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 (b)
 First Officer side ADIRU 2 supply: Ref. Para. (1)(b).

 (c)
 Standby side The ADIRU 3 is no more supplied with 115VAC. The ADIRU 3 is still powered with 28VDC from the 28VDC HOT BUS 701PP. The ADR 3 function is lost immediately. The IR 3 function is available.

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 D. Circuit Breakers
 The system is supplied through these circuit breakers:

 -----------------------------------------------------------------------------FIN PANEL/ DESIGNATION BUS ATA. REF. AMM LOCATION P. BLOCK 001
 -----------------------------------------------------------------------------4FP1 49VU NAV AND PROBES/ADIRU1/115VAC 801XP-A 34-11-00 4FP2 121VU ADIRS/ADIRU/2/115VAC 204XP-C 34-11-00 4FP3 121VU ADIRS/ADIRU/3/115VAC 101XP-C 34-11-00 5FP1 49VU NAV AND PROBES/ADIRU1 & 431XP-A 34-11-00 AOA/26VAC 5FP2 121VU ADIRS/ADIRU/2/26VAC AND AOA 231XP-A 34-11-00 5FP3 121VU ADIRS/ADIRU/3/26VAC AND AOA 131XP-A 34-11-00 6FP1 105VU ADIRS/ADIRU1/28VDC 704PP 34-11-00 6FP2 121VU ADIRS/ADIRU/2/28VDC 702PP 34-11-00 6FP3 121VU ADIRS/ADIRU/3/28VDC 701PP 34-11-00 8FP 49VU NAV AND PROBES/ADIRU 3/ 401PP 34-11-00 SWTG/SPLY 9FP 121VU ADIRS/ADIRU/3 SWTG/SPLY 301PP 34-11-00
 10FP 121VU ADIRS/ADIRU/2 PWR/SHED 206PP 34-11-00 1DA1 122VU ANTI ICE/PROBES/1/TAT 101XP-A 30-31-00 1DA2 122VU ANTI ICE/PROBES/2/TAT 202XP-C 30-31-00 2DA1 49VU ANTI ICE/PROBES/PHC/1 401PP 30-31-00 2DA2 122VU ANTI ICE/PROBES/2/PHC 206PP 30-31-00 2DA3 122VU ANTI ICE/PROBES/PHC/3 101PP 30-31-00 3DA1 49VU ANTI ICE/PROBES/PITOT/1 401XP-B 30-31-00 3DA2 122VU ANTI ICE/PROBES/2/PITOT 202XP-B 30-31-00 3DA3 122VU ANTI ICE/PROBES/3/PITOT 103XP-C 30-31-00 4DA1 49VU ANTI ICE/PROBES/1/AOA 801XP-C 30-31-00 4DA2 122VU ANTI ICE/PROBES/2/AOA 202XP-B 30-31-00 4DA3 122VU ANTI ICE/PROBES/3/AOA 103XP-C 30-31-00 5DA1 122VU ANTI ICE/PROBES/1/STATIC 101PP 30-31-00 5DA2 122VU ANTI ICE/PROBES/2/STATIC 206PP 30-31-00 5DA3 122VU ANTI ICE/PROBES/3/STATIC 103PP 34-11-00
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 4. Component Description
_____________________
 A. Static Probes (Ref. Fig. 004) Each of the three systems (CAPT (1), F/O (2), STBY (3)) comprises two static probes which are linked to each ADR portion of the ADIRUs through five ADMs. The probe is protected from icing with a 28VDC heater circuit. The static probes linked to ADIRU 1 and ADIRU 2 are set at 48.64 deg. below the fuselage datum line (Z=0). The static probes linked to ADIRU 3 are set at 29.5 deg. below the fuselage datum line.
 B. Pitot Probes (Ref. Fig. 005) Each system comprises one pitot probe (CAPT (1), F/O (2), STBY (3)) which is linked to each ADR portion of the ADIRUs through one ADM. The probe is protected from icing with a 115VAC - 400 Hz heater circuit. The pitot probes 1 and 2 are set at 40.08 deg. below the fuselage datum line (Z=0). The pitot probe 3 is set at 59.56 deg. below the fuselage datum line (Z=0).
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 ADIRS - Static Probe
 Figure 004

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 ADIRS - Pitot Probe
 Figure 005

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 C. Air Data Modules (ADM)
 **ON A/C 051-061,
 (Ref. Fig. 006)

R **ON A/C 062-099, 106-149, 204-299, 301-399, 401-499,
 (Ref. Fig. 006A)

R **ON A/C 051-099, 106-149, 204-299, 301-399, 401-499,
 The term Air Data Module (ADM) refers to any remotely located LRU which senses pressure information and transmits it to the ADIRU in ARINC 429 format. The ADMs are remotely mounted near and above the level of the pitot and static probes, this in order to make the ADM pneumatic plumbing self draining when the aircraft is stationary on the ground.
 (1) Internal description
 The ADM comprises the following components
 (Ref. Fig. 007)

 (a)
 Transducer board This device provides two signals (Pressure Time Pulse (PTP) and Temperature Time Pulse (TTP)) used by the processor board.

 (b)
 Processor board The microcomputer comprises the following circuits:

 -a micro-controller 80C31
 -two memories: ROM (storage of software program) and RAM (temporary storage of data)
 -
a Non Volatile Memory (NVM) (Storage of transducer modelling coefficients and failure information)

 -
a RS-232C Serial Digital Input/Output (used for bench test and calibration purposes)
　
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