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1.5 Crew Information
Captain Oliver E. Sabatke, 41, held airline transport pilot certificate No. 479853 with ratings in DC-3, DC-3S, DC-6/7, Lockheed Constellation, and Vickers Viscount. His last Viscount proficiency training was completed June 30, 1964, in the Viscount simulator. His last physical examination was completed April 4, 1964, with no limitations. His original checkout in Viscount aircraft was May 18, 1957. Captain Sabatke had a 24-hour off duty period prior to his first flight on July 9, 1964, and had been on duty 6:19 hours at the time of the accident.
First Officer Charles L. Young, 37, held airline transport pilot certificate No. 721324 with a Vickers Viscount rating. He passed a first officer's proficiency check in the Viscount February 7, 1964, and his last en route check July 7, 1964. His last physical examination was completed January 14, 1964, with a limitation attached that "Holder shall wear correcting glasses while exercising the privileges of his airman certificate." He had a total of 7,715 hours flying time including 2,100 hours in Viscounts, and had passed a type rating check in the Viscount February 14, 1963. He had a 25-hour rest period before reporting for duty July 9, 1964, and had been on duty 6:19 hours at the time of the accident.
Stewardess Carole L. Berndt, 21, was employed by United Air Lines, Inc., February 14, 1963. She had completed her last recurrent training May 12, 1964, and had 14:08 hours rest period before the flight.
Stewardess Virginia K. Vollmer, 22, was employed by United Air Lines, Inc., March 11, 1964, and completed her last competency check April 20, 1964. She had an 18:04-hour rest period prior to this flight.
1.6 Aircraft Information
N7405, a Vickers Viscount 745D manufactured November 14, 1955, with manufacturer's serial No. 103, was owned by United Air Lines, Inc. The airframe had flown 23,804 hours and had undergone a numbered inspection (#2) 180 hours before the accident. The aircraft received a preflight check six hours before the accident and was given an en route preflight inspection just prior to takeoff from Washington.
The aircraft was powered by four Rolls Royce model Dart 510 engines equipped with ROTOL Ltd. propellers model R130/4-20-4/12E with RA 25842 blades installed. Total times of engines and propeller hubs were:
| Engine No. | Total Time (TT) | Time Since Overhaul (TSO) |
| 1 | 19,003:18 | 2,491:30 |
| 2 | 17,817:29 | 3,718:05 |
| 3 | 17,689:59 | 3,585:08 |
| 4 | 19,525:30 | 2,438:23 |
| Propeller No. | Total Time (TT) | Time Since Overhaul (TSO) |
| 1 | 19,005:27 | 2,437:30 |
| 2 | 2,896:32 | 2,896:32 |
| 3 | 19,333:06 | 1,003:45 |
| 4 | 21,137:37 | 2,438:23 |
