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Current Return Network (CRN) provides: Return path for AC normal current only. Path between main AC busses. Return path for normal and fault AC and DC current.

How can the airplane be in the virtual GROUND HANDLING mode?. If forward external power is connected but not selected on, and no other electrical power is supplied. If forward external power is connected and select ON, and other electrical power is supplied. If aft external power is connected and selected on, and no other electrical power is supplied.

Who controls the load management function?. The remote power distribution units (RPDU´s). The bus power control units (BPCU´s). The auxiliary power unit controller (APUC).

Which component is used to control the Lh AFT External Power Contactor to open or close?. The L2 GCU. The Right BPCU. The Left BPCU.

What is the purpose of the FOX modules?. Changes Arinc 664 from 10 Mbps to 100 Mbps. Changes light signals to electrical signals and visa versa. Changes Arinc 429 signals to Arinc 664 signals.

In Which common core system (CCS) components are the hosted software applications for airplane system stored?. General processor modules (GPM). Power conditioning modules (PCM). Graphics generator (GG) modules.

In primary display system, HUD projector is cooled by: Internal fan. Cold air from left CAC. It does not have a cooling system.

What component control related generator output voltage?. The CCS. The GCU. The BPCU.

What are the components of the CDN?. The GPM´s, the PCMs, the ARSs and associated copper wire interfaces. The ACSs, the FOX, the RDCs and associated fiber optic interfaces. The ACSs, the FOXs, the ARSs and associated fiber optic cables and copper wire interfaces.

On the GND with ENGs OFF, when you push the SYS sw on a DSP the default page is: FUEL. STATUS. FLT CTLs.

Where is the electronic flight bag (EFB) software and data stored?. In a hard drive inside the EFB display unit. In GPM 7. In a hard drive inside the EFB electronic unit (EU).

What is the function of the recorder independent power supply (RIPS)?. Is to give power to the forward flight recorder for 2 hours when aircraft power is not available. Is to give power to the forward flight recorder for 10 minutes when aircraft power is not available. Is to give power to the forward flight recorder for 30 minutes when aircraft power is not available.

How many copies of DCAF software are there on the B787?. There are 2 copies of the DCAF software. There are only 1 copy of the DCAF software. There are 4 copies of the DCAF software.

The common core system (CCS) provides: Improved reliability, decreased cost and weight. Decreased cost only. Better airplane aerodynamic performance.

How is APU Battery charged?. By a Battery Charger supplied from the F/O INSTR BUS. By a Battery Charger supplied from the CAP INSTR BUS. By a Battery Charger supplied from the HOT INSTR BUS.

The E-BPSU changes: 28 Vdc to +/- 270 Vdc. 28 Vdc to +/- 130 Vdc. 235 Vac to 28 Vdc.

What is the core network function that allows you to find and delete loadable software airplane part (LSAP) from the crew information system-maintenance system (CIS/MS) file server module (FSM)?. The Central Maintenance Computing Function (CMCF). The Onboard Storage Management Function (OSMF). The On board Data Loading Function (ODLF).

What is the function of the "ENG" switch on the EFIS/DSP?. To show or remove primary engine data from EICAS. To show or remove secondary engine data from EICAS. To show or remove engine fault data from EICAS.

To perform maintenance tasks and tests in the airplane, the system that is used is: ODLF through EFB. CMCF (Central Maintenance Computing Function). ACMF through MFD.

If one power conditioning module (PCM) fails: 50% of CCR components are unpowered. Only the GPMs and GG’s remain whith power. The other PCM continues to supply to all CCR cabinet module.

The Start Power Unit (SPU): Changes 235 Vac to 270 Vdc. Changes 115 Vac to 28 Vdc. Changes 28 Vdc to 115 Vac.

How many displays does the primary display system (PDS) have?. Four head down displays (HDD) and four head up displays (HUD). Four head down displays (HDD) and three head up displays (HUD). five head down displays (HDD) and two head up displays (HUD).

What is the function of CBIC?. Monitor and control electronic circuit breakers. Monitor and control electrical power system. Is used to control and monitoring contactors (ELCCs, BTB, etc).

The power conditioning module (PCM) changes 28 Vdc to: +12,5 Vdc to cooling components and +28 Vdc to modules in CCR. +12,5 Vdc used by all modules in CCR and +28 Vdc to cooling fan and control valve motor. +12,5 Vdc to GPM and +28 Vdc to other components in CCR.

What component change 235 vac or 115 vac to +/- 270 vdc?. CMSCs. ATUs. ATRUs.

How many displays show data if one graphics generator fails?. Six displays show data (five HDD and one HUD). All remaining displays show data. Four displays show data (four HDD) only).

What is the onboard data load function (ODLF) purpose?. It loads loadable software airplane parts (LSAPs) from the file server modules (FSM) to airplane systems. It updates the loadable software airplane parts (LSAPs) into the file server module (FSM) automatically. It loads loadable software airplane parts (LSAPs) from the remote data concentrator (RDC) to airplane systems.

What is the purpose of the 2 nose landing gear pressure transducers information?. The FMF uses the data to verify the calculated stabilizer green band position. The TMF uses the data to verify the calculated stabilizer green band position. The DCAF uses the data to verify the calculated stabilizer green band position.

The Graphic Generator (GG) has: Six output buses, but one is active at a time only. Two output buses and both buses are always active. Six output buses, but only two buses can be active at time.

How does the CCS send and receive airplane data?. By remote data concentrators (RDC) only. Through a common data network (CDN). Through wireless connection in forward and aft E&E compartment.

At initial power-up, where is the EICAS displayed. On the outboard side of the captain´s inboard HDD. Onthe inboard side of the firts officer´s inboard HDD. On the inboard side of the captain´s inboard HDD.

How can you connect the maintenance laptop (ML) to the airplane?. Wire Ethernet connection only. Wire Ethernet connection or wireless network. Wireless network only.

The CCS has: One CCR, six ARSs and twenty one RDCs. Two CCRs, six ARSs and twenty one RDCs. Two CCRs, four ARSs and ten RDCs.

What is the Remote Data Concentrator main purpose?. The RDC main purpose is to change airplane systems data from analog, discrete, arinc 429, CAN bus data to Arinc 664 format. The RDC main purpose is to calculate data and gives orders to many systems. The RDC main purpose is to convert fiber optic signal into electrical Arinc 664 signal.

How many graphics generator (GG) does the primary display system (PDS) have?. Two graphics generator. Four graphic generator. Eight graphic generator.

Electronic flight bag is used to: Replace some paper materials (MEL, QRH, etc). Control the head upper display (HUD). Show primary flight display data.

How is the Variable Frecuency Starter Generator (VFSG) cooled down?. By an Air/Oil Heat Exchanger (AOHE). By an Air Heat Exchanger (AHE). By an Oil Heat Exchanger (OHE).

The GATU transform: 235 Vac to 28Vdc. 115 Vac to 28 Vdc. 235 Vac to 115 Vac.

Each common computing resourse (CCR) contains: Two ACSs, two FOXs, eight GPMs, Two PCMs. Four ACSs, two FOXs, ten GPMs, one PCM. Two ACSs, four FOXs, eight GPMs, one PCM.