Term
| Which type of APU is on the CL605? |
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Definition
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Term
| What is the size of the APU generator (electrical output)? |
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Definition
| 30kva, 400hz, 3 cycle AC generator |
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Term
| Where does the APU get fuel? |
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Definition
Normal - Right tank
Backup - Left engine fuel feed manifold (neg-g) |
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Term
| How is the APU generator adapter oil cooled? |
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Definition
| Fuel/Oil heat exchanger uses fuel from right main tank |
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Term
| What type of signal does the APU receive for automatic and manual shutdowns? |
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Definition
| Overspeed signal (107%) closes fuel control unit's solenoid shutoff valve |
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Term
| When is Neg G fuel utilized? |
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Definition
Neg G condition exists
APU pump fails |
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Term
| What closes the APU Neg G shutoff valve? |
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Definition
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Term
| What is the time limit when the APU fuel pump is inop? Why? |
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Definition
10 min
Neg G fuel does not cool APU generator adapter oil |
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Term
| What powers the APU fuel pump? |
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Definition
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Term
| What is the amp hour rating of the APU battery? Main battery? |
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Definition
APU - 43 amp hour
Main - 17 amp hour |
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Term
| What is the min voltage required for APU start? |
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Definition
| 22 volts for each battery |
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Term
| Where does the ECU receive its power (primary/secondary)? |
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Definition
Primary - Battery Bus
Secondary - APU Battery Direct Bus |
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Term
| When does the ECU use secondary power? |
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Definition
| When primary voltage drops below 22v |
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Term
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Definition
Monitors APU sensors and switches
Sets fuel and temp schedules
Adjusts fuel supply to maintain constant RPM at 100%
Sends data to EICAS and APU Fault panel |
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Term
| How is the APU starter motor powered? |
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Definition
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Term
| When is APU ignition started/stopped? |
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Definition
Start - Start/Stop pressed and 5% RPM
Stop - 99% RPM |
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Term
| What happens when the Power Fuel switch is selected? |
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Definition
Powers APU ECU after 3 sec bite test
Opens APU and Neg G shutoff valves
Energizes APU fuel pump
EGT and RPM gauges on EICAS page |
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Term
| What happens when the APU Start/Stop switch is selected? |
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Definition
5% - Fuel and ignition
35%-45% - Starter cutout
95% 4 sec - APU Avail
99% - Ignition deactivated
100% 15 sec - APU Gen Off msg
2 min - Bleed loads |
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Term
| Why do you wait until all EICAS indications are removed before turning the battery master off? |
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Definition
| Allows ECU time to complete shutdown functions and power down |
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Term
| What are the auto-shutdowns of the APU? |
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Definition
Fire, Overspeed/Underspeed, Overtemp
Low oil pressure, Gen adapter low oil pressure
High oil temp, Gen adapter high oil temp, Loss of EGT sensor, ECU failure |
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Term
| When does the APU SCV (surge control valve) operate? Why? |
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Definition
| High altitudes to prevent compressor surges 15,000'-20,000' |
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Term
| Where is bleed air indication displayed? |
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Definition
EICAS summary page is the only place
(also fuel temp and bulk fuel temp) |
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Term
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Definition
Valve has failed in open position
APU LCV interlock activated |
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Term
| "APU SOV" and "APU NEG-G SOV" caution |
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Definition
| Valve open with APU FIRE PUSH or does not match APU PWR FUEL position within 5 seconds |
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Term
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Definition
| Fuel and Neg G shutoff valves have closed after APU FIRE PUSH sw/lt is pushed |
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Term
| When will the APU green "AVAIL" light come on? |
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Definition
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Term
| How do you confirm the cause of an APU shutdown? |
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Definition
| APU trip indications on the APU fault panel |
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Term
| How is the APU protected by fire? |
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Definition
Auto-shutdown
Detection system
Firex bottle |
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