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SAFIR 5L
OPERATION AND ATTENDANCE MANUAL
PG 01-31
APU operation cut off due to APU rotor overspeeding
Board network voltage
is correct
TEST
Check EC is
confirmed
Check system
feeding
Replace EC
Check if RFF is clean,
check if JV serviceable
Clean RFF and/or JV
Replace JV
Check free passage of
reverse fuel flow pipe
Replace BFS
Perform the checks error messages the EC via
PC, RS232 interface on a COM port and
software "SAFIR Monitor"
Error messages the EC-
exceeding of the overspeed-
The operating APU
speed exceeds the set limit.speed.
NO
NO
YES
YES
NO
YES