track.
CONDITION 2.2: ANY
DISCREPANCY FOUND
DURING INSPECTION 2
(a)
500 flight cycles or
1 year, whichever
occurs first.
-OPTION 1 (ACTION 2):
Repeat INSPECTION 2
in the unrepaired area of
each affected flap track.
-Before further flight.OPTION 2: Remove the
flap track and install a
new or serviceable flap
track.(b)
(a) More than one CONDITION can be applicable on each flap track.
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Table 1: Detailed Inspection and Surface HFEC Inspection of the Outboard Flap Tracks at Positions 1,
2, 7, and 8
Repeat Interval
(Not to Exceed)
Compliance Time (Whichever
Occurs Later)
ActionCondition
(b) The replacement flap track, whether new or serviceable or repaired, must be in compliance with the initial
inspection requirements and compliance times based on the applicable flap track condition. Inspections
previously accomplished in accordance with Requirements Bulletin 727-57A0188 RB can be used to
satisfy these requirements, so long as the track continues to comply with repeat intervals specified in the
table. Comply with all requirements specified in the table for the flap track installed.
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: 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 and fasteners are in Structural Repair
Manual (SRM) Chapter 51
– Torque Values:
— Values for structural fasteners are given in 727 Structural Repair Manual,
Chapter 51.
— Values for airframe maintenance tasks are included in Chapter 20 of 727
Aircraft Maintenance Manual (AMM).
— Values for electrical maintenance tasks are included in Chapter 20 of
Standard Wiring Practices Manual (SWPM).
— Values for engine maintenance tasks are included in Chapter 70 of 727
Aircraft Maintenance Manual (AMM).
— Non-standard torque values for maintenance tasks are included in the
applicable installation step.
6. Use the approved fastener, process and material substitutions in accordance with
SRM Chapter 51.
7. A Detailed Inspection is defined as: An intensive examination of a specific item,
installation, or assembly to detect damage, failure, or irregularity. Available lighting
is normally supplemented with a direct source of good lighting at an intensity deemed
appropriate. Inspection aids such as mirrors, magnifying lenses, etc. may be
necessary. Surface cleaning and elaborate procedures may be required.
8. 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.
9. Boeing Service Letter 727-SL-51-041, Damage Reporting and Repair Plan/Design
Guidelines, is an acceptable procedure to request information from Boeing for
additional structural repair instructions. The Service Letter describes what information
must be provided to Boeing before a structural repair can be provided.
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. Where the work instructions include installation of a kept part, a new or serviceable
part with the same part number can be installed as an alternative to the kept part.
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12. 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 number or an
OPTION number, do all of the ACTION numbers for that CONDITION number or
OPTION number.
13. This is an Enhanced Required for Compliance document. There will 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.
14. 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.
B. WORK INSTRUCTIONS
Actions Required for Compliance:
1. Requirements
The actions required for each INSPECTION in Table 1 are identified as follows:
ActionTitle
Do a High Frequency Eddy Current (HFEC) Inspection of the flap track
flanges and webs for any crack.
INSPECTION 1
Do a detailed inspection of the flap track interface with the rear spar at-
tachment with the flap track for any discrepancy. A discrepancy is defined
as any loose fastener, corrosion, damaged or missing anti-fret strip, or
damaged or missing shim.
INSPECTION 2
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Table 1: Detailed Inspection and Surface HFEC Inspection of the Outboard Flap Tracks at Positions 1,
2, 7, and 8
Refer to the listed
procedures in SB
727-57A0188
Original Issue or
later approved re-
visions as an ac-
cepted proce-
dure.
Method of ComplianceActionCondition
PART 1: OPEN
ACCESS
-ACTION 1: Do INSPEC-
TION 1 at each affected
flap track.
Airplanes with flap tracks
that have known mainte-
nance records and on
which an overhaul was
done.
-FIGURE 1
PART 1: OPEN
ACCESS
-ACTION 2: Do INSPEC-
TION 2 at each affected
flap track. -FIGURE 2, FIGURE 3
PART 1: OPEN
ACCESS
-ACTION 1: Do INSPEC-
TION 1 at each affected
flap track.
Airplanes with flap tracks
that have known mainte-
nance records and on
which no overhaul was
done.
-FIGURE 1
PART 1: OPEN
ACCESS
-ACTION 2: Do INSPEC-
TION 2 at each affected
flap track. -FIGURE 2, FIGURE 3
PART 1: OPEN
ACCESS
-ACTION 1: Do INSPEC-
TION 1 at each affected
flap track.
Airplanes with flap tracks
that have unknown mainte-
nance records. -FIGURE 1
PART 1: OPEN
ACCESS
-ACTION 2: Do INSPEC-
TION 2 at each affected
flap track. FIGURE 2, FIGURE 3
-FIGURE 1Repeat INSPECTION 1
at each affected flap
track.
CONDITION 1.1: NO
CRACK FOUND DURING
INSPECTION 1 (a) PART 2: CLOSEACCESS-
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Table 1: Detailed Inspection and Surface HFEC Inspection of the Outboard Flap Tracks at Positions 1,
2, 7, and 8
Refer to the listed
procedures in SB
727-57A0188
Original Issue or
later approved re-
visions as an ac-
cepted proce-
dure.
Method of ComplianceActionCondition
--OPTION 1 (ACTION 1):
Contact the Boeing Com-
pany for repair instruc-
tions and do the repair at
each affected flap track.
CONDITION 1.2: ANY
CRACK FOUND DURING
INSPECTION 1 (a)
-FIGURE 1OPTION 1 (ACTION 2):
Repeat INSPECTION 1
in the unrepaired area of
each affected flap track
PART 2: CLOSE
ACCESS
-
727 AMM 27-51-11-OPTION 2: Remove the
flap track and install a
new or serviceable flap
track (b)
PART 2: CLOSE
ACCESS
-
-FIGURE 2, FIGURE 3Repeat INSPECTION 2
of each affected flap
track.
CONDITION 2.1: NO DIS-
CREPANCY FOUND
DURING INSPECTION 2
(a)
PART 2: CLOSE
ACCESS
-
--OPTION 1 (ACTION 1):
Contact the Boeing Com-
pany for repair instruc-
tions and do the repair at
each affected flap track.
CONDITION 2.2: ANY
DISCREPANCY FOUND
DURING INSPECTION 2
(a)
-FIGURE 2, FIGURE 3OPTION 1 (ACTION 2):
Repeat INSPECTION 2
in the unrepaired area of
each affected flap track.
PART 2: CLOSE
ACCESS
-
727 AMM 27-51-11-OPTION 2: Remove the
flap track and install a
new or serviceable flap
track.(b)
PART 2: CLOSE
ACCESS
-
(a) More than one CONDITION can be applicable on each flap track.
(b) The replacement flap track, whether new or serviceable or repaired, must be in compliance with the initial
inspection requirements and compliance times based on the applicable flap track condition. Inspections
previously accomplished in accordance with Requirements Bulletin 727-57A0188 RB can be used to
satisfy these requirements, so long as the track continues to comply with repeat intervals specified in the
table. Comply with all requirements specified in the table for the flap track installed.
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### Page 13 (OCR)

