Airworthiness Directive · Amendment 39-16949 · Landing gear
Bombardier, Inc. Airplanes
This AD applies to Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes having serial numbers (S/Ns) 10003 through 10230 inclusive; and Model CL-600-2D15 (Regional Jet Series 705) airplanes; and Model CL-600-2D24 (Regional Jet Series 900) airplanes having S/Ns 15001 through 15053 inclusive, 15055, and 15056; certificated in any category.
We are superseding an existing airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702), CL-600-2D15 (Regional Jet Series 705), and CL-600- 2D24 (Regional Jet Series 900) airplanes. That AD currently requires repetitive detailed inspections for cracking or deformation, or pulled or missing fasteners, on the lower panel of the left- and right-hand main landing gear (MLG) doors, as applicable, and corrective actions if necessary. That AD also reduces the repetitive inspection interval for certain airplanes. This new AD adds a new modification of the MLG door configuration, and removes certain airplanes from the applicability. This AD was prompted by further analysis of the MLG door by the manufacturer. We are issuing this AD to prevent failure of the lower panel of the MLG door, departure of the lower panel from the airplane, and consequent damage to airplane structure, which could adversely affect the airplane's continued safe flight and landing.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
For Model CL-600-2C10 (Regional Jet series 700 & 701) series airplanes, S/Ns 10003 through 10230 inclusive; and Model CL-600-2D24 (Regional Jet series 900) series airplanes, S/Ns 15002 through 15053 inclusive, 15055, and 15056: Perform the initial inspection specified in paragraph (h) of this AD at the applicable time specified in paragraph (g)(1) or (g)(2) of this AD.
(1) For airplanes with fewer than 1,500 total flight cycles as of November 3, 2003 (the effective date of AD 2003-19-51, Amendment 39-13353 (68 FR 61615, October 29, 2003)): Do the inspections before the accumulation of 1,050 total flight cycles, or within 50 flight cycles after August 15, 2006 (the effective date of AD 2006-14-05, Amendment 39-14676 (71 FR 38979, July 11, 2006)), whichever is later.
(2) For airplanes with 1,500 or more total flight cycles as of November 3, 2003: Do the inspections within 10 flight cycles after August 15, 2006.
For Model CL-600-2C10 (Regional Jet series 700 & 701) series airplanes, S/Ns 10003 through 10230 inclusive; and Model CL-600-2D24 (Regional Jet series 900) series airplanes, S/Ns 15002 through 15053 inclusive, 15055 and 15056: At the applicable time specified in paragraph (g) of this AD, perform detailed inspections of the lower panel, part number (P/N) CC670-10520, of the left- and right-hand MLG doors for the conditions and in the areas specified in paragraphs (h)(1), (h)(2), (h)(3), and (h)(4) of this AD; and Figures 1, 2, and 3 of this AD. For the purposes of this AD, a detailed inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.”
(1) Inspect the cross member, P/N CC670-10572, of the MLG door lower panel for cracking or deformation, in accordance with Figure 2 of this AD.
(2) Inspect the inner skin, P/N CC670-10577, of the MLG door lower panel at the cross member (P/N CC670-10572) for cracking or deformation, or pulled or missing fasteners, in accordance with Figure 2 of this AD.
(3) Inspect the outer skin, P/N CC670-10574, of the MLG door lower panel at the cross member (P/N CC670-10572) for cracking or deformation, or pulled or missing fasteners, in accordance with Figure 2 of this AD.
(4) Inspect the forward member, P/N CC670-10570, and aft member, P/N CC670-10571, of the MLG door lower panel for cracking or deformation, or pulled or missing fasteners, in accordance with Figure 3 of this AD. Figures 1 through 3 of this AD follow.
If no cracking or deformation, or pulled or missing fastener, as applicable, is found during any inspection required by paragraph (h) or (i) of this AD, repeat the inspections thereafter at intervals not to exceed 100 flight cycles.
If any cracking or deformation, or pulled or missing fastener, as applicable, is found during any inspection done in accordance with paragraph (h) or (i) of this AD: Before further flight, accomplish paragraph (j)(1), (j)(2), or (j)(3) of this AD.
(1) Repair the damage in accordance with a method approved by either the Manager, New York Aircraft Certification Office (ACO), FAA; or Transport Canada Civil Aviation (TCCA) (or its delegated agent); and accomplish repetitive inspections in accordance with a method and at a repetitive interval approved by same.
(2) Replace the lower panel assembly, P/N CC670-10520, of the affected MLG door with a new or serviceable lower panel assembly having the same P/N, according to a method approved by either the Manager, New York ACO, FAA; or TCCA (or its delegated agent). Repeat the inspections specified in paragraph (h) of this AD at intervals not to exceed 100 flight cycles.
Note 1 to paragraph (j)(2) of this AD: Guidance on replacing the lower panel assembly can be found in Task Cards 32-12-01-000-801-A01 and 32-12-01-400-801-A01 of the Bombardier CRJ 700/900 Series Regional Jet Aircraft Maintenance Manual.
