(g)
Make sure that all the brake assemblies stay released.
S 725-040
(3)
Do a test on the system A operation:
(a)
With the pressure removed from system B, pressurize system A to 3000 +150/-200 psi (AMM 29-15-00/201).
(b)
Apply a 25 +/- 2 pounds force to the top of the left brake pedal of the Captain (or First Officer). 1) Write the brake pressure that is shown.
(c)
Apply a 25 +/- 2 pounds force to the top of the right brake pedal of the Captain (or First Officer). 1) Make sure the indicated brake pressure is +/- 125 psi of
the brake pressure you wrote down for the left brake pedal.
(d)
If the brake pressure you got for the brake pedals is not +/- 125 psi of each other, do the steps that follow: 1) Do a final adjustment for the roller/plunger gap of the
alternate system metering valve. a) Use the procedure (Adjust Metering Valve Rollers) to adjust one of the alternate system rollers.
NOTE: When you increase the gap, the brake pressure
____ reduces. When you decrease the gap the brake increases.
It could be necessary to adjust the gap out of the initial adjustment range shown in Fig. 502. If this is the case, use 0.023 to 0.060 inch as the final range for the roller/plunger gap of the alternate system metering valve.
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A
737-300/400/500MAINTENANCE MANUAL
b) Do a test on the system A operation again.
(e)
Fully push the brake pedals of the captain against the stops. 1) Make sure that the brake gage pressure is 3000 +150/-200 psi.
2) Make sure that the brake gage pressure and the system A gage pressure of the flight compartment are in |100 psi of each other.
(f)
Release captain brake pedals of the captain.
1) Make sure that the brake pressure is less than 60 psi after you release the brake pedals.
(g)
Fully push the brake pedals of the first officer against the stops. 1) Make sure that the brake gage pressure shows
3000 +150/-200 psi.
2) Make sure that the brake gage pressure and A system gage pressure of the flight compartment are in |100 psi of each other.
(h) Release the brake pedals of the first officer.
1) Make sure that the brake pressure is less than 60 psi after you release the brake pedals.
S 725-041
(4)
Put the landing gear control lever in the OFF position.
S 215-042
(5)
Make sure that the brake stacks release.
(6)
Put the landing gear control lever in the DN position.
(7)
Make sure that the brake stacks stay released.
S 845-043
S 215-044
TASK 32-41-00-705-054
4. Accumulator Operation Test__________________________
A. References
(1) AMM 29-15-00/201, Hydraulic Systems
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B.
C.
D.
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737-300/400/500MAINTENANCE MANUAL
Access
(1) Location Zone 101 Control - Cabin - Left 102 Control Cabin - Right 216 Left Main Wheel Well 217 Right Main Wheel Well 310 Left Main Landing Gear 410 Right Main Landing Gear
Do a Precharge Check of the Brake Accumulator
S 845-073
(1)
Put chocks in their position on the wheels and release the parking brake.
S 845-074
(2)
Remove the pressures from hydraulic systems A and B (AMM 29-15-00/201).
S 845-075
(3)
To remove the pressure in the accumulator, operate the brakes until the brake pressure gage shows no pressure decrease with additional brake operations.
S 215-076
(4)
Allow approximately 10 minutes for the accumulator hydraulic pressure to become stabilized.
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