Airworthiness Directive · Amendment 39-16452 · Air conditioning
Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes
This AD applies to all Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, serial numbers 7003 and subsequent, certificated in any category.
Note 1: This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (l) of this AD. The request should include a description of changes to the required inspections that will ensure the continued operational safety of the airplane.
We are superseding an existing airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Paragraphs (g)(1), (g)(2), and (g)(3) of this AD pertain to the service information referenced in this AD.
(1) Although Bombardier Alert Service Bulletin A601R-21-053, Revision `A,' dated January 28, 2003; and Bombardier Alert Service Bulletin A601R-21-054, dated November 8, 2001; specify to submit certain information to the manufacturer, this AD does not include such a requirement.
(2) Bombardier Alert Service Bulletin A601R-21-054, dated November 8, 2001, recommends sending all damaged check valves to the manufacturer for analysis; however, this AD does not include that requirement.
(3) Accomplishment of the actions specified in Bombardier Alert Service Bulletin A601R-21-053, dated November 8, 2001, before December 2, 2004 (the effective date of AD 2004-22-08), is considered acceptable for compliance with the applicable actions specified in this AD.
Within 500 flight hours after December 2, 2004: Do the detailed inspections and related corrective actions required by paragraphs (h)(1) and (h)(2) of this AD, per the Accomplishment Instructions of Bombardier Alert Service Bulletin A601R-21-053, Revision `A,' dated January 28, 2003; and Bombardier Alert Service Bulletin A601R-21-054, dated November 8, 2001; as applicable.
(1) For airplanes having bulkhead check valves with part number (P/N) 92E20-3/-4, as identified in Bombardier Alert Service Bulletin A601R-21-054, dated November 8, 2001: Inspect the left- and right-hand bulkhead check valves for damage (cracking, breakage). If any damage is found, before further flight, replace the damaged valve. Repeat the inspection at intervals not to exceed 4,000 flight hours until the replacement required by paragraph (j) of this AD is done.
(2) For airplanes having serial numbers 7003 through 7067 inclusive, and 7069 through 7477 inclusive: Inspect the left- and right-hand air supply ducts of the rear bulkhead for damage (tearing, delamination, or cracking). If any damage is found, before further flight, either rework or replace the damaged air supply duct, which ends the inspections for that air supply duct only. If no damage is found, repeat the inspection thereafter at intervals not to exceed 500 flight hours until accomplishment of paragraph (i) of this AD.
Note 2: For the purposes of this AD, a detailed inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.”
(i) Except as required by paragraph (h)(2) of this AD, for airplanes having serial numbers 7003 through 7067 inclusive, and 7069 through 7477 inclusive: Within 5,000 flight hours after December 2, 2004, either rework or replace the left- and right-hand air ducts, as applicable, per the Accomplishment Instructions of Bombardier Alert Service Bulletin A601R-21-053, Revision `A,' dated January 28, 2003; and Bombardier Alert Service Bulletin A601R-21-054, dated November 8, 2001; as applicable. Accomplishment of this paragraph ends the repetitive inspections required by paragraph (h)(2) of this AD.
For airplanes having serial numbers 7003 and subsequent: Within 60 days after the effective date of this AD, revise the Airworthiness Limitations section of the Instructions for Continued Airworthiness to include the information in Bombardier Temporary Revision (TR) 1-2-39, dated December 12, 2008, to Section 2—Systems and Powerplant Program, of Part 1 of the Bombardier CL-600-2B19 Maintenance Requirement Manual (MRM). This task requires replacement of the bulkhead check valves having P/N 92E20-3 or 92E20-4 at intervals not to exceed 3,000 flight hours. Operate the airplane thereafter according to the limitations and procedures in the TR.
(k) Thereafter, except as provided in paragraph (j) of this AD, no alternative replacement times or structural inspection intervals may be approved for this bulkhead check valve.
Note 3: The actions required by paragraph (j) of this AD may be done by inserting a copy of Bombardier TR 1-2-39, dated December 12, 2008, into the MRM, which introduces Task 21-51-21-13. When Bombardier Task 21-51-21-13 has been included in general revisions of the MRM, the general revisions may be inserted into Part 2 of the Airworthiness Limitations section of the MRM, provided the relevant information in the general revision is identical to that in the TR.
Note 4: This AD differs from the MCAI and/or service information as follows: No differences.
