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Speed Brakes
Sidestick Fault
Hot Brakes
Door Not Closed
-the following are only triggered when takeoff power is set
Parking Brake On
Flex Temp Not Set (not displayed if thrust levers set in TOGA detent)
Altitude Alert
Altitude alert (tone and pulsing yellow altitude windows) is inhibited when:
Slats are out and landing gear selected down
Landing gear locked down
Captured on glide slope
The tone is also inhibited when on autopilot and capturing a normal set target
altitude, but pulsing yellow window is still effective.
Windshear prediction and detection
Windshear prediction is radar based and is available below 1500’ AGL. It looks
out to 5 nm ahead of aircraft. A warning message reading WINDSHEAR AHEAD
will appear on PFD and ND. Color of the warning will be red or amber depending
on level of warning. Levels include Advisory (display only) and the Warning and
Caution messages have an aural warning alert as well. Predictive warnings are
inhibited during takeoff after 100 kts. until 50’ AGL and then again inhibited on
landing once below 50’ AGL. Windshear prediction uses the normal weather
radar and there is only one radar installed. If the normal radar is turned off the
windshear prediction will still operate normally if set to Auto. Prediction means
US Airways Airbus A319, A320, A321 Notes
43
that a possible windshear is ahead of you. Predictive windshear will not warn for
CAT (Clear Air Turbulence), system must have precipitation to work.
Note: Predictive windshear is inhibited during takeoff after 100 kts up to 50’!
Reactive Windshear detection is controlled by the FAC’s and is based on
GNADIRS information. Windshear detection means that you are IN a windshear.
Windshear detection (when slats/flaps selected) is available 5 seconds after
takeoff until 1300’ AGL and is again available on landing from 1300’ AGL until
50’ AGL.
A red WINDSHEAR warning is shown on the PFD and an aural WINDSHEAR
alert is given three times during windshear detection.
Note: Windshear detection is NOT available until 5 secs. after takeoff!
US Airways Airbus A319, A320, A321 Notes
44
GNADIRS
The Global Navigation Air Data Inertial Reference System (say that five times
fast!) provides the FMGS with the data input it needs to navigate the aircraft. The
FMGC decides which signals are most accurate and provide a “synthetic” (best
guess) aircraft position after weighing all available data. The FMGC can also
estimate the accuracy of its synthetic position due to available sensors and data.
This information will be used during RNAV approaches. The IRU’s have laser
ring gyros that provide a stable reference signal as well as provide attitude
information. Be very careful NOT to just turn off the IRU because it gives a bad
nav signal. It may still be giving good attitude information and can be selected to
attitude information only (ATT). The FMGC can track IR drift and predict aircraft
position even when GPS or ground based (VOR/DME) signals are lost.
GNADIRS also provides the aircraft with needed air data information such as
altitude, mach, temperatures, airspeed, etc. Failure of an associated air data
reference DOES NOT fail the IR! The failed ADR can be turned off by
deselecting its pb and still maintain all IR and GPS functions.
There are two independent GPS receivers called MMR’s (Multi Mode Receiver).
The MMR’s process position data and send it to the GNADIRU’s. MMR1 sends
data to ADIRU1 and MMR2 sends data to ADIRU2. Both MMR’s can send data
to ADIRU 3 as needed for backup purposes if ADIRU 1 or 2 fail.
The system is very accurate and reliable with a high degree of redundancy using
three ADIRU units and multiple navigation signal inputs from GPS and IR. The
FMGC also takes VOR/DME signals (PH 13.3.1, 17.3.1) into account along with
the GNADIRS data to compute aircraft position. The third GNADIR is basically a
standby that can be selected if #1 or #2 fail.
Amber FAULT light:
Steady, IR lost
Flashing, may be available in ATT only, NAV lost
White ALIGN light:
Steady, in align mode (normal)
Flashing
align fault
No entry in 10 mins.
1° difference in lat. & long. from shutdown position
Extinguished, alignment is complete (normal)
Note: DO NOT move aircraft during alignment. Wait 3 minutes after aircraft
stop to re-align or turn off
US Airways Airbus A319, A320, A321 Notes
45
EGPWS
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