OTHER SUPPORT SYSTEMS WHEN YOU CANNOT USE THE LANDING GEAR Page 4-47 Jul 01/2005
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4-30-5 Special Airplane Systems
1.  Vehicle Systems
A.  The Aircraft Recovery Transportation System (ARTS) from Goldhoffer Trailers is shown in Figure 4-29. This system was initially made to move a large width airplane (747 type) to the runway or along the runway. The system is made in modules. This permits you to change it to align with the configuration of a large airplane or a small one.
B.  There was one airplane recovery with this system that occurred before January 1992. In that recovery operation, the system moved a large width airplane (747). The damage to the airplane included no landing gear after a RTO (Refused Takeoff) accident. There are three available ARTS systems at different locations that you can use. The manufacturer can give you more data on their location and their operation (see the Vendor List in SUBJECT 5-20-3 of this document).
C.  Figure 4-30 and Figure 4-31 show a similar system called Disabled Aircraft Recovery Transport System (DARTS) which is manufactured by KAMAG of Germany. This system is available at Kai Tai Airport in Hong Kong. The ARTS and DARTS systems have been used for airplane recovery operations.
2.  Sledge Assembly Systems
A.  A recovery system (from A.M.S. Systems Engineering) is shown in Figure 4-32 and Figure 4-33. You use this system with other materials (aluminum panels, wood beams, etc) and vehicles to move the airplane. This is a good recovery solution if you have soft ground in your area.
B.  Figure 4-32 and Figure 4-33 show this system in a recovery operation that occurred before January, 1992. In that operation, the system moved an airplane that was 155 feet (47 meters) long, which weighed 100 tons (91 metric tons). The bad weather (heavy rains) caused a very soft ground surface in the area. Here are some more details:
(1)  
The ground below the airplane had a 25 degree slope from the runway. The nose of the airplane was below the soft ground surface. The main gears were below the soft ground surface and the folded nose gear pushed up into the fuselage.

(2)  
The recovery persons used special surface assemblies (brand name: Trakway Aluminum Panels) below the main gears (see Figure 4-33). These assemblies permitted the main gears to move on the surface of the ground and to the runway. They used the primary system component (the sledge) below the nose of the airplane. This primary component prevented more damage to the airplane and made the recovery an easy operation.

(3)  
Tow cables were the connection between the assembly system and two large recovery vehicles (winch tractors). Nine heavy loads, 30 ton (27 metric ton) coal lorries were attached to the recovery vehicles to make them stable. Then the tow recovery vehicles pulled the airplane to the runway.
　
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