(3) Remove the lower panel assembly, P/N CC670-10520, of the affected MLG door, and accomplish paragraph (j)(3)(i) or (j)(3)(ii) of this AD, as applicable.
(i) For Model CL600-2C10 (Regional Jet series 700 & 701) series airplanes: Revise the Configuration Deviation List (CDL), Appendix 1, of the airplane flight manual (AFM), to include the following limitations. This may be accomplished by inserting a copy of this AD into the CDL of the AFM.
For Model CL600-2C10 series airplanes: If one or both door panel assemblies, part number CC670-10520, is missing:
(1) Take-off Weight is reduced by 202.5 kg/door, or 450 lb/door.
(2) Enroute Climb Weight is reduced by 445.5 kg/door, or 990 lb/door.
(3) Landing Weight is reduced by 202.5 kg/door, or 450 lb/door.
(4) Fuel Consumption is increased by +3.42% on fuel used/door.
(5) Cruise Airspeed is limited to not more than 0.78 Mach.
(ii) For Model CL-600-2D24 (Regional Jet series 900) series airplanes: Revise the CDL, Appendix 1, of the AFM, to include the following limitations. This may be accomplished by inserting a copy of this AD into the CDL of the AFM.
For Model CL600-2D24 series airplanes: If one or both door panel assemblies, part number CC670-10520, is missing:
(1) Take-off Weight is reduced by 245 kg/door, or 540 lb/door.
(2) Enroute Climb Weight is reduced by 551 kg/door, or 1,215 lb/door.
(3) Landing Weight is reduced by 245 kg/door, or 540 lb/door.
(4) Fuel Consumption is increased by +3.42% on fuel used/door.
(5) Cruise Airspeed is limited to not more than 0.78 Mach.
For all airplanes on which an inspection has not been done in accordance with paragraph (h) of this AD on or before August 15, 2006: At the applicable time specified in paragraph (k)(1) or (k)(2) of this AD, do the inspections of the left- and right-hand inboard MLG doors for damage, in accordance with Part A of the Accomplishment Instructions of Bombardier Alert Service Bulletin A670BA-32-016, Revision A, dated June 7, 2005, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005; or Bombardier Alert Service Bulletin A670BA-32-016, Revision F, dated May 14, 2010, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005. Doing the inspections required by this paragraph terminates the actions required by paragraphs (g) through (j) of this AD. As of the effective date of this AD, use only Bombardier Alert Service Bulletin A670BA-32-016, Revision F, dated May 14, 2010, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005.
(1) For airplanes that have accumulated fewer than 1,500 total flight cycles as of August 15, 2006: Before the accumulation of 1,000 total flight cycles, or within 50 flight cycles after August 15, 2006, whichever occurs later.
(2) For airplanes that have accumulated 1,500 flight cycles or more as of August 15, 2006: Within 10 flight cycles after August 15, 2006.
For airplanes on which an inspection has been done in accordance with paragraph (h) of this AD on or before August 15, 2006: At the applicable time specified in paragraph (l)(1) or (l)(2) of this AD, inspect installed door(s) as specified in paragraph (k) of this AD. Doing the inspections required by this paragraph terminates the actions required by paragraphs (g) through (j) of this AD.
(1) For airplanes that are not subject to an approved alternative method of compliance (AMOC) that extends the inspection interval to 450 flight cycles: Within 100 flight cycles since the last inspection done in accordance with paragraph (h) of this AD.
(2) For airplanes that are subject to an approved AMOC that extends the inspection interval to 450 flight cycles: At the earlier of the times specified in paragraphs (l)(2)(i) and (l)(2)(ii) of this AD:
(i) Within 450 flight cycles since the last inspection done in accordance with paragraph (h) of this AD.
(ii) Within 100 flight cycles since the last inspection done in accordance with paragraph (h) of this AD, or within 50 cycles after August 15, 2006, whichever occurs later.
If no damage is found during any inspection done in accordance with paragraph (k) of this AD, repeat the inspections specified in paragraph (k) of this AD thereafter at intervals not to exceed 100 flight cycles.
If any damage is found during any inspection done in accordance with paragraph (k) of this AD, before further flight, do the actions in paragraph (n)(1) or (n)(2) of this AD. Repeat the inspections specified in paragraph (k) of this AD thereafter at intervals not to exceed 100 flight cycles.
(1) Replace the inboard MLG door with a new or repaired door in accordance with Part B of the Accomplishment Instructions of the Bombardier Alert Service Bulletin A670BA-32-016, Revision A, dated June 7, 2005, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005; or Bombardier Alert Service Bulletin A670BA-32-016, Revision F, dated May 14, 2010, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005; except where those service bulletins specify to contact the manufacturer for repair if no generic repair engineering order (REO) is available, before further flight, repair using a method approved by either the Manager, New York ACO, FAA; or TCCA (or its delegated agent). As of the effective date of this AD, use only Bombardier Alert Service Bulletin A670BA-32-016, Revision F, dated May 14, 2010, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005.
