R 1EFF : 051-099, 106-149, 201-299, 301-399, 1 34-51-00Page 28 1401-499, 1Aug 01/05 1 1 1CES 1 for 2 seconds, No Computed Data for 2 seconds, and then a continuous self-test indication. The DME stays in self-test until released. While the self-test procedure is being performed, the DME continues to calculate distance, except when the fault monitor test is initiated.
**ON A/C ALL
B. DME Antenna (Ref. Fig. 007) The L-band antenna is an airborne antenna for the DME interrogator. It is a blade type with a radiating cavity driven by capacitive coupling. This antenna is designed for installation on fast aircraft and operation within the L-band from 960 to 1250 MHz.
6. Operation
_________
**ON A/C 001-049, 051-099, 101-105, 151-199,
(Ref. Fig. 002)
R **ON A/C 106-149, 201-299, 301-399, 401-499,
(Ref. Fig. 002A)
**ON A/C ALL
A. Control
-Each DME interrogator is connected to one RMP. The DME interrogator 1 is connected to the RMP 1 (DME interrogator 2 to RMP 2). The RMP 1 also receives the management bus from the FMGC 1 (RMP 2 from FMGC 2).
-In normal operation the FMGC 1(2) tunes the DME interrogator 1(2) either automatically or manually by means of the MCDU 1(2). In this case the RMP 1(2) operates as a relay which sends the frequency information from the FMGC 1(2) to the DME interrogator 1(2).
-By a second port, the DME interrogator 1(2) receives a second management bus directly from the FMGC 2(1). The interrogator selects one of the two port functions by a discrete signal coming from the FMGC 1(2) through the RMP 1(2).
-In case of one FMGC fault, the other FMGC can control the two DME interrogators, one directly, the other through its RMP.
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DME - Antenna Figure 007
1EFF : 1 1R 1CES ALL 1 11 1 34-51-00 Page 30 May 01/05
-
In case of the RMP 1(2)fault, the concerned RMP is transparent to data and discrete coming from the FMGC.
-
In manual operation (at any time or with failure of the two FMGCs), the RMP 1 can control the DME interrogator 1 after ON NAV mode selection. Same possibility for the RMP 2 (DME interrogator 2). (Ref. Fig. 008)
-
In addition, a suppressor coaxial connects the ATC transponders to the DME interrogators. This prevents transmission from one system while the other is in reception mode. This is necessary because the DME and the ATC systems operate on the same frequency range.
B. Reconfiguration Switching In normal utilization, the DME 1 and 2 data are shown on both CAPT and F/O NDs through the Display Management Computer (DMC 1(2)). ILS/DME data are shown on both CAPT and F/O PFDs. In caes of DMC 1(2) fault, it is possible to switch over to the DMC 3 with the EIS DMC selector switch. This selector switch is located on panel 8VU on the center pedestal. In this case, the DMC 3 totally replaces the DMC 1(2) through the stage of the output switching relay of the failed DMC. In case of PFD fault, there is an automatic transfer of the PFD image onto the ND. In case of ND fault: you obtain the transfer of the ND image onto the PFD when you push the PFD/ND XFR pushbutton switch on panel 301VU (501VU). When you set the PFD potentiometer to OFF on panel 301VU (501VU), this causes :
-deactivation of the PFD
-transfer of the PFD image onto the ND.
7. BITE Function
_____________
R **ON A/C 001-049, 101-105, 151-199,
(Ref. Fig. 009)
A. Access to DME Sub-menu Functions It is possible to select the maintenance functions of the DME interrogator 1(2) by pressing the line key adjacent to the SYSTEM REPORT/TEST indication on the CFDS menu, and then selecting the relevant DME on the NAV menu. After these actions the DME 1(2) provides its own menu page and the sub-menu functions can then be chosen by the operator.
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DME - Frequency Selection in Emergency Mode Figure 008
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DME - Maintenance Test Procedure Figure 009
1EFF : 1 1R 1CES ALL 1 11 1 34-51-00 Page 33 May 01/05
B. Activation of the Test Function The DME 1(2) test function can be activated in ground conditions only by pressing the line key adjacent to the TEST indication on the DME 1(2) maintenance sub-menu or by pressing the TEST pushbutton switch as designed on the front panel LCD (For more details see para. 7.D.).
R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
(Ref. Fig. 009)
A. Access to DME Sub-menu Functions It is possible to select the maintenance functions of the DME interrogator 1(2) by pressing the line key adjacent to the SYSTEM REPORT/TEST indication on the CFDS menu, and then selecting the relevant DME on the NAV menu. After these actions the DME 1(2) provides its own menu page and the sub-menu functions can then be chosen by the operator.
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