R101 Despite the lack of full endurance and speed trials and the fact that a proper investigation of the aerodynamic consequences of the extension had not been fully completed by the N.P.L., a Certificate of Airworthiness was issued on 2 October, the Inspectorate expressing their complete satisfaction with the condition of the R101 and the standards to which the remedial work had been carried out. The actual certificate was handed over to H. C. Irwin, the ship's captain, only on the day of her flight to India. R101 departed from Cardington on the evening of 4 October 1930 for its intended
R101 her directly over the Beauvais Ridge, an area notorious for turbulent wind conditions. At 02:00 the watch was changed, Second Officer Maurice Steff taking over the command from Irwin. The R101 was at this point "flying heavy", relying on dynamic lift generated by forward airspeed to maintain altitude, estimated by the Board of Inquiry as at least above the ground. At about 02:07 R101 went into a dive from which she slowly recovered, probably losing around . As it did so Rigger S. Church, who was returning to the crew quarters to come off duty, was sent forward to release