Velká Bíteš Turbojet Engine TJ20A Operation And Maintenance Manual - page 18
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RC FAILS
Loss of RC signal during engine run will set 45:FAILS-THROTTL
speed for the 44:FAILS-TIME period and, after this period lapses, the
engine switches off.
TIME
Failure to reach idle speed (IDLE) since the engine start beginning. If
the engine fails to reach IDLE within 60 s after the start, starting is
terminated.
LOW BATT
Low battery voltage. Upon battery voltage drop below 10 V in STOP
mode, TEST mode, and START mode, the engine switches off
immediately. Upon battery voltage drop below 9 V
in Engine Run mode
and in COOL mode the engine switches off immediately.
HIGH BATT
High battery voltage. Upon battery voltage rise over 15 V
,
the engine
switches off immediately.
BAD STARTER
Failure of starter during device test or engine start
BAD GLOW
Failure of heater plug during device test or engine start
BAD PUMP
Failure of fuel pump during device test or engine start
BAD EGT
Failure of exhaust gas temperature sensor during device test or engine
start
MAX EGT
High exhaust gas temperature during engine start and run.
Should temperature during engine start exceed the value 39: START-
EGTOFF for a period longer than 3 seconds, the engine switches off.
Should temperature during engine run exceed the value 3A: RUN-
EGT-OFF for a period longer than 3 seconds, the engine switches off.
MIN RPM
Speed drop during engine run. Should the engine speed drop bellow
25,000 rpm, the engine switches off.
In device test or engine start modes, it may be caused by starter or
clutch malfunction.
OVER RPM
Overspeed during engine run. Should the engine speed rise over
124,000 rpm, the engine switches off.
GENERAL ERROR Electronics malfunction Restart the engine (switch the engine power
supply off and on again) or, if engine restart does not help, reset the
engine (in Menu 6: RESET-ENGINE) back to the factory settings.
If the engine is in modes TEST, FIRE, START (engine start), or COOL (engine
aftercooling), do not perform any operations by means of EDT!!!