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ENG L/O pressure normal/low/shutdown
- Normal: 50-60 psi
- Low: 40 psi
- Shutdown: 20 psi
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GRBX L/O pressure normal/low/shutdown
- normal: 20-30 psi
- low: 15 psi
- shutdown: 10 psi
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TIT temp
- High: 2175 f
- Shutdown: 2250
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ENG fuel manifold pressure
- normal: 270-385
- shutdown: less than 60 psi @ 12225+ RPM
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ENG VIB
- normal: 0.5-1.5
- High: 3 mils for 3 seconds @ 12225+ RPM
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High Module temp
High 250+
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ENG RPM slow start
Less than 2400 RPM in 30 seconds
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ENG RPM underspeed
Less than 12225 RPM or stays at 12225 RPM for 3 seconds
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ENG RPM overspeed
Greater than 15800 RPM
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ENG PRI FO filter inlet pressure
- Normal: 50-70 psi
- High DP: greater than 5
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GEN L/O pressure
- Normal: 20-30 psi
- Low: 15 psi
- Shutdown: 10 psi
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GEN L/O temp
- Normal: 50-145 f
- High: 160 f
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GEN bearing temp
- Normal: 70-180 f
- High: greater 210 f
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GEN cooling air temp
- Normal: 50-140 f
- High: greater than 140 f
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GEN stator temp
High: greater than 120 °C
Indication of class Charlie fire
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GTRL
Remove load/stop GTG
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GTRO
Transfer control remote/local
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GTLT
Longitudinal tie breaker
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DGSW
Align and secure degaussing
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GTG rating
450V, 60HZ, 4009 AMPS, 2500 KW, 3 PHASE
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Run permissive
- 5% V
- 0.2 HZ
- 15% phase angel
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GTG anti-icing start
Less than 38°F and over 70% humidity
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GTG LO sump ENG
75 gallons
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GTG LO sump GEN
14 gallons
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GTG starter duty cycle
- 2 min on 2 min off
- 2 min on 2 min off
- 2 min on 30 min off
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Bleed air logic
14th stage bleed air valve stop opening and maintain position at 2145 F, when TIT is above 2175 F bleed air valve close
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GTG standby requirement
- GTSS alignments
- LOCOP and SWBD remote
- Voltage regulator DIFF
- governor ISO mode
- SWBD ready to start indicator illuminated
- Cooling fan REMOTE
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EPCC logic
If voltage at all 3 switchboards is below 330 VAC, EPCC attempt to remote start (most ready to start) GTG or start the lowest number GTG if there are multiple standby GTG's
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Load shed
- Stage one: 2750 KW for 100 milliseconds (non vital shuts off, ventilation, galley, general workshop)
- Stage two: 2500 KW after 5 seconds
- (A/C's, SPY anti icing and VLS anti icing )
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Reset load shed
- All breakers off
- Push switchboards load shed reset button
- Turn switchboards breakers on
- Turn load center breakers on (separately)
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How often does RIMMS motor when online and why?
Every 4 hours for bearing lubrication
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Reduction ratio (RGB)
7.967 to 1
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Overspeeding (high frequency, speed high, shutdown)
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Gearbox LO filter clogged
35 PSI
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Generator LO filter clogged
16+ PSI
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Post shutdown fire Generator
400°F after engine slows below 2000 RPM
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Post shutdown down fire RIMSS
750°F+ after engine stops
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Slow start auto shutdown
Less than 40 rpm/sec for 3 seconds at speed between 2400-12225 rpm
Speed does not reach 2400 rpm within 30 seconds of start
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Start overtemp auto shutdown
If TIT is more than specified limits at a speed below 12225 rpm
Limits change between 1600-1725 as speed changes
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Fail to fire auto shutdown
Less than 600°F within 10 seconds after engine speed is 2400 rpm
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Loss of fuel auto shutdown
Fuel manifold pressure is below 60 psi above 12225 rpm
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Reverse power (MFM 0)
125 KW for 100 MS, trips GB and possible load schedule (reset @ 0 KW)
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Forward current (MFM 0)
8000 amps trips GB and possible load schedule (reset @ 7600 KW)
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EPCC safeties
APD, synchro switch, load shed
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Deadbus
Below 330 volts
3 minutes for switchboard fire auto restarts affected GTG
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GTG mechanical safeties
- Shear pins
- Power take off
- Share points on ADH drive shaft
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EPCC logic (inport)
No voltage start forward most ready GEN automatically using RIMSS
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What safety shuts bleed air valve after 500 KW increase occurs?
Transient load sensor
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RIMSS idol speed
29,500 +/- 500
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