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

Flight; Propulsion

Special conditions are rules the FAA writes for one design when the standard certification rules do not cover something new about it. These were for Bell Helicopter Company. System: other and general.

What it applies to

Applicant
Bell Helicopter Company
Makes
Bell Helicopter Textron, Inc.
Models
—
Effective
August 28, 1969
The FAA's document
On the FAA's site

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