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TEO-540-A1A Engine Installation and Operation Manual
Air Induction System
The Air Induction System is integral with the oil sump, with individual induction pipes going to each
cylinder. Each passage in the induction system, where fuel and air mix, self-drain to prevent liquid
lock in the cylinder.
Induction air coolers are installed between each compressor outlet and throttle body inlet. Refer to
the curve in Appendix A for cooling airflow vs. pressure drop for each induction air cooler.
Minimum requirements are 4 in. of water cooling.
The Air Induction System must have an aircraft-supplied air cleaner that operates with a pressure
drop not to exceed 6 in. of water. Additional air cleaner capacity is necessary to operate under dusty
conditions. The Compressor Inlet Pressure (CIP) sensors must be installed in a common intake
plenum after the aircraft induction filter.
Turbocharger System
This engine has two turbochargers, one on each side. The EECS controls the induction manifold air
pressure (boost) using power control (throttle) position and regulation of the amount of exhaust gases
supplied to the turbine wheels.
The EECS monitors induction manifold air pressure and transmits the control signal to the electronic
two-way solenoid valve. The electronic two-way solenoid valve controls oil pressure to the exhaust
bypass valve's hydraulic actuator. The exhaust bypass valve controls exhaust gas flow to the turbine
wheels.
Intercoolers, one for each turbocharger, decrease the temperature of the compressed air before it
enters the throttle body.
The turbocharger outlet pressure is monitored and controlled automatically as a function of engine
speed, power setting, and altitude. An electronic valve controls oil pressure to the wastegate actuator
and the boost.
The turbocharger supplies air for cabin pressurization through sonic nozzles. Refer to Appendix A
for approximate cabin airflow for each sonic nozzle.
Accessory Housing/Accessory Drive Pads
The accessory housing is a machined aluminum alloy casting attached to the rear of the crankcase on
top of the oil sump.
There are three AND20000-type accessory drive pads on this engine. Refer to Table A-3 in
Appendix A for technical details.
There are two idler gears inside the accessory housing.
Lubrication System
The wet sump pressurized Lubrication System (Figure 9) has the following:
• Oil pump
• Oil sump
• Oil collectors
• Oil cooler
(supplied by airframe manufacturer)
• Oil filter
© 2018 Avco Corporation. All Rights Reserved
October 2018
• Oil pressure relief valve
• Oil cooler bypass valve
• Oil scavenge pump
• Electronic oil temperature sensor (OIL-T)
(on accessory housing)
• Electronic oil pressure sensor (OIL-P)
(on accessory housing)
System Description
Page 11
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