Slide background

ROLL OVER "DETAILED VIEWS," ABOVE, OR SELECT FROM THE LIST AT THE BOTTOM OF THE PAGE

SENSORS & SWITCHES
in aircraft applications
Slide background
Cargo
Door
Detects and monitors position of cargo door
on aircraft.
Sealed Switches
MICRO SWITCH Sealed Basic Switches
Proximity Switches
IHM Proximity Switches
FW Series Proximity Switches
Back to CARGO DOOR & LANDING GEAR
MICRO SWITCH
Sealed Basic Switches
  • Environmentally and hermetically sealed
    per enclosure design MIL-PRF-8805
  • Variety of auxiliary actuators
  • Choice of terminal styles
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheets

SE/XE Series

HM Series

Back to CARGO DOOR
IHM Proximity Switch
  • True "three-state" output option indicates target near, far, and fault
    detected (useful for aircraft maintenance / troubleshooting)
  • Most competitive products only offer near and far output
  • Proprietary technology provides extremely stable operation and
    health monitoring annunciation
  • Maintains accuracy during rapid temperature and altitude changes
  • FAVCO technology for real-time detection of faults
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to CARGO DOOR
FW Series
Proximity Switch
  • One-piece and two-piece construction options
  • Zero speed and bi-directional sensing
  • Lead wire or connector termination
  • High level of electronics protection
  • Small housing
More information

Online products and documentation

Range guide

Complete product portfolio

Back to CARGO DOOR
Slide background
Landing
Gear
Detect and monitor the landing gear positions:
uplock, downlock, weight on wheels and gear bay
doors (closed/locked). Can also monitor nose-
wheel steering and wheel brake force sensing.
Proximity Switches
IHM Proximity Switches
FW Series Proximity Switches
Sealed Switches
MICRO SWITCH Sealed Limit Switches
Speed Sensors
VRS Series
Precision Thermostats
Military/Commercial Aircraft Thermostats
Position Transmitters
Aero Linear Variable Differential Transformers
Back to CARGO DOOR & LANDING GEAR
IHM Proximity Switch
  • True "three-state" output option indicates target near, far, and fault
    detected (useful for aircraft maintenance / troubleshooting)
  • Most competitive products only offer near and far output
  • Proprietary technology provides extremely stable operation and
    health monitoring annunciation
  • Maintains accuracy during rapid temperature and altitude changes
  • FAVCO technology for real-time detection of faults
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to LANDING GEAR
FW Series
Proximity Switch
  • One-piece and two-piece construction options
  • Zero speed and bi-directional sensing
  • Lead wire or connector termination
  • High level of electronics protection
  • Small housing
More information

Online products and documentation

Range guide

Complete product portfolio

Back to LANDING GEAR
MICRO SWITCH
Sealed Limit Switches
  • Meets or exceeds mechanical and electrical life as defined
    in MIL-PRF-8805
  • Top plunger and roller plunger actuators have an internal
    ice scraper ring
  • Variety of actuators and terminations
  • Variety of contact options and contact materials
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheets

EN Series

HE Series

HR Series

Back to LANDING GEAR
VRS Speed Sensors
  • For use where the sensor is exposed to temperatures
    up to 260 °C [450 °F]
  • Sealed front-end versions offered
  • Self-powered operation
  • Direct conversion of actuator speed to output frequency
  • Customized VRS products for unique speed sensing
    applications
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to LANDING GEAR
Military/Commercial
Aircraft Thermostats
  • Military qualified
  • Hermetically sealed
  • Tight tolerances and differentials
  • SPST contacts
  • Mounting brackets and terminals
  • Temperature calibrations are pre-set at the factory
  • Each unit is thermally and mechanically inspected
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to LANDING GEAR
Position Transmitters
  • Multiple sensors in one bolt-on assembly (LRU) configured
    to customer-specific requirements
  • Designed to prevent common mode failures: high integrity
    for critical applications
  • Precision gearing enables indirect position measurement
  • Full qualification and design support to industry standards
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to LANDING GEAR
Slide background
Flight Control
Surfaces
Detect and monitor position of high lift
flight control surfaces (flaps / slats / spoilers),
slat-skew deployment and position sensing,
and actuator valve position sensing.
Proximity Switches
IHM Proximity Switches
FW Series Proximity Switches
Sealed Switches
MICRO SWITCH Sealed Limit Switches
Aerospace Position Measurement
RVDTs
LVDTs
Back to AIRCRAFT OVERVIEW – MAIN
IHM Proximity Switch
  • True "three-state" output option indicates target near, far, and fault
    detected (useful for aircraft maintenance / troubleshooting)
  • Most competitive products only offer near and far output
  • Proprietary technology provides extremely stable operation and
    health monitoring annunciation
  • Maintains accuracy during rapid temperature and altitude changes
  • FAVCO technology for real-time detection of faults
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to FLIGHT CONTROL SURFACES
FW Series
Proximity Switch
  • One-piece and two-piece construction options
  • Zero speed and bi-directional sensing
  • Lead wire or connector termination
  • High level of electronics protection
  • Small housing
More information

