(10)
Turn system B hydraulic pump off. Ensure brake pressure remains at approximately 3000 psi.
NOTE: If brake pressure decreases, brake metering valves or brake check valves may be leaking internally.
(11)
Apply just enough pressure to rudder pedals for parking brake light to go off. Ensure brake pressure decreases approximately 100 psi.
(12)
Record pressure registered on brake pressure gages.
(13)
Depress left brake pedal fully and record pressure registered on brake pressure gages after 50 seconds.
(14)
If pressure recorded in step (13) decreases to 50 psi above pressure recorded in step (5) in 50 seconds or less, the applicable antiskid valve should be replaced:
(a)
If system A pressure decreases beyond limits, replace left inboard antiskid valve.
(b)
If system B pressure decreases beyond limits, replace left outboard valve.
(15)
Repeat steps (4) thru (12).
(16)
Depress right brake pedal fully and record pressure registered on brake pressure gages after 50 seconds.
(17)
If pressure recorded in step (16) decreases to 50 psi above pressure recorded in step (5) in 50 seconds or less, the applicable antiskid valve should be replaced:
(a)
If system A pressure decreases beyond limits, replace right inboard antiskid valve.
(b)
If system B pressure decreases beyond limits, replace right outboard antiskid valve.
(18)
Close ground interconnect valve.
500
May 20/82 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-42-31 Page 601
ANTISKID LANDING GEAR LEVER UP SWITCHES - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Gear Ground Lock Assembly (Ref 32-00-01)
2. Remove Antiskid Landing Gear Up Switches
A. Ensure gear ground lock assembly is installed in nose gear (Ref 32-00-01).
B. Open OUTBD ANTI-SKID and INBD ANTI-SKID circuit breakers.
C. Open forward nose compartment access door.
D. Disconnect electrical leads from antiskid landing gear up switches (Fig. 401).
E. Remove bolts, with spacers, attaching switch support channel to support bracket. Remove support channel containing switches.
F. Remove switch assembly from support channel.
G. Remove switch from switch actuating assembly.
3. Install Antiskid Landing Gear Up Switches
A. Install switch in actuating assembly (Fig. 401).
B. Install switch assembly in support channel.
C. Position support channel in place and install mounting bolts and spacers. Do not tighten.
D. Connect electrical leads to switch terminals.
E. Close circuit breakers opened in 1.A.
F. Adjust switch (Ref Antiskid Landing Gear Up Switches - Adjustment/Test).
500
May 20/82 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-42-51 Page 401
Landing Gear Lever Up Switches Installation 500
32-42-51 Figure 401 Aug 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
ANTISKID LANDING GEAR LEVER UP SWITCHES - ADJUSTMENT/TEST
1. Antiskid Landing Gear Lever Up Switches - Adjustment
A. Equipment and Materials
(1)
Gear Ground Lock Assemblies (Ref 32-00-01)
(2)
Ohmmeter
B. Prepare to Adjust Landing Gear Lever Up Switches
(1)
Open OUTBD ANTI-SKID and INBD ANTI-SKID circuit breakers on P6 panel are open.
(2)
Check that gear ground lock assemblies are installed (Ref 32-00-01).
(3)
Check that hydraulic system A is depressurized (Ref 29-11-0, Maintenance Practices).
(4)
Open forward nose compartment access door.
(5)
Place landing gear lever in DN position.
C. Adjust Antiskid Landing Gear Lever Up Switches
(1)
Connect ommeter across terminals of each switch and check that ohmmeter indicates a closed circuit (Fig. 501).
(2)
Set landing gear lever to OFF. Check that ohmmeter indicates a closed circuit.
(3)
Slowly move landing gear lever from OFF detent position toward UP position. Check that ohmmeter indicates switch actuation on or before 12 degrees of lever travel as lever moves from OFF position.
(4)
With landing gear lever in UP position, slowly move lever toward OFF position. Check that ohmmeter indicates switch deactuation before lever is 4 degrees from OFF position.
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