L/G - Lever Does Not Move - Retraction Inhibit Baulk Solenoid Does Not Release

TASK 32-31-00-810-885-A
L/G - Lever Does Not Move - Retraction Inhibit Baulk Solenoid Does Not Release

1. Possible Causes

LEVER-L/G NORM CTL [6GA]
aircraft wiring/connectors
LGCIU-1 [5GA1]
LGCIU-2 [5GA2]

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	MULTIMETER - STANDARD

B. Referenced Information

REFERENCE	DESIGNATION
AMM 32-31-00-720-002	Functional Test of the Normal Extension and Retraction of the Landing Gear
ASM 323105
ASM 323106
AMM 32-31-11-000-001	Removal of the Landing Gear Normal Control lever
AMM 32-31-11-400-001	Installation of the Landing Gear Normal Control Lever
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU

3. Fault Confirmation
Subtask 32-31-00-710-075-A

A. Test
(1) If the L/G lever does not move to the UP position during a L/G retraction, do the Functional Test of the Normal Retraction and Extension of the Landing Gear AMM 32-31-00-720-002:

if the control lever does not move, because the retraction inhibit baulk solenoid does not release correctly, do the fault isolation procedure in Para. 4.A. (1)
if the control lever moves correctly, when LGCIU 1 only is in control, do the fault isolation procedure in Para. 4.A.(7)
if the control lever moves correctly, when LGCIU 1 only is in control and also when LGCIU 2 only is in control, then no more maintenance work is necessary.

NOTE: System 1 and System 2 each operate the baulk solenoid circuit independently. Thus for the baulk solenoid circuit not to operate there must be two faults, one in each system. Thus it is necessary to isolate System 2 and trouble shoot System 1, then isolate System 1 and trouble shoot System 2.

4. Fault Isolation
Subtask 32-31-00-810-143-A

A. Procedure
(1) If the Post Flight Report (PFR) shows a shock-absorber proximity-sensor maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 32-31-00-865-063-A

B. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

Subtask 32-31-00-810-144-A

C. Procedure
(1) Open the C/B 2GA (this will put LGCIU 1 only in control).
(2) At the L/G Control Lever, get access to connector A, AMM 32-31-11-000-001.
(a) Disconnect the connector A.
(b) Use a MULTIMETER - STANDARD to measure 28VDC at pin W on the free-end of connector A, ASM 323105:

if there is 28VDC, do step (3)
if there is not 28VDC, do step (4).

(3) Replace the LEVER-L/G NORM CTL [6GA] , AMM 32-31-11-400-001:

if the fault continues, do step (4)
if the fault goes, do step (7).

(4) Do a check and repair as necessary the aircraft wiring/connectors between pin W on the free-end of connector A and pin AA-7F on the LGCIU 1 ARINC tray AMM 32-31-71-000-001 and AMM 32-31-71-400-001, ASM 323105.

NOTE: It is good practice to check the two connectors to the L/G lever assembly, to make sure that all the pins are installed correctly.

(a) Install the L/G control lever 6GA AMM 32-31-11-400-001 and make sure the applicable connector pins engage correctly.
(b) Do the test in Para. 3.A.:

if the fault continues, do step (5).
if the fault goes, do step (6)

(5) Replace the LGCIU-1 [5GA1] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(a) Do the test in Para. 3.A. and make sure that System 1 operates the L/G correctly, then do the procedure for System 2 at step (7).
(6) Open the C/Bs 1GA and 52GA, and close the C/B 2GA (this will put LGCIU 2 only in control).

NOTE: LGCIU 2 will do a power-up BITE which will take approximately 60 seconds.

(7) At the L/G Control Lever, get access to connector B, AMM 32-31-11-000-001.
(a) Disconnect the connector B.
(b) Use a MULTIMETER - STANDARD to measure 28VDC at pin J on the free-end of connector B, ASM 323105:

if there is 28VDC, do step (8)
if there is not 28VDC, do step (9).

(8) Replace the LEVER-L/G NORM CTL [6GA] , AMM 32-31-11-400-001.

if the fault goes, do step (11)
if the fault continues, do step (9).

(9) Do a check and repair as necessary the aircraft wiring/connectors between pin J on the free-end of connector B and pin AA-7F on the LGCIU 2 ARINC tray, AMM 32-31-71-000-001 and AMM 32-31-71-400-001, ASM 323106.
(a) Install the L/G control lever 6GA AMM 32-31-11-400-001 and make sure the applicable connector pins engage correctly.
(b) Do the test in Para. 3.A.:

if the fault goes, do step (11)
if the fault continues, do step (10).

(10) Replace the LGCIU-2 [5GA2] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001,
(a) Do the test in Para. 3.A. and make sure that System 2 operates the L/G correctly, then do step (11).
(11) Close the C/Bs 1GA and 52GA and return the aircraft to its initial condition.

[Rev.8 from Aug 2018] 2026.04.04 04:31:26 UTC