For many years it has been standard practice to use a deadman system for aircraft refuelling, which automatically stops the fuel flow when the operator releases a hand held switch. The switch is normally electric and is fed through a current limiting device via an extensible coiled suzie cable.
However, there are some problems with this system. The suzie cables are not always long enough and therefore tend to be over stretched, with possible problems as e.g short circuit, causing the deadman system to be permanently operating, even when the switch is released. Also, it is now becoming more common for the refuelling operator to operate the aircraft fuel control panel whilst refuelling. This can require even longer suzie cables for underwing refuelling, or the use of a second suzie cable/switch mounted on the vehicle elevating platform when refuelling underwing wide bodied aircraft.There is now a system available which helps overcome these problems, the Wireless Deadman System. .
The wireless deadman system uses a control handle in order to send a codified signal to a receiving unit, located in the refuelling unit. This unit communicates constantly with the control handle and consequently controls the deadman system of the vehicle.
The signal is digital type and transmits on an intermittent temporized base, the receiver and control handle are codified together. This combination of characteristics allows the unit to operate without accidental interferences of random radio signals or of the adjacent wireless deadman systems.
The control handle is made in an ergonomic way and is extremely resistant but light. It is supplied with a reloadable battery working continuously for approximately 6 hours, and incorporates a transmission light and a low battery light, that indicates the operator that the charge is 12%. When the refuelling operation is finished the control handle is recovered in an appropriate lodging, and to that point the battery is automatically charged.
The charging system does not use electrical contacts, so it is not possible to have sparks or short circuits.
The action of the lodging of the control handle sends automatically a signal to the interlock system to lock the vehicle. It is therefore impossible to move the vehicle less than the control handle it is not lodged, thus that it cannot be involuntarily left on the airplane.
The control handle is also fitted with n. 2 additional push-buttons for distance control, which can be used for various functions like engine stop, winding reel or any other remote activation.
This wireless allows the operator to move everywhere in the refuelling area. The device can be set in a way that the system closes if the operator goes too far.
- The system is constituted from receiver, emitter (control handle) and battery charger.
- Operating Frequency: 2,4 GHz .
- Operativity Area: 30 meters.
- Full duplex communication between transmitter and receiver.
- External Antenna with option of extention.
- Feeding: 22-30 VDC.
- Output: deadman, green light deadman, noise alarm, lodging for control handle on battery charger, engine stop (optional), winding reel (optional), lights signal of feeding and communication.
- Body: aluminium light alloy.
- Dimensions: 175 mm x 80 mm x 60 mm.
- Weight: 0,8 kg.
Consumption: 50 mA.
Aerial : incorporated.
Feeding: Lithium polymers battery 3.6V, 370mAh, reloadable without contacts.
Operativity temperature from -40 to 60°C.
Control button: deadman (working through an handle made of stainless steel), emergency button, extra reel winding function.
Light signals: red led - active transmission of refueling activities (distribution, distribution with alarm, distribution interrupted); red led – run out battery; red led – battery on charge.
Body: light aluminium alloy, PVC.
Dimensions: 30 mm x 40 mm x 240 mm.
Weight: 0,2 kg.
- Power supply: 22-30 VDC.
- Charge to induction without contacts.
Body: PVC material.
Dimensions: 60 mm x 60 mm x 75 mm.
Weight: 0,5 kg
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