A-A-58045B
clevis-pin type couplers shall be visible from the driver's position either directly or via a single
mirror mounted on the front and rear of the tow tractor.
3.25 Air transportability. The tow tractor shall be air transportable on C-141, C-17 and C-5
aircraft. Use MIL-HDBK-1791 as a guide. In all transport configurations, the tow tractor shall
be capable of being restrained and withstanding 2.0 G up, 4.5 G down, 3.0 G forward, 1.5 G aft,
and 1.5 G lateral accelerations. The tow tractor shall be equipped with pressure relief devices or
configured for air transport to prevent any part from becoming a projectile in the event of
catastrophic loss of aircraft cabin pressure.
3.25.1 Air transportable configuration. The air transportable configuration shall include all
equipment, ¾ tank of fuel, and no crewmembers. In this configuration, maximum weight shall
be 40,000 pounds, with a maximum single axle weight of 20,000 pounds. At least 6.0 inches
sidewall and 6.0 inches overhead clearance shall be maintained between the tow tractor and the
aircraft at all times during loading and flight. The restrained tow tractor shall allow for
loadmaster in-flight access from the front to the rear of the aircraft.
3.25.2 Equipment removal/reconfiguration. Preparation and restoration of the tow tractor for air
transportability shall take no more than 30 minutes for two persons using common non-powered
hand tools. All equipment removed shall be stored on the tow tractor; caps and plugs shall
permit driving and storage in transport configuration.
3.25.3 Tie down points. The tow tractor shall be symmetrically restrained during air transport.
Tie down points shall be rated at a minimum of 25,000 pounds, marked for capacity, with a clear
opening compatible with the appropriate devices. Each end of each tie down device shall
terminate at a tie down point and not pass through any other tie down point. There shall be no
interference between tie down devices and the tow tractor.
3.25.4 Shoring. The use of shoring to load the aircraft (referred to as approach shoring and step-
up shoring) and during flight (referred to as load shoring, parking shoring, and sleeper shoring) is
permitted, but not desired. However, the use of shoring, especially in loading the aircraft, is not
an alternative to good tow tractor design. The tow tractor shall be designed to the maximum
extent possible with adequate clearances to load onto the aircraft.
3.25.5 Removable Ballast. The use of removable ballast is permitted to bring the tow tractor
down to its maximum air transportable weight. Any one piece of ballast weight shall not weigh
more than 8,500 pounds, shall be of a size that permits it to be removed with a 10 K pound
forklift with 8.5" wide holes for 8" wide tines, shall be loadable onto one HCU-6/E 463L pallet
with maximum size 84" L x 104" W, and shall have tie down provisions in sufficient number and
located so as to be capable of being restrained to the pallet to a minimum of 3.0 G in the plane of
the pallet and 2.0 G normal to the pallet. The ballast shall present a load weight onto the pallet
surface (with shoring if necessary) that does not exceed 100 pounds/linear inch (C-5 roller
limit) or 250 psi pallet contact pressure. If removable ballast weight is incorporated to fulfill this
requirement, ballasts shall have their respective weights stencil painted onto each removable
piece.
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