Airworthiness Directive · Amendment 39-21730 · Landing gear
MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
This AD applies to the MHI RJ Aviation ULC (type certificate previously held by Bombardier, Inc.) airplanes, certificated in any category, specified in paragraphs (c)(1) through (3) of this AD.
(1) Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) and Model CL-600-2C11 (Regional Jet Series 550) airplanes, serial numbers 10002 and subsequent.
(2) Model CL-600-2D15 (Regional Jet Series 705) airplanes and CL-600-2D24 (Regional Jet Series 900) airplanes, serial numbers 15001 and subsequent.
(3) Model CL-600-2E25 (Regional Jet Series 1000) airplanes, serial numbers 19001 and subsequent.
The FAA is adopting a new airworthiness directive (AD) for MHI RJ Aviation ULC Model CL-600-2C10 (Regional Jet Series 700, 701 & 702), CL-600-2C11 (Regional Jet Series 550), CL-600-2D15 (Regional Jet Series 705), CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet Series 1000) airplanes. This AD was prompted by reports and a design review indicating that there could be possible corrosion on the main landing gear (MLG) outer cylinder at the interface with the gland nut on the shock strut installation and on the forward and aft trunnion pins in the MLG dressed shock strut assembly. This AD requires detailed inspections for corrosion on the MLG outer cylinder assemblies, certain MLG dressed shock strut assemblies, and the MLG outer cylinder at the gland nut threads, thread relief groove, and chamfer; a detailed inspection for the presence of corrosion-inhibiting compound (CIC) on the MLG forward and aft trunnion pins and grease adapter assemblies; applicable corrective actions; application of primer, paint, and CIC as applicable; re-identification of certain part numbers; and marking of the MOD STATUS field of the nameplate of certain parts. The FAA is issuing this AD to address the unsafe condition on these products.
For airplanes identified in paragraphs (c)(1) and (2) of this AD with MLG outer cylinder assemblies and MLG dressed shock strut assemblies having part numbers and serial numbers specified in the effectivity tables in Section 1.A.(1) of Bombardier Service Bulletin 670BA-32-024, Revision C, dated February 11, 2015 (Bombardier Service Bulletin 670BA-32-024, Revision C): At the applicable time specified in paragraph (g)(1) or (2) of this AD, do a detailed visual inspection for corrosion, and all other required actions specified in, and in accordance with, Section 2., Part A, of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-024, Revision C.
(1) For MLG assemblies that have accumulated 12,500 total flight hours or less, and have been in service for 72 months or less from entry into service or the last overhaul date: Within 6,500 flight hours or 36 months, whichever comes first, after the effective date of this AD.
(2) For MLG assemblies that have accumulated more than 12,500 total flight hours, or have been in service for more than 72 months from entry into service or the last overhaul date: Within 3,500 flight hours or 24 months, whichever occurs first, after the effective date of this AD.
For airplanes identified in paragraphs (c)(1) and (2) of this AD, equipped with MLG dressed shock strut assemblies having part numbers (P/Ns) 49000-25 through 49000-46 and P/Ns 49050-15 through 49050-22, on which the MLG active dynamic seal has been replaced with the spare dynamic seal as specified in Bombardier CRJ700/705/900/1000 Aircraft Maintenance Manual (AMM), CSP B-001, Task 32-11-10-960-802, Revision 37, dated November 25, 2011, or earlier: At the applicable time specified in paragraph (h)(1) or (2) of this AD, do a detailed visual inspection of the MLG dressed shock strut assemblies for corrosion, and all applicable corrective actions, in accordance with Section 2., Part B, of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-024, Revision C.
(1) For MLG assemblies that have accumulated 12,500 total flight hours or less, and have been in service for 72 months or less from entry into service or the last overhaul date: Within 6,500 flight hours or 36 months, whichever comes first, after the effective date of this AD.
(2) For MLG assemblies that have accumulated more than 12,500 total flight hours, or have been in service for more than 72 months from entry into service or the last overhaul date: Within 3,500 flight hours or 24 months, whichever occurs first, after the effective date of this AD.
