systems Flashcards
PTO -1
What are the sections of the engine?
Cold
Hot
Accessory
Power Turbine
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What are the two mechanical inputs to the HMU?
PAS (power available spindle, connected to PCLs)
LDS (load demand spindle, connected to collective)
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Functions of HMU
Pumps fuel at high pressure
Meters fuel to ODV
NG and fuel flow limiting
Positions variable guide vanes
Positions start bleed valve
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Oil Tank Capacity
7 US Quarts
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How does the oil cooler work?
Oil is cooled by transferring heat from the oil to the fuel.
Liquid to liquid.
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Functions of ODV
Primes/sends fuel to main fuel manifold
Purges fuel from main fuel manifold on shutdown
Shuts off fuel when NP Overspeed sensed by EDECU
Shuts off fuel when Hot Start sensed by EDECU
PTO -1
When does the impending bypass indicator thermal lockout engage?
Below 38 degrees C
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Engine Alternator Functions
Ng signal to the cockpit
Power to ignition exciter
Power to EDECU
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Engine A/I One Q loss per engine
20%
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At what NG does the engine anti-ice start bleed valve close?
88-92% NG
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Engine Inlet Anti-Ice System
When will the advisory illuminate?
When the inlet temperature reaches about 93 degrees C.
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Engine Inlet Anti-Ice System
How is the system controlled?
By ambient sense port.
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Engine Inlet Anti-Ice System
Temperature Ranges
Above 13 C - illumination of advisory indicates a system malfunction.
Range 4-13 C - may or may not illuminate
At 4 C and Below - failure of advisory to appear in flight indicates a system malfunction
PTO -1
Engine anti-ice and engine inlet anti-ice valves failing to the open position power reduction.
Up to 20% Q per engine.
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What drives the compressor?
Gas generator turbine
PTO -1
What is the Power Turbine connected to mechanically?
High Speed Shaft
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How many stage compressor?
Five stage
During engine start, when will ignition stop?
Either the ignition key lock is turned OFF or starter drops out
What type of ignition system do we have?
non-continuous
AC powered
capacitor discharge
low voltage
What kind of starter do the engines have?
Pneumatic
What three sources are there for engine start?
Crossbleed
APU
Ground source
Describe valves during a crossbleed start
Air SRC switch - ENG (both engine cross bleed valves will open
Pressing start button for engine not operating - start valve opens, cross bleed valve closes
What are the two LRBs on each pump for? What do they do?
Pressure filter
Return filter
They protect the pump from high pressure in the return system, they will pop when pressure is exceeded.
What is the depressurizing valve in the backup pump module for?
It reduces the output pressure of the pump upon startup of the electric motor. It unloads the electric motor by reducing torque requirement at low RPM. Reduces the current demand during backup system startup.
PTO -1
Built-In Forward Tilt
3 Degrees
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Freewheel Unit Definition
Allows engine disengagement during autorotation, or in case of an inoperating engine, the accessory module will continue to be driven by the main rotor.
PTO -1
Transmission Accessory Module Definition
Provides mounting and drive for an electrical generator and a hydraulic pump.
PTO -1
Which sensor is mounted on the right accessory module?
Rotor speed sensor, provides signals for the EICAS and PFD power pod displays.
PTO -1
Which sensor is mounted on the left accessory module?
Rotor speed sensor, provides input signals to the EDECU for improved transient droop response.
PTO -1
Left Accessory Module Sensor
Oil Pressure Switch (farthest point from the pumps, it activates MAIN XMSN PRESS caution)
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When does MAIN XMSN OIL HOT caution illuminate?
Transmission oil temperature reaches 140 degrees C
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How many chip detectors are there?
5
Left Input
Right Input
Left Accessory
Right Accessory
Main Module
PTO -1
Which chip detectors incorporate a self-sealing provision so that it can be removed for visual inspection without loss of oil?
All except main transmission module
PTO -1
When is fuzz burn-off disabled?
