Airworthiness Directive · Amendment 39-17157 · Power plant
Bombardier, Inc. Airplanes
This AD applies to Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes; certificated in any category; serial numbers 4001, 4003 through 4354 inclusive; and 4356 through 4363 inclusive.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400 series airplanes. This AD was prompted by chafing on high pressure fuel lines due to improper installation of an expandable pin on the lower cowl assembly. This AD requires installing spring clips and repositioning the lanyard attachment points at the forward end and the forward firefloor of the lower cowl. We are issuing this AD to prevent chafing of the high pressure fuel lines, which if not corrected, could cause fuel leakage in a fire zone.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 6,000 flight hours or 36 months after the effective date of this AD, whichever occurs first, install new or serviceable spring clips and re-position the lanyard attachment points, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-71-13, dated May 19, 2011.
