ATA 34 Navigation Flashcards by Stuart Curran

What does the ADR part of the ADIRU supply to the FWC?

Overspeed

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Where are the ADIRUs located?

Opposite (forward of) the 80VU rack

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What do the discrete inputs to the ADM determine?

ADM location and the type of pressure data (pitot or static) provided to the ADR

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What does the ADM output on the ARINC databus?

Digital pressure information
Type of pressure
ADM identification
BITE status

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Which ADIRUs do the TATs connect to?

TAT1 - ADIRUs 1 and 3

TAT2 - ADIRU 2

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How many static ports are there, and how many ADMs do they connect to?

6 static ports connect to 5 ADMs

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What are the AOA sensors also known as?

Alpha probes

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To which aircraft are the AOA sensors connected to the IR part of the ADIRU?

Later aircraft/Neos with Back Up Speed Scale (BUSS)

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Which probes require a water drain?

Standby static ports

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Where an ADIRU, or part of fails, how do the computer systems decide which ADIRU signal to use?

According to the switching, as selected by the flight crew, for consistency of computation and display

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What happens as soon as the ISIS is energised?

It shows the initialisation display for 90 seconds

Four yellow boxes indicating ATT, SPD, ALT and INIT 90s

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How do you make the ISIS show maintenance data?

Hold the two upper buttons (BUGS and LS) for at least 2 seconds

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What will be displayed on the ISIS when there is a complete (total) failure of the unit?

Red message OUT OF ORDER associated with the related fault code is shown

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At what airspeed is the BITE function of the ISIS inhibited?

60 kts calibrated airspeed

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What is important from a maintenance perspective about the red box around the static ports?

Relates to the reduced vertical separation minima no damage area allowed around the probes

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Which pressure connection to the back of the ISIS instrument is signified by a red connector?

Pitot - total pressure

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What supplies the power to the ISIS if the DC ESS BUS is unavailable?

A back-up of 28V DC is automatically supplied from the HOT BAT BUS if the airspeed is greater than 50 kts

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Which databus does ISIS use?

ARINC429

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What are the outputs of the ISIS unit?

Inertial data transmission on high-speed ARINC429
Anemometric data transmission on low-speed ARINC429
Discrete output for fault/healthy indication

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How do you activate BUSS on aircraft pre SB 34-1658?

Turning all 3 ADR switches to OFF

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When is the MACH number indicated on ISIS?

When Mach is above 0.5

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How would you be able to tell that BUSS is being utilised when looking at the PFD altitude information?

GPS ALT appears under altitude scale
GPS is indicated near to altitude bar

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What is the CAS replaced with on the PFD when in BUSS?

Median value of the three AOA values coming from the ADRs via the Internal Reference (IR) bus

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How does the AOA value indicate speed of aircraft with regards to BUSS?

Too shallow an angle indicates too fast

Too steep an angle indicates too slow

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What is the MMR?

A navigational computer with 3 internal receivers ILS+G/S and GPS

What indication will show above the attitude ball where BUSS is utilised?

USE MAN PITCH TRIM

What are the three segments of GPS?

* Spatial segment * Control segment * User segment

Where are the MMRs located?

90VU

Where are the MMR antennas?

Forward top part of the aircraft fuselage

What is not used for navigation when GPS mode is active?

VOR/DME/ADF

Describe the GPS antenna?

L-band active antenna, with an integrated preamplifier and filter, providing an omni-directional upper hemispheric coverage

Why does the GPS antenna receive L2 frequencies as well as L1?

To estimate the propagation error of L1 and to suppress it

Which MMR supplies information to ISIS?

MMR1

What colour is ILS information displayed by the EFIS?

Magenta

What is the purpose of the predictive GPS function?

Predicts the availability of the GPS within 15 minutes of ETA at destination or at any waypoint entered by the crew

What type of **position** data do the ADIRUs send to the FMGCs?

* Pure IR data position * Pure GPS data position * Hybrid GPIR data position

How can the ILS circuits be tuned?

* Manually via the MCDUs * Back-up navigation function via the RMPs * Automatically via the FMGCs

What is port A used for on the MMR?

