# Gulfstream Customer Bulletin 228: Revision B - Rights: © Gulfstream Aerospace Corporation. Filed by the FAA in regulations.gov docket FAA-2021-0958; AD 2022-16-04 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Gulfstream Customer Bulletin 228](https://openairdocs.org/service-documents/gulfstream/cb-228.md) - Title as filed: Gulfstream GV Customer Bulletin 228 RevB - Pages: 36 - PDF: https://openairdocs.org/files/sha256/e3/a9/e3a924f47d540e989f823a51e220fb6bee7da0de1f762fd6e59320b4a1491ac0 - Page: https://openairdocs.org/service-documents/gulfstream/cb-228/file/e3a924f47d54 ## 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 (No text on this page.) ### Page 2 (No text on this page.) ### Page 3 (No text on this page.) ### Page 4 (No text on this page.) ### Page 5 (No text on this page.) ### Page 6 (No text on this page.) ### Page 7 (No text on this page.) ### Page 8 (No text on this page.) ### Page 9 (No text on this page.) ### Page 10 (No text on this page.) ### Page 11 (No text on this page.) ### Page 12 (No text on this page.) ### Page 13 (No text on this page.) ### Page 14 (OCR) FOKKER AEROSTRUCTURES Title : Fokker Service Bulletin GV/GV-SP Horizontal Industrieweg 4 Stabilizer Lower Skin Inspection for Bond Line 3351 LB Papendrecht Corrosion P.O. Box 1 Controlled : Gulfstream Aerospace 3350 AA Papendrecht The Netherlands Copy Dave Snowden (GAC) Project Lead Casper Mann (FK) Quality Dept. Issue date : 07-29-2019 Andries Buitenhuis (FK) Chief Engineer Issue number : G Jack Hoogkamer (FK) MRB Engineering Report number : RP-DGUP-18-08.1658 Rogier Luijckx (FK) Program Mngr. Order number : GAG01SU001100 Security class : UNCLASSIFIED Company / dept. : F/DGUP REPORT This Service Bulletin describes the Non-Destructive Testing (NDT) inspections of the GV/GV-SP horizontal stabilizer lower skin assemblies (1159CS52003-401/-402/-403/-404). These horizontal stabilizer lower skin assemblies are designed and manufactured using the Redux 775 Metalbond system, fully identical to the Fokker 70/100 aircraft horizontal stabilizer lower skin assemblies with respect to materials, pre-treatments and processes. During current zonal inspections, stringers and doublers were found to contain Bond Line Corrosion (BLC) on several in-service aircraft. The operational fleet of Fokker 70/100 aircraft did not show any of the discovered BLC on their horizontal stabilizer lower skin assemblies. This Service Bulletin (SB) contains three parts to inspect the horizontal stabilizer lower skin assemblies for BLC using NDT inspection methods: Part I is an optional inspection using NDT methods to inspect the critical areas only, of the horizontal stabilizer bonded lower skin assemblies, to evaluate the fleet for bond line corrosion in a timely manner. If the detected damage is within the Part I Allowable Damage Limits (ADL), the aircraft must return to service with a recurring 12 month Time Limited Treatment for Corrosion Management (not to exceed 60 months from the release date of this Part Il is a mandatory inspection using NDT methods to inspect all bonded areas of the horizontal stabilizer bonded lower skin assemblies. To terminate this Service Bulletin, aircraft must complete the Part Il inspection and repair all