(1) Optional system
Table 12 : IR Data Users - Basic version
(e) Analog outputs The ADIRUs, through analog outputs, supply the ADMs with +13.5/-13.5VDC and the CDU with 28VDC.
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-12-00Page 21 1 1 Config-1 May 01/05 1 1 1CES 1 **ON A/C 151-199,
(f) Discrete outputs The discrete outputs are either open/ground or open/28VDC discretes (for ON BAT, IR FAILURE WARNING and ALIGN NOT READY discretes). The LOW SPEED WARNING discretes are set according to a speed threshold (with an hysteresis of 4 knots). These thresholds are respectively:
---------------------------------|Lower threshold|Upper threshold|
| value | value |
--------------------------|---------------|---------------|
| LOW SPEED WARNING 1 | 100 | 104 |
| LOW SPEED WARNING 2 | 50 | 54 |
| LOW SPEED WARNING 3 | 155 | 159 |
| LOW SPEED WARNING 4 | 260 | 264 |
-----------------------------------------------------------
The LOW SPEED WARNING 1 discrete is used in the Ram Air Turbine
extension logic and in the power generation logic. The LOW SPEED
WARNING 2 discrete is used in the power generation logic.
The following discretes are used to control the CDU annunciators:
-ON BAT
-
ADR OFF
-
ADR FAILURE WARNING
-
IR FAILURE WARNING
-
IR ALIGN.
R **ON A/C 001-049, 101-105, 151-199, 201-203,
4. Component Description
_____________________
A. ADIRS CDU (Ref. Fig. 005) The CDU is a three-channel unit. Each CDU channel is dedicated to one separate ADIRU and includes the following features:
-a three-position mode selector switch. The modes are: . power off (OFF) . navigation (NAV) . reversionary attitude (ATT)
-
an indicator announcing when the IR is aligning (ALIGN legend of IR annunciator)
-
an IR fault indicator (FAULT legend of IR annunciator)
R 1EFF : 001-049, 101-105, 151-199, 201-203, 1 34-12-00Page 22 1 1 Config-1 May 01/05 1 1 1CES 1
ADIRS CDU Figure 005
R 1EFF : 1 1 1CES 001-049, 101-105, 151-199, 201-203, 1 111 Page 2334-12-00 Config-1 May 01/05
-a pushbutton switch to disable ADR output buses. It is a momentary action pushbutton switch
-
an indicator announcing when the ADR output buses are turned off (OFF legend of ADR pushbutton switch)
-
an ADR fault indicator (FAULT legend of ADR pushbutton switch). The following items of equipment are shaped between the three channels :
-a keyboard to enter the initial position in degrees, minutes and tenth of minutes or magnetic heading in the attitude mode
-two data pushbutton switches (ENT and CLR) with cue lights
-
a liquid crystal display for selected parameters. The LCD has 16 digits and each digit has 14 segments
-
a DATA DISPLAY selector switch to select parameters for display on the LCD:
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