10 February 1943 where it was initially based at an airfield at Slavyansk-na-Kubani. Due to whether conditions, II. Gruppe then moved to Kerch on 16 February. While based at Slavyansk-na-Kubani, Quast claimed three aerial victories on 11 February including two Polikarpov I-16 fighters. The next day, he shot down an Ilyushin Il-2 ground-attack aircraft followed by four fighters claimed destroyed on 13 February. Operating from Kerch, Quast claimed a I-16 fighter shot down on 25 February and a LaGG-3 fighter the next day followed by a Petlyakov Pe-2 bomber on 5 March. On 13 March, the Gruppe moved to Anapa located on the northern coast of the Black Sea near the Sea of Azov and was fighting in the Battle of the Caucasus. Flying from Anapa, Quast sank a Soviet motor torpedo boat of the Black Sea Fleet in the area of Gelendzhik on 20 April 1943. By end-April 1943, credited with 38 aerial victories, Quast had become the fourth highest scoring active fighter pilot of II. Gruppe of JG 52. At the time, the most successful fighter pilots of the Gruppe were Oberleutnant Heinz Schmidt with 130 aerial victories to date, Oberleutnant Barkhorn with 124 claims to date, followed by Leutnant Helmut Haberda with 49 aerial victories. By the end of May, Quast had moved into third place within II. Gruppe, his number of aerial victories had increased to 52 claims. In June, his number of aerial victories had reached 65 claims. For this, Quast was awarded the Honour Goblet of the Luftwaffe () on 25 June. On 7 August, Quast claimed three aerial victories over Yakovlev Yak-1 fighters on an early morning mission in the vicinity southwest of Novorossiysk. During this aerial combat, his Messerschmitt Bf 109 G-6 (Werknummer 15844—factory number) collided with the debris of his third claim. He bailed out approximately southwest of Novorossiysk over the Black Sea and was taken prisoner of war. During his captivity, he was awarded the Knight's Cross of the Iron Cross () on 31 December 1943 in absentia. The Soviets released him as a prisoner of war in 1949. Later life and death On 12 July 1962, Quast was killed in a flying accident when the Aérospatiale Alouette III light utility helicopter, on which he was riding as a passenger, flew into cable near Mittenwald killing all on board. He is listed on the Ehrenmal der Bundeswehr (Bundeswehr Memorial). Summary