Online products and documentation

Range guide

Complete product portfolio

Back to FLIGHT CONTROL SURFACES
MICRO SWITCH
Sealed Limit Switches
  • Meets or exceeds mechanical and electrical life as defined
    in MIL-PRF-8805
  • Top plunger and roller plunger actuators have an internal
    ice scraper ring
  • Variety of actuators and terminations
  • Variety of contact options and contact materials
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheets

EN Series

HE Series

HR Series

Back to FLIGHT CONTROL SURFACES
RVDTs
  • Assemblies and components engineered to meet exposed,
    on-wing environment
  • Components designed for high temperature and vibration
    engine environment
  • Fully customizable to solve challenging position measurement
    problems
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to FLIGHT CONTROL SURFACES
LVDTs
  • Pre-validated platform approach: Single channel, dual channel,
    and dual tandem offerings
  • Rig point position
  • Improved mean time between failure (MTBF) through industry-
    leading winding techniques
  • Global engineering and application expertise
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to FLIGHT CONTROL SURFACES
Slide background
Cockpit
(Flight Deck)
These products control a variety of aircraft systems
in the cockpit such as engine fuel, hydraulic and
fuel pumps, navigation equipment, APU, lights and
other systems.
MICRO SWITCH Toggle Switches
TL Series
AT Series
ET Series
TW Series
MICRO SWITCH Pushbuttons
PB Series
Aerospace Position Measurement
RVDTs
LVDTs
Back to AIRCRAFT OVERVIEW – MAIN
MICRO SWITCH
TL Series Toggle Switches
  • MIL-DTL-3950 qualified switches available to meet
    military specifications
  • Environmental sealing enables switches to withstand
    many demanding indoor and outdoor applications
  • 1-, 2-, and 4-pole options for a variety of circuitry
    requirements
  • 2- and 3-position, maintained and momentary toggle
    action to meet circuit and actuator requirements
  • UL recognized, CSA certified, and CE approved for
    global use
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to COCKPIT (FLIGHT DECK)
MICRO SWITCH
AT Series Toggle Switches
  • Momentary and maintained action
  • 1, 2 or 3 SPDT precision basic switches
  • Short behind-panel depth
  • Choice of 1/4 or 15/32-inch bushings
  • Silver or gold contacts
  • UL recognized, CSA certified basic switches
More information

Online products and documentation

Range guide

Complete product portfolio

Catalog information

Series documentation

Back to COCKPIT (FLIGHT DECK)
MICRO SWITCH
ET Series Toggle Switches
  • Environment-proof sealing
  • Qualified to SAE AS55941 military standards
  • 2- and 3-position magnetically maintained toggle action
  • Various lever styles available
  • Turret, leadwire, and screw terminals
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to COCKPIT (FLIGHT DECK)
MICRO SWITCH
TW Series Toggle Switches
  • Qualified to MIL-DTL-83731
  • Miniature size, saves space and weight
  • SPDT and DPDT circuitry
  • Temperature range: -65 °C to 71 °C [-85 °F to 160 °F]
  • Silver alloy or gold-plated contacts
  • Sealed bushing versions
  • Choice of 1/4 in. or 15/32 in. bushing
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to COCKPIT (FLIGHT DECK)
MICRO SWITCH
PB Series Pushbuttons
  • Up to 4 poles
  • Some listings external parts corrosion resistant
    per MIL-PRF-8805/23
  • Some listings meet explosion proof requirements
    of MIL-PRF-8805/23
  • FAA and PMA approved and military specification
    listing available
More information

