Super 80 Professional – AOM
POWER PLANT
Section 22 Page 2
Super 80 Professional – Aircraft Operating Manual
Coolsky, 2018
GENERAL
The airplane is equipped with two axial-flow,
bypass, turbofan, Pratt and Whitney JT8D
engines, which have a normal static take-off
thrust rating of 20,000 pounds and a
maximum take-off thrust rating of 20,850
pounds.
The JT8D axial flow turbofan engine utilizes a
14-stage split compressor, a 4-stage split
turbine, a 9-can combustion chamber, two
integral accessory drive cases, and a full
length integral fan annular discharge duct.
An automatic reserve thrust (ART) system is
installed. In the event of an engine failure,
the ART system increases the thrust on the
remaining engine (not simulated).
Engine Starting
Either engine may be started by using a
pneumatic ground supply or by pneumatic
supply from the auxiliary power unit. When
one engine is operating, the opposite
engine may be started by using the
pneumatic crossfeed system.
An electrically controlled, pneumatically
actuated starter air shutoff valve on each
engine controls the starter of the respective
engine.
Ignition Systems
Two ignition systems, one 20-Joule (high
energy ignition system) and one four-Joule
(low energy ignition system), are provided
for each engine. An IGN (ignition) switch is
provided on the ENG panel for ignition
system selection.
IGN switch position:
OVRD
High energy ignition is supplied to
both igniters on both engines,
regardless of fuel lever and
engine starter positions.
CONTIN Low energy ignition is supplied to
a single igniter on the engine,
depending on fuel lever position.
With the engine starter switches in GND or
FLT, high energy ignition is supplied to both
igniters on the engine, depending on fuel
lever position.
Engine Oil System
Oil is pumped from the oil tank by the main
oil pump and delivered to the system
through an oil filter. Oil quantity is sensed in
the oil tank and displayed on the System
Display Panel.
Engine Fuel System
Fuel, from the fuel supply system, passes
through the engine driven first stage
centrifugal pump. From the pump, the fuel
flows through the air/fuel heat exchanger.
The fuel is then filtered before entering the
fuel control valve. The fuel may bypass the
filter if it becomes clogged. A fuel flow
transmitter measures fuel delivered from the
fuel control to the engine.