Accident Type

• 0 HAIL DAMAGE TO AIRCRAFT
• 1 LIGHTNING STRIKE
• 2 EVASIVE MANEUVER
• 3 UNCONTROLLED ALTITUDE DEVIATIONS
• 4 DITCHING
• 5 MISSING AIRCRAFT,NOT RECOVERED
• 6 MISCELLANEOUS
• 7 UNDETERMINED
• A GROUND-WATER LOOP-SWERVE
• B DRAGGED WINGTIP,POD,OR FLOAT
• C WHEELS-UP
• D WHEELS-DOWN LANDING IN WATER
• E GEAR COLLAPSED
• F GEAR RETRACTED
• G HARD LANDING
• H NOSE OVER/DOWN
• I ROLL OVER
• J OVERSHOOT
• K UNDERSHOOT
• L COLLISION WITH AIRCRAFT
• L0 COLLISION WITH AIRCRAFT - BOTH IN FLIGHT
• L1 COLLISION WITH AIRCRAFT - ONE AIRBORNE
• L2 COLLISION WITH AIRCRAFT - BOTH ON GROUND
• M COLLISION WITH GROUND/WATER
• M0 CONTROLLED COLLISION WITH GROUND/WATER
• M1 UNCONTROLLED COLLISION WITH GROUND/WATER
• N COLLIDED WITH UNSPECIFIED OBJECT
• N0 COLLIDED WITH WIRES/POLES
• N1 COLLIDED WITH TREES
• N2 COLLIDED WITH RESIDENCE(S)
• N3 COLLIDED WITH BUILDING(S)
• N4 COLLIDED WITH FENCE,FENCEPOSTS
• N5 COLLIDED WITH ELECTRONIC TOWERS
• N6 COLLIDED WITH RUNWAY OR APPROACH LIGHTS
• N7 COLLIDED WITH AIRPORT HAZARD
• N8 COLLIDED WITH ANIMALS
• N9 COLLIDED WITH CROP
• NA COLLIDED WITH FLAGMAN,LOADER
• NB COLLIDED WITH DITCHES
• NC COLLIDED WITH SNOWBANK
• ND COLLIDED WITH PARKED AIRCRAFT
• NE COLLIDED WITH AUTOMOBILE
• NF COLLIDED WITH DIRT BANK
• NY COLLIDED WITH OBJECT
• P BIRD STRIKE
• Q STALL
• Q1 STALL/SPIN
• Q2 STALL/SPIRAL
• Q3 STALL/MUSH
• R FIRE OR EXPLOSION
• R0 FIRE OR EXPLOSION IN FLIGHT
• R1 FIRE OR EXPLOSION ON GROUND
• S AIRFRAME FAILURE
• S0 AIRFRAME FAILURE IN FLIGHT
• S1 AIRFRAME FAILURE ON GROUND
• T ENGINE TEARAWAY
• U ENGINE FAILURE OR MALFUNCTION
• V PROPELLER/ROTOR FAILURE
• V1 PROPELLER FAILURE
• V2 TAIL ROTOR FAILURE
• V3 MAIN ROTOR FAILURE
• W PROPELLER/ROTOR ACCIDENT TO PERSON
• X JET INTAKE/EXHAUST ACCIDENT TO PERSON
• Y PROPELLER/JET/ROTOR BLAST
• Z TURBULENCE

Source

Codes verbatim from the ct_Pre1982 table of PRE1982.MDB — the FAA-distributed pre-1982 NTSB aviation accident database. Used internally by the Atlas to decode legacy accident records on every pre-1982 NTSB event page.