Loss of the ADIRU3 Input Signal from the SFCC

TASK 34-13-00-810-933-A
Loss of the ADIRU3 Input Signal from the SFCC

1. Possible Causes

SLAT/FLAP CONTR.COMP. [21CV]
ADIRU-3 [1FP3]
wiring
SLAT/FLAP CONTR.COMP. [22CV]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 31-32-00-810-932-A	Failure of the Discrete Links
AMM 27-50-00-866-008	Extension of the Flaps on the Ground
AMM 27-50-00-866-009	Retraction of the Flaps on the Ground
ASM 275110
AMM 27-51-34-000-001	Removal of the SFCC
AMM 27-51-34-400-001	Installation of the SFCC
AMM 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU
AMM 34-13-00-740-002	INTERFACE TEST of the ADR
AMM 34-13-00-740-005	Read the CFDIU for the ADR INPUT STATUS
ASM 341302

3. Fault Confirmation
Subtask 34-13-00-740-249-B

A. Test
(1) Do the interface test of the ADR (system 3) AMM 34-13-00-740-002.

4. Fault Isolation
Subtask 34-13-00-810-183-B

A. If the test gives the SFCC1(21CV)/SFCC2(22CV)/ ADIRU3 (1FP3) maintenance message:
(1) Put the aircraft in each of the configurations given below AMM 34-13-00-740-005.
(a) Retract the flaps to the 0 position AMM 27-50-00-866-009.

Do a check of the input discrete statuses with the ADR CURRENT STATUS page of ADIRU3:
AOA Correction Discrete 1A (Pin AA/2J) = OPN
AOA Correction Discrete 1B (Pin AA/12F) = OPN
AOA Correction Discrete 2A (Pin AA/11F) = OPN
AOA Correction Discrete 2B (Pin AA/14F) = OPN
SSEC Select 1 Discrete (Pin AA/2H) = OPN
SSEC Select 2 Discrete (Pin AA/2K) = OPN.

(b) Extend the flaps to the 1 position AMM 27-50-00-866-008.

Do a check of the input discrete statuses with the ADR CURRENT STATUS page of ADIRU3:
AOA Correction Discrete 1A (Pin AA/2J) = GND
AOA Correction Discrete 1B (Pin AA/12F) = OPN
AOA Correction Discrete 2A (Pin AA/11F) = GND
AOA Correction Discrete 2B (Pin AA/14F) = OPN.

Do a check of the input discrete statuses with the ADR CURRENT STATUS page of ADIRU3:
AOA Correction Discrete 1A (Pin AA/2J) = GND
AOA Correction Discrete 1B (Pin AA/12F) = GND
AOA Correction Discrete 2A (Pin AA/11F) = GND
AOA Correction Discrete 2B (Pin AA/14F) = GND
SSEC Select 1 Discrete (Pin AA/2H) = GND
SSEC Select 2 Discrete (Pin AA/2K) = GND.

(2) If one of the statuses related to AOA correction discrete 1A, 1B or SSEC select 1 discrete is not correct:
(a) Replace the SLAT/FLAP CONTR.COMP. [21CV] AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
(b) If the fault continues:

Replace ADIRU-3 [1FP3] AMM 34-12-34-000-001 and AMM 34-12-34-400-001.

Pin AA/2J of ADIRU3 (1FP3) and the first terminal block
Pin AA/12F of ADIRU3 (1FP3) and the first terminal block
Pin AA/2H of ADIRU3 (1FP3) and the first terminal block ASM 341302.

(d) If the fault continues:

Do the troubleshooting procedure (Ref. TSM TASK 31-32-00-810-932) related to the discrete output signal (FAP£5, pin AB/8K) of SFCC1 (21CV) ASM 275110.

(3) If one of the statuses related to AOA correction discrete 2A, 2B or SSEC select 2 discrete is not correct:
(a) Replace the SLAT/FLAP CONTR.COMP. [22CV] AMM 27-51-34-000-001 and AMM 27-51-34-400-001.
(b) If the fault continues:

Replace ADIRU-3 [1FP3] AMM 34-12-34-000-001 and AMM 34-12-34-400-001.

Pin AA/11F of ADIRU3 (1FP3) and pin AB/8D of SFCC2 (22CV)
Pin AA/14F of ADIRU3 (1FP3) and pin AB/10H of SFCC2 (22CV)
Pin AA/2K of ADIRU3 (1FP3) and the first terminal block ASM 341302.

(d) If the fault continues:

Do the troubleshooting procedure (Ref. TSM TASK 31-32-00-810-932) related to the discrete output signal (FAP£3, pin AB/8F) of SFCC2 (22CV) ASM 275110.

Subtask 34-13-00-740-250-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:29 UTC