L
- ladder truck
- lading
- land and hold short operation
- land glider
- landing
- landing area
- landing decision point
- landing direction indicator
- landing distance
- landing distance available
- landing distance available (helicopter)
- landing distance required (helicopter)
- landing flare
- landing gear
- landing gear doors
- landing surface
- landing threshold
- landing threshold point
- landing weight
- landplane
- landside operations
- lap joint
- lapse rate
- large aeroplane
- laser-beam critical flight zone
- laser-beam free flight zone
- laser-beam sensitive flight zone
- last-minute change
- lateral deviation
- lateral navigation
- lateral reference noise measurement point
- lateral vibration
- latitude
- lavatory smoke detection system
- layer
- lazy eight
- lead-in line
- lead-out line
- leak check
- leased aircraft
- left-handed propeller
- letter of approval
- level
- Licensing Authority
- life raft
- lifesaving equipment
- lift
- lift-off
- lift-off speed
- lift-to-drag ratio
- lift coefficient
- lift web
- lifting equipment
- light-sport aircraft
- lighter-than-air aircraft
- lighting system reliability
- lima
- limit load
- line maintenance
- line of sight
- line oriented flight training
- line replaceable unit
- liner
- litre
- load classification number
- load factor
- load meter
- load ring
- load sheet
- local mean time
- local runway safety team
- local traffic
- local traffic regulations
- localizer
- location indicator
- logbook
- long-haul flight
- long approach
- longeron
- longitude
- longitudinal axis
- longitudinal stability
- longitudinal trim
- loop
- loss of control in flight
- loss of tail rotor effectiveness
- low-wing monoplane
- low cloud base
- low flight
- low frequency
- low pass
- low visibility procedures
- low visibility take-off
- luggage
- lumen