Radio Altimeter - Maintenance Test Procedure Figure 008
R 1EFF : 1 1 1CES ALL 1 111 34-42-00 Page 23 May 01/04
Radio Altimeter - Maintenance Test Procedure
Figure 008A
R 1EFF : 001-004, 1 34-42-00Page 24 1 1 May 01/04 1 1 1CES 1 B. Activation of the Test Function
(1) ARINC TEST The RA ARINC TEST function can be activated by pressing the line key adjacent to the corresponding indication on the RA maintenance sub-menu or by pressing the pushbutton switch on the face of the transceiver. The following sequence is then generated on the output of the equipment:
-------------------------------------------------------------------------------| DURATION | LED STATUS | MESSAGE | |-----------------------|---------------------------|-------------------------| | 0.8 s | ALL ON | FUNCTIONAL TEST | | See NOTE | GREEN ON | ALTITUDE VALUE : | | | | 40 FEET | -------------------------------------------------------------------------------
NOTE : The green LED remains on :
____ -until the test sub-menu mode is deactivated.
- or until the pushbutton switch on the face of the transceiver is released.
(2) RAMP TEST The RAMP TEST function can be activated from the MCDU by pressing the line key adjacent to the SYSTEM REPORT/TEST indication on the CFDS menu then selecting the LRRA 1 (LRRA2) on the NAV menu and then selecting the RAMP TEST page. On the RAMP TEST page select :
-START ALT : 0 ft.
-STOP ALT : 2500 ft.
-SLOPE : 25 ft./s. Push the line key adjacent to the TRIGGER indication. On the PFD :
*
the ramp test starts, it moves up to 2500 ft. it stops after approximately 1 minute 40 seconds.
*
when the altitude is between 0 and 160 ft. the horizon line moves down. The elevation scale comes into view.
*
when the altitude is between 0 and 570 ft. the red ribbon adjacent to the altitude scale moves down and then it goes out of view.
- on the MCDU, at the altitude 2500 ft. the RAMP TEST STOPPED page comes into view.
R 1EFF : ALL 1 34-42-00Page 25 1 1 May 01/04 1 1 1CES 1 **ON A/C 001-004,
Post SB 34-1171 For A/C 001-004,
It is possible to select the maintenance functions of the radio altimeter transceiver 1(2) by pressing the line key adjacent to the SYSTEM REPORT/TEST indication on the CFDS menu, and then selecting the relevant RA on the NAV menu. After these actions the RA 1(2) provides its own menu page and the sub-menu functions can then be chosen by the operator.
NOTE : The test can be performed on the ground only. It is inhibited
____ (the EIU1 (EIU2) sends a ground discrete to the RA1 (RA2)) as soon as N2 rating (high pressure compressor rotational speed) is greater than minimum idle rating.
B. Activation of the Test Function
(1)
Self-Test The self-test can be activated by pushing the TEST pushbutton switch as designed on the front panel LCD, if the test inhibit discrete is not active. A "TEST IN PROGRESS" message is displayed approximately one second after the TEST pushbutton is pressed. At the end of the self-test, either a TEST COMPLETE, NO FAILURES message screen or a TEST COMPLETE, FAILURES message screen is displayed. The TEST COMPLETE, NO FAILURES screen contains two pushbutton selections (MAINT and RETURN). The TEST COMPLETE, FAILURES screen also contains two pushbutton selections (MAINT and WHY?). For both screens, pressing the left (MAINT) pushbutton initiates the extented maintenance pages of the system for troubleshooting. The right (RETURN) pushbutton associated with the TEST COMPLETE, NO FAILURES screen returns the system to its normal mode screen. The right (WHY?) pushbutton associated with the TEST COMPLETE, FAILURES screen places the system in the display-failures mode where individual system failures (fault memory codes) are displayed, one per page.
(2)
RAMP TEST The RAMP TEST function can be activated from the MCDU by pressing the line key adjacent to the SYSTEM REPORT/TEST indication on the CFDS menu then selecting the RA1 (RA2) on the NAV menu and then selecting the RAMP TEST page. The RA then begins simulating a ramp starting from 500 ft. down to 0 ft. (with a slope of 10 ft/s from 500 ft. to 50 ft. and approximately 3 ft/s from 50 ft. to 0 ft.).
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