(4)
Inflate shock strut with dry air or nitrogen to conform to servicing chart (Fig. 202).
(5)
Close air valve at top of shock strut.
(6)
Install dust cap and lockwire air valve.
(7)
Return airplane to service and, after 5 to 10 landings do the following steps:
(a)
Check shock strut pressure and X dimension. If necessary, reinflate shock strut.
(b)
Reservice the shock strut with air or nitrogen (Fig. 202).
510
May 01/99 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 12-15-31 Page 203
NOTE: The wide tolerance "Operation Band" does not eliminate the requirement for two separate charging operations to the "Servicing Band".
3. Service Main Landing Gear Shock Strut - Procedure II (Strut dry after repair, or airplane on jacks)
A. General
(1) This procedure is used to service the shock strut after the shock strut has been drained and disassembled for repairs or for adding fluid while the airplane is supported on jacks.
B. Equipment and Materials
(1)
Low pressure servicing cart for MIL-H-5606, MIL-H-6083 hydraulic fluid or fully formulated shock strut fluid (Ref 20-30-21)
(2)
Hose to suit air charging valve
(3)
Suitable container to collect hydraulic fluid (approximately 5-gallon capacity)
(4)
Airplane jacks
(5)
Axle jack
(6)
Dry air or nitrogen bottle charged to 2500 psi minimum
(7)
Strut Inflation Tool - F70200-1
(8)
(Preferred) Fully formulated BMS3-32 Type I (with corrosion inhibitor) or Type II (without corrosion inhibitor). BMS3-32, Type I is used to fill a strut for the first time after being overhauled. Subsequent refills may be done with BMS3-32 Type I or Type II.
(9)
(Optional) As a substitute for BMS3-32, Type I, operators may mix the MIL-H-6083 with 2.4% by volume of Lubrizol 1395. As a substitute for BMS3-32, Type II, operators may mix MIL-H-5606 with 2.4% by volume of Lubrizol 1395.
NOTE: Avoid adding the Lubrizol directly. We recommend thoroughly pre-mixing the Lubrizol with 10 parts shock strut fluid before pouring the additive into the strut.
C. Service Main Landing Gear Shock Strut
(1)
Jack airplane until shock strut is fully extended (Ref Chapter 7, Jacking Airplane).
(2)
Completely deflate shock strut by removing dust cap from charging valve on top of shock strut and slowly opening air valve nut two turns maximum (Fig. 201).
WARNING: DO NOT REMOVE VALVE BODY. BODY CAN BLOW OUT CAUSING POSSIBLE INJURY TO PERSONNEL.
NOTE: Fluid under pressure in shock strut will start foaming immediately after pressure is reduced to ambient. Deflate shock strut slowly to prevent loss of fluid through air valve.
510
12-15-31 Page 204 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/99
501 Main Gear Shock Strut Servicing Chart
Nov 15/71 Figure 202 12-15-31
Page 205
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(3)
Place axle jack under shock strut and slowly raise inner cylinder until shock strut is fully compressed.
(4)
Remove foamed fluid and fill with fluid by either of the following methods:
(a) Flushing Method 1) Remove check valve sealing cap. 2) Connect servicing cart to drain tube check valve. 3) Connect an overflow hose to air valve on top of shock strut and check that air
valve is fully opened. Place other end of hose to drain into container. 4) Pump fluid from service cart into shock strut until approximately 3 gallons of fluid overflows into container to ensure all foamed fluid has been displaced.
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