Investigation Summary
The flight departed Kansas City at 09:15 for Wichita on the first leg of a transcontinental journey to Los Angeles. During the flight, the co-pilot radioed that the weather was becoming difficult and expressed an intention to return to Kansas City. Shortly thereafter, at approximately 10:50, witnesses observed the aircraft emerge from low clouds with one wing detached. The investigation was hampered by souvenir hunters who stripped the wreckage before officials arrived, but technical analysis eventually focused on the Fokker's wooden wing construction. The wings were built with a plywood skin over wooden spars; moisture trapped inside the wing had caused the casein glue to rot, weakening the bond between the spar and the ribs. Under the stress of turbulence or maneuvers in poor visibility, the weakened spar failed, leading to aeroelastic flutter and catastrophic structural separation. The public outcry following Rockne's death was so intense that the Department of Commerce was forced to abandon its policy of keeping accident reports secret. Although a formal investigation was conducted, the full official report was famously withheld from the public for years, marking the birth of public transparency in aviation safety only after significant political pressure.
Final Conclusions
The probable cause was the structural failure of the right wing due to the deterioration of the internal wooden spar. Moisture ingress had weakened the glue joints within the wing's laminate structure, rendering it unable to withstand the aerodynamic loads encountered during the flight. The accident led to the temporary grounding of all Fokker F.10s and accelerated the industry-wide transition to all-metal airframes.
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Systems & Failure Modes
Wooden Laminate Wing
The Fokker F.10 used a wing constructed of wooden spars and ribs covered in plywood. The structure relied on casein glue, which was prone to degradation if moisture penetrated the wing's interior.
Aeronautics Branch Investigation
The predecessor to the FAA, which at the time of the crash did not publicly release accident reports, a policy changed by the public outcry following this event.
Interesting Facts
- 01The crash killed Knute Rockne, the famous head coach of the Notre Dame football team.
- 02The six passengers killed were Knute Rockne, H. J. Christen, John Happer, Waldo B. Miller, Spencer Goldthwaite, and G. A. Robrecht.
- 03The Fokker F.10 featured a wooden wing design that was susceptible to internal rot from moisture.
- 04This accident ended the Department of Commerce's policy of keeping crash investigation results secret.
- 05The disaster is credited with accelerating the development of the Douglas DC-1 and DC-2 all-metal airliners.
- 06Souvenir hunters removed significant portions of the wreckage, including parts of the fuselage, before the official investigation began.
Safety Actions & Advisories
Grounding of Fokker Trimotors
The Department of Commerce temporarily grounded all Fokker F.10s in U.S. service and mandated more frequent, rigorous inspections of wooden wing structures.
Public Disclosure of Accident Reports
The investigation established the precedent for the U.S. government to provide objective, public reviews of aircraft accidents.
Transition to All-Metal Construction
The airline industry moved away from wood-framed aircraft in favor of all-metal designs like the Boeing 247 and Douglas DC-2 to prevent similar structural failures.