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In page De Havilland Mosquito:

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The A&AEE tested the climb and speed of night fighter conversion of MP469 in January 1943 for the Ministry of Aircraft Production.[4] Wingspan had been increased to 62 ft (19 m), the Brownings had been moved to a fairing below the fuselage. According to Birtles, an AI radar was mounted in the nose and the Merlins were upgraded to Mk76 type, although Boscombe Down reported Merlin 61s. In addition to MP469, four more B Mk.IVs were converted into NF MK XVs.[3][5] The Fighter Interception Unit at RAF Ford carried out service trials, March 1943, and then these five aircraft went to 85 Squadron, Hunsdon, where they were flown from April until August of that year. The greatest height reached in service was 44,600 ft (13,600 m).[citation needed]