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

Special Conditions; Sikorsky S-58T Helicopter

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 Sikorsky. System: other and general.

What it applies to

Applicant
Sikorsky
Makes
Sikorsky
Models
—
Effective
April 13, 1971
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.