By Andrea Shalal-Esa

WASHINGTON, Oct 31 (Reuters) - The U.S. Navy on Thursday canceled a notice about a possible order of up to 36 more Boeing Co F/A-18 fighter jets or EA-18G electronic warfare planes after the posting on a federal procurement website sparked confusion this week.

The pre-solicitation notice, which first became public this week, had triggered renewed questions about the Navy's commitment to the $392 billion radar-evading F-35 Joint Strike Fighter program by Lockheed Martin Corp.

Boeing has sought for years to sell the Navy more of its F/A-18E/F Super Hornets for use on aircraft carriers, as a hedge in case the more capable carrier variant of the F-35 fighter jet runs into further delays or technical challenges.

Navy officials this week said they had no plans to buy more Super Hornets or EA-18G Growlers in fiscal 2015 despite the notice on a federal procurement website. They said the notice was meant to ensure the "proper acquisition process" was in place if more U.S. or foreign orders materialized.

But the posting caught Pentagon officials by surprise, since the current Navy budget calls for F/A-18 funding to end in fiscal 2014, with production of the planes to end in 2016.

It was not immediately clear why Naval Air Systems Command, or Navair, decided to cancel the notice, which was first posted Oct. 17. The procurement website was updated on Thursday to say the notice had been canceled, but no explanation was provided.

Officials with Navair, which oversees aviation programs such as the F/A-18, could not be reached for comment.

One U.S. official said the episode underscored the Navy's tepid commitment to the single-engine F-35 and the continuing attachment of many naval aviators to the Super Hornet, which has two engines.

"There is a desire at pretty significant levels in the Navy to keep the Super Hornet line alive," said the source, who was not authorized to speak publicly.

Lockheed is developing three models of the new warplane for the U.S. military and eight partner countries: Britain, Canada, Turkey, Italy, Norway, Australia, Denmark and the Netherlands. Israel and Japan have also placed orders.

The U.S. Marine Corps will be first service to start using the new radar-evading warplanes from mid-2015. The Air Force will follow a year later.

The Navy will be the last U.S. military service to start using its F-35 variant in 2019.

YOUNG FIGHTER FLEET

Unlike the other services, the Navy's current fleet of fighter jets is relatively young, bolstered by repeated increases in F/A-18 and EA-18G procurement in recent years, including many planes added to the Navy budget by lawmakers.