DFLL Dual Filament Landing Light
Two-Axis Helicopter Landing and Search Light with Visible and Covert IR Modes for Defence Aviation
The DFLL Dual Filament Landing Light is a two-axis helicopter landing and search light designed, developed and manufactured by System Controls for low-speed airborne helicopter platforms. Delivering 300,000 cd peak visible light output through a parabolic reflector and covert IR illumination for NVG-assisted night operations, the DFLL extends from 0° to 120° in under 12 seconds at 180 knots and rotates continuously through N x 360° in under 15 seconds.
What is the Dual Filament Landing Light?
The DFLL Dual Filament Landing Light is a precision two-axis landing and search light designed, developed and manufactured by System Controls to meet the lighting requirements of low-speed airborne helicopter platforms. Precision rugged steel gear trains housed in a compact package provide retraction, extension and rotation through DC motors and a highly reliable slip ring rated to withstand operational wind loads. Limit switches cut off and restore power supply as required across the extension and rotation cycle.
| Parameter | Specification |
|---|---|
|
Number of Axes
|
Two
|
|
Extension/Retraction Angle
|
0° to 120°
|
|
Extension Time at 180 knots
|
Less than 12 seconds
|
|
Rotation Angle
|
N x 360°
|
|
Time for 360° Rotation at 180 knots
|
Less than 15 seconds
|
|
Maximum Platform Speed
|
330 km/hr
|
|
Visible Mode Reflector
|
Parabolic
|
|
Visible Mode Peak Light Output
|
300,000 cd
|
|
Visible Mode Beam Spread
|
14° H / 8° V
|
|
IR Mode Beam Angle
|
60° H / 60° V
|
|
Power Supply
|
28V DC
|
|
Power Consumption (Visible Mode)
|
280W
|
|
Power Consumption (IR Mode)
|
28W
|
|
Interface
|
Command signals from cockpit
|
|
Operating Temperature
|
-40°C to +71°C
|
|
Storage Temperature
|
-45°C to +85°C
|
|
Environmental Compliance
|
MIL-STD-810F
|
|
Power Supply Compliance
|
MIL-STD-704D
|
|
EMI/EMC Compliance
|
MIL-STD-461E
|
|
Model No
|
SP-10-00-000
|
All-Weather Reliability to MIL-STD-810F
The DFLL complies with MIL-STD-810F for environmental conditions, MIL-STD-704D for power supply and MIL-STD-461E for EMI/EMC, covering the full range of environmental, electrical and electromagnetic qualification requirements for defence helicopter platforms. Rated for operation from -40°C to +71°C and at platform speeds up to 330 km/hr, it is all-weather compliant for sustained operational use.
Covert IR Mode for NVG Night Operations
In IR mode the beam angle expands to 60° horizontal by 60° vertical, providing wide area covert infrared illumination for NVG-assisted night operations. Dual filament design enables seamless switching between high intensity visible mode at 280W and covert IR mode at just 28W, with illumination available in both modes across the full +90° to -90° rotation arc throughout continuous 360° rotation.
Precision Rugged Gear Train and Slip Ring Architecture
Precision rugged steel gear trains are housed in a compact package, driven by DC motors through a highly reliable slip ring rated to withstand the wind loads experienced during helicopter operations at speed. This combination of rugged gear mechanism and reliable slip ring ensures consistent, repeatable extension, retraction and rotation performance across the operational life of the unit in demanding defence aviation environments.
300,000 cd High Intensity Visible Illumination
The DFLL delivers 300,000 cd peak visible light output through a parabolic reflector with a focused beam spread of 14° horizontal by 8° vertical, providing the high intensity directed illumination required for precision helicopter landing in reduced visibility conditions. The compact, rugged construction houses the full optical and mechanical assembly in a lightweight package without compromising light output performance.
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The DFLL provides high intensity visible and covert IR illumination for helicopter landing, search and low-altitude operations. 300,000 cd peak output, 360° rotation and extension in under 12 seconds at 180 knots with cockpit command interface.
300,000 cd visible through a parabolic reflector, beam spread 14° H by 8° V. IR mode beam angle is 60° H by 60° V for wide area covert illumination.
Extension from 0° to 120° in less than 12 seconds at 180 knots. Full 360° rotation in less than 15 seconds at 180 knots. Maximum platform speed 330 km/hr.
Yes. IR mode delivers 60° H by 60° V beam angle for NVG-assisted operations. Both IR and visible modes are available across the full +90° to -90° rotation arc.
MIL-STD-810F for environmental conditions, MIL-STD-704D for power supply and MIL-STD-461E for EMI/EMC. Rated -40°C to +71°C at up to 330 km/hr platform speed.
Command signals from the cockpit interface control all extension, retraction, rotation and mode switching operations. Limit switches manage power cut-off and restoration at defined positions.