REQUIREMENTS BULLETIN 727-57A0188
ALERT  ALERT
FLAP TRACK POSITION
FLAP TRACK POSITION 2. 7. AND 8 IDENTICAL
A
2811919
FIGURE 1: FLAP TRACK POSITION 1, 2, 7, AND 8 - SURFACE HFEC INSPECTION
(SHEET 1 OF 4)
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### Page 14 (OCR)

REQUIREMENTS BULLETIN 727-57A0188
ALERT  ALERT
†‡‡·
FWD
A-A
FWD
B-B
SURFACE HFEC INSPECTION  2811940
FIGURE 1: FLAP TRACK POSITION 1, 2, 7, AND 8 - SURFACE HFEC INSPECTION
(SHEET 2 OF 4)
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### Page 15 (OCR)

REQUIREMENTS BULLETIN 727-57A0188
ALERT  ALERT
FWD
C-C
FWD
D-D
SURFACE HFEC INSPECTION  2811941
FIGURE 1: FLAP TRACK POSITION 1, 2, 7, AND 8 - SURFACE HFEC INSPECTION
(SHEET 3 OF 4)
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### Page 16

The step numbers shown below agree with the numbers shown in the circle symbols in the figure.
More DataQtyIdentificationNameTaskStep
(a)--EDGES OF FLAP
TRACK FLANGES
Inspect1
(b)--FLAP TRACK WEBSInspect2
(a) Do a surface High Frequency Eddy Current (HFEC) inspection of the edges of the flap track flanges for
any crack in accordance with 727 NDT Manual Part 6, 57-53-03.
(b) Do a surface HFEC inspection of the flap track webs around each fastener for any crack in accordance
with 727 NDT Manual Part 6, 57-53-03.
FIGURE 1: FLAP TRACK POSITION 1, 2, 7, AND 8 - SURFACE HFEC INSPECTION
(SHEET 4 OF 4)
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### Page 17 (OCR)

REQUIREMENTS BULLETIN 727-57A0188
ALERT  ALERT
REAR SPAR
SUPPORT
FITTING
LAP TRACK POSITION
FLAP TRACK POSITION 2 IDENTICAL
2811994
FIGURE 2: LEFT WING - FLAP TRACK AND REAR SPAR ATTACHMENT - DETAILED INSPECTION
(SHEET 1 OF 2)
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### Page 18

The step numbers shown below agree with the numbers shown in the circle symbols in the figure.
More DataQtyIdentificationNameTaskStep
(a)--REAR SPAR ATTACH-
MENT
Inspect1
(b)--BOLTSInspect2
(a) Do a detailed inspection for any corrosion, damaged or missing anti-fret strip, or damaged or missing
shim.
(b) Do a detailed inspection for any loose fastener.
FIGURE 2: LEFT WING - FLAP TRACK AND REAR SPAR ATTACHMENT - DETAILED INSPECTION
(SHEET 2 OF 2)
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REQUIREMENTS BULLETIN 727-57A0188
ALERT  ALERT
REAR SPAR
SUPPORT
FITTING
...2230
LAP TRACK POSITION
FLAP TRACK POSITION 7 IDENTICAL
2812003
FIGURE 3: RIGHT WING - FLAP TRACK AND REAR SPAR ATTACHMENT - DETAILED INSPECTION
(SHEET 1 OF 2)
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### Page 20

The step numbers shown below agree with the numbers shown in the circle symbols in the figure.
More DataQtyIdentificationNameTaskStep
(a)--REAR SPAR ATTACH-
MENT
Inspect1
(b)--BOLTSInspect2
(a) Do a detailed inspection for any corrosion, damaged or missing anti-fret strip, or damaged or missing
shim.
(b) Do a detailed inspection for any loose fastener.
FIGURE 3: RIGHT WING - FLAP TRACK AND REAR SPAR ATTACHMENT - DETAILED INSPECTION
(SHEET 2 OF 2)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: May 31, 2018
727-57A0188 RB
20 of 20
REQUIREMENTS BULLETIN 727-57A0188
ALERTALERT

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