09/30/2009. Remarks by Johan Visschedijk: "Conceived in June 1944 (the same month that the Spiteful entered flight test) and mating that fighter's laminar-flow wing with a new fuselage and tail, the Type 392 was powered by the new Rolls-Royce RB.41 turbojet which was to enter production as the Nene. Three prototypes were ordered September 9, 1944 of which two were to be navalized.

The first prototype (s/n TS409) was covered by Specification E.10/44 and flew on July 27, 1946, powered by the 4,300 lb (1,950 kg) st Nene. The two navalized prototypes (s/n TS413 and TS416, the first of which was flown on June 17, 1947) were covered by Specification E.1/45, and were fitted with the 5,100 lb (2,313 kg) st Nene 3.

TS409 was later navalized, while TS413 was lost in a crash in June 1948, killing the Royal Navy pilot, Lieutenant T.J.A. King-Joyce. The type was named Attacker and 182 production aircraft Type 398 Attacker were produced:

45 F.Mk.1 and 17 FB.Mk.1 to RN (s/n WA469-WA535, WT851)
84 FB.Mk.2 to RN (s/n WK319-WK342, WP275-WP304, WZ273-WZ302)
36 "de-navalized" aircraft to Pakistan AF, s/n R4000 to R4035."