L
- lack of effective implementation
- lack of fuel
- lading
- land and hold short operation
- land glider
- land gyroplane
- land helicopter
- land ornithoper
- land side
- land side operations
- landing
- landing area
- landing area level
- landing data
- landing direction indicator
- landing distance
- landing distance available
- landing flare
- landing gear
- landing gear doors
- landing gear down-lock pin
- landing gear down lock pin
- landing light
- landing strip
- landing surface
- landing threshold
- landing threshold point
- landing weight
- landplane
- landside operations
- lap strap
- lapse rate
- large-scale meteorological situation
- large scale weather situation
- laser-beam critical flight zone
- laser-beam free flight zone
- laser-beam sensitive flight zone
- last-minute change
- lateral deviation
- lateral deviation display
- lateral navigation
- lateral stability
- latitude
- lavatory smoke detection system
- layer
- lazy eight
- lead-in line
- lead-out line
- leading-edge radiator
- leading edge
- leased aircraft
- lee wave
- left-right indicator
- lenticular cloud
- letter of approval
- Level 1 airport
- licensed empty weight
- life-saving flotation equipment
- life raft
- liferaft
- lift
- lift-to-drag ratio
- lift coefficient
- lift wire
- lifting operation
- liftoff
- liftoff speed
- light-sport aircraft
- light aircraft
- light drizzle
- lighter-than-air aircraft
- lima
- limit load
- line-squall
- line check
- line maintenance
- line of sight
- line squall
- link pin
- load classification number
- load factor
- load ring
- load sheet
- loading bridge
- local mean time
- local traffic
- local traffic regulations
- localizer
- location sign
- log book
- logbook
- long-haul flight
- long-range communication system
- long-range navigation system
- long approach
- long landing
- long radius exit
- long range air navigation system
- longeron
- longitudinal axis
- longitudinal stability
- loss of control in flight
- loss of tail rotor effectiveness
- lost baggage
- lost luggage
- low
- low-pressure area
- low-speed stall
- low-wing monoplane
- low drifting
- low flight
- low frequency
- low latitudes
- low pass
- low press unit
- low pressure compressor
- low visibility procedures
- low visibility take-off
- lowest safe altitude
- lowest safety altitude
- loxodrome
- loxodromic curve
- LSA
- LSALT
- lugagge
- luggage