detected damage with FAA approved permanent repairs prior to further flight. Part III is for aircraft that complete the Part Il inspection and have damage that is within the Part II ADL. If the detected damage is within the Part II ADL, the aircraft must return to service with a 48 month Time Limited Treatment for Corrosion Management. Continued on next page Prepared / Department: Checked / Department: A.J. van der Linden / DGUP A.B. Bakker / DGUP Approvals others: Approved / Department: A.Buitenhuis / ADGT ABurenus S.J. Koole / ADGU Original Issue date: September 17th, 2018 FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies kker temp 0572 10-10 page 1 of 23 - ### Page 15 (OCR) FOKKER AEROSTRUCTURES The NDT inspections specified herein are developed, tested and validated, on several in-service a/c, by Gulfstream. This Service Bulletin does not cancel any repetitive inspection. The safety intent of this Service Bulletin is to detect and address bond line corrosion on the horizontal stabilizer LH and RH lower bonded skin assembly. If not corrected, bond line corrosion of the bonded lower skin assemblies could reach a level that compromises the aircraft's airworthiness. Issue B is written to incorporate comments by the FAA and Gulfstream Aerospace Company (GAC) on issue A. Each revised sentencelpicture is indicated by a thick black line on the LH side of the page. Issue C is written to incorporate comments by the FAA and Gulfstream Aerospace Company (GAC) on issue B. Figure 2 - 10 are enlarged and pages changed to landscape lay-out for more clarity. Each revised Figurel sentence\picture is indicated by a thick black line on the LH side of the page. Issue D is written to incorporate a comment by the FAA and Gulfstream Aerospace Company (GAC) on issue C to remove the reference to the GV-SP NDT Manual, since this specific GV-SP NDT Manual does not exist and is covered by the GV NDT Manual. Only the References on Page 4 are changed. All revised text is indicated by a thick black line on the LH side of the page. Issue E is written to change Part I and to add Part II ADL and Part III Time Limited Repair. All revised text is indicated by a thick black line on the LH side of the page. Issue F is written to incorporate comments by the FAA and Gulfstream Aerospace Company (GAC) on Issue E. Each revised sentencelpicture is indicated by a thick black line on the LH side of the page. Issue G is written to simplify compliance processes. GAC internal repair processes were removed. Time Limited Repair was changed to Time Limited Treatment. Issue Date Affected Change reasons/originators prepared checked approved pages 09-17-2018 13 First issue J. Hoogkamer A.B. Bakker T. van Vugt 10-03-2018 12 Comments FAA and GAC incorporated J. Hoogkamer A.B. Bakker T. van Vugt 10-30-2018 16 Comments FAA and GAC incorporated J. Hoogkamer A.B. Bakker S.J. Koole 12-19-2018 16 Comments FAA and GAC incorporated J. Hoogkamer T. van Vugt S.J. Koole Part I changed, 04-15-2019 21 Part II ADL added and J. Hoogkamer T. van Vugt S.J. Koole Part Ill Time Limited Repair added Removed the term "disbond", Removed color from layout, improved compliance verbiage, F 05-17-2019 19 updated references, J. Hoogkamer A.B. Bakker T. van Vugt improved