(2)
 Make sure that the ground safety locks are installed on the landing gear (Ref. TASK 32-00-00-481-001).

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 (3)
 On the panel 400VU:

 -make sure that the landing-gear control-lever 6GA is in the DOWN position
 -put a warning notice in position to tell persons not to operate the landing gear and the MLG doors.

 (4)
 Put the warning notice(s) in position to tell persons not to pressurize the Green Hydraulic system: - on the panel 40VU in the cockpit - on the ground service panel of the Green Hydraulic system, access

 door (197CB).
 Subtask 32-31-73-860-059
 B. Aircraft Maintenance Configuration
 (1)
 Make sure that the Green hydraulic system is depressurized. (Ref. TASK 29-10-00-864-001).

 (2)
 If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002). Then, it is not necessary to open the LGCIU circuit breakers.

 (3)
 If the electrical power is necessary, do the precautions for flight configuration (Ref. TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.

 Subtask 32-31-73-582-057
 C. Lift the Aircraft
 (1) Lift the aircraft on jacks (Ref. TASK 07-11-00-581-001).
 Subtask 32-31-73-010-056
 D. Get Access
 (1)
 Put the access platform in position below the applicable zone 734(744).

 (2)
 Open the applicable MLG door (Ref. TASK 32-12-00-010-001).

 (3)
 Make sure that the GROUND LOCK SLEEVE is installed on the applicable MLG door actuator.

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 Subtask 32-31-73-865-071
 E. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
49VU L/G/LGCIU/SYS1/NORM 1GA C09 121VU HYDRAULIC/LGCIU/SYS2 2GA Q35 121VU HYDRAULIC/LGCIU/SYS1/GRND SPLY 52GA Q34
 4. Procedure
_________
 **ON A/C 001-003, 051-052,

 (Ref. Fig. 505/TASK 32-31-73-991-017-A) R **ON A/C 004-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 505A/TASK 32-31-73-991-017-B)
 **ON A/C 001-003, 051-052,

 (Ref. Fig. 506/TASK 32-31-73-991-032-A) R **ON A/C 004-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 506A/TASK 32-31-73-991-032-B)
 **ON A/C ALL

 Subtask 32-31-73-220-081
 A. Dimensional Check
 (1) Measure the dimensions that follow for the rear proximity sensors 20GA(21GA) (System 1):
 -
dimension X 3.9 mm (0.1535 in.) to 4.1 mm (0.1614 in.)

 -
dimension Z 1.4 mm (0.0551 in.) to 1.6 mm (0.0629 in.).

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 INTENTIONALLY BLANK

R 1 1
32-31-73Page 525
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 MLG Extension Proximity Sensor Dimensions 20GA, 21GA, 22GA, 23GA Figure 505/TASK 32-31-73-991-017-A12 (SHEET 1)
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 MLG Extension Proximity Sensor Dimensions 20GA, 21GA, 22GA, 23GA Figure 505/TASK 32-31-73-991-017-A22 (SHEET 2)
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 MLG Extension Proximity Sensor Dimensions 20GA, 21GA, 22GA, 23GA
 Figure 505A/TASK 32-31-73-991-017-B

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 MLG Extension Proximity Sensors 20GA, 21GA, 22GA, 23GA Figure 506/TASK 32-31-73-991-032-A
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 MLG Extension Proximity Sensors 20GA, 21GA, 22GA, 23GA
 Figure 506A/TASK 32-31-73-991-032-B

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 (2)
 Measure the dimensions that follow for the forward proximity sensors 22GA(23GA) (System 2):

 -
dimension X 3.9 mm (0.1535 in.) to 4.1 mm (0.1614 in.)

 -
dimension Z 1.4 mm (0.0551 in.) to 1.6 mm (0.0629 in.).

 (3)
 If the dimensions are correct, do the check of the proximity switch detection range in Para. 4.B.

 (4)
 If the dimensions are incorrect, do the adjustment procedure in Para.
　
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