Online products and documentation

Range guide

Complete product portfolio

Back to COCKPIT (FLIGHT DECK)
RVDTs
  • Assemblies and components engineered to meet exposed,
    on-wing environment
  • Components designed for high temperature and vibration
    engine environment
  • Fully customizable to solve challenging position measurement
    problems
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to COCKPIT (FLIGHT DECK)
LVDTs
  • Pre-validated platform approach: Single channel, dual channel,
    and dual tandem offerings
  • Rig point position
  • Improved mean time between failure (MTBF) through industry-
    leading winding techniques
  • Global engineering and application expertise
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to COCKPIT (FLIGHT DECK)
Slide background
Overwing/
Main Exit/
Cargo Doors
Detects and monitors position of over wing exit door.
Sealed Switches
MICRO SWITCH Sealed Basic Switches
Proximity Switches
IHM Proximity Switches
Back to AIRCRAFT OVERVIEW – MAIN
MICRO SWITCH
Sealed Basic Switches
  • Environmentally and hermetically sealed
    per enclosure design MIL-PRF-8805
  • Variety of auxiliary actuators
  • Choice of terminal styles
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheets

SE/XE Series

HM Series

Back to OVERWING/MAIN EXIT/CARGO DOORS
IHM Proximity Switch
  • True "three-state" output option indicates target near, far, and fault
    detected (useful for aircraft maintenance / troubleshooting)
  • Most competitive products only offer near and far output
  • Proprietary technology provides extremely stable operation and
    health monitoring annunciation
  • Maintains accuracy during rapid temperature and altitude changes
  • FAVCO technology for real-time detection of faults
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to OVERWING/MAIN EXIT/CARGO DOORS
Slide background
Engine
Fuel/engine valve and nozzle position sensing;
transmission position; turbine engine, fuel pump,
APU, and propeller speed sensing; bleed air and
de-icing system temperature sensing; torque
sensing; and oil, fuel pressure, and flow sensing.
Proximity Switches
IHM Proximity Switches
FW Series Proximity Switches
Sealed Switches
MICRO SWITCH Sealed Limit Switches
Aerospace Position Measurement
RVDTs
LVDTs
Precision Thermostats
Military/Commercial Aircraft Thermostats
Speed Sensors
VRS Series
Pressure Switches
1HP Series
Back to ENGINE & FUEL DOOR
IHM Proximity Switch
  • True "three-state" output option indicates target near, far, and fault
    detected (useful for aircraft maintenance / troubleshooting)
  • Most competitive products only offer near and far output
  • Proprietary technology provides extremely stable operation and
    health monitoring annunciation
  • Maintains accuracy during rapid temperature and altitude changes
  • FAVCO technology for real-time detection of faults
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to ENGINE
FW Series
Proximity Switch
  • One-piece and two-piece construction options
  • Zero speed and bi-directional sensing
  • Lead wire or connector termination
  • High level of electronics protection
  • Small housing
More information

Online products and documentation

Range guide

Complete product portfolio

Back to ENGINE
MICRO SWITCH
Sealed Limit Switches
  • Meets or exceeds mechanical and electrical life as defined
    in MIL-PRF-8805
  • Top plunger and roller plunger actuators have an internal
    ice scraper ring
  • Variety of actuators and terminations
  • Variety of contact options and contact materials
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheets

EN Series

HE Series

HR Series

Back to ENGINE
RVDTs
  • Assemblies and components engineered to meet exposed,
    on-wing environment
  • Components designed for high temperature and vibration
    engine environment
  • Fully customizable to solve challenging position measurement
    problems
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to ENGINE
LVDTs
  • Pre-validated platform approach: Single channel, dual channel,
    and dual tandem offerings
  • Rig point position
  • Improved mean time between failure (MTBF) through industry-
    leading winding techniques
  • Global engineering and application expertise
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to ENGINE
Military/Commercial
Aircraft Thermostats
  • Military qualified
  • Hermetically sealed
  • Tight tolerances and differentials
  • SPST contacts
  • Mounting brackets and terminals
  • Temperature calibrations are pre-set at the factory
  • Each unit is thermally and mechanically inspected
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to ENGINE
VRS Speed Sensors
  • For use where the sensor is exposed to temperatures
    up to 260 °C [450 °F]
  • Sealed front-end versions offered
  • Self-powered operation
  • Direct conversion of actuator speed to output frequency
  • Customized VRS products for unique speed sensing
    applications
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to ENGINE
Pressure Switches
  • Qualified to RTCA DO-160D, MIL-PRF-8805
  • 150 psi to 5000 psi
  • 12000 psi burst pressure
  • High current or logic-level load options
  • Configurable with multiple pressure fittings and
    electrical connectors
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to ENGINE
Slide background
Fuel
Door
Detects and monitors position of the fuel
refueling door.
Proximity Switches
IHM Proximity Switches
FW Series Proximity Switches
Sealed Switches
MICRO SWITCH Sealed Basic Switches
Back to ENGINE & FUEL DOOR
IHM Proximity Switch
  • True "three-state" output option indicates target near, far, and fault
    detected (useful for aircraft maintenance / troubleshooting)
  • Most competitive products only offer near and far output
  • Proprietary technology provides extremely stable operation and
    health monitoring annunciation
  • Maintains accuracy during rapid temperature and altitude changes
  • FAVCO technology for real-time detection of faults
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to FUEL DOOR
FW Series
Proximity Switch
  • One-piece and two-piece construction options
  • Zero speed and bi-directional sensing
  • Lead wire or connector termination
  • High level of electronics protection
  • Small housing
More information

