The airship did not receive much in the way of routine inspections even though there was evidence of at least some damage on previous flights. It is not known whether that damage was properly repaired or even whether all the failures had been found. During the ship's first return flight from Rio, "Hindenburg" had once lost an engine and almost drifted over Africa, where it could have crashed. Afterwards, Dr. Eckener ordered section chiefs to inspect the airship during flight. However, the complexity of the airship's structure would make it virtually impossible to detect all weaknesses in the structure. In March 1936, the "Hindenburg" and the "Graf Zeppelin" made three-day flights to drop leaflets and broadcast speeches via loudspeaker. Before the airship's takeoff on March 26, 1936, Ernst Lehmann chose to launch the "Hindenburg" with the wind blowing from behind the airship, instead of into the wind as per standard procedure. During the takeoff, the airship's tail struck the ground, and part of the lower fin was broken. Although that damage was repaired, the force of the impact may have caused internal damage. Only six days before the disaster, it was planned to make the "Hindenburg" have a hook on her hull to carry aircraft, similar to the US Navy's use of the USS "Akron" and the USS "Macon" airships. However, the trials were unsuccessful as the biplane hit the "Hindenburg"s trapeze several times. The structure of the airship may have been further affected by this incident.