For airplanes identified in paragraphs (c)(1) through (3) of this AD equipped with MLG outer cylinder assemblies having part numbers and serial numbers specified in Section 1.A., Effectivity, of Bombardier Service Bulletin 670BA-32-052, dated February 9, 2015: Within 6,500 flight hours or 36 months, whichever occurs first after the effective date of this AD, do a detailed visual inspection of the MLG shock strut outer cylinder assemblies, and do all other required actions specified in, and in accordance with, Section 2. of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-052, dated February 9, 2015.
For airplanes identified in paragraphs (c)(1) through (3) of this AD equipped with MLG forward and aft trunnion pins and grease adapter assemblies having part numbers and serial numbers specified in Section 1.A., Effectivity, of Bombardier Service Bulletin 670BA-32-034, Revision B, dated December 21, 2018 (Bombardier Service Bulletin 670BA-32-034, Revision B): At the applicable time specified in paragraph (j)(1) or (2) of this AD, do a detailed visual inspection of the MLG forward and aft trunnion pins and do all applicable corrective actions, in accordance with Section 2.B. and paragraphs 2.C.(6) and (8) of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-034, Revision B.
Note 1 to the introductory text of paragraph (j): The corrective action is applicable only to MLG forward and aft trunnion pins having P/Ns 49101-9, -11, and -13 reworked from P/Ns 49101-1, -5, and -7, as specified in the procedures in Goodrich Service Bulletin 49101-32-47, any revision. The corrective action is not applicable to MLG forward and aft trunnion pins having P/Ns 49101-9, -11, and -13 that were installed as original equipment or purchased from Goodrich Landing Gear.
(1) For MLG forward and aft trunnion pins and grease adapter assemblies that have not had the procedures specified in Goodrich Service Bulletin 49101-32-47, any revision, incorporated, at the applicable time specified in paragraph (j)(1)(i) or (ii) of this AD.
(i) For MLG forward and aft trunnion pins that have accumulated 10,000 total flight hours or less, and have been in service 60 months or less from the entry into service or last overhaul date: Within 6,500 flight hours or 36 months, whichever occurs first, after the effective date of this AD.
(ii) For MLG forward and aft trunnion pins that have accumulated more than 10,000 total flight hours, or have been in service for more than 60 months from entry into service or last overhaul date: Within 3,000 flight hours or 24 months, whichever occurs first, after the effective date of this AD.
(2) For MLG forward and aft trunnion pins that have had the procedures specified in Goodrich Service Bulletin 49101-32-47, any revision, incorporated: Within 6,500 flight hours or 36 months, whichever occurs first, after the effective date of this AD.
For airplanes identified in paragraphs (c)(1) through (3) of this AD equipped with MLG forward and aft trunnion pins having P/Ns 49101-9, 49101-11, and 49101-13 that were maintained in accordance with the tasks identified in paragraphs (k)(1) through (4) of this AD: Within 6,500 flight hours or 36 months after the effective date of this AD, whichever occurs first, do a detailed visual inspection of the MLG forward and aft trunnion pins, and do all applicable corrective actions, in accordance with Section 2. of the Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-039, dated February 29, 2012.
Note 2 to the introductory text of paragraph (k): The corrective action described in this paragraph is not applicable to MLG forward and aft trunnion pins having P/Ns 49101-9, -11, and -13 reworked from P/Ns 49101-1, -5, and -7 as specified in the procedures in Goodrich SB 49101-32-47, any revision. The corrective action described in this paragraph is applicable to MLG forward and aft trunnion pins having P/Ns 49101-9, -11, and -13 installed as original equipment or purchased from Goodrich Landing Gear.
(1) Bombardier CRJ700/705/900/1000 AMM, CSP B-001, Task 32-11-05-400-801 A01, Revision 31, dated March 20, 2010, or earlier.
(2) Bombardier CRJ700/705/900/1000 AMM, CSP B-001, Task 32-11-05-400-801 A02, Revision 34, dated November 20, 2010, or earlier.
(3) Bombardier CRJ700/705/900/1000 AMM, CSP B-001, Task 32-11-05-400-804 A01, Revision 35, dated March 20, 2011, or earlier.
(4) Bombardier CRJ700/705/900/1000 AMM, CSP B-001, Task 32-11-05-400-805 A01, Revision 35, dated March 20, 2011, or earlier.
