A320飞机维护手册 AMM NAVIGATION 导航2(141)_航空信息_民用航空_通用航空

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R detectors
R - sets or resets bits in the status byte for low glide
R slope/localizer signal levels, glide
R slope/localizer-detector abnormal DC levels or no
R transmission on the ARINC bus
R - sets the Sign Status Matrices (SSM), based on the status
R byte settings
R - sends deviation and status data to the system processor
R - individually compares the glide slope and localizer SSMs
R transmitted by the ARINC Universal Asynchronous Receiver
R Transmitter (UART) to its own computed SSMs, and sets a bit
R in the corresponding status byte if the SSM of ARINC
R transmission is less restrictive than the computed one.
R If both transmitted and computed SSMs are normal, then the
R emitted deviation data are compared to the DSP deviations.
R - stops the transmission of the ARINC bus if the SSM
R comparison is incorrect or if the control of the SSM is
R lost, or if the transmitted deviation data are outside a
R pre-determined limit.

R 1EFF : 051-060, 1 34-36-00Page 27 1 1 Config-1 May 01/05 1 1 1CES 1

R 2_ System processor
R The system processor functions as the ILS input/output data
R handler.
R The system processor:
R - receives and processes data from the ARINC UART (it
R determines the validity of input tuning frequency, and
R transmits valid commands to the localizer and glide slope
R synthesizers)
R - monitors and processes the discrete inputs
R - compares the localizer and glide slope data received from
R the primary DSP to the data received from the monitor DSP.
R If the result of the comparison is outside pre-determined
R limits, the data are declared failed
R - transmits data to the primary ARINC UART
R - monitors the data words sent on the ARINC bus.
R - determines the system power supply status
R - provides fault data to the BITE processor
R - conveys data received from the BITE processor for
R transmission onto the ARINC 429 output bus.
R (d) BITE processor
R The BITE processor:
R - receives and decodes control and data words from the
R Centralized Fault Display Interface Unit (CFDIU) and transfers
R interactive or normal mode data to the system processor
R - processes data received from the system processor, for storage
R in the non-volatile fault memory.
R - decodes Morse code station identification and transfers the
R ident word to the system processor.
R (e) Power supply unit
R The power supply unit converts the aircraft 115VAC-400 Hz input
R into the +5VDC, +12VDC, -12VDC and -5VDC necessary to the ILS
R receiver operation.
R (f) Test modes
R In addition to the approach operating mode, the ILS has three
R test modes:
R - the functional test
R - the receiver face test
R - the power-on test.
R 1_ Functional test
R It is initiated on request from the MCDU, under the following
R conditions:
R - tune/test inhibit discrete not active
R - A/C on ground.

R 1EFF : 051-060, 1 34-36-00Page 28 1 1 Config-1 May 01/05 1 1 1CES 1R Upon recognition of a valid functional test request, the R system processor initiates the following sequence:

R --------------------------------------------------------------------------R | DURATION | PFD and ND | R --------------------------------------------------------------------------
R |Approx. 3 s.
R |
R |
R |Approx. 2 s.
R |
R |
R |
R |Approx. 3 s.
R |
R |
R |
R |Approx. 2 s.
R |
R |
R |
R |Approx. 2 s.
R |
R |
R |
R |Approx. 4 s.
R |(total duration:
R |16 s)
R |
R |