Specifications

SECTION II
MODEL 560 AIRPLANE AND SYSTEMS
PNEUMATIC
GENERAL
An air bottle which provides for emergency extension of the landing gear and/or emergency braking is
located on the right side of the forward pressure bulkhead. The bottle is properly serviced at 1800-2050
PSI and can be checked on preflight by a gauge visible in the right forward baggage compartment. A relief
valve on the bottle will rupture at 4000 PSI if the bottle becomes overpressurized.
The bottle has outlets to the vent line, the gear auxiliary extension line, and the brake air pressure line.
In normal system configuration the landing gear auxiliary extension line is connected to the vent line through
the position of the control valve.
When the AUX GEAR CONTROL T-handle shaft is pulled, a valve is repositioned to direct air from the
bottle through the auxiliary extension lines to the uplock actuators to release the uplock hooks and then to
the extend side of the landing gear actuators.
Emergency braking is controlled through a manually operated three-way pressure regulating valve. Air
from the bottle is connected directly to the inlet port of the valve by the brake air pressure line. The outlet
port is connected to the brakes and, when the emergency brake handle is in NORMAL position, is vented to
an exhaust line. When the emergency brakes are applied, the vent is closed, the inlet port opens and high
pressure air is applied to the brakes. Releasing the emergency brake handle opens the vent, relieving
pressure. This allows modulation of the system to obtain the desired braking force. Each time the handle
is cycled some air pressure is vented overboard, reducing the emergency bottle supply.
Figure 2-15. Emergency Air Bottle Control Valve
I 56OMB-01 Configuration AA 2-29