ENGINE MANUAL
IAE50R – AA
E1.01.05 – E
Issue date: 25.Jan.2018
Page: 13-4
Revision no: 9
13
COOLING SYSTEM
13.1
Liquid Cooling System
Coolant Level Check: Refer to Aircraft Manufacturer’s instructions.
In a fault free system, the coolant level will not alter significantly. Any unusual drop in the
coolant level in the tank indicates a fault in the system that must be rectified before further
flights.
13.2
Coolant leak check
Check all hoses for cracks, wear, security and leaks. (a white or light pink crust around a joint
is an indication of a leak!). Refer also to engine installer’s handbook. If a leak is found, replace
hose and hose clips, tighten hose–clips etc. as necessary and check / bleed / pressure test the
system as detailed below.
Check all bleeding points and, if visible without engine removal, all engine housings and
mating surfaces for leaks. Check water pump bleeding hole and engine bay for any coolant
residue. If any residue is found check engine until leak is found and contact Austro Engine
GmbH.
13.3
Coolant System Filling and Bleeding
This test should be done if leaks are suspected and after any
part of the coolant system has been disturbed and replaced.
This is a guide, any variations in the aircraft manual should
be followed!
1)
Slowly fill the system with the coolant mix
2)
Undo bleed plugs until fluid escapes, then tighten.
3)
Top up radiator header tank with coolant mix.
4)
Check for coolant leaks at all connections / interfaces.
In doubt fit a coolant pressure tester.
5)
If required fit a coolant system pressure tester (Blue Point No STV 262 or similar) to
the header tank and pressure test.
6)
Recheck bleed points for air after the first engine run.
7)
Repeat (6) until no further air is emitted from the bleed point(s) When running the
engine ensure that coolant temperature rise is slow and consistent with warm up and
