C. References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 32-00-30/201, Landing Gear Door Locks
(4)
AIPC 32-41-32 Fig. 1
D. Access
(1) Location Zone
138 Body Landing Gear Well - Right (hydraulic pressure surge accumulator for the body gear brakes)
571 Rear Spar to Landing Gear Support Beam, Left (hydraulic pressure surge accumulator for the left wing gear brakes)
671 Rear Spar to Landing Gear Support Beam, Right (hydraulic pressure surge accumulator for the right wing gear brakes)
E. Prepare for the Servicing
S 863-001
(1)
Make sure the landing gear ground locks are installed (AMM 09-11-00/201).
(2)
Make sure the wheel chocks are installed.
S 863-002
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 863-003
(3) If necessary, release the parking brake.
S 493-011
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(4)
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
S 493-009
(5)
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
S 843-005
(6)
If necessary, remove the power from hydraulic system 4
(AMM 29-11-00/201).
S 863-010
(7)
Make sure that the brakes are not operated manually.
F. Procedure (Fig. 301)
S 213-009
(1) 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.
(e)
If the accumulator charge pressure is correct, put the airplane back to its usual condition. If accumulator charge pressure is incorrect, charge the accumulator.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SEE
SEE
ASSEMBLY FWD SEE
C
HYDRAULIC PRESSURE SURGE ACCUMULATOR INSTALLATION (WING GEAR BRAKES)
____ LEFT SIDE INSTALLATION
NOTE: SHOWN, RIGHT SIDE
A
INSTALLATION EQUIVALENT.
Hydraulic Pressure Surge Accumulator Servicing Figure 301 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
HYDRAULIC PRESSURE
MANIFOLD
SURGE ACCUMULATOR
ASSEMBLY
(RIGHT BODY GEAR WHEEL
SEE C WELL, STA 1465)
DIRECT READING HYDRAULIC BRAKEPRESSURE GAGE ACCUMULATOR (REF)
CHARGING
INSTRUCTIONS
MARKER
SEE D
FWD
HYDRAULIC PRESSURE SURGE ACCUMULATOR INSTALLATION (BODY GEAR BRAKES)
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