Part II ADL Figures and addressed inconsistencies between Figure 5 and Section 6. Issue date Issue number G July 29^, 2019 security class Report number FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies UNCLASSIFIED RP-DGUP-18-08.1658 fokker temp 0572 10-10 page 2 of 23 - ### Page 16 (OCR) FOKKER AEROSTRUCTURES Issue Date Affected pages Change reasons/originators prepared checked approyed GAC internal repair processes removed, clarified Part I instructions, G 07-29-2019 9 added Figure 6. A.J. van der Linden A.B. Bakker S.J. Koole Time Limited Repair changed to Time Limited Treatment Issue date Issue number July 291, 2019 G security class Report number UNCLASSIFIED RP-DGUP-18-08.1658 FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies Fokker temp 0572 10-10 page 3 of 23 - ### Page 17 (OCR) FOKKER AEROSTRUCTURES CONTENTS REFERENCES 5 EFFECTIVITY .. COMPLIANCE TIME: 5 MATERIALS AND TOOLS.. INSPECTIOR QUALIFICATION REQUIREMENTS.. INSPECTION Issue date Issue number July 29h, 2019 G security class Report number UNCLASSIFIED RP-DGUP-18-08.1658 FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies tokker temp 0572 10-10 page 4 of 23 - ### Page 18 (No text on this page.) ### Page 19 (No text on this page.) ### Page 20 (OCR) FOKKER AEROSTRUCTURES CLOSURE BEAM REAR BEAM - STGR 15 STGR 18 STGR 19 STGR 20 STGR 21 STGR 22 STGR 23 STGR 24 STGR 25 STGR 26 FRONT BEAM Fokker page 7 of 23 - → INBD STGR 13 STGR 14 STGR 16 STGR 17 RIB 1 HINGE 1 RIB 2 A7 83 RIB 3 847882- RIB 4 Figure 1. Part I Inspection Area - Zone 1 RP-DGUP-18-08. 1658 HINGE 2 RIB 5 Issue number Report number - ZONE 1 RIB 6 VIEW LOOKING UP AT HORIZONTAL STABILIZER LOWER SKIN HINGE 3 RIB 8 RIB 7 LH SHOWN, RH OPPOSITE HINGE 4 RIB 9 RIB 10 FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies HINGE 5 RIB 11 Issue date July 29th, 2019 security class UNCLASSIFIED temp 0572 10-10 ### Page 21 (OCR) FOKKER AEROSTRUCTURES Fokker page 8 of 23 . STGR 14 • OUTBD Hinge 1 RIB 2 Hinge 2 VIEW LOOKING UP AT HORIZONTAL STABILIZER LOWER SKIN RIB 3 VIEW LOOKING UP AT HORIZONTAL STABILIZER LOWER SKIN Figure 2. Damage Map - 1159SST006-1 Issue number Report number RP-DGUP-18-08.1658 LH SHOWN RH SHOWN Hinge 2 RIB 5 Hinge 1 RIB 5 STGR 13 STGR 14 FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies Issue date July 29th, 2019 security class UNCLASSIFIED temp 0572 10-10 ### Page 22 (OCR) FOKKER AEROSTRUCTURES Fokker page 9 of 23 - STGR STGR OUTBD Hinge 4 RIB 9 VIEW LOOKING UP AT HORIZONTAL STABILIZER LOWER SKIN VIEW LOOKING UP AT HORIZONTAL STABILIZER LOWER SKIN Figure 3. Damage Map - 1159SST006-2 Issue number Report number RP-DGUP-18-08 1658 NMOHS H7 RH SHOWN RIB 8 Hinge 3 Hinge 4 RIB 9 FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies STGR Issue date July 29th, 2019 security class UNCLASSIFIED temp 0572 10-10 ### Page 23 (OCR) FOKKER AEROSTRUCTURES page 10 of 23 - Hinge 5 RIB 11 RIB 10 VIEW LOOKING UP AT HORIZONTAL STABILIZER LOWER SKIN VIEW LOOKING UP AT HORIZONTAL STABILIZER LOWER SKIN Figure 4. Damage Map - 1159SST006-3 RP-DGUP-18-08 1658 Issue number Report number LH SHOWN RH SHOWN RIB 10 Hinge 5 STGR 13 STGR 14 AFT RIB 11 INBD STGR 13 STGR 14 L OUTED FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies Issue date July 29th, 2019 