STANDBY HYDRAULIC SYSTEM RESERVOIR LOW LEVEL WARNING SWITCH -REMOVAL/INSTALLATION

1.  General

A.  The standby hydraulic system low level warning switch is mounted on top of the standby hydraulic reservoir located over the keel beam in the wheel well area.
B.  Should any fluid be spilled on the airplane, the affected area must be decontaminated  (Ref 12-40-04).
2.  Equipment and Materials

A.  Suitable container to catch hydraulic fluid (approx 4-gallon capacity)
B.  Quick-disconnect coupling half P/N 375530-12 with approx 18-inch hose
C.  Skydrol Assembly Lube - MCS 352 or Hydraulic Fluid - BMS 3-11 (20-30-21)
D.  Sealant - BMS 5-95 (Ref 20-30-11)
3.  Remove Standby Reservoir Low Level Warning Switch (Fig. 401)
A.  Open nine circuit breakers CONTROL CABIN LIGHTING MASTER DIM BUS IND (P6).
B.  Open CONTROL CABIN LIGHTING MASTER CAUTION ANNUNCIATION No. 1 and BATTERY circuit breakers (P6).
C.  Position FLT CONTROL B switch OFF.
D.  Depressurize system B hydraulic reservoir (Ref 29-09-300 MP).,
E.  Disconnect standby hydraulic pump supply line at bottom of standby reservoir.
F. Place open end of hose with quick-disconnect coupling half assembly in container and connect coupling to quick-disconnect at bottom of standby reservoir. Permit fluid to drain until all flow ceases.
G.  Remove electrical connector from low level warning reservoir.
H.  Remove switch from reservoir.
I.  Remove drain quick-disconnect coupling and hose.
4.  Install Standby Reservoir Low Level Warning Switch (Fig. 401).
A.  Provide electrical power (Ref 24-22-00 MP).
B.  Lubricate O-ring with assembly lube or hydraulic fluid and install on low level warning switch.
C.  Install switch in port on top of standby hydraulic reservoir and tighten.
D.  Apply a fillet of sealant around hexagonal nut of switch.
E.  Install electrical connector on switch.
F.  Close all circuit breakers CONTROL CABIN LIGHTING MASTER DIM BUS IND. (P6 panel).
G.  Close CONTROL CABIN LIGHTING MASTER CAUTION ANNUNCIATION BUS NO. 1 and BATTERY circuit breakers (P6 panel).
H.  Check that STBY HYD LOW QUANTITY (P5 panel) light is on.
I.  Fill standby and system B reservoirs (Ref 12-12-00).
J.  Check that light observed above is off.
500 
Feb 20/88  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-33-21 Page 401 

F87964
Standby Hydraulic System Low Level Warning Switch Installation  500 
29-33-21  Figure 401  Feb 20/88 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

K.  Connect standby pump supply line quick-disconnect to disconnect on bottom of standby reservoir.
CAUTION:  ENSURE THAT INDICATOR PINS ON QUICK DISCONNECT ARE FULLY EXTENDED OR RESTRICTED FLOW COULD DAMAGE PUMP.
L.  Close system B depressurization valve and pressurize system B reservoir (Ref 29-09-300).
M.  Check all connections for leaks.
N.  Check system B hydraulic quantity. Service if necessary (Ref 12-12-00).
O.  Remove electrical power if no longer required (Ref 24-22-00 MP).
500 
Feb 20/88  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-33-21 Page 403 

SYSTEM B HYDRAULIC SYSTEM RESERVOIR LOW LEVEL WARNING SWITCH -REMOVAL/INSTALLATION

1.  General

A.  The System B Hydraulic System Reservoir low level warning switch is mounted on top of the System B Hydraulic System Reservoir located on the forward bulkhead of the wheel well area.
B.  Should any fluid be spilled on the airplane, the affected area must be decontaminated (Ref 12-40-04).
2.  Equipment and Materials

A.  Suitable container to catch hydraulic fluid (approx 4-gallon capacity)
B.  Quick-disconnect coupling half P/N 375530-12 with approx 18-inch hose
C.  Skydrol Assembly Lube - MCS 352 or Hydraulic Fluid - BMS 3-11 (20-30-21)
D.  Sealant - BMS 5-95 (Ref 20-30-11)
3.  System B Hydraulic System Reservoir Low Level Warning Switch (Fig. 401)
A.  Open nine circuit breakers CONTROL CABIN LIGHTING MASTER DIM BUS IND (P6).
B.  Open CONTROL CABIN LIGHTING MASTER CAUTION ANNUNCIATION No. 1 and BATTERY circuit breakers (P6).
C.  Position FLT CONTROL B switch OFF.
D.  Depressurize system B hydraulic reservoir (Ref 29-09-300 MP).
E.  Open System B reservoir drain valve and drain fluid from reservoir.
F.  Remove electrical connector from low level warning reservoir.
　
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