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

Special Conditions: Boeing Model 747-8/-8F Airplanes, Structural Design Requirements for Four-Post Main Landing Gear System

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 October 7, 2009 for Boeing. System: landing gear.

What it applies to

Applicant
Boeing
Makes
Boeing
Models
—
Published
October 7, 2009
Effective
November 8, 2009
The FAA's document
On the FAA's site

The FAA's summary their words, unchanged

These special conditions are issued for the Boeing Model 747- 8/-8F airplane. This airplane will have novel or unusual design features associated with a four-post main landing gear system. 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.