The United States' top fighter jet, the Lockheed Martin F-22, has recently required more than 30 hours of maintenance for every hour in the skies, pushing its hourly cost of flying to more than $44,000, a far higher figure than for the warplane it replaces, confidential Pentagon test results show.
The aircraft's radar-absorbing metallic skin is the principal cause of its maintenance troubles, with unexpected shortcomings — such as vulnerability to rain and other abrasion — challenging Air Force and contractor technicians since the mid-1990s, according to Pentagon officials, internal documents and a former engineer.
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