The U.S. aircraft register, updated daily
Special conditions · aircraft

Special Conditions: Bombardier Aerospace, Models BD-500-1A10 and BD-500-1A11 Series Airplanes; Tire Debris Impacts to Fuel Tanks

Special conditions are rules the FAA writes for one design when the standard certification rules do not cover something new about it. These were published September 11, 2014 for Bombardier. System: landing gear.

What it applies to

Applicant
Bombardier
Makes
Bombardier
Models
—
Published
September 11, 2014
Effective
October 13, 2014
The FAA's document
On the FAA's site

The FAA's summary their words, unchanged

These special conditions are issued for the Bombardier Aerospace, Models BD-500-1A10 and BD-500-1A11 series airplanes. These airplanes will have a novel or unusual design feature associated with the use of carbon fiber reinforced plastic (CFRP) for most of the wing fuel tank structure, which, when impacted by tire debris, may resist penetration or rupture differently from aluminum wing skins. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

Source: FAA special conditions (final) from the Dynamic Regulatory System; the Federal Register carries the same notices.