Navigation Flashcards
How many ADIRU’s does the US Airways Airbus 319/320/321 have?
Three.
When the Mode Selectors are positioned to NAV during a full alignment, what indications should be
noted on the panel?
The ON BAT light illuminates momentarily followed by three align lights on each respective IR.
The ON BAT light illuminates momentarily followed by three align lights on each respective IR.
One or more IR’s is being supplied only by the aircraft battery. It illuminates momentarily at the
beginning of a full alignment.
If the ADIRS switches are already in NAV, how do you accomplish a rapid alignment?
Select the MODE Selectors OFF then back ON within five seconds and select ALIGN IRS on INIT
page.
What would occur if the pilot were to take longer than five seconds to cycle any of the MODE Selectors
from OFF back to NAV?
The affected IRS will initiate a full alignment.
Can the present position be entered through the ADIRU panel or must we use the MCDU?
Present position may be entered in the ADIRU through the numeric keyboard.
Does the center OFF, 1, 2, 3 switch turn the GNADIRS unit OFF?
No, only the upper display.
What would cause an ADIRS ALIGN light to flash?
IR alignment fault, or no present position entry after 10 minutes, or difference between position at
shut down and entered position exceeds 1° of latitude or longitude.
The entered position causes the ALIGN lights to flash. If the coordinates are correct, how is the problem
corrected?
Check the city pairs and re-enter if necessary.
What would a steady FAULT light in the #1 IR indicate?
The respective IR is lost.
Would a fault in the #1 IR cause the #1 ADR to fail?
No, they are independent systems.
What would a flashing IR FAULT light indicate?
Attitude and Heading may be recovered in ATT mode.
Are we allowed to pushback during the alignment process?
No. Movement will cause the system to fault.
After selecting the IR MODE selectors to NAV, when should you select ALIGN IRS on the INIT A page?
Immediately after selecting NAV to avoid excessive ADIRS drift
If you were to rotate the #1 IR mode rotary selector to OFF, would that affect the #1 ADR?
Yes, although they are independent systems, they share an ON/OFF switch
If IR #1 were to fault in flight, what information would be lost on the #1 PFD? How is it displayed?
Attitude and heading information is lost. Red ATT and HDG flags replace attitude and heading
information on the PFD
If IR #1 were to fault in flight, the DDRMI will show a compass card flag. Why?
The DDRMI will show a compass card flag because IR #1 drives the DDRMI compass card until it is
switched.
What IR information may be recovered if an IR fault light is flashing?
Attitude and heading may possibly be recovered by turning the rotary IR selector to ATT.
Are the IR track, wind, and heading information displayed on the IR overhead panel relative to true or
magnetic?
True
If the SYS pb is selected OFF, what is inhibited?
All basic EGPWS alerts (modes 1-5) are inhibited.
When is the purpose of the FLAP MODE pb?
To inhibit nuisance warnings when an ECAM calls for landing with a reduced flap setting.
What is the purpose of the LDG FLAP 3 pb?
It is used when making a landing in CONFIG 3.
If a TERR fault light illuminated, would that affect the basic EGPWS modes?
No.
Where is ILS #1 and #2 displayed?
ILS #1 is displayed on the CAPTAIN’S PFD and F/O ND
ILS #2 is displayed one the F/O PFD and the CAPTAIN’S ND.
Radio Height displayed on the PFD below what altitude?
Radio Height is displayed on the PFD below 2500’.
What information from the ADR is displayed on the PFD?
Airspeed and altitude.
When is side stick position and max sidestick deflection, displayed on PFD?
Sidestick position and max sidestick deflection are displayed on the ground on the PFD after the first
engine start.
If a RADIO ALTIMETER #1 fails, is radio altitude information lost on either PFD?
No. There are two radio altimeters. Should one fail, the remaining Radio Altimeter height is displayed
on both PFD’S.
What information do the FAC’s provide that is indicated on the PFD?
On the PFD, all characteristic speeds are FAC generated: VLS, Vmax, Vfe, ALPHA MAX, ALPHA
PROT, F, and S, speeds, speed trend, etc.
With the TERR ON ND pushbutton off, what happens if a terrain caution is generated?
Terrain data is automatically displayed on the ND and the ON light illuminates.
How can the pilot differentiate terrain, from radar sweeps?
TERR sweeps from center outward.
Does the EGPWS use radar signals to “ground map” terrain?
No, it utilizes a worldwide terrain database.
