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40 Cards in this Set
- Front
- Back
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What Voltage is the AW139 Electrical Sytem?
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28VDC
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How many Electrical systems are on the AW139?
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2, LH & RH
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What 6 components comprise each electrical system on the AW139?
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6 Components
1. Generator/Starter 2. Battery 3. Essential Buss ESS 4. Main Buss - MAIN 5. Non-Essential Buss - NON ESS |
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What Battery is associated with the LH Electrical System on the AW139?
The RH System? |
LH Electrical System = Main Battery
RH System = Aux Battery |
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What is the purpose of the Battery Buss on the AW139?
What Battery is it supplied by? |
Battery Buss - To supply power to the On-Board recorders
CVR FDR CMC It is supplied by the AUX BATT |
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How are the ESS Busses protected so that they cannot feed any other buss?
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Diodes and Circuit Breaker in case of short circuit.
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Are the Main Buss 1 & 2 Interconnected?
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Main Buss 1 & 2 are normally Isolated from one another. A Buss Tie Contactor K 10 is energized to connect them.
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Where is External Power connected the busses?
What Busses are powered when External Power is connected? |
Eternal Power connected to the Main Buss 1
All of the busses are powered when External Power is connected. |
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How are the remaining busses powered when External Power is provided to Main Buss 1?
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-Ext Power Main Buss 1 to main buss 2 through Buss Tie Contactor K10
-Power from Main busses to respective Essential Busses through protection diodes - Power to Non-ESS busses through K7 & K8 Contactors energized when EXT PWR Switch Engaged |
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What power are the 2 Starter Generators in the AW139
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9KW
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What respective busses are Gen 1 and 2 Connected to?
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Generator # 1 is connected to Main Buss 1
Generator # 2 is connected to Main Buss 2 |
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How are the Starter Generators cooled?
What affect does this have on electrical performance? |
Generators are cooled by a Mechanically driven fan.
This method limits the load as Hp (Pressure Altitude) Increases and is Placarded |
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How many GCU GCU's are there on the AW 139?
Where are they located? What functions do they control? |
2 GCU's
Located : Aft Avionics rack in the Cargo Compartment . Control : Voltage Regulation, Starter Generator Mode & Line Contactor Control |
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What Protection Functions do the GCU's Provide?
What two conditions do they monitor? |
Protection : OverVoltage/UnderVoltage , Reverse Current and Overcurrent (Short Circuit)
They Monitor External Power and Starter Speed for mode switching |
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At what speed does the starter mode disengage and the become a generator?
What Controls this? |
49-50% NG
GCU monitoring the speed sensor on the starter. |
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What type of batteries are installed in the AW139?
What amperage? |
2 Nickel Cadmium Batteries
44Ah Main and 28Ah Aux |
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What functions is the Main battery utilized for?
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Starting
ESS Busses & Main Buss During Dual Gen Failure or on ground with no Ext Power available/Connected |
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What functions is the Aux Battery utilized for?
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ESS Busses during Engine Start or During Dual Generator Failure or on ground with no Ext Power Available
Power the Battery Buss for CVR, FDR and Central Maintenance Computer (CMC) |
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Can the Batteries be online while the External Power is connected?
What Controls this? |
Need Info when how why...
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How long must the Aux Battery remain connected after power is removed or the aircraft is shutdown?
Why? |
5 Minutes
To successfully shutdown the Data Recorders CVR/FDR & CMC |
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What are the PDP's
How many of them are there? Where are they located? |
PDP - Power Distribution Panels
There are 2 (1 and 2) They are located in the Forward Portion of the PAX Cabin Center Overhead |
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What is the purpose of the Shunts in the AW 139?
How many are there? |
The Shunts sense the load being drawn by the aircraft total electrical system and display the Load on the Indicators.
There are 4 |
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What is the function of the DC current Transformers?
How many are there? |
DC Current Transformers sense the DC current flowing to the busses and pass a signal to the GCU to de-energize the contactor in case of an overload or short circuit.
