The site, normally publicly available, was not accepting visitors today, four days after officials removed the full names and Social Security numbers of aviators and air crew at http://www.safetycenter.navy.mil.
In addition, the same confidential data was saved on 1,083 web-enabled safety system program disks that were mailed to Navy and Marine Corps command center.
Evelyn Odango, a Naval Safety Center spokeswoman, said the information was posted due to a programming error made during the creation of an application for the website last December. The program reported aviator mishaps.
The Navy was working to notify in writing all affected individuals, who include active and reserve aviators who have served in the past 20 years, the statement said. The Navy also established a call center, available to answer questions, at (866) 827-5672.
Last month, the personal data of about 28,000 Navy sailors and their family members were discovered on a civilian website. It is unclear how the information got on that site.
In both cases, officials do not believe any of the data has been used illegally.
Both incidents follow the massive breach in which the personal information of some 26.5 million veterans and current military members was compromised following the theft of a laptop from the home of a former Department of Veterans Affairs employee.