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Airworthiness directives › 2017-23-09

AD 2017-23-09 Airworthiness Directives; Bombardier, Inc., Airplanes

2017-12-26
2017-11-20
39-19103
FAA-2017-0338
Airframe
—

Applicability*9

This AD applies to the Bombardier, Inc., airplanes identified in paragraphs (c)(1), (c)(2), and (c)(3) of this AD, certificated in any category. (1) Bombardier, Inc., Model CL-600-2A12 (CL-601) airplanes, having serial numbers (S/Ns) 3001 through 3066 inclusive. (2) Bombardier, Inc., Model CL-600-2B16 (CL-601-3A and CL-601-3R Variants) airplanes, having S/Ns 5001 through 5194 inclusive. (3) Bombardier, Inc., Model CL-600-2B16 (CL-604 Variant) airplanes having S/Ns 5301 through 5665 inclusive, and S/Ns 5701 through 5990 inclusive.

Compliance

Comply with this AD within the compliance times specified, unless already done.

Required actions

Within 60 days after the effective date of this AD: Revise the maintenance or inspection program, as applicable, to incorporate inspections for fatigue cracking of the engine mount rib and corrective actions, as applicable, in accordance with a method approved by the Manager, New York ACO Branch, FAA. Note 1 to paragraph (g) of this AD: Guidance can be found in Tasks 54-10-00-106 and 54-50-00-103 of Chapter 5 of the Bombardier Time Limits/Maintenance Checks (TLMC) Manual PSP 601-5 (for Model CL-600-2A12 (CL-601 Variant) airplanes); Bombardier TLMC Manual PSP 601A-5 (for CL-600-2B16 (CL-601-3A and CL-601-3R Variants) airplanes); Bombardier TLMC Manual CL-604 (for Model CL-600-2B16 (CL-604 Variant) airplanes, S/Ns 5301 through 5665 inclusive); and Bombardier TLMC Manual CL-605 (for Model CL-600-2B16 (CL-604 Variant) airplanes, S/Ns 5701 through 5990).

Unsafe condition

This AD was prompted by a determination that the bushing holes on the engine mount rib may not conform to the engineering drawings and that certain inspections of the engine mount rib must be included in the airworthiness limitations section (ALS) of the Instructions for Continued Airworthiness (ICA). We are issuing this AD to detect and correct failure of an engine mount rib. Failure of an engine mount rib could compromise the structural integrity of the engine mount and could lead to subsequent detachment of an engine.

Affected ADs

None.

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