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

Special Conditions: McDonnell Douglas Model MD-900 Helicopter, Critical Functioning Electrical/Electronic Systems

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 December 25, 1991 for Mcdonnell Douglas Helicopters. System: engine.

What it applies to

Applicant
Mcdonnell Douglas Helicopters
Makes
McDonnell Douglas Helicopters
Models
—
Published
December 25, 1991
Effective
January 26, 1992
The FAA's document
On the FAA's site

The FAA's summary their words, unchanged

This special condition is issued for the McDonnell Douglas Model MD-900 helicopter. This helicopter will have a novel or unusual design feature associated with certain engine installations identified as utilizing a Full Authority Digital Engine Control (FADEC). This special conditions contains additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that provided by the applicable airworthiness standards.

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