However it was stipulated that an acceptance flight lasting 24 hours would have to be completed before any airship could be bought by the Government: realising that LZ 3 was incapable of meeting this requirement, work was started on the LZ 4.
然而，規定要求在政府購買任何飛船前必須進行24小時的接收飛行，在意識到LZ 3無法滿足這個要求後，LZ 4開始投入建造。