F. Procedure (Fig. 301)
S 843-006
(1) Do these steps to remove the hydraulic fluid from the accumulator:
(a)
Look at the pressure indication of the HYD BRAKE PRESS gage on the Captain's Main Instrument Panel, P1.
(b)
Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Repeat this cycle 10 times. 1) Make sure the pressure indication of the HYD BRAKE PRESS
gage decreases during manual brake operation.
2) After the 10 cycles of manual brake operation, make sure the HYD BRAKE PRESS gage shows no more decrease in pressure.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
HYDRAULIC BRAKE ACCUMULATOR CHARGING EQUIPMENT INSTALLATION HYDRAULIC BRAKE ACCUMULATOR
SEE A MARKER CHARGING INSTRUCTIONS
SEE C
GAGE PRESSURE READING DIRECT BSEE MANIFOLD ASSEMBLY
CHARGING EQUIPMENT INSTALLATION HYDRAULIC BRAKE ACCUMULATOR
A
CAP CHARGING INSTRUCTIONS-HYDRAULIC ACCUMULATOR.
MANIFOLD 900 WITH SYSTEM DEPRESSURIZED, CHARGE WITH DRY NITROGEN TO APPLICABLE PRESSURE PER CHART BELOW |50 PSI
800
700
PRESSURE-PSI GAGE
GAS CHARGING
VALVE 600 500 .0
MANIFOLD
-50 -25 +25 +50 +75
ASSEMBLY AMBIENT TEMP- `CENTIGRADE
B CHARGING INSTRUCTIONS MARKER
C
Figure 301 Hydraulic Brake Accumulator Servicing
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 213-009
(2) Do these steps to do a check of the accumulator charge pressure:
(a)
Look at the charging instructions marker adjacent to the accmulator.
(b)
With a value for the ambient temperature of the airplane, find the correct charge pressure for the accumulator.
(c)
Look at the pressure indication on the direct reading pressure gage adjacent to the mainfold assembly.
(d)
Compare the indication of the direct reading pressure gage with the correct charge pressure shown on the charging instructions marker.
S 613-025
(3) If necessary, service the Hydraulic Brake Accumulator.
TASK 12-15-09-603-026
3. Service the Hydraulic Brake Accumulator
_______________________________________
A. General
(1)
This task contains a procedure to increase the precharge pressure of the Hydraulic Brake Accumulator.
(2)
In subsequent steps, the hydraulic brake accumulator is referred to as the accumulator.
B. Consumable Materials
(1)
G01158 Nitrogen
(2)
If nitrogen is not available,
Source of Clean Dry Air, maximum moisture
content corresponding to an atmospheric dew
point of -20 degrees F (-29 degrees C)
C. References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
(4)
AMM 32-00-30/201, Landing Gear Door Locks
D. Access
(1) Location Zone
138 Body Landing Gear Well - Right
E. Procedure
S 613-010
(1) If necessary, do these steps to increase the charge pressure of the accumulator:
(a)
Remove the cap from the stem of the gas charging valve.
(b)
Attach a source of nitrogen or dry air to the stem of the gas charging valve.
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