Airworthiness Directive · Amendment 39-18666 · Landing gear
Bombardier, Inc. Airplanes
This AD applies to the Bombardier, Inc. airplanes identified in paragraphs (c)(1) and (c)(2) of this AD, certificated in any category.
(1) Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes, having serial numbers (S/Ns) 10002 through 10333 inclusive.
(2) Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900) airplanes, having S/Ns 15001 through 15284 inclusive.
We are superseding Airworthiness Directive (AD) 2010-23-19 for certain Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, and 702) airplanes, Model CL-600-2D15 (Regional Jet Series 705) airplanes, and Model CL-600-2D24 (Regional Jet Series 900) airplanes. AD 2010-23-19 required repetitive inspections for damage of the main landing gear (MLG) inboard doors and fairing, and corrective actions if necessary. This new AD requires repetitive inspections for damage of the MLG inboard doors, MLG fairing, and adjacent structures of the MLG inboard doors, and corrective actions if necessary; replacement of the MLG fairing seal; and a terminating action involving increasing the clearances between the MLG fairing and MLG door. This new AD also adds one airplane and removes others from the applicability. This AD was prompted by reports of the MLG failing to fully extend. We are issuing this AD to prevent loss of controllability of the airplane during landing.
(1) This paragraph restates the requirements of paragraph (g) of AD 2010-23-19, with new service information. For airplanes having S/Ns 10003 through 10313 inclusive, 15001 through 15238 inclusive, and 15240 through 15255 inclusive: Within 50 flight cycles after November 24, 2010 (the effective date of AD 2010-23-19), do the inspections specified in paragraphs (g)(1)(i) through (g)(1)(iv) of this AD, in accordance with “PART A—Inspection of the MLG Inboard Doors, MLG Fairing and Adjacent Structure,” of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision A, dated October 22, 2010; or Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013; as applicable. As of the effective date of this AD, use only Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013, to accomplish the actions required by this paragraph. Repeat the inspections thereafter at intervals not to exceed 600 flight hours.
(i) Do a detailed inspection for damage (including wear lines, cracks, fraying, tears, and evidence of chafing) of the rubber seal of the MLG fairing.
(ii) Do a detailed inspection for damage (including missing and broken rollers, loose and missing fasteners, and damaged and missing stops) of the MLG inboard doors, and for damage along the edge of the MLG inboard door adjacent to the MLG fairing.
(iii) Do a detailed inspection of the MLG fairing for damage (including missing forward and aft stops, and loose and missing fasteners), and for damage along the edge of the MLG fairing adjacent to the MLG door.
(iv) Do a detailed inspection for damage (including missing stops, loose and missing fasteners, and missing wedges) of the stops and wedges on the forward and aft spars.
(2) This paragraph restates the requirements of paragraph (h) of AD 2010-23-19, with revised service information. For airplanes not identified in paragraph (g)(1) of this AD, excluding the airplane having S/N 10002, and excluding airplanes having MLG fairing seals having part numbers (P/Ns) CC670-39244-5 and CC670-39244-6: Within 600 flight hours after November 24, 2010 (the effective date of AD 2010-23-19), do the inspections specified in paragraphs (g)(2)(i) through (g)(2)(iv) of this AD, in accordance with “PART A—Inspection of the MLG Inboard Doors, MLG Fairing and Adjacent Structure,” of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision A, dated October 22, 2010; or Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013. As of the effective date of this AD, use only Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013, to accomplish the actions required by this paragraph. Repeat the inspections thereafter at intervals not to exceed 600 flight hours.
(i) Do a detailed inspection for damage (including wear lines, cracks, fraying, tears, and evidence of chafing) of the rubber seal of the MLG fairing.
(ii) Do a detailed inspection for damage (including missing and broken rollers, loose and missing fasteners, and damaged and missing stops) of the MLG inboard doors, and for damage along the edge of the MLG inboard door adjacent to the MLG fairing.
