scope:

This specification covers the general requirements for inverters which convert electrical power in aircraft from nominal 28 Volts DC (see 6.4.2) power to three-phase or single-phase AC (see 6.4.1) power at 400 Hertz.

Inverters shall be of the following classes, as specified (see 3.7.2.1 and 6.2):

Class A. Inverters which are self-cooled and designed to meet the temperature-altitude requirements of Standard MS33543, curve II. Class B. Inverters which are self-cooled and designed to meet the temperature-altitude requirements of Standard MS33543, curve I, except that the ambient temperature shall not exceed +85°C. The inverter shall deliver rated output up to 50,000 feet and 50 percent (minimum) rated power up to 65,000 feet. Class C. Inverters which are blast-cooled and designed to meet the temperature-altitude requirements of Standard MS33542.

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Air Warfare Center Aircraft Division, Electrical Systems Department (SY60), Patuxent River, MD 20670-5304, by using the self-addressed Standardization Document Proposal (DD Form 1426) appearing at the end of this document or by letter.

intended Use: