Break-In Procedure - Rotax 503 UL Operator's Manual

Section 5
5) Break-in procedure:
for aircraft installation (in other applications prcceed accoldingly)
Thobreak-inhas tobepcrtbrmed with drccngineinstalled, properlyloaded, i.e. propeuer installed,
matched for max. r,p.m. In case of an aircraft, anchor thc plane to the ground. Rutr the engine
according to the following graph:
Engine
r.F.m,
H | 0 0 0
,nta, f p.m.
(rcfer page 32)
2 0
5 0
s e c s e c
l 2
5
mln min min
t 0
sec
t 5
s e c
5 , 5
I
4,5
4
5 , 5
5
I
In. 6
^'
.
^'
T
0
r0
20
30 40 s0
60
illHi
h case of a f&g3L!!g:i!c it is possible that the cooling air flow on ground is not cnough to provide
the necessary cooling for a longcr period. Therefole it is necassary to observe carcfully the cylinder
hggl temperaturc (CHT) during breal in procedure to avoid overbearing. Beforc exceeding tie
maxiorum allowed CHT of 250 o C / 480 o F intenupt the run and cool down thc engine at idlc for
approximately one minute and continue where you have intefiupted.
Be sure to use a safe run-rp area- to anchor aircraft at those points approved by the airframe
manufacturer, and to have someone present who is able to shut off lhe engine instandy and to prcvent
unauthorizerl people entcring the duDger area.
Proper clorhing, ear plotection etc, should be used on any engine run-up test.
After this procedure the idle has to be adjusted. Then short take-offs can be conducted. After a few
short full-load take-offs, but not later than 2 hours total running rime, the cylinder head nuts have to
be rc-torqued to 22 Nm (195 in.lb.). For this procedurc the cylinder cowl (if any) has to be taken off.
I r I r | | l l
2
Engine must be cool for re-torquing of head.