NTSB Waiting to Inspect Plane in Wichita Airport Crash

PHOTO:In the image from video provided by KAKE News, black smoke billows from a building at Mid-Continent Airport where officials say a plane crashed, Oct. 30, 2014, in Wichita, Kan.PlayKAKE News/AP Photo
WATCH Small Jet Crashes Into a Safety Building, Killing 4 at Airport in Wichita, Kansas

Investigators with the National Transportation Safety Board have been unable to inspect a small plane that crashed into a building at an airport in Wichita, Kansas, killing four people.

Leah Yeager, a senior air safety investigator with the NTSB, said late Thursday investigators will enter the Flight Safety Building at Wichita Mid-Continent Airport after it's deemed structurally sound.

Heavy equipment will arrive today to remove portions of the building, Wichita Fire Chief Ronald Blackwell told The Associated Press.

The twin-engine Beechcraft lost power in one of its engines during takeoff Thursday morning before crashing into the building, according to the Federal Aviation Administration. Its pilot, Mark Goldstein, a former air traffic controller, died.

"I need to declare an emergency. We just lost the left engine," Goldstein told air traffic controllers before the crash.

PHOTO: A small twin engine plane hit a building after losing power in one of its engines soon after taking off from Mid-Continent Airport in Wichita, Kan., Oct. 30, 2014. KAKE
A small twin engine plane hit a building after losing power in one of its engines soon after taking off from Mid-Continent Airport in Wichita, Kan., Oct. 30, 2014.

The three others killed, who were in the building, haven't been identified. Five people were hospitalized, including one person in serious condition. Goldstein was flying solo.

About 100 people were inside the building, which houses Cessna Citation Jet Simulators, when the plane crashed.

"We were on a conference call and the building just kind of shook and rumbled," said Ryan Peterman, who works inside the building. "We saw the fuselage of the aircraft on top of the building on fire."

PHOTO: Jaison Podkanowicz posted this photo to Twitter on Oct. 30, 2014 from Mid Continent Airport, Wichita, Kansas with the caption, plane crashes into building at Mid Continent Airport. Jaison Podkanowicz
Jaison Podkanowicz posted this photo to Twitter on Oct. 30, 2014 from Mid Continent Airport, Wichita, Kansas with the caption, "plane crashes into building at Mid Continent Airport".

Goldstein, who served in the U.S. Navy before joining the FAA in 1987, twice earned the top safety award for his region as an air traffic controller, according to the National Air Traffic Controllers Association. He had recently retired.

"I knew the air traffic control people would know if it was him and sure enough, they knew his voice," said Ron Ryan, a friend of Goldstein.

A 2005 bio provided to ABC News described Goldstein as someone who has “an extensive background in aviation and is considered to be a conscientious controller.” He also volunteered as a youth hockey coach.

ABC News' Matt Hosford, Meghan Keneally and The Associated Press contributed to this report.

Get real-time updates as this story unfolds. To start, just "star" this story in ABC News' phone app. Download ABC News for iPhone here or ABC News for Android here. To be notified about our live weekend digital reports, tap here.