SubscribeAll underground solutions provided by Cavotec Fladung GmbH are fully equipped to provide a comprehensive supply of services.
Cavotec Fladung GmbH has a full range of Under-floor Solutions to choose from:
- Pop-Up Pit Systems
- Hatch Type Pit Systems
These solutions can either be used in combination with our Tunnel System,
on apron parking areas for 400 Hz, PCA, Waste Water, Blue Water, Potable Water, or in individual concrete pits. These concrete pits are either cast on the spot or pre-cast.
All Cavotec-Fladung Under-floor solutions feature the following advantages:
- Can be rolled over at 90 tons
- Easy handling at any time, service points above apron level
- Good accessibility for maintenance
- Low maintenance cost
- Range of lifting options to chose from :
- Gas spring support, electrical, counterbalanced
- when fully open, there is no gap
- service points upgradeable
- when unlocked and fully retracted it is flush with the apron
- waterproof design
Pop-Up Pit System with Tunnel
Pre-conditioned Air (PCA)
The pit is fitted with the connecting hose required to transport the air-conditioned air into the aircraft. As this is a spiral hose it is just 1/10th of its original length when stored. The spiral hose is connected to the air delivery side of the air-conditioning equipment, and there is an adapter at the top-end, used to connect it to the aircraft.
The hose is stored in a storage device that is designed to hold a hose of up to 28 m in length. A dependency circuit has been provided above the proximity switch, which only enables the activation of the air-conditioning unit when the PCA suction pit has been extended up to the end position.
2.400Hz/28V Power Supply
The cables required for the power supply to parked aircraft are mounted in the pit.
Optionally, 400 Hz and 28V cables can be fitted on each pit system. The cables are anchored in the shaft in a separate collection container.
Each cable is equipped with an aircraft connector that conforms to the Aviation Standard 29845. This connector is connected to the aircraft after the cable has been manually pulled out of the shaft. After the connector has been plugged in, power supply can controlled by buttons fitted on the connector.
The connector has been plugged in properly when "Pilot Contact" is displayed on an LED. This display is controlled by a micro-switch circuit built into the E contact of the connector. The switching takes place after the connector has been plugged-in 80% of the way into the socket of the aircraft.
This feature can also be set-up to stop operation of the passenger bridge in case of wrong connection or power failure.
Waste and blue water supply
A suction hose with adapter is attached to the pit system for the removal of waste water and blue water from the aircraft. The suction hose is stored on a drum in the shaft, which is in turn connected to a vacuum pump. In the resting position, the drum is released, making it possible to pull the adapter together with the hose, and to connect them to the aircraft.
There is a second hose in the pit system for filling the washing water tank in the aircraft. This hose is connected to a water meter so that the filling process can be measured. This hose is also stored on a drum in the shaft. There are two keys above the suction adapter for winding the hoses.
Pop-Up Pit System
- Weight & Dimensions:
- Weight: 1000 kg
- Dimensions: L = 1070 mm, W = 915 mm, H = 2200 mm
General description: The pit system is used for storing the connecting cable, used between the converter and the aircraft, when it is not in use. When in use, the connecting cable exits through a cable guide installed in the pop-up unit. The pop-up can then be lowered and closed, making it flush with the tarmac apron. Depending on the model, there may be one or two extension cables installed on the pit system.
The pop-up unit of the pit system is mounted on bearings, on a hard chrome-plated shaft, ensuring smooth movement during the in-feed and out-feed of the cable.
The pop-up unit is supported by counterweights. Weighting plates of around 4 kg each have been placed in a weighting cabinet. The pop-up and retraction speed of the unit can be controlled by adding or removing plates. The counterweight is guided by a sheet steel housing.
The pop-up unit is fixed onto a turning joint that opens outwards and forwards when the cable is pulled out, thereby allowing the cable to be pulled out smoothly. Each panel connector has a spring-loaded, anchored cover which secures the cable in place during cable in-feed or out-feed.
An emergency OFF-switch and two position lamps are housed in the terminal box of the pop-up unit of the pit system.
The structure of the pit system is designed with a traffic-carrying capacity based on Bridge Class F90
Electrical description: The power supply, control functions, and the 208V/400 Hz power supply to the aircraft are all supplied through the converter in the EX terminalbox X2 housed in the pit system shaft.
The control cores for the proximity switch, the emergency off switch and the position lights from this housing are connected to the pit system.
Similarly, the extension cable, which consists of 4 twisted single, flexible, special cores, is also clamped into this EX housing. Each of these cores contain 4 control cores. The key commands and LED's are generated by the converter.
A measuring circuit is placed directly on the connector under each power core. This makes it possible to measure the existing voltage directly on the connector. The measurements are relayed to the converter which then switches off the voltage if required.
The entire pit system is de-energised in the closed condition. The power supply is switched on once the pit system is raised to the end-stop and the proximity switch closes the electrical circuit. As soon as the pit system is lowered, the switch contact breaks and the power to the entire system is cut off.
Hangar Solutions
Modern aircraft require the most advanced and state-of-the-art service points, inside both existing and new hangar structures. To meet this demand Cavotec-Fladung has developed several innovative solutions to bring the essential services such as power, water and pre-conditioned air, from just one Pit installation. This can either be as a Pop Up or Hatch solution.
Above pictures show several examples of what these solutions look like. All systems can be either integrated into tunnels or individual concrete pits. Custom-made solutions and standard systems are available from Cavotec Fladung.
Today, these types of systems are used all around the world at military installations, inside aircraft manufacturing plants and at airline service and maintenance hangars.
Hatch Pits
Through its innovative design the Cavotec Fladung Hatch Pit allows easy access to all service outlets. Servicing aircraft has never been so user-friendly!
Advantages of the Cavotec Fladung Hatch Pit:
- can be rolled over at 90 tons
- easy handling at any time, service points above apron level
- good accessibility for maintenance
- available with optional maintenance cover
- low maintenance cost
- pressure spring lifting mechanism: optional electrical or with traditional counterbalance system
- no gap when pit is fully opened
- waterproof design
- all parts are hot galvanized. Screws and fixing parts are stainless steel
