United Air Lines Flight 624

United Airlines Flight 624

Chicago Municipal Airport
Destination	LaGuardia Airport, New York City
Occupants	43
Passengers	39
Crew	4
Fatalities	43
Survivors	0

United Airlines Flight 624, a

, resulting in the deaths of all four crew members and 39 passengers on board. The crew had been responding to a false signal of a fire in the front cargo hold by releasing CO₂, apparently without opening the pressure relief valves. The part-incapacitated crew began an emergency descent and hit a high-voltage power line.

Accident sequence

Flight 624 from San Diego had just completed a routine initial descent as part of its approach into the New York area, when the forward cargo hold fire indicator light illuminated, leading the flight crew to believe a fire was in that cargo hold. Although this later turned out to be a false alarm, the crew decided to discharge CO₂ bottles into the forward cargo hold, to try to extinguish the possible fire.

While proper operating procedure called for opening the cabin pressure relief valves prior to discharging the CO₂ bottles, to allow for venting of the CO₂ gas buildup in the cabin and cockpit, no evidence was found of the crew opening the relief valves. Consequently, the released CO₂ gas seeped back into the cockpit from the front cargo hold and apparently partially incapacitated the flight crew. The crew then put the aircraft into an emergency descent, and as it descended lower, it hit a high-voltage power line, bursting into flames, then smashing through the trees of a wooded hillside.^[1]

Ed Darlington of radio station WCNR at nearby Bloomsburg said, "there was no sign of life and apparently everyone was killed." The scene of the wreck was in a sparsely wooded area about five miles from Mount Carmel, Pennsylvania, a small town 135 miles from Philadelphia, where delegates are gathering for the Republican National Convention. News of the crash brought excited whispering from the delegates. No one knew for certain whether any high-ranking Republican officials were on the plane.

Ira F. Roadarmel of Mount Carmel, one of the first persons on the scene, said, "everything was scattered. The largest piece of the plane left was an engine. The rest of the plane was in small parts — so small they could be carried."

George Minnich, an employee of Midvalley Colliery No. 2, which the plane missed by only 100 yards in its descent, said that he saw the plane bank. "Suddenly, there was a horrible crash," he said. "All you could see was a mass of flames. It sounded as though the end of the world was coming."^[2]

The plane's logbook, found near the scene of the crash in a thickly wooded area, identified the plane's pilot as Captain George Warner.

— The Sheboygan Press, June 17, 1948.

Notable victims

Among the passengers were

.

Investigation and final report

The

increased sharply. The airplane then crashed in a power line clearing on wooded hillside at an elevation of 1,649 feet. The airplane struck a 66,000-volt transformer, severed power lines, and burst into flames.

Investigation revealed that the fire warning in the cargo compartment had been false.

— CAB File No. 1-0075-48

The CAB concluded with the following probable cause for the accident: "The Board determines that the probable cause of this accident was the incapacitation of the crew by a concentration of CO₂ gas in the cockpit."

See also

• Centralia, Pennsylvania
• List of accidents and incidents involving commercial aircraft
• TWA Flight 513
• United Airlines Flight 608

References

External links

• Final Report - Civil Aeronautics Board - PDF
• "United 624 Crash in Wilburton, PA June 17, 1948". Anthracite Coal Region. Retrieved 2019-11-27.