Airworthiness Directive · Amendment 39-19632 · Wings
Bombardier, Inc., Airplanes
This AD applies to Bombardier, Inc., Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category, serial numbers 7002 and subsequent.
We are superseding Airworthiness Directive (AD) 2008-24-14, which applied to all Bombardier, Inc., Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. AD 2008-24-14 required revising the instructions for continued airworthiness to incorporate certain airworthiness limitations for the main landing gear (MLG) trunnion fitting assembly. This AD requires revising the maintenance or inspection program, as applicable, to incorporate certain airworthiness limitations (AWLs). This AD also requires reworking the trunnion fitting in order to meet new structural safe-life limits. This AD was prompted by reports of cracks on the MLG trunnion fitting during fatigue testing; the introduction of new AWL tasks with revised inspection, modification, and safe-life requirements; and a determination that the trunnion fitting lower flange and both forward and aft bore holes are also subject to fatigue cracking. We are issuing this AD to address the unsafe condition on these products.
This paragraph restates the requirements of paragraph (f)(1) of AD 2008-24-14, with no changes. Within 30 days after December 19, 2008 (the effective date of AD 2008-24-14), revise the Airworthiness Limitations Section (ALS) of the Instructions for Continued Airworthiness to incorporate AWL 57-21-161, as identified in Bombardier Temporary Revision 2B-2136, dated May 1, 2008, to the Bombardier CL-600-2B19 Maintenance Requirements Manual, Part 2, Appendix B— Airworthiness Limitations. The initial compliance time for the task starts from the applicable time specified in table 1 to paragraphs (g) and (j) of this AD or table 2 to paragraphs (g) and (j) of this AD, as applicable. Repeat the inspection thereafter at the applicable interval specified in Bombardier Temporary Revision 2B-2136, dated May 1, 2008.
This paragraph restates the requirements of paragraph (f)(2) of AD 2008-24-14, with a new exception: Except as required by paragraph (i) of this AD, after accomplishing the actions specified in paragraph (g) of this AD, no alternative inspections or inspection intervals may be used unless the inspection or inspection interval is approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (p)(1) of this AD.
(1) Within 60 days after the effective date of this AD: Revise the existing maintenance or inspection program, as applicable, by incorporating the AWL tasks specified in figure 1 to paragraphs (i)(1) and (o) of this AD. Except as specified in paragraph (j) of this AD, the initial compliance times for the tasks are at the applicable times specified in the temporary revisions (TRs) identified in figure 1 to paragraphs (i)(1) and (o) of this AD, or within 60 days after the effective date of this AD, whichever occurs later. When the information in AWL tasks identified in the TRs specified in figure 1 to paragraphs (i)(1) and (o) of this AD has been included in the general revisions of Bombardier Maintenance Requirements Manual (MRM), CSP A-053, Part 2, Appendix B, the general revisions may be inserted in the MRM, and the TRs may be removed. Accomplishing the revision required by this paragraph terminates the actions required by paragraph (g) of this AD. Where the compliance times for the repetitive inspections and life limits specified in the TRs identified in figure 1 to paragraphs (i)(1) and (o) of this AD specify “landings,” those compliance times are based on the landings of the affected part.
(2) Within 60 days after the effective date of this AD: Revise the existing maintenance or inspection program, as applicable, by removing the AWL tasks specified in figure 2 to paragraph (i)(2) of this AD.
(1) For AWL 57-21-161, the compliance time for the initial inspection of AWL 57-21-161 is as specified in table 1 to paragraphs (g) and (j) of this AD or table 2 to paragraphs (g) and (j) of this AD, as applicable, or within 60 days after the effective date of this AD, whichever occurs later.
(2) For AWL 57-21-161, the compliance time for the limitation section is at the applicable time specified in AWL 57-21-161 or within 2,000 flight cycles after the effective date of this AD, whichever occurs later.
(3) For AWL 57-21-145 and AWL 57-21-155, the compliance times for the initial inspections are at the applicable times specified in AWL 57-21-145 and AWL 57-21-155 or within 2,000 flight cycles after the effective date of this AD, whichever occurs later. Where the compliance times for the initial inspections in the AWLs specify “landings,” those compliance times are based on the landings of the airplane.
(4) For AWL 57-21-145 and AWL 57-21-155, the compliance times for the limitation sections is at the applicable time specified in AWL 57-21-145 and AWL 57-21-155 or within 2,000 flight cycles after the effective date of this AD, whichever occurs later.
After the maintenance or inspection program has been revised as required by paragraph (i) of this AD, no alternative actions (e.g., inspections) or intervals may be used unless the actions or intervals are approved as an AMOC in accordance with the procedures specified in paragraph (p)(1) of this AD.
(1) Except as specified in paragraph (m)(1) of this AD: At or before the accumulation of 34,900 total flight cycles, or within 2,000 flight cycles after the effective date of this AD, whichever occurs later, rework the MLG trunnion (cold working of fastener holes in the MLG trunnion fitting, and all applicable related investigative and corrective actions) in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 601R-57-046, Revision C, dated December 20, 2012. Do all applicable related investigative and corrective actions before further flight.
(2) At or before the accumulation of 38,900 total flight cycles, or within 2,000 flight cycles after the effective date of this AD, whichever occurs later, rework the MLG trunnion (installation of forcemate bushings in the MLG trunnion, and all applicable related investigative and corrective actions) in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 601R-57-047, Revision B, dated October 2, 2012. Do all applicable related investigative and corrective actions before further flight.
(3) Except as specified in paragraph (m)(2) of this AD: At or before the accumulation of 34,900 total flight cycles, or within 2,000 flight cycles after the effective date of this AD, whichever occurs later, rework the MLG trunnion (cold work of holes on the web of the MLG trunnion, and all applicable related investigative and corrective actions) in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 601R-57-048, Revision C, dated June 6, 2013. Do all applicable related investigative and corrective actions before further flight.
(1) For airplanes on which Bombardier Service Bulletin 601R-57-046, Revision A, dated December 21, 2009; or Bombardier Service Bulletin 601R-57-046, Initial Issue, dated July 17, 2009; was accomplished prior to the effective date of this AD: Within 6 months after the effective date of this AD, do Part G of the Accomplishment Instructions of Bombardier Service Bulletin 601R-57-046, Revision C, dated December 20, 2012.
(2) For airplanes on which Bombardier Service Bulletin 601R-57-048, Revision A, dated November 24, 2009; or Bombardier Service Bulletin 601R-57-048, Initial Issue, dated July 17, 2009; was accomplished prior to the effective date of this AD: Within 6 months after the effective date of this AD, do Part C of the Accomplishment Instructions of Bombardier Service Bulletin 601R-57-048, Revision C, dated June 6, 2013.