(iii) Do a detailed inspection of the MLG fairing for damage (including missing forward and aft stops, and loose and missing fasteners), and for damage along the edge of the MLG fairing adjacent to the MLG door.
(iv) Do a detailed inspection for damage (including missing stops, loose and missing fasteners, and missing wedges) of the stops and wedges on the forward and aft spars.
(3) This paragraph restates the requirements of paragraph (i) of AD 2010-23-19, with revised service information. If damage to only the rubber seal on the MLG fairing is found during any inspection required by paragraph (g)(1) or (g)(2) of this AD, before further flight, do either action specified in paragraph (g)(3)(i) or (g)(3)(ii) of this AD.
(i) Replace the rubber seal on the MLG fairing with a new rubber seal, in accordance with “PART B—Replacement of the Forward Rubber Seal on the MLG Fairing,” of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision A, dated October 22, 2010; or the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013. As of the effective date of this AD, use only Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013, to accomplish the actions required by this paragraph.
(ii) Remove the MLG inboard door, in accordance with “PART C—Removal of MLG Inboard Door,” of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision A, dated October 22, 2010; or Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013. For airplanes on which the MLG inboard door is re-installed, do the installation of the MLG inboard door in accordance with “PART D—Installation of MLG Inboard Door,” of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision A, dated October 22, 2010; or Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013. As of the effective date of this AD, use only Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013, to accomplish the actions required by this paragraph.
(4) This paragraph restates the requirements of paragraph (j) of AD 2010-23-19, with revised repair instructions. If damage other than the damage identified in paragraph (g)(3) of this AD is found during any inspection required by paragraph (g)(1) or (g)(2) of this AD, before further flight, contact the Bombardier Regional Aircraft Customer Response Center for repair instructions and do the repair; or repair using a method approved by the Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA; or Transport Canada Civil Aviation (TCCA); or Bombardier, Inc.'s TCCA Design Approval Organization (DAO). As of the effective date of this AD, if damage other than the damage identified in paragraph (g)(3) of this AD is found during any inspection required by paragraph (g)(1) or (g)(2) of this AD, before further flight, repair using a method approved by the Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA; or TCCA; or Bombardier, Inc.'s TCCA DAO.
For airplanes on which an MLG fairing seal having P/N CC670-39244-1 or P/N CC670-39244-2 is installed: At the applicable time specified in paragraph (i)(1) of this AD, do the inspections specified in paragraphs (h)(1) through (h)(4) of this AD, in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013, except as specified in paragraph (o) of this AD. Repeat the inspections thereafter at the time specified in paragraph (i)(2) of this AD.
(1) Do a detailed inspection for damage (including cracking, cuts, and tears in the material (fabric/rubber)) of the MLG fairing and seal.
(2) Do a detailed inspection for damage (including missing and broken rollers, loose and missing fasteners, and damaged and missing stops) of the MLG inboard doors, and for damage along the edge of the MLG inboard door adjacent to the MLG fairing.
(3) Do a detailed inspection of the MLG fairing for damage (including missing forward and aft stops, and loose and missing fasteners), and for damage (including, but not limited to, corrosion, cracking, and dents) along the edge of the MLG fairing adjacent to the MLG door.
(4) Do a detailed inspection for damage (including missing stops, loose and missing fasteners, and missing wedges) of the stops and wedges on the forward and aft spars.
This paragraph specifies the compliance times for the actions required by paragraph (h) of this AD.
(1) The initial compliance time is specified in paragraphs (i)(1)(i) and (i)(1)(ii) of this AD.
(i) For airplanes having S/Ns 10002 through 10313 inclusive; 15001 through 15238 inclusive; and S/Ns 15240 through 15255 inclusive: Within 50 flight cycles after the effective date of this AD.
(ii) For all other airplane serial numbers: Within 600 flight hours after the effective date of this AD.
(2) Repeat the inspections specified in paragraph (h) of this AD at the earlier of the times specified in paragraphs (i)(2)(i) and (i)(2)(ii) of this AD.
