19
SAFIR 5L
OPERATION AND ATTENDANCE MANUAL
PG 01-31
1.
APU switch off resulting from inadequate signal level of the speed transmitter
or from a speed transmitter circuit failure
2.
APU switch off resulting from failure to achieve exhaust gas temperature of 150
o
C (302
o
F)
(no ignition of the combustion chamber) within 13 s after the start
3.
APU switch off resulting from failure to achieve APU sub-speed within 35 s
4.
APU switch off after 35 s resulting from low oil pressure
5.
APU switch off resulting from reaching over-speed
6.
APU switch off resulting from decrease of APU speed bellow the lowest permissible value
7.
Decrease of oil pressure during APU operation after 35 s timing
8.
End of pressure switch bridging (14 s) and interruption of the APU function resulting from low oil pressure
APU start, operation and switch off in the Idling Mode
APU start, operation and switch off in the 100 % Speed Mode
permissible range of speed
Fig. 7. Timing Behavior of APU Protective Circuits
