CF6-80 series Catastrophic Failures
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CF6-80 series Catastrophic Failures
From a Safety Recommendation Letter, A-06-60 Through –64, August 28, 2006 to the FAA. The NTSB called for increased recurring inspections of CF6-80s Inconel High Pressure Turbine stage 1 disks to every 3,000 cycles. 3 on-wing incidents were cited.
6/2/2006. American 767ER; ground run for power lag write-up, CF6-80A exploded at 95 % N1. Damage; engine split in-two, fuselage penetration, complete severing of left keel member, partial severing of the right, holing of the wing fuel tank, fire damage to wing and fuselage. Cause; fatigue fractures, blade slot bottoms.
12/8/2002. Air New Zealand 767ER, CF6-80A exploded in climb. Damage; engine and wing leading edge. Australian Transport Safety Board # 200205780. Cause; radial fatigue crack at the turbine blade slot, one of three similar cracks that were found during the subsequent investigation.
Source; http:/www.atsb.gov.au/publications/investigation reports/2002/AAIR/aair200205780.aspx
9/22/2000. U.S. Air 767ER, ground run - leak check. CF6-80C2B2 exploded at 93 % N1. Damage; engine split in two - joined only by fan mid shaft, fuel tank penetrated, fire, lower half of forward wing spar cut . Cause; intergranular fatigue.
Prior Histories; 3 ‘routine inspections’ of cracks found back to 1996.
9 other such incidents were NOT in this Letter. Two from NTSB Letter A-98-125-126, and one from NTSB Accident/Incident Report LAXl91IA376 from 1991. All uncontained and without cause.
6 Service Difficulty Reports of in-flight shutdowns ( just 14 months) due to seized, vibrations, etc. All without follow-up or cause and no NTSB Records or Investigation. Operator Control #s AALA20020257 > DL764011244 > 01FDEA00042 > CA000518004 > DL767000263 and CA00011001.
Source; FAA Database source > Service Difficulty Report Query Page
6/2/2006. American 767ER; ground run for power lag write-up, CF6-80A exploded at 95 % N1. Damage; engine split in-two, fuselage penetration, complete severing of left keel member, partial severing of the right, holing of the wing fuel tank, fire damage to wing and fuselage. Cause; fatigue fractures, blade slot bottoms.
12/8/2002. Air New Zealand 767ER, CF6-80A exploded in climb. Damage; engine and wing leading edge. Australian Transport Safety Board # 200205780. Cause; radial fatigue crack at the turbine blade slot, one of three similar cracks that were found during the subsequent investigation.
Source; http:/www.atsb.gov.au/publications/investigation reports/2002/AAIR/aair200205780.aspx
9/22/2000. U.S. Air 767ER, ground run - leak check. CF6-80C2B2 exploded at 93 % N1. Damage; engine split in two - joined only by fan mid shaft, fuel tank penetrated, fire, lower half of forward wing spar cut . Cause; intergranular fatigue.
Prior Histories; 3 ‘routine inspections’ of cracks found back to 1996.
9 other such incidents were NOT in this Letter. Two from NTSB Letter A-98-125-126, and one from NTSB Accident/Incident Report LAXl91IA376 from 1991. All uncontained and without cause.
6 Service Difficulty Reports of in-flight shutdowns ( just 14 months) due to seized, vibrations, etc. All without follow-up or cause and no NTSB Records or Investigation. Operator Control #s AALA20020257 > DL764011244 > 01FDEA00042 > CA000518004 > DL767000263 and CA00011001.
Source; FAA Database source > Service Difficulty Report Query Page
