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Skeptics question value of sending investigators to MH17 site

The National Transportation Safety Board and the Federal Bureau of Investigation are sending investigators to the location where Malaysia Airlines Flight MH17 crashed in eastern Ukraine.

Ordinarily, the presence of investigators at the scene of airline crashes is standard protocol. But in this case, given the circumstances surrounding the crash, aviation experts say it makes little sense to send aviation crash investigators from the U.S. into crash zone.

Debris from Malaysia Airlines Flight 17 is shown smoldering in a field on July 17, 2014, in Grabovo, Ukraine, near the Russian border.
Pierre Crom | Getty Images
Debris from Malaysia Airlines Flight 17 is shown smoldering in a field on July 17, 2014, in Grabovo, Ukraine, near the Russian border.

"I'm very surprised at the fact that the NTSB would send anyone over there under these circumstances," said Greg Feith, a former NTSB aviation investigator.

Read MoreTimeline of MH17 tragedy

Feith said he believes there are substantial risks to sending crash investigators into an area where pro-Russian separatists and Ukrainian soldiers have been fighting. Especially since those investigators are unlikely to find much information that will get to the key question: who fired the surface-to-air missile that brought down MH17.

Read MoreWhy was Malaysia Airlines MH17 flying over Ukraine?

The FBI will be sending two people to assist the investigation, one of them is an explosives expert.

But what about MH17's black box and flight data recorder? Their exact location is unclear. They could yield some information, but critics say both recorders could be of limited value.

"We know what brought the aircraft down, there really is no investigation. This is not the traditional investigation that the NTSB would conduct, where we're looking for a mechanical malfunction or failure of the aircraft, or pilot operation. We know what brought it down," said Feith.

Boeing, which built the 777-200ER said it is standing by and is ready to assist in the investigation.

By CNBC's Phil LeBeau