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28 Cards in this Set
- Front
- Back
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Describe the various sources of electrical power available to the C130J |
1. Two Batteries 2. Four engine-driven Generators 3. AC External Power 4. APU Generator |
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What sort of electrical power do the aircraft batteries generate? |
24 Volt 35 Ampere-hour DC |
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Name the circuits each battery supply |
1. Utility Battery bus & Isolated DC bus 2. Avionic Battery bus & avionic DC bus |
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In sub zero operating conditions, what consideration would you have with regard to preserving battery strength? |
1. You would consider removing the batteries and storing them somewhere warmer. 2. The stronger battery should be used as the Utility battery for the APU start |
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List the battery voltage limitations |
1. The batteries should be at 24v 2. A battery can be used if >22v as full charge can be achieved in 30 mins from aircraft ac system. 3. <22v =battery change |
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How do the batteries get charged in the aircraft? |
1. Utility Battery from the ESS DC bus 2. Avionic Battery fm the MAIN DC bus |
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How can you determine the voltage being produced from the batteries? |
Battery Test Switch digital DC Voltmeter |
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Where can you monitor the electrical system parameters? |
HDD Systems Status page |
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Which buses are powered by the successful connection of an External AC Power source? |
1. LH AC 2. RH AC 3. Main AC 4. Essential AC |
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State the output generated by a GPU, as required by the C130J |
1. Min 40Kva 2. 115v - 400Hz - 3 phase AC |
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With the APU Generator on line what buses are supplied AC power? |
Essential & Main AC Buses
note: Regardless of on/off condition of other Gens the APU Gen (if on line) will always feed the Essential AC bus |
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What output is generated by each Engine Generator? |
40/50Kva. 115v, 400Hz, 3 phase AC |
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Name the 6 AC Buses within the AC Electrical system |
1. LH AC 2. RH AC 3. Essential AC 4. Main AC 5. Essential Avionics AC 6. Main Avionics AC |
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Describe the Engine Generators and how they feed the AC Electrical system |
1. Engine Driven, Oil Cooled, from the Gearbox mounted Acc drive (GMAD) 2. 1 Eng Gen will supply Main & ESS AC Buses 3. 2 Eng Gen will supply Main, ESS, LH & RH AC Buses |
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How does the Electrical system create single phase AC electrics? |
2 x 115v single phase AC inverters from the Avionics DC bus & Isolated DC bus provide AC to Main & ESS AC Buses |
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In addition to 115v Single phase AC, what other AC is provided by the AC inverters? |
26v AC for certain Emergency Sensors and UHF/VHF DF |
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Can both the APU and GPU power the aircraft at the same time? |
No. Interlocks prevent this occurrence |
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To achieve full electrical sustainability what configurations of AC power supply must be available? |
1. External AC Power supply Only 2. 2 x Engine Generators (min) 3. APU + One Engine ? |
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With External Power provided, how are the batteries charged? |
Provides the BTRY switch is selected ON the Batteries are charged via the DC buses, which receive their supply via TRUs |
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When switching from External to APU power, or to Engine Generator power. How does the system prevent momentary surges/power loss? |
The aircraft has a holding relay that lasts approx 2 seconds to enable the system to settle |
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How do you know if you have External power available to the aircraft? |
AC Ext Power-On Indicator Light illuminates when the correct 3 phase ext power is connected |
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What forms of circuit protection does the aircraft have and where can you find it? |
Mechanical CBs - Various Locations (High Load Equipment) Electrical CBs - Comm/Nav/ECB Panel (CNBP) |
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ECBs - What conditions may you see an ECB set in? |
Pulled, Open, Strapped, Tripped, ? |
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In the event of a major loss of power, how long should the batteries provide emergency electrical power? |
Max 30 minutes to provide for an IMC to VMC landing |
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With the loss of all generators in flight what is going to happen in the cargo compartment which may raise alarm? |
All the Troop Oxygen will deploy! |
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In the event of a total generator failure what could be an implication of attempting to start the APU in flight? |
A failed start will result in reduced battery life remaining afterwards. Therefore a decision needs to be made wrt the risk vs requirement |
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In the event of a total generator failure, what radios are available to the crew? |
With no ICS available, only the GYH control is available to select VHF1 & UHF1 freqs |
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Where can you find out about the electrical system in more detail? |
AP 101B - 0704/5 - 15A1C Aircrew Manual Book 1 Part 1 Chapter 5 - Electrical System |