When oil temperature reaches 140 degrees C
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Which chip detector has a 30-second time delay?
Main Transmission Chip Detector
PTO -1
What sensors do the intermediate gear box and tail rotor gear box have?
Chip Sensor
Temperature Sensor
PTO -1
How many viscous-dampened bearings are used to suspend the shafts?
Four
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How many sections of drive shaft connect the main transmission to the tail rotor gear box?
Six
PTO -1
Where is the sensor that illuminates the MAIN XMSN OIL HOT light?
Aft and right of the main XMSN - facing rotor
(main XMSN oil temp switch)
It is right where the oil cooler inputs to the main module.
PTO -1
Where is the sensor that gives the temperature gauge (tape) readouts for main transmission?
Bottom of transmission incorporated with Main XMSN Chip detector.
Between the sump and the pump
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When the GEN BRG FAIL caution illuminates for more than 1 minute what must be done?
Make an entry on the appropriate maintenance form.
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Main Generators Rating
115/200 VAC
40/60 kVA
400 Hz
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AC/DC Converters Rating
400 ampere
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Electrical power source hierarchy of priority
Either No 1 or No 2 Main Generator
APU Generator
External Power
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DC Batteries Rating
24 volt
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Primary AC Power System Delivers what?
regulated three-phase
115/200 VAC
400 Hz
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Generator kVA Rating
40/60
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What are the generators mounted on and driven by?
Transmission Accessory Module
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Generator Control Units Job
-Underfrequency Protection (ground ops only and main gens only)
-Undervoltage Protection
-Overvoltage Protection
-Feeder Fault
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Auxiliary APU Generator Rating
115/200 VAC
35 kVA
400 Hz
3 Phase
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APU Generator
How is it cooled?
Air cooled
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What do the converters convert from to?
Change power from 115/200 VAC
into
28 VDC
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External Power Monitor Panel
Undervoltage Protection
Overvoltage Protection
Underfrequency Protection
Over frequency Protection
Correct Phase Rotation
With only APU Gen as sole source of AC power what can we not operate?
blade de-ice
How is DC power supplied primary and secondary?
Two converters
Two batteries are secondary power source
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Fuel Flow from Supply
From Fuel Supply
Fuel Boost Pump
Fuel Pressure Sensor
Fuel Filter (Bypass Relief Valve, Impending Bypass Indicator Button, and Differential Pressure Switch)
HMU
Oil Cooler
ODV
Fuel Injectors
PTO -1
Engine Driven Boost Pump is what kind?
And why?
Low Pressure Suction Pump
Ensures supply system is under negative pressure, lessening the potential of fire in case of fuel system damage.
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Which fuel lines are self-sealing?
All except the APU fuel line
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What is the capacity (in gallons) of each fuel tank?
322
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How are the fuel boost pumps operated?
Electrically
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Why should use of Boost Pump operation be limited?
To minimize helicopter operation with pressurized fuel lines.
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During fuel dump, which pump operates?
Both simultaneously.
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When pressure refueling, which tank will fill faster?
The No 1 tank. An imbalance of up to 1200lbs is possible if both are not refueled to the full level.
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When aerial refueling, which tank will fill faster?
The No 2 tank. An imbalance of up to 1200lbs is possible if both are not refueled to the full level.
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Gravity Refueling
When will the high-level sensor illuminate the light next to the gravity fill port?
When the fuel level in the tank reaches approximately 312 gallons.
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Fuel Quantity Indications Limitations
Fuel quantity indicator latency may take up to 60 seconds to stabilize. Indicated fuel quantity may lag by as much as 600lbs.
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When will the MAIN FUEL tape and digital readout (along with the TOTAL digital readout) turn yellow?
Below 300lbs
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When will fuel dumping stop?
When the switch is placed to OFF
Or when either left or right tank reaches the actual stand pipe that prevents fuel dump below 250lbs per tank.
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Which tank is the APU fed from?
Left main fuel tank
