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 S 203-043
 (5)  If the fluid level is not correct and you need to dispatch the airplane, perform a fast check (Ref "Shock Strut Sevicing Fast Check" task).
 (a)  If the struts pass the fast check, permit the airplane to dispatch.
 NOTE: Perform the strut servicing (Ref "Wing Landing Gear
____ Shock Strut Servicing" task) as soon as the equipments are available.
 (b)  If the struts do not pass the fast check, add air to or release air from the strut to get a point on the servicing band to permit dispatch for one flight to a facility where the full servicing will occur.
 NOTE: It is not necessary to dispatch the airplane for
____ servicing if the equipment are available at the site.
 S 613-044
 (6)  Do a full servicing (Ref. "Body Landing Gear Shock Strut Servicing" task) or do the steps that follow to add hydraulic fluid to the full level.
 CAUTION: REMOVE THE PRESSURE FIRST FROM THE WING LANDING GEAR OR
_______ REMOVE IT EQUALLY FROM ALL OF THE MAIN LANDING GEARS. THE AIRPLANE CAN FALL TO THE SIDE IF YOU REMOVE THE PRESSURE INCORRECTLY.
 CAUTION: BEFORE YOU DEFLATE THE STRUT MAKE SURE THAT THE AREA BELOW
_______ THE WINGS IS CLEAR. WHEN YOU DEFLATE THE STRUT THE WING CAN LOWER MANY FEET, WHICH CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (a)  
Remove the caps from the air valves.

 (b)  
Loosen the outer nut a maximum of two turns on each air valve.

 NOTE:____Permit the shock struts to compress fully. See Dimension "X" in Figure 301.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (c)  
Release the air fully from the shock struts through the air valves.

 (d)  
Let the gas/fluid mixture evaporate for one hour.

 (e)  
Connect one end of a hose to the air valve.

 (f)  
Put the other end of the hose in a drain bucket.

 (g)  
Remove the pressure cap from the oil fill valve.

 (h)  
Attach the hydraulic fluid line to the oil fill valve.

 (i)  
Make sure that the shutoff valve on the lower outer cylinder is open.

 NOTE: Use a 3/16-inch hex wrench to open the shutoff valve if
____
 it is necessary.

 (j)  Fill the strut with the specified hydraulic fluid on the nameplate.
 NOTE: If only small quantities of fluid are neccessary, you
____ can use fluid without lubricant to fill the shock strut. If large quantities are necessary, add lubricant to the shock strut. As an alternative, you can use a fluid which has an added lubricant.
 (k)  
Continue to fill the shock strut until the hydraulic fluid which flows into the bucket is free of bubbles.

 (l)  
Remove the oil servicing line.

 (m)  
Put the cap on the oil fill valve.

 (n)  
Remove the hydraulic hose from the air valve.

 (o)  
Connect the air hose from the service manifold assembly to the air valve.

 (p)  
Pressurize all the shock struts with nitrogen or dry air to approximately 13.00 inches.

 (q)  
Measure dimension X vertically from the bottom of the outer cylinder to the top of the axle housing.

 (r)  
Add or release air until the dimension X and the pressure are in the band on the servicing chart.

 (s)  
Close the air valve on the shock strut.

 (t)  
Remove the hose of the service manifold assembly from the air valve.

 (u)  
Tighten the swivel nut to 60-84 pound-inches.

 (v)  
Install the pressure caps on the air valves of each gear.

 S 613-048
 (7)  After 5-10 landings, measure dimension X and read the pressure on the pressure gages of the body landing gears. If the pressure and dimension X are out of range, add or release gas.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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