Flight Controls - Beechcraft C-12C Operator And Technical Reference Manual

2-43. FERRY FUEL SYSTEM.
The ferry fuel system is installed in the
aircraft for the specified ferry flight only.
a. Ferry Fuel System. The ferry fuel system
consists of two 120-gallon aluminum fuel tanks, a ferry
fuel system control assembly, and a 115-cubic foot
oxygen bottle. The ferry fuel tanks each contain an
electric rotary pump and a manual wobble pump for
pumping fuel to the nacelle tank. The fuel tanks are
mounted on the left and right side seat tracks on each
side of the cabin, the fuel control assembly is mounted
across the aisle directly behind the pilot and copilot
seats, and the add on oxygen bottle is mounted on the
aft baggage compartment floor. Permanently installed
provisions for connecting the ferry fuel system to the
nacelle tank are included in the fuel system.
provisions consist of manually operated shutoff valves
in each wheel well, a fuel drain, and fuel lines which
are routed from each wing to the nacelle tank. The
fuel drain, located on the underside of the wing center
section adjacent to the fuselage, should be drained
after each use of the ferry fuel system. The ferry tanks
are connected to fuel lines that lead to the nacelle
tank.
b. Ferry Fuel Transfer.
CAUTION
When ferry fuel is transferred with the
aircraft pressurized, the ferry fuel will be
transferred rapidly due
pressure differential. The rapid transfer of
fuel occurs when any ferry fuel tank
selector valve and any aircraft fuel tank
selector valve is open and doesn't require
operating either the electric fuel pumps or
the manual wobble pump.
check valve in the surge tank, marked IN,
equalizes the cabin pressure and the air
pressure over the fuel in the ferry fuel
tanks. Opening the selector valves, as
2-44. DESCRIPTION.
The aircraft's primary flight control system
consists of conventional rudder, elevator and aileron
control surfaces. These surfaces are manually
operated from the cockpit through mechanical linkage
using control wheels for the ailerons and elevators,
and adjustable rudder/brake pedals for the rudder.
Both the pilot and copilot have flight controls. Trim
control for the rudder, elevator and ailerons is
NOTE
to the cabin
The one-way
Section V. FLIGHT CONTROLS
noted above, opens a path for the fuel to
the main aircraft fuel tanks, which have
only ambient pressure over the fuel. Cabin
pressure will force the fuel out of the ferry
fuel tanks into the aircraft main fuel tanks,
i.e., from the pressurized area into the
unpressurized area.
Transfer of fuel from either of the ferry fuel
tanks first will not affect the aircraft center
of gravity.
(1) In preparation for transfer of fuel from the
ferry fuel tanks to the nacelle fuel tanks, use fuel from
both nacelle fuel tanks until each is about half full.
Open the desired ferry fuel selector valve and open
either or both fuel tank selector valve(s).
The
If either of the aircraft fuel tanks seems to
be nearing the full mark before the other,
discontinue fuel transfer and level the
tanks in accordance with the approved
Pilots' Operating
resuming fuel transfer again.
(2) Turn on either or both ferry fuel pump(s)
to transfer fuel to the nacelle fuel tank(s). Monitor the
quantity of fuel in the nacelle fuel tanks and
discontinue ferry fuel transfer when the nacelle fuel
tanks near the full mark to prevent venting fuel
overboard.
(3) Observe the fuel-flow sight gauge in the
line from the ferry fuel pump to the fuel tank selector
valves for air bubbles.
appear in the sight gauge, you may assume that the
selected ferry fuel tank is empty. As each ferry fuel
tank reaches empty, close that selector valve and
either select the other tank and/or turn off the transfer
pump(s). When the ferry fuel system is depleted,
securely close all selector valves and turn off the
transfer pumps.
accomplished through a manually actuated cable-drum
system for each set of control surfaces. The autopilot
has provisions for controlling the position of the
ailerons, elevators, elevator trim tab, and rudder.
Chapter 3 describes operation of the autopilot system.
2-45. CONTROL WHEELS.
a. Elevator And Aileron Control Surfaces
C D1 . Elevator and aileron control surfaces are
TM 1-1510-218-10
NOTE
CAUTION
Handbook before
When air bubbles begin to
2-61