Airworthiness Directive · Amendment 39-18573 · Flight controls
Bombardier, Inc. Airplanes
This AD applies to Bombardier, Inc. Model CL-600-2B16 (CL-604 Variant) airplanes, certificated in any category, serial numbers (S/Ns) 5301 through 5665 inclusive, and 5701 through 5962 inclusive.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2B16 (CL-604 Variant) airplanes. This AD was prompted by a determination that certain maintenance tasks for the horizontal stabilizer trim actuator (HSTA) are inadequate. This AD requires revising the maintenance or inspection program, as applicable, to incorporate new airworthiness limitations for the HSTA. We are issuing this AD to detect and correct premature wear and cracking of the HSTA, which could result in failure of the HSTA and consequent loss of control of the airplane.
Within 30 days after the effective date of this AD: Revise the maintenance or inspection program, as applicable, to incorporate Task 27-42-01-109, Restoration (Overhaul) of the Horizontal Stabilizer Trim Actuator, Part No. 604-92305-7 and Subs (Vendor Part No. 8454-3 and Subs); and Task 27-42-01-111, Detailed Inspection of the Horizontal Trim Actuator (HSTA) Secondary Load Path Indicator, Part No. 604-92305-7 and Subs (Vendor Part No. 8454-3 and Subs); of the applicable document identified in paragraph (g)(1) or (g)(2) of this AD.
(1) For Model CL-600-2B16 (CL-604 Variant) airplanes, serial numbers 5301 through 5665 inclusive: Section 5-10-40, Certification Maintenance Requirements, of Part 2, Airworthiness Limitations, of the Bombardier Challenger 604 Time Limits/Maintenance Checks Manual, Revision 22, dated July 11, 2014.
(2) For Model CL-600-2B16 (CL-604 Variant) airplanes, serial numbers 5701 through 5962 inclusive: Section 5-10-40, Certification Maintenance Requirements, of Part 2, Airworthiness Limitations, of the Bombardier Challenger 605 Time Limits/Maintenance Checks Manual, Revision 10, dated July 11, 2014.
After the maintenance or inspection program has been revised, as 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.
