Airworthiness Directive · Amendment 39-19845 · Landing gear
Bombardier, Inc, Airplanes
This AD applies to Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes, certificated in any category, serial numbers 9001 through 9879 inclusive and 9998 and serial numbers 60001 and subsequent.
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes. This AD was prompted by reports that main landing gear (MLG) trailing arm assemblies were found with compromised paint finish and corrosion on the axle bore inner diameters due to improper removal of contaminants during manufacturing. This AD requires a one-time inspection to determine if an affected MLG trailing arm assembly is installed, repetitive detailed inspections of the inner diameter of the affected MLG trailing arm assembly axle bore for surface finish discrepancies, corrective actions if necessary, and eventual replacement of primer and paint and application of corrosion preventive compound on the inner diameter of all affected MLG trailing arm assembly axle bores, which terminates the repetitive inspections. The FAA is issuing this AD to address the unsafe condition on these products.
For the purposes of this AD, an affected MLG trailing arm assembly is a MLG trailing arm assembly with part number 21410-107 and a serial number listed in Appendix 4, Table 1 of the applicable Bombardier service information specified in figure 1 to paragraphs (g) through (k) and (m) of this AD.
For airplanes having serial numbers 9001 through 9879 inclusive and 9998: Within 30 days after the effective date of this AD: Inspect the right hand and left hand MLG trailing arm assemblies to determine if an affected MLG trailing arm assembly is installed, in accordance with Part A of the Accomplishment Instructions of the applicable service information specified in figure 1 to paragraphs (g) through (k) and (m) of this AD. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number and serial number of the MLG trailing arm assembly can be conclusively determined from that review.
If, during the inspection or review required by paragraph (h) of this AD, it is determined that an affected MLG trailing arm assembly is installed: Before the applicable “1st Inspection Due by Date (MM/DD/YY)” listed for each affected MLG trailing arm assembly serial number in Appendix 4, Table 1 of the applicable Bombardier service information specified in figure 1 to paragraphs (g) through (k) and (m) of this AD, for each affected MLG trailing arm assembly, do a detailed inspection for surface finish discrepancies on the inner diameter of the affected MLG trailing arm assembly axle bore, and, before further flight, do all corrective actions as applicable, in accordance with Part B of the Accomplishment Instructions of the applicable service information specified in figure 1 to paragraphs (g) through (k) and (m) of this AD. For airplanes on which the actions required by paragraph (k) of this AD are done on all affected MLG trailing arm assemblies, no action is required by this paragraph.
For any affected MLG trailing arm assembly on which the inspection required by paragraph (i) of this AD has been accomplished: Within 33 months from the completion of the initial inspection as required by paragraph (i) of this AD, do a detailed inspection of the affected MLG trailing arm assembly for surface finish discrepancies on the inner diameter of the affected MLG trailing arm assembly axle bore, and, before further flight, do all corrective actions as applicable, in accordance with Part C, and Part B as applicable, of the Accomplishment Instructions of the applicable service information specified in figure 1 to paragraphs (g) through (k) and (m) of this AD. For airplanes on which the actions required by paragraph (k) of this AD are done on all affected MLG trailing arm assemblies, no action is required by this paragraph.
For airplanes having serial numbers 9001 through 9879 inclusive and 9998: Within 120 months of each affected MLG trailing arm assembly entry into service, or within 5 days after the effective date of this AD, whichever occurs later, replace the primer and paint and apply the corrosion preventive compound on the inner diameter of the axle bore on all affected MLG trailing arm assemblies, in accordance with Part D of the Accomplishment Instructions of the applicable service information specified in figure 1 to paragraphs (g) through (k) and (m) of this AD. This constitutes terminating action for the requirements of paragraphs (i) and (j) of this AD.
For all airplanes: As of the effective date of this AD, no person may install an affected MLG trailing arm assembly as a replacement part on any airplane, unless that affected MLG trailing arm assembly is marked “SB700-32-041ABC” on the MLG trailing arm assembly modification plate and near the part number.
At the applicable time specified in paragraph (m)(1) or (2) of this AD, submit a report of positive findings of the inspections required by paragraphs (i) and (j) of this AD. Submit the report to Bombardier in accordance with the applicable service information specified in figure 1 to paragraphs (g) through (k) and (m) of this AD. If operators have reported findings as part of obtaining any corrective actions approved by Bombardier, Inc.'s TCCA Design Approval Organization (DAO), they are not required to report those findings as specified in this paragraph.
(1) If the inspection was done on or after the effective date of this AD: Submit the report within 10 days after the inspection.
(2) If the inspection was done before the effective date of this AD: Submit the report within 10 days after the effective date of this AD.
