Break-In Procedure - Rotax 447 UL SCDI Installation Manual

21)

Break-in procedure

for aircraft installation (in other applications proceed accordingly)
The break-in must be performed with the engine installed, and properly loaded with
matched propeller for max. R.P.M. In case of an aircraft, anchor the fuselage to the
ground. Run the engine according to the following graph:
engine
rpm x
1000
max. rpm
refer to OM
5,5
1
5,0
4,5
4,0
3,5
5
3,0
2,0
1
1,0
0
fig. 54
On a liquid cooled engine it is possible that the cooling air flow (speed) on ground is
not enough to provide adequate cooling for extended periods of time. Therefore, it is
necessary to observe carefully the temperature of the cooling liquid during break-in
procedure to avoid overheating. Before exceeding the maximum allowed cooling
temperature on cylinder head (outlet) of 80
down the engine at idle for approximately one minute and continue the run from where
it was interrupted.
On a free air engine it is possible that the cooling air flow on ground is not enough
to provide the necessary cooling for extended periods of time. Therefore, it is
necessary to observe carefully the cylinder head temperature (CHT) during the
break-in procedure and avoid overheating. Before exceeding the maximum allowed
CHT of 250
approximately one minute and continue the run from where it was interrupted.
Effectivity: 447 UL SCDI, 503 UL DCDI, 582 UL DCDI /mod. 99
AIRCRAFT ENGINES
INSTALLATION MANUAL
10 15
sec sec
1
5
5
5
1 1 1
10 20
O C / 480 O F interrupt the run and cool down the engine at idle for
20 30
sec sec
5
5 5
1 1
30 40
O C/180 O F interrupt the run-in and cool
1 2 3
min min min
5
5
1 2
1
50 60
time (min.)
02854
page 21 - 1
Initial issue, May 01/99