(1)
The actual position of the rudder trim (rudder position) is sent to:
-
The rudder trim indicator
-
The ECAM system
-On the label 313.
This position is validated by:
-
The status matrix which turns to: . NCD if the RUD TRIM function is not available . F/W in the event of a computer failure.
-
The FAC HEALTHY hard-wired discrete. A flag appears if the signal is not available.
(2)
The actual position of the rudder travel limitation unit is sent to the ECAM system (F/CTL page). This position is validated by the status matrix which is NO only if RVDT sensor monitoring is healthy. In normal operation, the TLU indexes are displayed in green, else a flag appears.
**ON A/C ALL
E. Windshear Warning
(1)
General The windshear is a sudden change in wind direction and/or speed over a relatively short distance in the atmosphere. This can have an effect on aircraft performance during takeoff and landing phases. In windshear conditions, the principle is to reduce the detection threshold according to the detected windshear in order to get the possibility of performing a go around maneuver sooner. (Ref. Fig. 010)
(2)
Warning (Ref. Fig. 011) The FAC which fulfills detection function generates the signals necessary to output the windshear warning. This warning is activated on condition that:
-The windshear function is activated through pin programming
-A windshear condition is detected
1EFF : ALL 1 22-64-00Page 21 1 1 Aug 01/05 1 1 1CES 1
ECAM - RTL / Rudder Trim Position
Figure 009A
Windshear Detection Principle Figure 010
1EFF : 1 1R 1CES ALL 1 11 1 22-64-00 Page 23 May 01/04
INTENTIONALLY BLANK
1 1
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1 1 Feb 01/03R 1 1
1CES 1
Windshear Architecture R Figure 011
1EFF : ALL 1 22-64-00Page 25/26
1 1 May 01/04R 1 1
1CES
-The aircraft is in takeoff or landing phase (altitude and
flaps/slats configuration conditions)
-Specific monitoring functions do not detect any windshear function
defect.
Crew is aware of the windshear warning through:
-
The red WINDSHEAR message which comes into view on the PFDs above the horizon line (sky area)
-
The 'windshear' aural warning which is broadcast three times. When the parameters which elaborate this warning are no longer valid, the windshear warning is inhibited in associated FACs. When both FACs cannot generate this warning (double inhibit), associated amber level 2 warning message is triggered by the FWC upon slat extension and displayed on the upper ECAM DU.
(3)
Computation It consists in making a comparison between the instantaneous energy situation of the aircraft or its short term predictable situation, and the minimum energy situation for aircraft security. To do so, it is necessary:
-
To detect longitudinal winds (head wind or tail wind) combined or not with a down draft.
-
To generate a warning, independent from alpha floor, on the basis of existing structure of the same alpha floor by incrementing the angle of attack value of the aircraft with equivalent angles of attack due to wind detections. This allows a certain anticipation with respect to a normal alpha floor law mainly based on the aircraft angle of attack.
-
To display this warning and possibly to indicate that it is not available.
-Through FD or AP takeoff or go around (SRS law) modes, to follow a safe path in case of windshear detection.
(4)
Test This test permits to check that the system transmits and presents:
-visual and aural indications of the WINDSHEAR warning
-messages to indicate the loss of the function.
It is performed through the Centralized Fault Display System (CFDS)
by means of the MCDU (aircraft on ground with engines stopped).
It is activated by selecting the following functions on the MCDU:
-CFDS
-SYSTEM REPORT/TEST
-AFS.
Then it is necessary to scroll the various MCDU pages.
(Ref. Fig. 012)
NOTE : For AFS/WINDSHEAR TEST -3 & -6 pages:
____
CHECK (WARNING) ON ECAM
WINDSHEAR DET FAULT or REAC W/S DET FAULT if predictive
windshear activation.
CHECK (INOP SYS) ON ECAM STATUS PAGE
WINDSHEAR DET or REAC W/S DET if predictive windshear
activation.
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