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IO-390-D Series Engine Installation and Operation Manual
and Requirements to Prepare the Engine for Installation
Issue
Oil Cooler
Oil pressure gage
Fuel supply hose
Propeller Shaft
Mounting
Air cleaner
Exhaust collector
External fuel filter
Step 3. Remove Components
It could be necessary to temporarily remove a component, to install the engine in its compartment on
the aircraft.
Remove only the components necessary to enable engine installation.
The component(s) will be re-installed after the engine is installed.
Step 4. Install Aircraft-Supplied Engine Mounts
The airframer is to supply rubber mounts and bolts for attachment to the conical engine mounts.
There are four mounting bosses integral to the crankcase.
Maximum Allowable Load for the Mounting Attachment and Structure
The conical mounts can withstand a 10 G load per FAA FAR requirements.
© 2020 Avco Corporation. All Rights Reserved
March 2020
Table 2 (Cont.)
Optional Equipment, Recommendations,
Recommendation/Requirement
Provision is made for aircraft manufacturer-supplied full flow oil cooler.
Oil flow through the cooler system will be approximately 7.5 gallons
per minute (28.4 liters minute) and heat rejection will not exceed 970
Btu per minute. The oil cooler must withstand continuous pressure of
150 psi (1034 kPa) and have a minimum proof pressure of 400 psi (2758
kPa). A thermostatic bypass valve and pressure relief valve are provided
as standard equipment. The pressure relief valve limits the pressure drop
between cooler connections to 35 psi (241 kPa). The valve closes at
185ºF (85ºC) routing all engine oil flow through the cooler. If pressure
drop across the oil cooler system is more than +75 psi (517 kPa) ±15 psi
(103 kPa), the pressure relief valve opens to bypass the cooler.
There is a provision for installation by the aircraft manufacturer for
installation of an oil pressure gage connection.
Correctly-sized hose for the fuel pump supply and return vent line back
to the airframe.
Conforms to specification AS127, Type 2.
Four mounting brackets for rear-type conical mounting, maximum load
5500 lb. (2495 kg). The front pads on the crankcase are also machined
to allow for bed-mounting of the engine.
Air cleaner at rated power is 1500 lb of air per hour; pressure drop not to
exceed 6 in. of water.
There is a provision for the airframer to install an exhaust collector.
Stainless steel or low carbon steel-type exhaust flanges are available as
optional equipment.
150 microns
Requirements for Engine Installation
Page 15
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