Onside automatic tuning by the FMGC

Which RMP is supplied with power in emergency electrical configuration?

RMP1

What is necessary to preserve the side 1/side 2 segregation should ADIRU2 fail?

Select the second input port of ADIRU3 by means of the ATT HDG selector knob on the SWITCHING panel MMR2 will provide data to FMGC2 through ADIRU3

Why is MMR1 data sent to EGPWS?

For Mode 5 computation (descent below G/S)

What is the purpose of the discrete signal sent by the FMGC to the MMR unit?

Inhibits frequency change in the MMR unit when LAND mode is armed below 700 ft

Which computers are involved in reactive windshear?

ELAC or FAC

What are the conditions where windshear warnings will be given?

* Aircraft below 1200 feet * Windshear is < 1.5 nm in front of the aircraft * Windshear is in the arc ± 25° of the nose of the aircraft

What aural messages will the flight crew receive when windshear is detected?

'GO AROUND, WINDSHEAR AHEAD' in approach 'WINDSHEAR AHEAD, WINDSHEAR AHEAD' in take-off

What warning is given of windshear if the event occurs at a longer range, but still < 3 nm?

MONITOR RADAR DISPLAY

Where are the WXR computers?

Forward avionics compartment, forward of 90VU

What frequency does the weather radar transceiver operate in?

X-band

What are the different windshear components used for determination of the windshear threshold?

* Horizontal and vertical wind velocity * Aircraft true airspeed

What is the area covered by the WXR antenna scan?

180° sector in azimuth, and ± 15° in tilt

What is the stabilisation data of the WXR?

* Pitch and roll angles * Selected tilt * Antenna azimuth * Elevation angle

What information does the WXR receive from ADIRUs 1 & 3 for stabilisation and control of the antenna?

Pitch and roll data

Why does WXR need ground speed information from ADIRUs 1 & 3?

Doppler mode correction

What information is passed to the WXR for PWS function from ADIRUs 1 & 3 for velocity calculations?

* Altitude * True airspeed * East/West and North/South velocity ground speeds * Track angle * True heading * Magnetic heading

What is the purpose of the landing gear extended signal sent by the LGCIU to the WXR TXR?

Determine if the aircraft is taking off or landing to generate the correct aural message

When is PWS function automatically activated?

* Below 2300 ft * ATC/TCAS is in AUTO or ON * Engines are running

What inhibits predictive windshear aural alerts?

Reactive windshear and stall warning from the FWCs

What is connected at one end of each ARINC453 databus and why?

Low inductance resistor Avoid a signal return

What is the main difference between RDR-4000 and previous generations of weather radar?

Continuously scans the atmosphere in front of the aircraft from 0 ft to 60000 ft

What is the ON PATH envelope?

± 4000 ft of the reference flight path

What are the minimum and maximums of the OFF PATH mode of RDR-4000?

Lower boundary at higher altitudes - When the aircraft is above 29000 ft, lower boundary is 25000 ft Higher boundary at lower altitudes - When the aircraft is below 6000 ft, upper boundary is 10000 ft

What do the two redundant ARINC429 low-speed buses from **Air Data Reference** provide for the RDR-4000?

* Airspeed data used for volumetric buffer processing and PWS function * Altitude data used in elevation mode * Static air temperature for hail and lightning inferring

What do the two redundant ARINC429 high-speed buses from **inertial reference** provide for the RDR-4000?

* Pitch, roll and drift angle data for the stabilisation and control of the antenna * Hybrid position and altitude, speed, track/heading angle for volumetric buffer processing

What are the danger zones with regards to WXR transmission?

Metallic obstacles - 5m ± 90° arc Personnel - 1.5m ± 135° arc Refuelling - 100m

What is the pitch and roll limitation of the RA?

± 30°

When will a red ribbon appear on the PFD next to the altitude scale?

Below 500' AGL

Which RA transceiver is connected to which PFD during normal operation?

RA1 to captain's PFD RA2 to F/O's PFD

Why do the EIUs send a discrete signal to the RAs?

Inhibit the test on the ground when the associated engine N2 rating is above minimum idle rating

Where are ATC and TCAS computers located?

80VU

Which components are connected to the ATC transponder by a suppression line?