security class UNCLASSIFIED temp 0572 10-10 ### Page 24 (No text on this page.) ### Page 25 (OCR) FOKKER AEROSTRUCTURES Fokker page 12 of 23 - • BONDED LOWER SKIN ASSEMBLY ALLOWABLE DAMAGE LIMIT 1> TOTAL BLC AREA MUST BE 5.0 IN% OR LESS DETAIL A TABLE 3 TOTAL BLC AREA LIMIT LIMIT FOR LH AND RH LOWER BONDED SKIN ASSEMBLIES (NOT PER SIDE) Issue number Report number RP-DGUP-18-08.1658 DEFINITION ALL BONDED JOINTS Part II ADL - Table 2, Item 1 - Total BLC Area Limit ITEM LOWER BONDED SKIN ASSEMBLY (LH AND RH SIDE) CLOSURE- FRONT company of Fokker Technologies Issue date July 29th, 2019 security class UNCLASSIFIED FOKKER AEROSTRUCTURES BV i temp 0572 10-10 ### Page 26 (OCR) FOKKER AEROSTRUCTURES Tokker page 13 of 23 - CLOSURE BEAM STRINGER 13 - STRINGER 14 _--- STRINGER 15 STRUCTURAL FASTENER LOCATIONS + NON STRUCTURAL FASTENER LOCATIONS (TYPICALI (TYPICAL) Part II ADL - Table 2, Item 2 - BLC Adjacent to Fasteners Limit (1 of 3) RIB 8 DETAIL B STRUCTURAL AND NON-STRUCTURAL FASTENER LOCATIONS RIBS, BEAMS AND HINGE FITTINGS (TYPICAL) Issue number Report number RP-DGUP-18-08.1658 RIB 7 (HINGE 3' RIB 6 FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies Issue date July 29th, 2019 security class UNCLASSIFIED emp 0572 10-10 ### Page 27 (OCR) FOKKER AEROSTRUCTURES Tokker page 14 of 23 - CLOSURE BEAM _ STRINGER 13 STRINGER 14 STRINGER 15 6600 01 0 1 4 40 STRUCTURAL FASTENER LOCATIONS NON-STRUCTURAL FASTENER LOCATIONS (TYPICAL) (TYPICAL) DETAIL C STRUCTURAL AND NON-STRUCTURAL FASTENER LOCATIONS (TYPICAL) Part II ADL - Table 2, Item 2 - BLC Adjacent to Fasteners Limit (2 of 3) Issue number RIB 2 (HINGE 1) RIB 1 REAR BEAM FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies Issue date July 29th, 2019 security class UNCLASSIFIED temp 0572 10-10 ### Page 28 (OCR) FOKKER AEROSTRUCTURES Tokker page 15 of 23 - - DISTANCE BETWEEN STRUCTURAL FASTENER CENTERLINE AND BLC EDGE MUST BE 1 X FASTENER DIAMETER OR GREATER (TYPICAL) DISTANCE BETWEEN STRUCTURAL FASTENER CENTERLINE AND BLC EDGE MUST BE 1 X FASTENER DIAMETER OR GREATER (TYPICAL) NO BLC ALLOWED BETWEEN RIB FASTENERS COMMON TO SINGLE STRINGER (TYPICAL) DISTANCE BETWEEN STRUCTURAL FASTENER CENTERLINE AND BLC EDGE MUST BE 1X FASTENER DIAMETER OR GREATER (TYPICAL) VIEW D1 VIEW D2 NO BLC ALLOWED BETWEEN FASTENERS WITH CONTINUDUS BONDLINE (TYPICAL) BONDED DOUBLER BONDED DOUBLER- BONDED STRINGER FLANGE STRINGER 13 BONDED STRINGER FLANGE BONDED STRINGER TAB BONDED STRINGER FLANGE STRINGER 14 Part II ADL - Table 2, Item 2 - BLC Adjacent to Fastener Limits (3 of 3) STRINGER 13 STRINGER 14 • STRINGER 15 BLC NOT ALLOWED BLC ALLOWED PROVIDED ALL TABLE 2 ALLOWABLE DAMAGE LIMIT CRITERIA ARE MET ALLOWABLE DAMAGE LIMIT - DISTANCE BETWEEN STRUCTURAL FASTENER CENTERLINE AND BLE EDGE MUST BE 1 X FASTENER DIAMETER - WITH A CONTACOUS BONDL ISERUCTURAL FASTENERS - NO BLC ALLOWED BETWEEN RIB FASTENERS COMMON - IT IS ACCEPTABLE FOR BLE TO ENCOMPASS TABLE 2 ALTURABLE SANAGE LIMIT CRITERIA ARE MET Issue number Report number RP-DGUP-18-08.1658 BLC ADJACENT TO FASTENERS LIMIT TO A SINGLE STRINGER VIEW D2 DETAIL D TABLE 4 VIEW D' DEFINITION BEAM, RIB, HINGE FITTING, CENTERBOX SPLICE AND STRINGER RUN OUT FASTENERS DOUBLER AND STRINGER TOOLING RIVETS ITEM STRUCTURAL FASTENERS