SC-POH-1-1-17
Revision: -
Date of issue: 2011-09-01
SECTION 4
NORMAL PROCEDURES
S
S
p
p
o
o
r
r
t
t
C
C
r
r
u
u
i
i
s
s
e
e
r
r
4-6
13. Other switches
- ON as necessary
14.
CHOKE
- gradually release during engine warming up
15. THROTTLE
- maintain max.
2,500 rpm
for warming up
CAUTION
x
The starter should be activated for a maximum of 10 sec, followed by 2 min
pause for starter cooling.
x
As soon as engine runs, adjust throttle to achieve smooth running at approx.
2,500 rpm. Check the oil pressure, which should increase within 10 sec.
Increase the engine speed after the oil pressure has reached 29 psi and is
steady.
x
To avoid shock loading, start the engine with the throttle lever set for idling or
10 % open at maximum, then wait 3 sec to reach constant engine speed before
new acceleration.
4.2.3 Engine warm up, Engine check
Prior to engine check block the main wheels using chocks. Initially warm up
the engine to
2,000 rpm
for approximately
2 min
, then continue to
2,500 rpm
till oil temperature reaches
122 °F
. The warm up period depends on ambient
air temperature.
Check both ignition circuits at
4,000 rpm
for Rotax 912 ULS. The engine
speed drop during the time either magneto switched OFF should not exceed
300 rpm
. The max. engine speed drop difference between circuits
L
and
R
should be
115 rpm
.
NOTE
Only one magneto should be switched ON (OFF) during ignition magneto check.
Set max. power for verification of max. static engine speed
(5,000 ± 100 rpm)
with given propeller and engine parameters
(temperatures and pressures)
.
Check acceleration from idling to max. power. If necessary, cool the engine at
IDLE
before shutdown.
CAUTION
The engine check should be performed with the aircraft heading upwind and not on a
loose terrain (the propeller may suck grit which can damage the leading edges of
blades).
