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HALLOWELL Dan 1920-1959

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Re: HALLOWELL Dan 1920-1959

Posted: 14 Jan 2013 6:46PM GMT
Classification: Query
Dan was son of Daniel Lloyd Hallowell and Helen J. Haggard.
His lineage to the PA immigrant John Hallowell of 1683 is:
(Daniel Lloyd, Daniel, George W., Benjamin F., Benjamin, Samuel, Thomas, John). He and his wife (m. 27 Jun 1942) Rena Winona Downey had 4 children.

Dan grew up in Farmer City, Illinois. He graduated from Moore Township High School and then attended the University of Illinois in Champaign, Illinois. He studied metallurgical engineering. He had always wanted to fly and in his junior year joined the Army Air Corps. He subsequently received his wings and commission. He trained in B-26 (Marauder) Bomber school in Lakeland, Florida. Later, he served as a trainer for B-26 pilots in Berksdale Field, Louisiana. Towards the end of his military service, he flew B-29s and trained other airmen as B-29 pilots.

Dan was ashore in North Africa as soon as the air fields were usable. In Casablanca, he ran into Tom "Junior" McConkey, also from Farmer City who was a pilot in the Army Air Corps. In Dan's tour in the Mediterranean/European Theater, he covered targets in Tunisia, Pantalleria, Sardinia, Sicily, Italy and France. On most of these missions, he was the flight leader, responsible for not only his own plane, but the others also. As flight leader, he was responsible for guiding flights to target and back to base
regardless of ack-ack, fighter attacks and hazardous weather. He had completed forty bombing missions and ten anti-submarine parols by his twenty-third birthday.

In September of 1943, on a mission north of Naples, his plane was damaged, necessitating an emergency landing. He let the crew bail out behind American lines, and then crash landed offshore, near Salerno. During the crash, he received a slight leg injury which earned him a Purple Heart - from crash landing, not from the flack that caused the damage and made the landing necessary.
Dan led the first Air Force mission into southern France in early 1944, with Solon Airfield, outside Marseilles, as the target.
After his hitch in the Mediterranean Theater, Dan had a furlough at home with his wife and then went directly from the relatively small B-26 to the colossal B-29, first as a trainee and later as a trainer of other pilots.

After the war, he became a pilot for Baniff Airlines and lived in Euless, Tarrant County, Texas. He died on a warm and humid night when the Braniff Lockheed L-188A Electra that he was flying crashed at 23:09 CST, killing a crew of six and 28 passengers. The plane disintegrated in flight over East Texas at an altitude of 15000 feet while on an IFR flight-plan (BN flight 542) from Houston to Dallas, Texas. The plane, built in 1959, was Registration N9705. It had only 132 hours of flight time. It had four big turboprops. Parts of the airplane rained down over an area four miles long. Witnesses on the ground described a glow like a meteor -- bright, then fainter, then bright again -- a screaming sound like a jet engine, and a boom.

It was determined that the Electra turboprop experienced structural failure of the left wing generated by "un-dampened propeller whirl mode". This caused the wing to separate and the plane to crash. "Whirl mode" refers to the results of the application of a force to gyroscopic characteristics of a rotating propeller. When such a force is applied, precession occurs; that is, like a gyroscope, the propeller reacts ninety degrees out of phase to the applied force. This causes the structural resistance of the engine mounting system to apply a nose-down pitching moment. This forces the propeller disc (as viewed from the rear) to turn to the left due to precession. This in turn causes a nose-down propeller disc yawing to the right, which causes a nose-up pitch, completing the cycle. This combination of effects results in a direction of rotation opposite to that of the propeller.

In normal aircraft, the whirl mode operates within the limits of the flexibility of the engine mounts. If, however, some structural element of the power plant, the power-plant mounting system, or the nacelle was in a damaged or weakened condition, the whirl mode would not damp out, but could become more violent, increasing damage to the structure, and could approach the natural frequency of the wing. This would perpetuate the whirl mode in a form of induced flutter and lead to catastrophic failure. It was determined that the Electra's fatal flaw was in the three member structure connecting the gearbox and the engine, a paart supplied by the engine manufacturers. When one member of that structure failed, the engine mount became flexible. On an outboard engine, at the Electra's original cruise speed, failure of the strut induced immediate, violent flutter that tore the wing off.

As a result of the findings, Lockheed redesigned the wing structure so that it would not flutter when such a failure occurred. The strut was also redesigned so that it would not fail. In additon, the wing skins were thickened. All Electras were modified at a cost of just under $25 million. Following the crash, Lockheed established LEAP - "Lockheed Electra Action Program"



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[from The Dallas Morning News, 2 Oct 1959]
Euless, TX - Funeral services for Dan Hallowell, 39, co-pilot fo the Braniff Airways plane that crashed near Buffalo Tuesday, will be held at 11 a.m. Friday at the Moore Funeral Chapel in Arlington. The Rev. Glenn O. Hilburn and the Rev. Robert Haynes will officiate. Burial will be in Blue Bonnet Cemetery near Fort Worth.
A pilot with Braniff since 1948, Mr. Hallowell had lived in Euless since 1955. He moved here from Dallas. He was a native of Farmer City, Ill.
He was an Air Force veteran of World War II and was a member of the Methodist Church.
Survivors are his wife: three daughters, Carol Ann, Kathy and Suellen; one son Dan, all of Euless; his father, Daniel L. Hallowell of Vancouver, Wash.; his mother, Mrs. Helen Hallowell of Dallas; two sisters, Mrs. James Gannett of Seattle, Wash., and Miss Martha Hallowell of Dallas, and one brother, Mr. Allen Hallowell of Kelso, Wash.
SubjectAuthorDate Posted
t42Bluebonnet 12 Jan 2013 4:31PM GMT 
Bruce_Hallowe... 15 Jan 2013 1:46AM GMT 
rdowdy71 9 Aug 2014 5:30AM GMT 
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