Investigation Summary
The flight departed London Gatwick at 20:43 UTC on October 6, 1961. After reporting overhead Toulouse at 00:30 UTC at Flight Level 75, the crew estimated arrival at Perpignan for 01:12 UTC. However, the aircraft deviated from its intended track and struck the Canigó massif at an altitude of 7,500 feet (2,200 m). The French inquiry noted that the aircraft was flying below the safety altitude specified in the Derby Aviation operations manual for the Toulouse to Perpignan route. A significant factor was the lack of uniformity in the charts available to the crew, which could lead to different safety altitude calculations. Furthermore, the airline had not standardized which charts pilots should use for these calculations. The investigation also found that the crew likely relied on dead reckoning. A forecast wind from the starboard side (240° at 25 knots) would have required a 10-degree correction to port; however, the actual wind was likely from the WNW (290° at 25 knots), which would have resulted in no drift. If the crew applied a correction for a non-existent drift, it would have placed them on the fatal track toward the mountain.
Final Conclusions
The official inquiry concluded that the accident was caused by a navigational error, the origin of which could not be determined. Contributing factors included the flight being conducted below the minimum safety altitude and a flight plan that failed to meet French requirements for reporting airway crossings and flight information region boundaries. The commission noted that while a reconstruction involving wind drift and dead reckoning offered a plausible explanation for the track deviation, the lack of a flight recorder prevented a definitive finding.
Video Analysis
1961 Derby Airways Aviation crash Aftermath Footage — Historical footage showing the wreckage of the Derby Aviation Douglas Dakota IV on Mount Canigó and the subsequent recovery efforts.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Crew Experience
Captain
Had landed at Perpignan twice in the preceding six months.
First Officer
Had made five landings at Perpignan in the previous six months.
Systems & Failure Modes
Radio Compass
A navigational aid used to determine bearings from radio beacons; the inquiry suggested the crew likely relied on dead reckoning instead of this system.
Safety Altitude Calculations
The method for determining the minimum safe flying height; the airline's manual provided a formula, but inconsistent charts made uniform application difficult.
Interesting Facts
- 01The aircraft was a Douglas Dakota IV built in 1944, construction number 16171.
- 02The aircraft originally served with the USAAF under the serial number 44-76587.
- 03The crash site was located at an altitude of 7,500 feet (2,200 m) on Pic de Canigó.
- 04The flight plan filed by the crew did not comply with French IFR regulations.
- 05Mount Canigó was the site of at least nine major air crashes between 1949 and 1967.
- 06The investigation found no evidence of exceptional meteorological phenomena, though cloud cover was heavy.
Safety Actions & Advisories
Special Review of British Operators
Following this and subsequent crashes in the Perpignan area, the President of the Board of Trade ordered a special review of the performance of all British-registered civil aircraft operators.
Known Controversies & Unanswered Questions
Magnetic Interference Theory
Early speculation suggested that magnetic fields from local iron mines might have disrupted the aircraft's compasses, though this was not supported by the official inquiry findings.