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Where are the Shunts and DC Current Transformers located?
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In the top of the aft avionics bulkhead in the cargo compartment.
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What is functions are associated with the External Power Receptacle ?
Is the Long Nose and Short Nose Different? |
External Power Door open switch with associated CAS Message
Yes. Long nose has an Ext HeadSet Jack as well as ICS PTT and a circuit breaker for the External Power Contactor. |
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What is the function of the PDP's?
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It contains all the contactors controlled by the GCUs for power distribution form batteries and generators and external power.
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What busses does the #1 Overhead Circuit Breaker Panel Control?
What Side of the cockpit is it on? |
#1 CB Panel Controls the ESS, Main, Non ESS Busses
It is on the LH Side |
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What busses does the #2 Overhead Circuit Breaker Panel Control?
What Side of the cockpit is it on? |
# 2 CB Panel Controls the ESS, Main, NON ESS Busses as well as the BATT Buss
It is on the RH Side |
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What is the function of the ESS BUSS TIE Circuit Breaker?
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It interconnects the Flight ESS Busses and protects against short circuit in one damaging the other.
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How are the Flight ESS Buss Circuit Breakers Labeled?
Main Buss? Non ESS Buss? |
Single Squares either Side of the breaker [ O ]
Double Squares = O = No Markings either side of Breaker O |
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What are the functions of the 3 positions on the Buss Tie Contactor Switch?
ON Auto RESET |
ON - Main Buss 1 & 2 Interconnected
Auto - Buss Tie Contactor and Main Busses controlled by CGU Reset - Overrides Short Circuit Logic that is Preventing Closed condition |
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What is the Function of the GEN 1 or 2 Switch
ON OFF |
ON Requests GCU close Generator Contactor either
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When the Master Battery Switch is set to ON
What relays Energize? What Busses are connected to the Batteries? |
Master Battery to ON:
Relays K1 and K2 are energized . Power is supplied the #1 and #2 Flight ESS Buss |
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When the MAIN BATTERY Switch is set to ON
What Relays Energize? What Buss is connected to the Battery? |
Main BATT ON:
Contactor K3 is energized The Main Battery 24VDC is applied to the MAIN BUSS #1 |
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When The AUX BATT Switch is set to ON
What Relays Energize? What Buss is connected to the AUX BATT? |
AUX BATT ON:
Contactor K4 is Energized The AUX Battery is connected to the MAIN BUSS #2 but the CR5 Diode only allows the Battery to be charged from MAIN BUSS 2 not to Supply it. So, MAIN BUSS 2 is NOT Energized |
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With the Engines not running, What is the purpose of setting Gen 1 & 2 Switches to on?
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GEN 1 & 2 Switches ON (Engines OFF)
Sets GCU to Monitor Speed Sensor in starter to Energize the Generator contactors when conditions are met. |
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What Contactors are energized to apply the Generators to the Busses?
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Generator Contactors
K5 & K6 |
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What is the Minimum Buss Voltage Prior to Start in the AW139?
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23VDC
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What contactor is the Buss Tie Contactor?
Why is it set to on Prior to # 2 Engine Start on Batteries? |
Buss Tie Contactor = K10
K10 is energized prior to starting #2 Engine to allow Battery Voltage/Amperage from Main Buss 1 to be interconnected with Main Buss 2 for Engine Starting |
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What Contactors are controlled by the Master Battery Switch?
What Busses are Energized when MASTER BATT is ON? If MAIN BATT & AUX BATT are set to ON what additional Busses are energized? |
Master Battery Contactors K1 & K2
Without Main Batt & Aux Batt Switches ON then only the Flight ESS Buss 1 & 2 are energized. Main Buss 1 Will be powered by MAIN BATT thru Contactor K3 but Even though K4 will be energized for AUX BATT the Main Buss 2 will not be energized unless the K10 Buss Tie Contactor is energized due to CR5 in the AUX BATT circuit. |
