H28293
Air Cycle Machine Lubrication 500
12-13-51 Figure 201 May 01/01
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
RAM AIR SYSTEM TURBOFAN -SERVICING
1. General
A. The procedure outlined in this section is for replenishing the turbofan oil sump. For draining and refilling of sump, refer to Chapter 21, Turbofan -Unit Servicing.
2. Equipment and Materials
A. Turbofan lubricant -Mobil Jet Oil II, MIL-L-23699
3. Service Ram Air System Turbofan
A. Open air conditioning equipment bay doors.
B. Replenish turbofan oil sump.
(1)
Check that oil level in turbofan has not dropped below ADD line on dipstick.
(2)
Remove dipstick and add oil to overflow holes in dipstick fitting.
(3)
Visually check for oil discoloration on dipstick.
(4)
If oil is discolored, drain sump (Ref Chapter 21).
(5)
Install dipstick.
(6)
Close air conditioning equipment bay doors.
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12-13-61 Page 201
WATER SYSTEM -SERVICING
1. General
WARNING: IF THE POTABLE WATER SYSTEM IS NOT DRAINED OR IN NORMAL SERVICE A MINIMUM OF ONE TIME EACH THREE DAYS, THE GROWTH OF BACTERIA CAN OCCUR. IF BACTERIA GROWTH CONTINUES AND YOU DRINK THE WATER, ILLNESS CAN OCCUR.
A. Opening the fill and overflow valve will prevent pneumatic system pressure from building up in the tank during the filling operation, but will not prevent pneumatic system pressure from causing excessive overflow once the tank is full.
2. Fill Water Tank
A. Connect water hose to fill connection and turn fill and overflow valve control handle to open (Fig. 201).
CAUTION: WATER PRESSURE GREATER THAN 35 PSI CAN CAUSE DAMAGE TO THE WATER TANK.
B. Pump drinkable water into tank. The recommended servicing water pressure is 25-30 psi.
C. As soon as water begins to flow from overflow port, turn off water at source.
D. Turn fill and overflow valve to CLOSED.
E. If use of water system is desired before normal pressurization is available, pressurize tank at air valve on service panel. Pressurize to 25 psi.
F. Close access doors.
NOTE: Fill valve handle must be in the closed position before the access door can be closed. A retainer prevents the fill valve handle from opening when the door is closed.
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12-14-0 Page 201
G11488
Passenger Water Service Panel 577
12-14-0 Figure 201 Feb 15/81
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
HYDRAULIC ACCUMULATOR - SERVICING
1. Brake Hydraulic Accumulator Servicing
A. Equipment and Materials
(1) Nitrogen charging truck
B. Service Brake Hydraulic Accumulator
(1)
Chock wheels and release parking brake.
(2)
Depressurize brake system by operating captain's or first officer's brake pedals approximately eight times.
(3)
Charge hydraulic accumulator with dry nitrogen according to instructions on aluminum foil marker near pressure gage in right main wheel well (Fig. 201).
WARNING: DO NOT LOOSEN VALVE BODY. INSIDE PRESSURES CAN BLOW VALVE OUT, CAUSING INJURY TO PERSONNEL. REMOVE VALVE CAP. ATTACH PRESSURE SOURCE, LOOSEN VALVE OUTER HEX-SWIVEL NUT ONE TURN, SERVICE TO SPECIFIED PRESSURE. TIGHTEN VALVE OUTER HEX-SWIVEL NUT. DISCONNECT SERVICE PRESSURE AND REPLACE VALVE CAP.
(4)
Pressurize applicable hydraulic system (Ref 29-11-0 and 29-12-0) system gage should read approximately 3000 psi.
(5)
Wait 5 minutes and depressurize hydraulic system (Ref 29-11-0 and 29-12-0). Brake pressure gage should read approximately 3000 psi.
(6)
Depress brake pedals approximately six times and recheck precharge on accumulator. Reservice if necessary.
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