(2) Remove the inboard MLG door in accordance with Part B of the Accomplishment Instructions of the Bombardier Alert Service Bulletin A670BA-32-016, Revision A, dated June 7, 2005, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005; or Bombardier Alert Service Bulletin A670BA-32-016, Revision F, dated May 14, 2010, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005; and accomplish paragraph (n)(2)(i) or (n)(2)(ii) of this AD, as applicable. As of the effective date of this AD, use only Bombardier Alert Service Bulletin A670BA-32-016, Revision F, dated May 14, 2010, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005.
(i) For Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes and Model CL-600-2D15 (Regional Jet Series 705) airplanes: Revise the Configuration Deviation List (CDL), Appendix 1, of the Bombardier Canadair Regional Jet AFM, to include the following limitations. This may be accomplished by inserting a copy of this AD into the CDL of the AFM. Remove any existing CDL limitation required by paragraph (j)(3)(i) of this AD from the AFM.
For Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes and Model CL-600-2D15 (Regional Jet Series 705) airplanes: If one or both door panel assemblies, part number CC670-10520, is missing:
(1) Take-off Weight is reduced by 202.5 kg/door, or 450 lb/door.
(2) Enroute Climb Weight is reduced by 445.5 kg/door, or 990 lb/door.
(3) Landing Weight is reduced by 202.5 kg/door, or 450 lb/door.
(4) Fuel Consumption is increased by +2.5% on fuel used/door.
(5) Cruise Airspeed is limited to not more than 0.78 Mach.
(6) The climb ceiling obtained from the Flight Planning and Cruise Control Manual (FPCCM) must be reduced by 1,000 ft/door.
Note 2 to paragraph (n)(2)(i) of this AD: When a statement with the information specified in paragraph (n)(2)(i) of this AD has been included in the general revisions of the AFM, the general revisions may be inserted into the AFM, and the copy of this AD may be removed from the AFM.
(ii) For Model CL-600-2D24 (Regional Jet Series 900) airplanes: Revise the CDL, Appendix 1, of the Bombardier Canadair Regional Jet AFM, to include the following limitations. This may be accomplished by inserting a copy of this AD into the CDL of the AFM. Remove any existing CDL limitation required by paragraph (j)(3)(ii) of this AD from the AFM.
For Model CL-600-2D24 (Regional Jet Series 900) airplanes: If one or both door panel assemblies, part number CC670-10520, is missing:
(1) Take-off Weight is reduced by 245 kg/door, or 540 lb/door.
(2) Enroute Climb Weight is reduced by 551 kg/door, or 1,215 lb/door.
(3) Landing Weight is reduced by 245 kg/door, or 540 lb/door.
(4) Fuel Consumption is increased by +2.5% on fuel used/door.
(5) Cruise Airspeed is limited to not more than 0.78 Mach.
(6) The climb ceiling obtained from the Flight Planning and Cruise Control Manual (FPCCM) must be reduced by 1,000 ft/door.
Note 3 to paragraph (n)(2)(ii) of this AD: When a statement with the information specified in paragraph (n)(2)(ii) of this AD has been included in the general revisions of the AFM, the general revisions may be inserted into the AFM, and the copy of this AD may be removed from the AFM.
For airplanes on which the door(s) have been removed in accordance with paragraph (j)(3) of this AD: Within 30 days after August 15, 2006, do the revision specified in paragraph (n)(2)(i) or (n)(2)(ii) of this AD, as applicable, and remove any revision required by paragraph (j)(3)(i) or (j)(3)(ii) of this AD.
Although Bombardier Alert Service Bulletin A670BA-32-016, Revision A, dated June 7, 2005, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005; and Bombardier Alert Service Bulletin A670BA-32-016, Revision F, dated May 14, 2010, excluding Appendix A, dated June 2, 2005, and including Appendix B, dated June 2, 2005; specify to submit certain information to the manufacturer, this AD does not include that requirement.
This paragraph provides credit for actions required by paragraphs of (g) through (q) of this AD, if those actions were performed before August 15, 2006 (the effective date of AD 2006-14-05, Amendment 39-14767 (71 FR 38979, July 11, 2006), using Bombardier Alert Service Bulletin A670BA-32-016, dated June 2, 2005.
Within 6,000 flight hours after the effective date of this AD, modify the MLG door, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-017, Revision C, dated May 14, 2010. Doing this modification terminates the requirements of this AD.
This paragraph provides credit for the modification of the MLG door required by paragraph (r) of this AD, if the modification was performed before the effective date of this AD using Bombardier Service Bulletin 670BA-32-017, dated July 24, 2006; Revision A, dated September 26, 2006; or Revision B, dated July 31, 2008; as applicable.
