Terms in this set (60)
What is an ADIRU?
It is a combination of an Air Data Reference (ADR) unit and an Inertial Reference Unit (IRU)
What is the purpose of the IRUs?
To provide the aircraft with attitude, heading, track, speed and present position.
What is the basic operation of the IRUs?
Each IRU utilizes a set of ring laser gyros to sense rotation about the aircraft's three axes and accelerometers to sense g-force and changes in velocity. The IRUs are aligned prior to each flight.
What other position data do the IRUs utilize to calculate the aircraft's present position?
They utilize radio navigation data and GPS data to calculate a hybrid GPIRS position.
What is the basic operation of the ADRs?
Receiving data from the pitot static system the ADRs provide the aircraft with airspeed, mach, barometric altitude and backup vertical speed information.
What is the normal source of vertical velocity (VSI) info on the PFD?
The IRU. It can be backed up by the ADR in which case the "needle" will be amber.
What is the source of heading info on the DDRMI?
The same as PFD 1 (normally IR 1)
In normal operations to which PFD and ND do each ADR provide data?
ADR 1 - Captain's PFD and ND
ADR 2 - First Officer's PFD and ND
ADR 3 - backup
In normal operations to which PFD and ND do each IRU provide data?
IRU 1 - Captain's PFD and ND
IRU 2 - First Officer's PFD and ND
IRU 3 - backup
How is the switching to a backup ADR or IRU accomplished?
By use of the switching panel.
Use the AIR DATA selector to switch to the backup ADR.
Use the ATT HDG selector to switch to the backup IRU.
How is IRU alignment initiated?
By selecting the ADIRU selectors to NAV and entering a position in the MCDU
When is a full alignment of the IRU required?
First flight of the day
GPS is not available
If flight had limited updating of FMGC position with radio navaids.
How can the flight crew determine the IRU alignment process has started? Finished? How long does it take for the normal alignment?
When NAV is selected, the 10 minute alignment process is started, the "ALIGN" light illuminates and an ECAM "IRS IN ALIGN" memo is displayed.
When complete, the "ALIGN" light extinguishes and the ECAM memo is cleared.
During alignment, how does the crew normally enter the present position information to all three IRUs?
On the INIT A page of the MCDU
During an IRU alignment, what happens if more than 9 minutes have elapsed since the IRU alignment was initiated and no present position information has been entered?
The white "ALIGN" light will flash, reminding the pilot to enter the present position.
How is an IRU fast realignment initiated?
By turning all three IRUs OFF and back to NAV within 5 seconds. This starts a fast 3 minute realignment. This is only possible if electrical power to the IRU has not been interrupted.
How are the ADIRUs powered?
The ADIRUs primarily use AC power, with DC battery power as a backup
What indications do the crew have that one or more ADIRUs have lost AC power and are operating on DC battery power?
The "ON BAT" light illuminates. And on the ground, the external warning horn sounds.
During normal ADIRU operations, when would the "ON BAT" light be illuminated?
The "ON BAT" light illuminates for 5 seconds after going from OFF to NAV. This verifies the IRU can operate on aircraft battery power.
What is the power source of ADIRU 1?
AC ESS Bus
If if the emergency electrical configuration, what happens to ADIRU 2 and 3? What if ADIRU 1 fails?
They operate on DC battery power for 5 minutes then shut down.
If ADIRU 1 fails, emergency electrical AC power can be switched to ADIRU 3 by rotating the ECAM switching panel ATT HDG switch to CAPT 3.
When does the IRU fault light illuminate steady?
When a total failure of the IRU has occurred
When does the IRU fault light flash?
When a partial failure of the IRU has occurred. Present position from the IRU is lost for the remainder of the flight.
Attitude and heading information may be restored.
When does the IRU ALIGN illuminate?
Steady - the IR is in the alignment phase
Flashing - this could mean the aircraft was moved or bumped during alignment or if the IRU position differs by 1 degree from its last position, or the pilot didn't enter the position within 9 minutes of ADIRS initialization.
