(7)
 Install the screws (6), the washers (2) and the nuts (1).

 (8)
 Install the bonding leads (5), the screws (7) and the washers (8).

 (9)
 Install the nuts (4).

 5. Close-up
________ Subtask 34-12-51-420-052
 A. Put the aircraft back to its initial configuration.
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the ADIRUs 1FP1, 1FP2 and 1FP3 (Ref. TASK 34-12-34-400-001).

 (3)
 Lower the aircraft (Ref. TASK 07-11-00-586-002).

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____________________________________
 1.
 General

_______ The Air Data Reference (ADR) portion of the Air Data/Inertial Reference Unit (ADIRU) provides main data sources which are air data references for the aircraft avionics systems. The ADR receives and processes the outputs of the Air Data Modules (ADM) and other sensors (Ref. 34-11-00). It computes the aerodynamic parameters in the form of ARINC 429 low speed buses. For more details concerning the user systems, ref. 34-12-00.

 2.
 System Description

__________________
 A. ADR Operation
 (1) General The ADR software performs five basic computational elements which are under the air data calculations as follows:
 -pressure altitude functions (ALT/ALT rate)

 -Mach calculation (M)

 -airspeed calculation (CAS/TAS)

 -temperature calculation (SAT/TAT)
 - output signal processing.
 Aircraft-dependent calculations are also included in the operational
 software:

 -static source error correction

 -angle of attack (AOA)

 -maximum operating speed (MMO/VMO).
 The system tests include continuous in-flight monitoring and
 manually-activated test modes. The in-flight monitoring includes test
 of:

 -
input signal integrity

 -
input interface integrity

 -memory integrity

 -computational integrity
 - output signal integrity.
 The continuous monitoring detects and annunciates faults in the ADR
 during normal operation.
 Faults are stored in BITE history EEROM and sent to the Centralized
 Fault Display System (CFDS) via digital words (ref. 34-18-00).

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 (2) Inputs
 (a) Digital inputs
 1 Air Data Modules (ADM) inputs
_ The ADR receives three input buses from its corresponding ADM. These buses transmit the following input data words depending on the ADM installation: Label 242 : Total Pressure Label 176 : Left Static Pressure Label 177 : Right Static Pressure Label 245 : Averaged Static Pressure. Each of these words is a 32-bit word with the following format:
 ----------------------------------------------------------| BIT POSITION | DATA | ----------------------------------------------------------| 1 - 8 | Label | | 9 - 10 | SDI | | 11 - 28 | Pressure Value | | 29 | Sign bit (0 = positive) | | 30 - 31 | Status matrix | | 32 | Parity bit | ----------------------------------------------------------
Table 1 - ADM Input Label
 These data words are output on all eight Air Data output data buses and used for calculation of corrected pressure data.
 2 Flight Control Unit (FCU) inputs
_ The ADR receives one input bus from the FCU, for digital baro corrections. The FCU output bus sends:
 BCD label 234 Baro Correction 1(hPa) for CAPT side
 BCD label 236 Baro Correction 2(hPa) for F/O side. Each ADR receives the two FCU output bus according to the discrete selection as explained in Para. 2.A.(2)(c) (discrete inputs). Each of these words is a 32-bit BCD word with the following format:
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 -----------------------------------------------------------
| BIT POSITION | DATA |
 -----------------------------------------------------------
|  1 - 8  | Label  |
 |  9 - 10  | SDI  |
 |  11 - 28  | Value  |
 |  29  | Sign bit  |
 |  30 - 31  | Status matrix  |
 |  32  | Parity  |

 -----------------------------------------------------------Table 2 - FCU Input Label
 3 Centralized Fault Display Interface Unit (CFDIU) input
_ For maintenance purposes, the ADR receives one input bus from the CFDIU. For more details, ref. 34-18-00.
　
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