Airworthiness Directive · Amendment 39-14257 · Bombardier Model DHC-8-400 Series Airplanes
Bombardier Model DHC-8-400 Series Airplanes
This AD applies to Bombardier Model DHC-8-400 series airplanes, serial numbers 4003 through 4089 inclusive, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model DHC-8-400 series airplanes. This AD requires a one-time inspection of the fuel and hydraulic tubes, and corrective actions if necessary. This AD also requires modifying fairlead plate assemblies. This AD results from reports of chafing between fuel and hydraulic tubes and the fairlead plate where the tubes pass through the firewall. We are issuing this AD to prevent chafing of the fuel and hydraulic tubes, which could lead to fuel and/or hydraulic fluid leakage in the engine nacelle area and consequent fire or explosion.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
The term “service bulletin,” as used in this AD, means the Accomplishment Instructions of Bombardier Service Bulletin 84-54-09, Revision “B,” dated June 15, 2004.
For airplanes on which Bombardier Systems Drawings (SYD) 84-28-002 and SYD 84-29-006 have not been incorporated or on which Modsum 4-184081 and Modsum 4-184079 have not been incorporated: Within 500 flight hours after the effective date of this AD, do the actions specified in paragraph (i) of this AD.
(h) For airplanes on which Bombardier SYD 84-28-002 and SYD 84-29-006 have been incorporated or on which Modsum 4-184081 and Modsum 4-184079 have been incorporated: Within 4,000 flight hours after the effective date of this AD, do the actions specified in paragraph (i) of this AD.
(i) For airplanes identified in paragraphs (g) and (h) of this AD at the times specified in paragraphs (g) and (h) of this AD, do the actions specified in paragraphs (i)(1) and (i)(2) of this AD in accordance with the service bulletin.
(1) Do a general visual inspection of the fuel/hydraulic tubes for nicks, dents, chafing, or damage. If any nick, dent, chafing, or damage is found that is above the applicable limit specified as “Acceptable” in the service bulletin: Do the applicable corrective action in accordance with the service bulletin at the applicable time specified in the service bulletin.
Note 1: For the purposes of this AD, a general visual inspection is: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.”
(2) Modify the fairlead plate assemblies in accordance with the service bulletin.
Note 2: Bombardier Service Bulletin 84-54-09, Revision “B,” dated June 15, 2004, refers to GKN Aerospace Services Service Bulletin 1-71-20, dated April 7, 2004, as an additional source of service information for modifying the fairlead plate assemblies. The GKN service bulletin is included in the Bombardier service bulletin.
Actions done before the effective date of this AD in accordance with Bombardier Service Bulletin 84-54-09, dated January 23, 2004; or Revision “A,” dated April 22, 2004; are acceptable for compliance with the corresponding requirements of this AD.
After the effective date of this AD, no person may install a plate, part number 85415048-107, 85415048-108, 85415087-107, or 85415087-108, on any airplane.