* DME * TCAS

What information do ADIRUs provide for the ATC system?

Barometric altitude for mode C

What information do FMGCs provide for the ATC system?

Flight number for mode S

What is TTISS and what does it replace as an option?

Traffic/Terrain Integrated Surveillance System TCAS and #2 ATC

What are the conditions required for the transmission of ADS-B?

* EHS wiring provision * Transponders capable of ELS/EHS/ADS-B * MMR or Global Positioning System Sensor Unit (GPSSU, from Honeywell)

What is the nominal surveillance height of TCAS and what can this be extended to?

Nominal - ±2700 ft Above or below - ± 9900 ft

What is the nominal surveillance range of TCAS and what can this be extended to and why?

Nominal - 40 nm behind and either side, 60 nm in front Extended - 60 nm behind and either side, 100 nm in front Reason - Above FL180 and in low-density areas

What is TAU?

The ratio between the distance that separates aircraft and the sum of their speeds

Why are the TCAS antennas directional?

Provides relative bearing of the transmitting aircraft

What is the purpose of the received signal from the RA to the TCAS transponders?

Determine the computation sensitivity level and trigger the inhibit orders

What information does the **IR** part of the ADIRUs provide to the TCAS transponders?

* Magnetic heading * Pitch and roll attitude

What are the priorities of advisories and alerts, for which the TCAS transponders receive inhibit signals on discrete lines?

1. Stall 2. Windshear 3. Predictive windshear 4. EGPWS

What is the purpose of EGPWS?

Prevent accidents caused by Controlled Flight into Terrain (CFIT)

What is the unique warning available with T2CAS?

AVOID TERRAIN - Immediately notifies crew that the normal recovery won't work

What are the two ways that EGPWC will receive GPS data?

1. ADIRS connection as GPS data transmitted via the IR1 bus 2. Direct connection with MMR1 if ADIRU1 is not able to transmit GPS data

During what modes will the red PULL UP legends light with regards to the EGPWS?

* Second boundary of mode 1 is penetrated * Mode 2 activated * Any Terrain Awareness Display (TAD) or Terrain Clearance Floor (TCF) alert is activated

What are the first five modes of EGPWS?

Mode 1 - Excessive rate of descent Mode 2 - Excessive closure rate with terrain Mode 3 - Descent after take-off & minimum terrain clearance Mode 4 - Unsafe terrain clearance Mode 5 - Descent below glideslope

What alert is given if the first boundary of Mode 1 of EGPWS is penetrated?

Aural 'SINK RATE' Both GPWS lights come on

What is mode 2A of EGPWS?

Flaps not in landing configuration and aircraft not on the G/S beam

What is mode 2B of EGPWS?

Flaps in landing configuration

When will the alerts stop for mode 2A?

When the barometric or inertial altitude are increased by 300 feet

What EGPWS mode does TCF complement?

Mode 4

What is the time delay that a ground station will wait (dead time) before replying to a DME interrogation?

50 microseconds

When will DME information show on the PFD and ND?

PFD - if LS P/B is selected ND - if ADF/VOR is set to VOR

Where are the DME computers?

80VU

Where are the DME antennas?

Lower forward fuselage

What happens if one FMGC fails with regards to tuning the DMEs, ADFs and VORs?

DME receives a discrete signal through the RMP of the onside FMGC failure to automatically select Port B for direct offside tuning

In what situation might back up tuning of the NAV radios be required through the RMPs?

* Failure of both FMGCs * Both MCDUs fail

To what components does the LGCIU send flight/ground information so that the internal BITE module can count flight legs?

* MMR * WXR * RA * TCAS * EGPWS (also for Mode 4: Unsafe terrain clearance) * DME * ADF * VOR

Where are the VOR computers located?

80VU

What will be indicated on the ND where navigational tuning has occurred?

M - manually tuned by the pilot through the MCDU R - tuned from an RMP Blank - tuned automatically by FMGS

What three functions are combined in T/TISS?

* TCAS * TAWS * ATC

How is the software of the T/TISS updated?

TCAS part - ARINC615A data loader TAWS part - Compact flash data loader/recorder

ATA 34 Navigation Flashcards

(102 cards)