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3-15, 18-23 1 December 29, 1970
The Director of the Federal Register approved the incorporation by reference of these documents
in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Boeing Commercial Airplanes, Long
Beach Division, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Data and
Service Management, Dept. C1-L5A (D800-0024), for a copy of this service information. You may
review copies at the Docket Management Facility, U.S. Department of Transportation, 400 Seventh
Street, SW., Room PL-401, Nassif Building, Washington, DC; on the Internet at http://dms.dot.gov;
or at the National Archives and Records Administration (NARA). For information on the availability
of this material at the NARA, call (202) 741-6030, or go to
http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
Issued in Renton, Washington, on February 2, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification Service.
[FR Doc. E7-2416 Filed 2-13-07; 8:45 am]
37 BW 2007-04
FAA
Aircraft Certification Service
AIRWORTHINESS DIRECTIVE
www.faa.gov/aircraft/safety/alerts/
www.gpoaccess.gov/fr/advanced.html
2007-04-07 Bombardier, Inc. (Formerly de Havilland, Inc.): Amendment 39-14938. FAA-2006-
26241; Directorate Identifier 2006-NM-155-AD.
Effective Date
(a) This AD becomes effective March 21, 2007.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Bombardier Model DHC-8-400 series airplanes, certificated in any
category; as identified in Bombardier Service Bulletin 84-78-01, Revision `A,' dated
September 15, 2005.
Unsafe Condition
(d) This AD results from a report of a discrepancy found during a maintenance inspection on a
V-band clamp located on the engine exhaust duct shroud. The clamp ends were touching (although
the correct fastener torque had been applied), resulting in reduced clamp force on the flanges. We are
issuing this AD to prevent vibration in the duct shroud and fretting of the V-band clamp and flanges,
which could result in cracking of the flanges and consequent release of hot exhaust gases from the
engine tailpipe and damage to adjacent structure. This situation could trigger the fire warning system
and result in an in-flight emergency, such as the flightcrew shutting down the engine and activating
the fire suppression system.
Compliance
(e) You are responsible for having the actions required by this AD performed within the
compliance times specified, unless the actions have already been done.
Inspection/Investigative and Corrective Actions
(f) Within 5,000 flight hours after the effective date of this AD: Inspect to determine the part
number (P/N) of the V-band clamps on the engine exhaust duct shroud in accordance with the
Accomplishment Instructions of Bombardier Service Bulletin 84-78-01, Revision `A,' dated
September 15, 2005. For any V-band clamp having P/N VC1642A-2030-A or VC1642A-1875-A,
before further flight, determine the manufacturer's date and do all applicable related investigative and
corrective actions (including inspecting the flange of the shroud assemblies for discrepancies), by
accomplishing all the actions specified in the Accomplishment Instructions of the service bulletin;
2007-04-07 2
38 BW 2007-04
except as provided by paragraph (g) of this AD. Do all applicable related investigative and corrective
actions before further flight.
(g) If, during the accomplishment of the corrective actions required by paragraph (f) of this AD,
the service bulletin specifies contacting the manufacturer for repair instructions, before further flight,
repair in accordance with a method approved by either the Manager, New York Aircraft Certification
Office (ACO), FAA; or Transport Canada Civil Aviation (TCCA) (or its delegated agent).
Actions Accomplished According to Previous Issue of Service Bulletin
(h) Actions accomplished before the effective date of this AD according to Bombardier Service
Bulletin 84-78-01, dated March 22, 2005, are considered acceptable for compliance with the
corresponding actions specified in paragraph (f) of this AD.
Parts Installation
(i) As of the effective date of this AD, no person may install a V-band clamp, P/N VC1642A-
2030-A or VC1642A-1875-A, with a manufacturer batch stamp dated before “08-02,” on any
airplane.
Alternative Methods of Compliance (AMOCs)
(j)(1) The Manager, New York ACO, has the authority to approve AMOCs for this AD, if
requested in accordance with the procedures found in 14 CFR 39.19.
(2) Before using any AMOC approved in accordance with § 39.19 on any airplane to which the
AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate
　
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