Online products and documentation

Range guide

Complete product portfolio

Back to FUEL DOOR
MICRO SWITCH
Sealed Basic Switches
  • Environmentally and hermetically sealed
    per enclosure design MIL-PRF-8805
  • Variety of auxiliary actuators
  • Choice of terminal styles
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheets

SE/XE Series

HM Series

Back to FUEL DOOR
Slide background
Cabin Galley
Operator controls are used to control systems
in the flight attendant cabin galleys.
MICRO SWITCH Toggle Switches
TL Series
ET Series
TW Series
Precision Thermostats
Military/Commercial Aircraft Thermostats
Back to REAR FUSELAGE
MICRO SWITCH
TL Series Toggle Switches
  • MIL-DTL-3950 qualified switches available to meet
    military specifications
  • Environmental sealing enables switches to withstand
    many demanding indoor and outdoor applications
  • 1-, 2-, and 4-pole options for a variety of circuitry
    requirements
  • 2- and 3-position, maintained and momentary toggle
    action to meet circuit and actuator requirements
  • UL recognized, CSA certified, and CE approved for
    global use
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to CABIN GALLEY
MICRO SWITCH
ET Series Toggle Switches
  • Environment-proof sealing
  • Qualified to SAE AS55941 military standards
  • 2- and 3-position magnetically maintained toggle action
  • Various lever styles available
  • Turret, leadwire, and screw terminals
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to CABIN GALLEY
MICRO SWITCH
TW Series Toggle Switches
  • Qualified to MIL-DTL-83731
  • Miniature size, saves space and weight
  • SPDT and DPDT circuitry
  • Temperature range: -65 °C to 71 °C [-85 °F to 160 °F]
  • Silver alloy or gold-plated contacts
  • Sealed bushing versions
  • Choice of 1/4 in. or 15/32 in. bushing
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to CABIN GALLEY
Military/Commercial
Aircraft Thermostats
  • Military qualified
  • Hermetically sealed
  • Tight tolerances and differentials
  • SPST contacts
  • Mounting brackets and terminals
  • Temperature calibrations are pre-set at the factory
  • Each unit is thermally and mechanically inspected
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to CABIN GALLEY
Slide background
Auxiliary
Power Unit (APU)
Detect and monitor position of APU fuel / bleed
air valves and air in-take door.
Proximity Switches
IHM Proximity Switches
FW Series Proximity Switches
Sealed Switches
MICRO SWITCH Sealed Limit Switches
Aerospace Position Measurement
RVDTs
LVDTs
Precision Thermostats
Military/Commercial Aircraft Thermostats
Speed Sensors
VRS Series
Pressure Switches
1HP Series
Back to REAR FUSELAGE
IHM Proximity Switch
  • True "three-state" output option indicates target near, far, and fault
    detected (useful for aircraft maintenance / troubleshooting)
  • Most competitive products only offer near and far output
  • Proprietary technology provides extremely stable operation and
    health monitoring annunciation
  • Maintains accuracy during rapid temperature and altitude changes
  • FAVCO technology for real-time detection of faults
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to AUXILIARY POWER UNIT
FW Series
Proximity Switch
  • One-piece and two-piece construction options
  • Zero speed and bi-directional sensing
  • Lead wire or connector termination
  • High level of electronics protection
  • Small housing
More information

