Loss of the Nose Wheel Steering due to a Failure of the Proximity Sensors of the Landing Gears

TASK 32-51-00-810-843-A
Loss of the Nose Wheel Steering due to a Failure of the Proximity Sensors of the Landing Gears

1. Possible Causes

PROX SNSR-R L/G DNLK, SYS 1 [14GA]
PROX SNSR-R L/G DNLK, SYS 2 [16GA]
PROX SNSR-L L/G DNLK, SYS 1 [15GA]
PROX SNSR-L L/G DNLK, SYS 2 [17GA]
PROX SNSR-NLG DNLK, SYS 1 [18GA]
PROX SNSR-NLG DNLK, SYS 2 [19GA]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 32-31-00-810-822-A	RLG Downlock Proximity Sensor Fault
TSM TASK 32-31-00-810-823-A	LLG Downlock Proximity Sensor Fault
TSM TASK 32-31-00-810-824-A	NLG Downlock Proximity Sensor Fault
AMM 32-46-00-740-001	BITE Test of the BSCU
AMM 32-69-00-740-001	BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative

3. Fault Confirmation
Subtask 32-51-00-740-110-A ** ON A/C NOT FOR ALL

A. Test
(1) Do a BITE test of the LGCIU 1 (2) AMM 32-69-00-740-001.

4. Fault Isolation
Subtask 32-51-00-810-106-A ** ON A/C NOT FOR ALL

A. If the BITE test of the LGCIU 1 (2) gives a maintenance message related to the landing gear proximity-sensors:
(1) Do the trouble shooting procedures below:

(Ref. TSM TASK 32-31-00-810-822) for a maintenance message related to PROX SNSR-R L/G DNLK, SYS 1 [14GA] or PROX SNSR-R L/G DNLK, SYS 2 [16GA] .
(Ref. TSM TASK 32-31-00-810-823) for a maintenance message related to PROX SNSR-L L/G DNLK, SYS 1 [15GA] or PROX SNSR-L L/G DNLK, SYS 2 [17GA] .
(Ref. TSM TASK 32-31-00-810-824) for a maintenance message related to PROX SNSR-NLG DNLK, SYS 1 [18GA] or PROX SNSR-NLG DNLK, SYS 2 [19GA] .

(2) Do a reset of the BSCU with the A/SKID AND NOSE WHEEL switch (5GG).
(3) Do the BITE test of the BSCU AMM 32-46-00-740-001.

[Rev.8 from Aug 2018] 2026.04.04 04:31:51 UTC