Figure 9-16. Towbar
· Do not tow a towbar unless the arms are
(4) Operating procedures. Consult
the applicable aircraft maintenance manual for detailed
guidance. The following general procedures pertain to
the operation of the towbar:
Connect towbar to aircraft.
Confirm that attaching pins are properly
Connect towbar to tow vehicle.
Tow aircraft to desired location.
Disconnect towbar from tow vehicle.
Disconnect towbar from aircraft.
operator inspections apply to towbars. Detailed
inspection requirements are contained in the applicable
Visual inspection. Look for broken
or loose hardware.
Aircraft attaching devices. Check
for proper operation.
Maintenance. Consult the applicable
maintenance manual for preventive and scheduled
Nitrogen Servicing Unit. The two-wheeled, hand
truck mounted nitrogen servicing unit, shown in figure 9-
17, is used to service aircraft nitrogen systems. The
cylinders are restrained on the hand truck by a chain.
The controls are mounted on the cylinders. The
assembly consists of an air chuck, an adapter and
valve, a hose, an air and nitrogen purifier cylinder, and a
high pressure oxygen regulator.
Purpose. The nitrogen servicing unit is
designed to recharge the nitrogen system installed in an
aircraft. The cylinders and flow controlling mechanism
can be easily wheeled to the aircraft by one person.
The aircraft system can be charged by a flexible hose.
Principles of operation. The cylinders are
manifolded together and can be used individually or at
the same time. The nitrogen flow is controlled by a
shutoff valve. The pressure regulator restricts the outlet