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

Special Conditions: Boeing Model 777 Series Airplanes; Seats With Articulating Seat Backs

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 November 4, 1998 for Boeing. System: cabin, seats and restraints.

What it applies to

Applicant
Boeing
Makes
Boeing
Models
—
Published
November 4, 1998
Effective
December 6, 1998
The FAA's document
On the FAA's site

The FAA's summary their words, unchanged

These special conditions are issued for Boeing Model 777 series airplanes with articulating seat backs. The applicable 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 provided by the existing airworthiness standards.

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