Navigation Flashcards
What are the main groups of navigation systems?
- ADIRS (Air Data and Inertial Reference System) and STBY instrumentsa) ADIRU1 [ADR and IR]
b) ADIRU2 [ADR and IR]
c) ADIRU3 [ADR and IR]
b) Standby Instruments
[note: ADR section supplies info about IAS, altitude, AOA and temp
IR section provides info about attitude, track, heading, FPV and Ground Speed]
- DEPENDENT systems (think ground systems)a) VOR1 and VOR2
b) DME1 and DME2
c) ADF
d) ATC and ATC (Transponders) - LANDING AIDSa) ILS1 and ILS2
b) Marker - INDEPENDENT (as don’t need ref to ground installations)a) RA1 and RA2
b) Weather Radar
c) GPWS
d) TCAS
How are the ADIRUs controlled?
- FMGS
- Overhead panel (ADIRS Control Display Unit)
Where and when are the Rad Alts indicated to pilots?
- PFD
- Synthetic voice when aircraft below 2,500 ft RA
Where do the ADIRS send info to?
- PFD
- ND
- ENGINE CONTROL
- Flight Control Computers
- ATC transponder
- GPWS
- centralised fault system
- Cabin Pressure Control
The ADR section receives pneumatic air data from 4 types of sensors. What are they?
A) 3 x Pitot Probes (Capt / FO / STB)
B) 6 x Static Pressure Ports (2 x Capt / 2 x FO / 2 x STB port)
C) 3 x AOA sensors (Capt / FO / STB)
D) 2 x TAT probes (Capt / FO)
What do the Air Data Modules (ADM) do?
They convert the raw data from the probes to electronic data for use in computers
How does GPS system work?
- Utilises 24 worldwide satellites
- Aircraft receives data from satellites via its 2 x Multi Modal Receiver (MMR))
- MMR process data and send to ADIRU
- ADIRU create the hybrid GP-IRS data for use by the FMGS
[Summary- satellites - MMR - ADIRU - FMGS]
Multi Mode Receiver System (normal and abnormal)
NORMAL
1) MM1 Supplies ADIRU1 and ADIRU3
2. MM2 supplies ADIRU2
MM or ADIRU FAIL
- They use the other available source
2 x ADIRU FAIL
- Remaining ADIRU is supplied by GPS
ADIRU2 Fail
- Pilot must select ATT HDG to F/O 3
Switch panel system- what is it used for re ADIRUs?
- ADIRU1 - DMC1 - PFD1 and ND1
- ADIRU2 - DMC2 - PFD2 and ND2
- ADIRU3 - standby
To utilise ADIRU3 (e.g due to failure of an ADIRU1 or 2) - use Switching Panel
Switching effectively lets you provide data from ADIRU3 to the failed side (Capt or FO)
Number sequence of ADIRUs on the overhead panel?
Left = 1
Middle = 3
Right = 2
IR Fault light. What do the following lights mean?
Steady Amber
Flashing Amber
- Steady Amber fault light = IR lost
- Flashing Amber = attitude and heading can be recovered
What are the standby instruments?
- Compass
- ISIS (Integrated Standby Instrument System) [mini pfd. Airspeed, attitude, altimeter, landing system info (visual when LS pb pressed and signals received)]
- DDRMI (Digital Distance and Radio Magnetic Indicator)
How many radio altimeters does the aircraft have?
- 2 X RAs (RaA1 shown on PFD1 And RA2 on PFD2)
[If one fails - the active RA is shown on both PFDs]
Back up Speed Scale key points
- Effectively an AOA system for controlling speed
- Engaged by pressing “BKUP SPD/ALT” pb located next to the PFD
- Caution - system unaware if speed brake being used
- Back up Alt info is based on GPS
The BUSS is used when dictated by the “Unreliable Speed Information” procedure in the QRH
Where does the ISIS and IDIRU3 obtain its source information?
Standby pitot and standby static port