In the event of a partial failure of the IRU, what is the procedure to restore attitude information?
The selector must be pulled out and moved from NAV to ATT. The aircraft attitude should remain straight and level with constant airspeed during the in flight alignment (approx 30 seconds).
What does an amber ADR FAULT light indicate?
A failure of the ADR
How do you turn off the ADR without turning off the IRU?
By selecting the ADR pb to OFF.
What would be lost on the Captain's PFD if IRU 1 failed?
Attitude and heading information
What action would recover the attitude and heading information on the Captain's PFD in the event of an IRU 1 failure?
Selecting CAPT 3 on Switching panel ATT/HDG selector
What would be lost on the Captain's PFD if ADR 1 failed?
Airspeed and altitude information
What action would recover the airspeed and altitude information on the Captain's PFD in the event of an ADR 1 failure?
Selecting CAPT 3 on Switching panel AIR DATA selector
Which MCDU page allows the pilot to deselect Nav Aids such as the GPS?
What happens if one GPS fails?
The ADIRUs automatically get GPS data from the remaining GPS.
How many VOR receivers are installed?
What is the normal method the pilot will use to select a VOR station?
Entry to the RAD NAV page of the MCDU.
How many DME receivers are installed?
How many channels are in each DME receiver?
3 - FMS radio position updating
1 - VOR-DME display
1 - ILS-DME display
How many ILS receivers are installed?
Note: both ILS receivers are always tuned to the same frequency
How is the ILS information displayed on the PFD?
By pressing the LS pb on the EFIS panel
When is a flashing amber "ILS" displayed in the bottom right hand corner of the PFD?
1. ILS approach entered in the MCDU
2. FCU panel APPR pb is armed
3. EFIS panel LS pb is not selected
If the ND Nav Selector is positioned to the ILS position, which ILS receiver will be displayed?
The off-side ILS receiver
In the event of a dual FMGC failure, how are the navigation receivers manually tuned?
By using the STBY NAV tuning on the Radio Management Panel (RMP)
By looking at the ND, how can the pilot determine if a navigation receiver has been automatically tuned, manually tuned on the MCDU or manually tuned via the RMP?
- No symbol indicates auto tuning
- M indicates manual tuning
- R indicates STBY NAV tuning using the RMPs
If an RMP is used to tune the ILS, which ILS receivers are tuned to the selected frequency?
Both ILS receivers
If an RMP is used to tune the VOR, which VOR receiver is tuned to the selected frequency?
The associated VOR receiver
How many Radio Altimeters are installed?
When is the Radio Altimeter height information automatically displayed on the PFDs?
Below 2500 feet AGL
How many transponders are installed?
What are the primary functions of the radar system?
1. weather avoidance
2. turbulence detection
3. terrain mapping
4. predictive windshear detection
What would prevent the radar display on the ND?
1. ND mode selector in PLAN, or
2. TERR selected ON
What does a magenta radar radar image indicate?
At what range is the weather radar TURB mode available?
At ranges of 40 nm or less
When is predictive windshear (PWS) active?
1. PWS switch in AUTO
2. Aircraft below 2300 ft AGL
3. ATC switch is ON or AUTO
4. Either engine running
Below what altitude are PWS warnings and cautions displayed and announced?
Below 1500 feet AGL
The PWS system scans the airspace within a range of how many miles ahead of the aircraft?
PWS Cautions are provided in what range?
Below 1200 feet AGL, from 1.5 to 3.0 nm ahead of the aircraft and within +/- 25 degrees either side.
PWS Warnings are provided in what range?
Below 1200 feet AGL, from 0.0 to 1.5 nm ahead of the aircraft and within approximately +/- 0.25 nm either side.
On final approach, the PWS Warnings are downgraded to Cautions below what altitude?
Below 370 feet AGL
PWS alerts are inhibited on takeoff (above 100 kts) and landing below what altitude?
50 feet AGL
On the takeoff roll, below 100 kts, PWS Warnings and Cautions are available out to what range?