Airworthiness Directive · Amendment 39-17569 · Flight controls
Bombardier, Inc. Airplanes
This AD applies to the airplanes specified in paragraphs (c)(1), (c)(2), and (c)(3) of this AD, certificated in any category.
(1) Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes, serial numbers 10002 through 10999 inclusive.
(2) Bombardier, Inc. Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900) airplanes, serial numbers 15001 through 15990 inclusive.
(3) Bombardier, Inc. Model CL-600-2E25 (Regional Jet Series 1000) airplanes, serial numbers 19001 through 19990 inclusive.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2C10 (Regional Jet Series 700, 701, & 702) airplanes, Model CL-600-2D15 (Regional Jet Series 705) airplanes, Model CL-600-2D24 (Regional Jet Series 900) airplanes, and Model CL- 600-2E25 (Regional Jet Series 1000) airplanes. This AD was prompted by reports of erratic pitch movement and oscillatory behaviors of the elevator control system. This AD requires repetitive replacement of the bellcrank supports on the inner rear spar of the horizontal stabilizer with new, improved bellcrank supports. We are issuing this AD to prevent erratic pitch movement and transient accelerations, which could result in a significant pitch upset, and injuries to passengers and flightcrew.
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 any airplane with bellcrank supports having part numbers AV670-23350-001 (left side) and AV670-23350-002 (right side), on the inner rear spar of the horizontal stabilizer: At the applicable time specified in paragraph (g)(1), (g)(2), (g)(3), or (g)(4) of this AD, replace the affected bellcrank supports with new bellcrank supports, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 670BA-27-064, dated December 11, 2012. Repeat the replacement thereafter at intervals not to exceed 20,000 flight hours.
(1) For airplanes that have, as of the effective date of this AD, accumulated 18,000 total flight hours or less: Replace before the accumulation of 24,600 total flight hours.
(2) For airplanes that have, as of the effective date of this AD, accumulated more than 18,000 total flight hours, but 23,400 total flight hours or less: Replace within 6,600 flight hours after the effective date of this AD.
(3) For airplanes that have, as of the effective date of this AD, accumulated more than 23,400 total flight hours, but 28,500 total flight hours or less: Replace before the accumulation of 30,000 total flight hours.
(4) For airplanes that have, as of the effective date of this AD, accumulated more than 28,500 total flight hours: Within 1,500 flight hours after the effective date of this AD.