Online products and documentation

Range guide

Complete product portfolio

Back to AUXILIARY POWER UNIT
MICRO SWITCH
Sealed Limit Switches
  • Meets or exceeds mechanical and electrical life as defined
    in MIL-PRF-8805
  • Top plunger and roller plunger actuators have an internal
    ice scraper ring
  • Variety of actuators and terminations
  • Variety of contact options and contact materials
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheets

EN Series

HE Series

HR Series

Back to AUXILIARY POWER UNIT
RVDTs
  • Assemblies and components engineered to meet exposed,
    on-wing environment
  • Components designed for high temperature and vibration
    engine environment
  • Fully customizable to solve challenging position measurement
    problems
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to AUXILIARY POWER UNIT
LVDTs
  • Pre-validated platform approach: Single channel, dual channel,
    and dual tandem offerings
  • Rig point position
  • Improved mean time between failure (MTBF) through industry-
    leading winding techniques
  • Global engineering and application expertise
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to AUXILIARY POWER UNIT
Military/Commercial
Aircraft Thermostats
  • Military qualified
  • Hermetically sealed
  • Tight tolerances and differentials
  • SPST contacts
  • Mounting brackets and terminals
  • Temperature calibrations are pre-set at the factory
  • Each unit is thermally and mechanically inspected
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to AUXILIARY POWER UNIT
VRS Speed Sensors
  • For use where the sensor is exposed to temperatures
    up to 260 °C [450 °F]
  • Sealed front-end versions offered
  • Self-powered operation
  • Direct conversion of actuator speed to output frequency
  • Customized VRS products for unique speed sensing
    applications
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to AUXILIARY POWER UNIT
Pressure Switches
  • Qualified to RTCA DO-160D, MIL-PRF-8805
  • 150 psi to 5000 psi
  • 12000 psi burst pressure
  • High current or logic-level load options
  • Configurable with multiple pressure fittings and
    electrical connectors
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to AUXILIARY POWER UNIT
Slide background
Cabin/Environmental
Controls
Detects and monitors position of pressurization
system and outlet valves.
Sealed Switches
MICRO SWITCH Sealed Basic Switches
Aerospace Position Measurement
RVDTs
LVDTs
Pressure Switches
1HP Series
Precision Thermostats
Military/Commercial Aircraft Thermostats
Board Mount Pressure Sensors
TruStability™
Back to REAR FUSELAGE
MICRO SWITCH
Sealed Basic Switches
  • Environmentally and hermetically sealed
    per enclosure design MIL-PRF-8805
  • Variety of auxiliary actuators
  • Choice of terminal styles
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheets

SE/XE Series

HM Series

Back to CABIN/ENVIRONMENTAL CONTROLS
RVDTs
  • Assemblies and components engineered to meet exposed,
    on-wing environment
  • Components designed for high temperature and vibration
    engine environment
  • Fully customizable to solve challenging position measurement
    problems
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to CABIN/ENVIRONMENTAL CONTROLS
LVDTs
  • Pre-validated platform approach: Single channel, dual channel,
    and dual tandem offerings
  • Rig point position
  • Improved mean time between failure (MTBF) through industry-
    leading winding techniques
  • Global engineering and application expertise
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to CABIN/ENVIRONMENTAL CONTROLS
Pressure Switches
  • Qualified to RTCA DO-160D, MIL-PRF-8805
  • 150 psi to 5000 psi
  • 12000 psi burst pressure
  • High current or logic-level load options
  • Configurable with multiple pressure fittings and
    electrical connectors
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to CABIN/ENVIRONMENTAL CONTROLS
Military/Commercial
Aircraft Thermostats
  • Military qualified
  • Hermetically sealed
  • Tight tolerances and differentials
  • SPST contacts
  • Mounting brackets and terminals
  • Temperature calibrations are pre-set at the factory
  • Each unit is thermally and mechanically inspected
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheet

Series documentation

Back to CABIN/ENVIRONMENTAL CONTROLS
TruStability™ Board
Mount Pressure Sensors
  • Industry-leading long-term stability, accuracy and flexibility
  • Small size
  • Excellent repeatability
  • Extremely low power consumption
  • Low operating voltage
  • Virtually insensitive to mounting orientation
More information

Online products and documentation

Range guide

Complete product portfolio

Datasheets

TSC Series/NSC Series

HSC Series

SSC Series

Back to CABIN/ENVIRONMENTAL CONTROLS