NLR rapport TR 80065 C d.d. juni 1980. Continued investigation into the failure of J-85 diffuser casings. NLR rapport TR 80079 C d.d. juni 1980. Investigation into the mechanical properties of the electron beam weld in J-85 diffuser casings. TD-231 NLR rapport TR 80090 C d.d. september 1980. Investigation concerning cracks in the air inlet duct internal skin of NF-5 aircraft. NLR rapport TR 80093 C d.d. september 1980. Investigation into the failure of an arresting hook of an NF-5A. NLR rapport TR 80101 C d.d. 21-10-1980. Acceleration measurements on NF-5A and NF-5B aircraft of the RNLAF. Recording period: January 1980 upto June 1980. NLR rapport Memorandum SM-80-111 d.d. 10-11-1980. Results of a preliminary battle damage repair investigation using composite patches. NLR rapport Memorandum SC-80-122 d.d. 19-11-1980. Verslag van een bezoek aan het Central Servicing Develpoment Establishment (CSDE) van de Royal Air Force, Swanton Morley, op … NLR rapport Memorandum SL-81-006 d.d. januari 1981. Ontwikkeling van een inspectieprocedure voor een rompspant door de huid van het vliegtuig heen. TD-237 NLR rapport Memorandum VV-81-027 C d.d. 21 augustus 1981. Temperature distribution calculations for the NF-5 engine air intake with activated anti-icing system. NLR rapport Memorandum SL-81-048 C d.d. 31-03-1981. Wervelstroominspectie van de "Canted Formers" (STA 478.22) van de vliegtuigen K-3039 en K-3051. NLR rapport TR 81093 C d.d. juni 1981. Acceleration measurements on NF-5A and NF-5B aircraft of the RNLAF. Recording period: January upto December 1980. NLR rapport TR 81103 C d.d. 1-8-1981. Description of a model for taxi rsponse calculations of the NF-5A-aircraft.