The Federal Aviation Administration (FAA) recently proposed rules for commercial drone flights, requiring unmanned aircraft pilots to obtain special pilot certificates.

Also, the unmanned aircrafts are to stay away from bystanders, fly only during the day and limits flying speed at 100 miles per hour (160 kph) and the altitude to 500 feet (152 meters) above ground level, reports AgriMarketing.

The long-awaited rules also say pilots must remain in the line of sight of its radio-control drone. This could limit inspection of pipelines, crops and electrical towers, which are major uses pursued by companies.

This rule does not deal with beyond line of sight, but does allow for the use of a visual observer to augment line of sight by the operator of the unmanned aircraft, FAA Administrator Michael Huerta said.

The public may comment on the proposed regulation for 60 days from the date of publication in the Federal Register, which can be found at www.regulations.gov.