Side Sliding Aperture

Side Sliding Aperture


Our aperture hangar door systems are available in many configurations to meet your specific requirements. Having built aperture door systems for aircraft such as the C-130, C-17, C-18, C-5 and the 747-400, we are confident that we can build a system that will meet your requirements and your imagination.


Doors are designed using CAD and structural engineering software. Door frame structure and connection designs are certified by an independent engineer. Door frames are engineered using structural steel and cold formed members per AISC and AISI codes. Wind loads are calculated using your location and building size for the most accurate structural loading possible. We don't make an assumption on the wind load by using an arbitrary standard, we verify every time.


Door components are manufactured to the highest standards and designed to be completely bolt together, avoiding costly delays due to welding inspections and the availability of certified welders in the field. Door components are also designed to have as few connections as possible, simplifying and increasing assembly speed on the job. This lowers the total installed cost for your door system.


Our aperture systems are designed to move vertically and laterally to allow alignment of the aperture seals to the aircraft over varying aircraft weights and aircraft position. Vertical adjustment is made by hydraulic cylinder counterweight system integrated with a spring counterbalance. This allows the aperture to move vertically if the aircraft where to move under wind or seismic loads. Aperture door panels are equipped with an exterior closure panel that seals the aperture opening when smaller aircraft are in the hangar and the aperture is not needed.

Support Wheels

Our support guide wheels are machined in house on CNC lathes and assembled using taper roller bearings to transmit the vertical forces imposed by the weight of the door and the lateral forces imposed by wind and seismic loads. Support wheels are supplied with grease fittings installed on the support axles and taper bearing adjusters. Support wheels can be removed from the door panel through the top of the wheel box, allowing bearing/axle maintenance without having to remove the door from the track.

Top Guide Wheels

Door top guide wheels are equipped with permanently lubricated roller bearings to ensure long life and low maintenance requirements. Door top guide wheels are mounted on a telescoping guide bracket that will expand and collapse to absorb differences in guide rail height due to live and seismic forces exerted against the building. Top guide bracket can be made to absorb virtually any building.

Drive System

Drive motor(s) is installed onto a mounting plate that is adjustable for chain tension. Drive motor has a worm gear drive gearbox and is equipped with a motor brake that is directly mounted to the drive motor. Chain drive features an overload clutch to prevent damage in the case of overloading. Overload clutch is easily released, allowing manual operation in the event of a power failure.


Weatherstrip is 1/8" cloth inserted epdm. Weatherstrip meets military specifications for durometer, UV resistance and incidental exposure to paint thinners. Retainer bar is fastened by zinc coated self drilling screws every 8" for a secure seal without oil canning of retainer bar. Retainer bar is easily removed for replacement of weatherstripping if it becomes necessary. Leading edge bubble seals allow for 4" of compression.

Electrical Controls

Door control panels are manufactured in house using only the highest quality UL listed components. Door control systems utilize electromechanical relays that are highly resistant to electrical interference and have no programming that can become corrupted requiring service. Door control systems also utilize solid state proximity sensors for limiting door travel. These sensors are water proof and have no moving parts to wear out. Door control systems can be supplied ranging from 12VDC to 600VAC. Variable frequency drives are available for custom tuning or varying of door drive speed. Variable frequency drives come with variable speed buttons with 3 adjustable speed settings standard, 5 speeds as an option.

Power Feed

Standard power feed system supplied is a drape cord design. With no trolleys to wear out or become tangled a drape cord system offers many years of trouble free service. Also available is a trolley duct power feed system. Trolley duct power feed offers a superior installed appearance and very long service life. Trolley duct can be ordered in straight and radius sections so virtually any type of door system can be designed for trolley duct.

Standard options

Timer delay with safety noisemaker and/or strobe light, safety edge with delay and/or auto reverse, personnel door frames and safety interlock sensors, bumper door collection system, cable drive door collection system, explosion proof drive system, air drive operating system, hydraulic drive operating system. Door drive motors and control panels are fully assembled, wired and tested at our facility prior to shipping.

Please call with your custom option requirements, we are here to create the system that meets your needs and your imagination.