Born on 6 April 1917 at Tupadly near Wldyslawowo (Gdansk region). In 1937-1938 he underwent flying training during his military service in the 4th Air Regiment in Torun. He stayed on in the regiment, as a career NCO.
In September 1939 he fought with the 141st Fighter Flight, which was part of the III/4 Fighter Squadron of the Pomorze' Army aviation. Subsequently via Rumania went to France. He went to Britain in one of the first groups of Polish airmen. He received service no. 780836. On 2 September 1940 he was posted to No. 238 Squadron RAF. On 5 November 1940, he was shot down in Hurricane I V7535 by a Bf 109 over Bournemouth, he bailed out, but suffered wounds which kept him off flying for several months. In mid-February 1941, still durign his convalescence, he was posted do No. 306 Squadron, but he did not resume flying until March. He was commissionned on 1 November 1941 for his wartime achievements (receiving an officers service no. P-1654). On 2 December 1941 he was posted to No. 58 Operational Training Unit at Grangemouth, where he was an instructor until the end of May 1942. On 29 May 1942 he resumed operational flying with No. 306 Squadron. On 24 May 1943 he was reposted do No. 308 Squadron, and on 11 August 1943 he was appointed the 'A' Flight commander in No. 316 Squadron. Between December 1943 and March 1944 he was posted to No. 18 Armament Practice Camp as a rest from operations. On 30 March 1944 was appointed the 'B' Flight commander in No. 308 Squadron. On 21 May 1944 his Spitfire IX ML254 ZF-V was shot down during a combat sortie. He evaded capture and in September 1944 he returned to Britain. On 24 November 1944 he rejoined his old No. 306 Squadron, where on 6 December he was appointed the 'A' Flight commander. On 13 April 1945 he was injured in a taxiing accident in North American Mustang III KH506. From 25 May 1945 until April 1946 he commanded No. 306 Squadron. Thus he was the second (after Antoni Glowacki) commander of a Polish fighter squadron who had been a career NCO on 1 September 1939. In January 1947 he was released from the Polish Air Force, he stayed w Britain. He volunteered for plane to drop a Polish pilot in the communist-controlled Poland to hi-jack a MiG-15 and flyi it to the West (the plan was abandoned after a pilot of the Soviet- controlled Polish Air Force defected in such an aircraft across the Baltic sea). Subsequently Jeka joined an American air service run by the CIA for clandestine operations in various parts of the world. According to unconfirmed data, during 1940s/1950s he flew over Poland, among other places. He was killed on 15 April 1958, flying a Douglas B-26 during the civil war in Indonesia. According to his wish, he was buried at the Polish airmen cemetery at Newark, Nottinghamshire.
His decorations included
the Silver Cross of Virtuti Militari (no. 09166),
the Cross of Valour and three bars, the
Silver Cross of Merit with Swords,
the Distinguished Flying Medal.