(i) Repeat the inspections within 200 flight hours after the effective date of this AD. Repeat the inspections thereafter at intervals not to exceed 200 flight hours.
(ii) Repeat the inspections within 600 flight hours after the most recent inspection done in accordance with the requirements of AD 2010-23-19. Repeat the inspections thereafter at intervals not to exceed 200 flight hours.
(1) If any damage to the MLG fairing seal is found during any inspection required by paragraph (h) of this AD: Before further flight, do the actions specified in paragraph (j)(1)(i) or (j)(1)(ii) of this AD, except as specified in paragraph (o) of this AD.
(i) Before further flight, remove the MLG inboard doors, in accordance with Part C of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013. For airplanes on which the MLG inboard door is re-installed, do the installation of the MLG inboard door in accordance with Part D of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013.
(ii) Before further flight, replace the MLG fairing seals, in accordance with Part E of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013. Within 200 flight hours after installing the MLG fairing seals, do the actions required by paragraph (h) of this AD.
(2) If any damage other than that specified in paragraph (j)(1) of this AD is found, or if parts or fasteners are found missing, during any inspection required by paragraph (h) of this AD, before further flight, repair using a method approved by the Manager, New York ACO, ANE-170, FAA; or TCCA; or Bombardier, Inc.'s TCCA DAO.
Within 2,500 flight hours or 12 months, whichever occurs first, after the effective date of this AD: Replace any MLG fairing seals having P/Ns CC670-39244-1 and CC670-39244-2 with P/Ns CC670-39244-5 and CC670-39244-6, respectively, in accordance with Part E of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013, except as specified in paragraph (o) of this AD.
Within 600 flight hours after installing fairing seals having P/Ns CC670-39244-5 or CC670-39244-6: Do the inspections specified in paragraphs (h)(1) through (h)(4) of this AD, in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013. If any damage to the MLG fairing seal is found during any inspection required by this paragraph: Before further flight, do the applicable actions specified in paragraph (j)(1) or (j)(2) of this AD. If no damage is found during any inspection required by this paragraph, repeat the inspections specified in paragraphs (h)(1) through (h)(4) of this AD thereafter at intervals not to exceed 600 flight hours, except as provided in paragraph (m) of this AD.
After accomplishment of the initial inspections specified in paragraph (l) of this AD, removal of the MLG inboard door, in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013, defers the repetitive inspections required by paragraph (l) of this AD until the MLG inboard door is re-installed. For airplanes on which the MLG inboard door is re-installed, do the installation of the MLG inboard door in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013, except as specified in paragraph (o) of this AD; and before the accumulation of 600 flight hours on the MLG inboard door since the actions required by paragraph (k) of this AD were accomplished, do the inspections specified in paragraph (l) of this AD, and repeat the inspections thereafter at the applicable time specified in paragraph (l) of this AD.
Within 6,600 flight hours or 36 months, whichever occurs first after the effective date of this AD: Modify the airplane by increasing the clearance between the left and right MLG fairings and the left and right MLG doors; and do all applicable related investigative and corrective actions; in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-040, Revision F, dated February 11, 2016, including Appendix A, Revision A, and Appendix B, Revision B, both dated July 12, 2014, except as provided by paragraph (o) of this AD. Do all applicable related investigative and corrective actions before further flight. If an MLG door has been removed, the modification may be delayed until the MLG door is re-installed in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013. Accomplishing this modification terminates the requirements of paragraphs (g) through (m) of this AD for that MLG door.
Where Bombardier Alert Service Bulletin A670BA-32-030, Revision D, dated August 6, 2013; and Bombardier Service Bulletin 670BA-32-040, Revision F, dated February 11, 2016, including Appendix A, Revision A, and Appendix B, Revision B, dated July 12, 2014; specify to contact the Bombardier Customer Response Center for an analysis or to get an approved disposition, repair using a method approved by the Manager, New York ACO, ANE-170, FAA; or TCCA; or Bombardier, Inc.'s TCCA DAO.
