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Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Chapter:
Issue:
Issue Date:
Page:
Content:
20-AMM-73-02
3
06.11.2013
8
10
Rev. No:
Rev. Date:
1
25.08.2014
Injectors
The Injectors are solenoid operation injectors actuated by the
FADEC. They inject the fuel out of the common rail into the
combustion chamber of each cylinder.
Fuel is fed from the high pressure connection, to the nozzle
through the passage, and to the control chamber through the
feed orifice which is opened by the solenoid valve.
With the orifice closed, the hydraulic force applied to the valve
control plunger exceeds that at the nozzle needle pressure
shoulder. As a result, the needle is forced into its seat and seals
off the high pressure passage from the combustion chamber.
When the solenoid valve is triggered, the bleed orifice is opened.
This leads to a drop in control chamber pressure and, as a result,
the hydraulic pressure on the plunger drops, too. As soon as the
hydraulic force drops below the force on the nozzle needle
pressure shoulder, the nozzle-needle opens and fuel is injected
through spray holes into the combustion chamber. This hydraulic
force amplification is needed because the necessary forces
cannot directly generated by the solenoid valve. The control and
leak-off fuel is quantities are returned to the fuel return.
See Figure 8.
Содержание Cessna 172
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