NON-STRUCTURAL FASTENERS y of Fokker Technologies Issue date July 29th, 2019 security class UNCLASSIFIED temp 0572 10-10 ### Page 29 (OCR) FOKKER AEROSTRUCTURES Takker page 16 of 23 - TIP RIB RIB 11 (HINGE 5) RIB 9 RIB10 (HINGE 4) BONDED DOUBLERS BONDED DOUBLER LOCATIONS (BONDED STRINGERS ARE NOT SHOWN FOR CLARITY) - THE DISTANCE BETWEEN BLC LOCATIONS MUST BE 1.0 IN. OR GREATER RIBB DETAIL E ALLOWABLE DAMAGE LIMIT - INDIVIDUAL BLC AREA MUST BE 2.0 IN OR LESS RIB 7 (HINGE 3) RIB6 Issue number Report number RP-DGUP-18-08.1658 RIB 5 (HINGE 2) Part II ADL - Table 2, Item 3 - Doubler BLC Limit TABLE 5 DOUBLER BLC LIMIT DEFINITION BONDED DOUBLER JOINTS (HANGE 1) RIB4 CLOSURE REAR BEAM RIB 1 FRONT BEAM ITEM BONDED DOUBLERS a company of Fokker Technologies Issue date July 29th, 2019 security class UNCLASSIFIED FOKKER AEROSTRUCTURES BV temp 0572 10-10 ### Page 30 (OCR) FOKKER AEROSTRUCTURES Fokker page 17 of 23 - - STRINGER 13 - STRINGER 14 RIB 8 STRINGER 14 STRINGER 15 CLOSURE BEAM RIB 7 Issue number Report number RP-DGUP-18-08.1658 Part II ADL - Table 2, Item 4 - Stringer BLC Limit (1 of 3) RIB 2 |HINGE 1| BONDED STRINGERS (TYPICAL FOR STRINGERS 13 THRU 26) DETAIL F BONDED STRINGER LOCATIONS (TYPICAL FOR STRINGERS 13 THROUGH 26) company of Fokker Technologies REAR BEAM Issue date July 29th, 2019 security class UNCLASSIFIED temp 0572 10-10 ### Page 31 (OCR) FOKKER AEROSTRUCTURES Fokker page 18 of 23 - "BETWEEN RIB" BONDED STRINGER ""NEAR RIB" BONDED STRINGER TABLE 6 "NEAR RIB" BONDED STRINGER ZONE WIDTH (CENTERED ON RIB FASTENER CENTERLINE) 3.0 IN. 10.0 IN. 3.0 IN. 3.0 IN. 10.0 IN. 4.0 IN 8.0 IN. 5.0 IN. 8.0 IN. 5.0 IN. 14.0 IN. ¡CE FASTENER CENTERLINE) ZONE ZONE RIB 1 RIB 2 RIB 3 RIB 4 RIB 5 RIB 6 RIB 7 RIB 8 RIB 9 RIB 10 RIB 11 5.0 IN. RIB FASTENER CENTERLINE) RIB 8 •VIEW G1 RP-DGUP-18-08.1658 VINI BONDED STRINGER ZONE DEFINITION Issue number Report number Part II ADL - Table 2, Item 4 - Stringer BLC Limit (2 of 3) RIB FASTENER CENTERLINE) (HINGE 3) RIB 6 DETAIL G (HINGE 2) RIZA 10.0 IN. RIB FASTENER EENTERLINEI CLOSURE BEAM STRINGER 13 STRINGER 14 STRINGER 15 STRINGER 16 STRINGER 17 STRINGER 18 STRINGER 19 STRINGER 20 STRINGER 21 STRINGER 22 STRINGER 23 STRINGER 24 FRONT BEAM Issue date July 29th, 2019 security class UNCLASSIFIED temp 0572 10-10 ### Page 32 (OCR) FOKKER AEROSTRUCTURES TABLE 7 STRINGER BLC LIMIT THE FOLLOWING LIMITS APPLY TO EACH INDIVIDUAL "NEAR RIB" BONDED STRINGER ZONE: NOTE: IF AN INDIVIDUAL BLC LOCATION OVERLAPS A "NEAR RIB" ZONE AND "BETWEEN RIB" ZONE, IT IS DEFINED AS A "NEAR RIB" BLC LOCATION - CUMULATIVE BLC AREA MUST BE 1.0 IN° OR LESS - INDIVIDUAL BLC LOCATION WIDTH (CHORDWISE DIRECTION) MUST BE 0.30 IN. OR LESS - THE DISTANCE BETWEEN AN INDIVIDUAL BLE LOCATION IN A "NEAR RIB" ZONE AND A "BETWEEN RIB" ZONE MUST BE 8.0 IN. OR GREATER THE FOLLOWING LIMITS APPLY TO EACH INDIVIDUAL "BETWEEN RIB" BONDED STRINGER ZONE: - CUMULATIVE BLC AREA MUST BE 1.0 IN° OR LESS - INDIVIDUAL BLC LOCATION WIDTH (CHORDWISE DIRECTION) MUST BE 0.30 IN. OR LESS - THE DISTANCE BETWEEN AN INDIVIDUAL BLC LOCATION IN A "NEAR RIB" ZONE AND A "BETWEEN RIB" ZONE MUST BE 8.0 IN. OR GREATER Tokker page 19 of 23 - "NEAR RIB" BONDED STRINGER ZONES *BETWEEN RIB" BONDED STRINGER ZONES Part II ADL - Table 2, Item 4 - Stringer BLC Limit (3 of 3) DISTANCE BETWEEN INDIVIDUAL BLC LOCATION IN A "NEAR RIB" ZONE AND "BETWEEN RIB" ZONE MUST BE B.I IN. OR GREATER EEN RIB ZONE BETWEEN RIB ZONE STRINGER BLC Issue number Report number RP-DGUP-18-08.1658 RIB 7 JHINGE 3| VIEW G1 CUMULATIVE BLC AREA IN SINGLE ZONE MUST 1.0 IN OR LESS FOR EACH INDIVIDUAL ZONE ETWEEN RIB ZON SETWEEN RIB ZONE INDIVIDUAL BLC LOCATION WIDTH MUST BE 0.30 IN. OR LESS Issue date July 29th, 2019 security class UNCLASSIFIED FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies temp 0572 10-10 ### Page 33 (No text on this page.) ### Page 34 (OCR) FOKKER AEROSTRUCTURES page 21 of 23 - Have more than 48 months elapsed FSBR? res CIS for up to 12 ! complete Part complish FAA Pithin acceptable Perform Part II inspection This logic-based diagram only supplements the information in the accomplishment instructions and compliance paragraphs and is not intended to serve as the primary source Figure 5. Service Bulletin (SB) Process Logic-Based Diagram RP-DGUP-18-08.1658 Issue number Report number Part I Perform Part II Part I or inspection Part II Part II BLC Found? Before further Eligible flight perform for CIS Part II inspectio: Accomplish FAA CIS for up to 48 approved TLT before further flight NOTE: for tasks or compliance times in this SB. ACRONYMS: AD - Airworthiness Directive BLC - Bond Line Corrosion CIS - Continue In Service FAA - Federal Aviation Administration TLT - Time Limited Treatment FSBR - From Service Bulletin Release Accomplish FAA approved permanent repairs or replace skin before further flight Issue date July 29th, 2019 security class UNCLASSIFIED FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies temp 0572 10 ### Page 35 (OCR) FOKKER AEROSTRUCTURES Tokker FAA Approved Repair(s) Submit Part II inspection results to Gulfstream Technical Operations to receive FAA Approved Repairs that must be accomplished pror to further fight Complete part III 48 month TLT prior to further flight Table 2 Item 4 (Bonded Stringer BLC Limit) Individual Stringer BLC Pay cogero Area ≤ 1.0 in27 → NO Individual Stringer BLC Width Width ≤ 0.3 in? NO Stringer BLC Spacing Spacing 2 80 m2 Table 2 Item 3 (Bonded Doubler BLC Limit) No Individual Doubler BLC Location Area Area ≤ 2.0 in?? Doubler BLC Spacing Spacing 21.0 in? Figure 6. Part II ADL Evaluation Process Logic-Based Diagram Issue number Report number RP-DGUP-18-08.1658 Table 2 Item 2 (BLC Adjacent to Fasteners Limit) Yes→ ILC and Structural Fasten BLC Localed In-Between Fasteners? This logic based diagram only supplements the information in the accomplishment instructions and compliance paragraphs and is not intended to serve as the primary source for tasks or compliance 21 See Page 16. 17 and 18 for specific criteria ED - Edge Distance (distance from fastener to BLC edge) Table 2 Item 1 (Total BLC Area Limit) No Total BLC Area Area ≤ 5,0 in° ? [1] See Page 14 for specific cntena. 1D - 1 x fastener diameter BLC - Bond Line Corrosion TLT - Time Limited Treatment times in this SB. ACRONYMS: Issue date July 29th, 2019 security class UNCLASSIFIED FOKKER AEROSTRUCTURES BV is a company of Fokker Technologies temp 0572 10 ### Page 36 (No text on this page.) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.