AE50R, AE50RA
AE50RAB
Engine Manual
Doc. No. E1.01.0-E
Rev. 6 10-March-2011
Page 13-1
13.0 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 Hose Inspection
Check all hoses for cracks, wear, security and leaks (a white crust around a hose joint is an
indication of a leak!). Refer also to engine installers 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:
13.3 Coolant System Filling and Bleeding
NOTE !
This test should be carried out if leaks are suspected after any
part of the coolant system has been disturbed.
NOTE !
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.
If 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
no sudden temperature jumps occur. If the coolant temperature suddenly rises then
there will still be entrained air in existence and the cycle must be repeated.
8)
Top up header tank with coolant mix. Refit the filler cap and wire lock if appropriate.
9)
Fill the overflow tank with coolant mixture within the MINIMUM and MAXIMUM levels.
10)
Carry out full engine ground run.
