Examen n2

Where are the HF transceivers located?. AFT cargo compartment. Forward Cargo Compartment. AFT EE bay.

Which LRUs have the SELCAL decoder software?. The SELCAL decoder LRU. Audio Gateway Units (AGU). Display and Crew Alerting Function (DCAF) partition on General Purpose Modules (GPMs).

If the captain ACP fails, how can the observer ACP be used?. Using the observer audio override selector switch in the PS. Swapping the ACPs. Turning OFF and back ON the captain ACP.

The start power unit (SPU): Changes 235V AC to 28V DC. Changes 235V AC or 115V AC to +/-270V DC for the common motor start controllers (CMSC). Changes 28V DC from the APU battery to 115V AC for APU battery start.

What happens if gas pressure in the battery enclosure goes above 3 psi?. The red indicator on the pressure burst indicator extends. The red indicator on the pressure burst indicator retracts. A pressure burst disk ruptures and the gas vents overboard through a metal tube.

How long could the emergency lights operate?. Up to 30 minutes. Up to 20 minutes. Up to 15 minutes.

The battery State of Charge (SOC) indicator on the PS panel lets you see the condition of: Only the main battery. Only the APU battery. Main and APU batteries.

Which component monitors the VFSG oil temperature in the surface air oil heat exchangers (SAOHE)?. R BPCU for R1 and R2 VFSGs. L BPCU for L1 and L2 VFSGs. Left and right EECs.

Which component makes alert and chime tones?. Cabin Services System Controller (CSSC). Speaker Drive Module (SDM). Cabin Zone Unit (CZU).

The main function of Remote Power Distribution System (RPDS) is: Supplies 28V DC and 115V AC to loads of 1 amp and more. Supplies 28V DC and 115V AC to loads of 50 amps or less. Supplies 28V DC and 115V AC to loads of 10 amps or less.

Where do you reset the red LED in the EMER LIGHTS TEST switch on the master ASP after the test?. ATA 33 CMCF GROUND TEST. ATA 33 CMCF SPECIAL FUNCTION. Cabin Maintenance menu on Cabin Attendant Panel (CAP).

The frequency of HF and VHF communication systems is selected through: Head-Up Displays (HUD). Their own panels. Tuning Control Panel (TCP).

How are the handsets directory codes determined?. Software loaded from the Cabin Service System Controller (CSSC). Switch selections behind the cradle. Program pin.

You can get access to the CABIN MAINTENANCE screens on the CAP and: Maintenance Laptop. MCDF. EFB.

What component changes 235V AC or 115V AC to +/-270V DC?. Common Motor Start Controllers (CMSCs). Autotransformer Units (ATUs). Autotransformer Rectifier Units (ATRUs).

What are the CBIC control modes?. Ground and Air. Limited, Ground and Maintenance. Limited, Full and Maintenance.

The Transformer Rectifier Units (TRU): Change 235V AC to 28V DC. Convert 235V to 115V or 115V to 235V. Change 235V AC to +/-270V DC for CMSCs.

When the towing switch is selected ON: Power is supplied to the left VHF communications and flight deck dome lights. It energizes the four EBPSUs. Both are correct.

If the right BPCU loses its external power TRU, where does it get power?. Backup bus. Left external power transformer rectifier unit. R 28V DC bus.

All the communication and navigation systems are noisy. What could cause this?. Electrical power is not voltage regulated. Electrical power is not frequency regulated. Some static dischargers are broken or missing.

What is the function of the CBIC?. Monitor and control electronic circuit breakers. Control and monitor contactors (ELCCs, BTB, etc.). Monitor and control the entire electrical power system.

Emergency lights get power from batteries if: All VFSGs are lost in flight and APU works normally. Airplane power fails. One VFSG fails in flight.

What components change 235V AC to 115V AC?. Autotransformer Unit (ATU). Secondary Power Distribution Unit (SPDU). Autotransformer Rectifier Unit (ATRU).

If the Cabin Service System Controller (CSSC) fails: All handsets fail. Handsets continue to operate normally. Only the handset on the master attendance panel continues to operate normally.

The main function of Secondary Power Distribution Units (SPDUs) is: Supply 115V AC and 28V DC to loads of 50 amps or more. Supply 115V AC and 28V DC to loads of 10 amps or less. Supply 115V AC and 28V DC to loads of 50 amps or less.

The Cabin Zone Unit (CZU): Controls cabin area lighting. Changes digital signal to analog audio. Is a touch screen.

How is APU battery charged?. By a battery charger supplied from the F/O INSTR BUS. By a battery charger supplied from the CAPT INSTR BUS. By a battery charger supplied from the HOT BATTERY BUS.

What is the purpose of the Galley Auto Transformer Unit (GATU)?. Changes 235V AC to 115V AC for the forward galley. Changes 235V AC to 115V AC for the aft galley. Changes 115V AC to 235V AC for the aft galley.

With forward external powers supplying electrical power to the airplane: Both left and right BPCUs can be software loaded. Only the left BPCU can be software loaded. Only the right BPCU can be software loaded.

If you need to communicate from the flight deck with P40 or P57 service interphone jack panels: Select service interphone ON in PS and flight interphone (FLT) on ACP. Select service interphone ON in P57 and service interphone on ACP. Select service interphone ON in P40 and flight interphone on ACP.

The aft external power connection is used for these purposes: Supply the standby power system on ground. Feed the aircraft electrical buses. Start right engine with external power if APU is unavailable, operate a third hydraulic electric motor, and reduce packs load on ground for tests.

Where is the B787-9 HF antenna located? (Diagram letters A/B/C). A — middle leading edge of vertical stabilizer. B — base of vertical stabilizer beneath dorsal fairing. C — top of vertical stabilizer.

What electrical power does the VFSG provide to the aircraft?. 115V AC / 90 kVA / 400 Hz. 235V AC / 250 kVA / variable frequency. 235V AC / 225 kVA / variable frequency.

What conditions turn on the VFSG GEN DRIVE light?. Low oil pressure and high oil temperature. High oil temperature and VFSG bearing failure. Low oil pressure and VFSG bearing failure.

What is the center VHF antenna location? (Diagram letters A/B/C). B. C. A.

The power for the emergency lights comes from: Aircraft Battery. WELS Control Unit (WCU) batteries. RPDUs (115V AC).

The airplane is in GROUND HANDLING mode. How do you give power to the ground service bus?. Ground Service switch on the master attendant panel. Ground Service menu on the CAP. Ground Service Enable on PS.

HF: What is the HF antenna coupler function?. Matches (tunes) antenna impedance to transceiver impedance. Reduces transmission and reception noise. Modifies antenna length for better transmission and reception.

How does the Bus Power Control Unit (BPCU) get 28V DC power to sense the power quality and close the external power contactor?. APU hot battery bus. Backup bus. External power transformer rectifier unit.

How many Variable Frequency Starter Generators (VFSGs) are installed on the Boeing 787?. Two VFSGs. Four VFSGs. Six VFSGs.