Airworthiness Directive · Amendment 39-18147 · Landing gear
Bombardier, Inc. Airplanes
This AD applies to Bombardier, Inc. Model CL-600-2E25 (Regional Jet Series 1000) airplanes, certificated in any category, serial numbers 19002 and subsequent.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2E25 (Regional Jet Series 1000) airplanes. This AD was prompted by a determination that without an effective maintenance task to maintain the airplane's inherent level of safety, there is a potential that a dormant failure of the alternate release system of the landing gear could occur. This AD requires revising the maintenance or inspection program, as applicable, to incorporate a maintenance task for an operational check of the electro- mechanical actuator and release mechanism of the alternate extension system for the nose landing gear and main landing gear. We are issuing this AD to prevent failure of the alternate release system of the landing gear, which could prevent the landing gear from extending during a failure of the normal landing gear extension system.
Within 30 days after the effective date of this AD, revise the maintenance or inspection program, as applicable, to incorporate Task 32-01-00-101, “Operational Check of the MLG [Main Landing Gear] and NLG [Nose Landing Gear] AES [Alternate Extension System] EMA [Electro-mechanical Actuator] and Release Mechanism (CRJ1000),” for the operational check of the MLG and NLG AES EMA and release mechanism, as specified in Bombardier Temporary Revision (TR) ALI-0472, dated February 27, 2014, to Section 1-32 of Part 2, Airworthiness Limitations, of the Bombardier CRJ Series Regional Jet, Maintenance Requirements Manual, CSP B-053. The initial compliance time for the operational check is at the applicable time specified in paragraphs (g)(1) and (g)(2) of this AD.
(1) For airplanes that have accumulated 540 total flight hours or more as of the effective date of this AD: Within 660 flight hours after the effective date of this AD.
(2) For airplanes that have accumulated less than 540 total flight hours as of the effective date of this AD: Before the accumulation of 1,200 total flight hours.
After accomplishing the revision required by paragraph (g) of this AD, no alternative actions (e.g., inspections) or intervals may be used unless the actions or intervals are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (i)(1) of this AD.
