LM
Initialism of liquid methane.
Aviation maintenance
479 entries in this trade.
LOC
Initialism of loss of control.
LOI
Initialism of lunar orbit insertion: NASA terminology for a spacecraft maneuver to enter into orbit around the Moon.
loiter
For an aircraft to remain in the air near a target.
LORRI
Acronym of Long-Range Reconnaissance Imager, a long-focal-length imager designed for high resolution and responsivity at visible wavelengths.
LPRP
Initialism of Lunar Precursor Robotic Program.
LPSC
Initialism of Lunar and Planetary Science Conference.
LRO
Initialism of Lunar Reconnaissance Orbiter.
LTE
Initialism of loss of tail rotor effectiveness (by a helicopter).
LTO
Initialism of lunar transfer orbit.
LWS
Initialism of Living with a star.
magnetoplasmadynamics
The scientific study of the motion of plasma in the presence of a magnetic field.
MAHLI
Initialism of Mars Hand Lens Imager, a scientific instrument of the Mars Science Laboratory on board the Curiosity rover on Mars.
mainspar
The main spar of an aircraft
MARDI
Abbreviation of Mars Descent Imager (a scientific instrument of the Mars Science Laboratory aboard the Curiosity rover on Mars).
Mars rover
A vehicle, either crewed or uncrewed, designed to travel across the surface of Mars for scientific exploration.
MastCam
Abbreviation of Mast camera, a type of camera found on certain unmanned space rovers including the Curiosity rover at Mars.
MAVEN
Acronym of Mars Atmosphere and Volatile Evolution Mission, a space probe designed to investigate the Martian climate.
max Q
Abbreviation of maximum dynamic pressure (the maximum pressure from aerodynamic forces experienced while traveling through the atmosphere).
MCO
Initialism of miscellaneous charge order.
MECO
Acronym of main engine cut-off.
MEDLI
Initialism of MSL Entry, Descent, and Landing Instrumentation, a suite of engineering sensors in the Mars Science Laboratory entry vehicle heat shield involved in the landing of the Curiosity rover on Mars.
MEP
Initialism of Mars Exploration Program.
MER
Initialism of Mars Exploration Rover.
metric
To measure or analyse statistical data concerning the quality or effectiveness of a process.
MGS
Initialism of Mars Global Surveyor.
microsatellite
An artificial satellite between 10 and 100 kilograms in mass.
midair
A collision between two or more aerospace vehicles in flight.
minimum connecting time
The amount of time, agreed in advance between airlines and airport authorities, that is considered sufficient for a passenger to make a connection between an arriving flight and a departing flight on the same ticket.
minisatellite
an artificial satellite massing between 100 and 500 kilograms
missed approach
A go-around from an instrument approach performed, for whatever reason, at a time when the aircraft is at or above the applicable decision height or minimum descent altitude.
MMOD
Initialism of micrometeoroid and orbital debris.
moonwalk
An exploration of the Moon's surface on foot by an astronaut.
movement
An instance of an aircraft taking off or landing.
MPO
Initialism of Mercury Planetary Orbiter.
MPS
Initialism of main propulsion system (of the Space Shuttle).
MRO
Initialism of maintenance, repair, and overhaul.
MSA
Initialism of Malaysia-Singapore Airlines.
MSR
Initialism of Mars Sample Return mission.
MTF
Initialism of Mississippi Test Facility.
multistage
adjectiveAviation maintenance
Composed of multiple detachable parts.
narrowbody
An airliner capable of seating, at most, six or fewer passengers in a single row of economy seating, with one aisle.
NAT
Abbreviation of North Atlantic Tracks.
Navcam
Abbreviation of navigation camera, a type of engineering camera found on certain unmanned space rovers including the Curiosity rover on Mars.
ND
Initialism of navigation display.
NextSTEP
Name for a set of projects that aim to develop technology for human spaceflight in deep space exploration.
NF
Prefix code for NASA research fighter plane designations.
NGST
Initialism of New Generation Space Telescope.
NLS
Initialism of National Launch System.
nose cap
The protective covering on the end of an aircraft fuselage.
NPOESS
Initialism of National Polar-orbiting Operational Environmental Satellite System.
NPP
Initialism of NPOESS Preparatory Project.
NTR
Initialism of nuclear thermal rocket.
nuclear rocket
A rocket with a nuclear reactor aboard.
nuclear-electric rocket
a rocket with an ion engine powered by a nuclear reactor
nuclear-thermal rocket
a rocket with a thermal gas exhaust engine, whereby the thermal fluid is heated by the nuclear reactor
nuclear-thermoelectric rocket
a rocket with a thermal ion engine, whereby the ions are ionized by electricity from a nuclear reactor, and the fluid that is the source of the ions is heated by that nuclear reactor to increase specific impulse.
OH
Initialism of observation helicopter.
oleo
A type of energy-absorbing landing gear strut in which sudden compression or extension of the strut causes a gas-filled chamber to push or pull a piston which forces oil through a small orifice, resulting in absorption of energy through viscous effects.
OMS
Initialism of orbital manoeuvering system: NASA terminology for orbital maneuvering rockets.