18
SAFIR 5L
OPERATION AND ATTENDANCE MANUAL
PG 01-31
rpm
% min
-1
110
100
90
80
70
60
50
40
30
20
10
0
56650
51900
46400
41200
0
5
10
15
20
25
30
35
40
45
50 100 200 300 400 500
600
Time
s
1.
Initiation of the start APU after switching on of the power supply circuit by switching on the relevant breakers and
switches "RUN" and push down the "START BUTON"
2.
Ignition of fuel in the combustion chamber
3.
Start of electronic control function
4.
Attainment of sub-speed (80 %)
5.
Attainment of idling (89 %)
6.
Reaching operating speed (100 %), cold and hot start of the main engines
7.
APU cut-off by pilot, after finishing the main engine starting, by switching off the switch „DELAY STOP“
Reaching idle (89 %), and two minutes waiting at idle in order to cool the turbine
8.
Automatic shutdown of the APU running.
9.
Stop the APU rotor
Minimum total running time APU which is necessary for the successful launch of the two main engines is five minutes.
Immediate interruption of the function APU is possible to switching off the switch "EMERGENCY STOP"
APU start, operation and switch off
permissible range of the speed APU
Fig. 6. Timing Behavior of APU Start and Operation
2
3
4
5
6
7
8
9
10
1
