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of the shock absorber for leakage of hydraulic fluid.
In case of leakage, refer to your AMM to troubleshoot.
PROCEDURE
Measure and record dimension H, H = 89 mm (3.50 in).
Measure and record the temperature of the MLG adjacent
to the top charging valve, T = 10ºC (50ºF).
Put the standard charging equipment into position.
On the top charging valve:
- remove the blanking cap,
- on the charging equipment, make sure that the
control valves are closed,
- and connect the filling hose.
Do the same on the bottom charging valve.
CAUTION: MAKE SURE THAT YOU USE A GAGE WITH THE
SPECIFIED PRESSURE RANGE.
On the top charging valve:
- slowly open it,
- read and record the pressure shown on the
pressure gage, PA = 79 bar (1150 psi),
- and then close it.
Do the same on the bottom charging valve, PB = 75 bar
(1090 psi).
Using DIAGRAM 1, find the dimension HA for the pressure
at the top charging valve and the measured temperature,
HA = 141mm (5.6 in) (1).
As the condition H = HA ± 15mm (0.6 in) is not fulfilled
we have to do the Nitrogen Filling of the MLG Two-Stage
Shock Absorber.
The pressure at the bottom charging valve must be
between 13.8 and 20.7 bar (200 and 300 psi) above the
pressure at the top charging valve,
PA + 13.8 bar < PB < PA + 20.7 bar.
This is to ensure that the floating piston is at the
top of the bottom chamber (key point in case of
restart).
To perform this condition, we are going to pressurize
the bottom chamber.
WARNING: DO NOT PUT COMPRESSED GAS IN CONTACT WITH
YOUR SKIN. THE GAS CAN GO THROUGH THE SKIN
AND CAUSE BUBBLES IN THE BLOOD. THIS COULD
CAUSE DEATH.
MAKE SURE THAT THE AREA AROUND THE AIRCRAFT
IS CLEAR OF PERSONS AND EQUIPMENT. WHEN YOU
PRESSURIZE OR DEPRESSURIZE THE SHOCK
ABSORBER, WITH THE AIRCRAFT WEIGHT ON THE
GROUND, THE AIRCRAFT WILL MOVE.
TMULDGA06-T06 LEVEL 3
EFFECTIVITY 32-00-00 Page 12
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 330
ALL
MAIN LANDING GEAR SHOCK ABSORBER SERVICING
NITROGEN FILLING OF THE MLG TWO-STAGE SHOCK ABSORBER
(cont’d)
CAUTION: ALWAYS ADD NITROGEN SLOWLY WHEN YOU
PRESSURIZE THE SHOCK ABSORBER. IF YOU ADD
NITROGEN TOO QUICKLY, THE TEMPERATURE WILL
INCREASE AND HAVE AN EFFECT ON THE SHOCK
ABSORBER PRESSURE.
FILLING
On the bottom charging valve:
- the nitrogen supply being open, open the bottom
charging valve,
- open the control supply valve slowly to add
nitrogen to the bottom chamber, PB = 98 bar
(1420 psi),
- close the bottom charging valve.
Wait ten minutes and make sure that the pressure
condition is fulfilled. The bottom chamber pressure
is still the same, PB = 98 bar (1420 psi).
Check the pressure of the top chamber too:
- slowly open the top charging valve,
- read and record the pressure shown on the
pressure gage, PA = 92 bar (1330 psi),
- and then close it.
As the pressure condition is NOT fulfilled
(PA + 13.8 bar < PB < PA + 20.7 bar), we have to increase
the pressure in the bottom chamber by adding nitrogen.
On the bottom charging valve:
- the bottom charging valve being open, open the
control supply valve slowly to add nitrogen to
the bottom chamber, PB = 112 bar (1620 psi),
- and close the bottom charging valve.
Wait ten minutes and make sure that the pressure
condition between the two chambers is fulfilled,
PA = 92 bar (1330 psi), PB = 112 bar (1620 psi). The
pressure condition is fulfilled.
The nitrogen pressure being released, read and write
down the temperature again, T = 11ºC (52ºF), as well
as the dimension H, H = 123 mm (4.8 in).
Make sure that the difference in pressure at the top
charging valve and the bottom charging valve is more
than 10.7 bar (155 psi),
PB > PA + 10.7 bar,
this condition being enough at this point.
Using DIAGRAM 2, find the dimension HA for the pressure
and the temperature at the top charging valve,
HA = 140 mm (5.5 in) (2).
Dimension H must be the same as HA, ± 1mm (0.6 in).
Depending on whether H, is higher or lower than the
value of HA found on DIAGRAM 2, we have respectively
to remove or add nitrogen from the top chamber.
As H is lower than the value of H found on DIAGRAM 2
we have to add nitrogen to the top chamber.
TMULDGA06-T06 LEVEL 3
EFFECTIVITY 32-00-00 Page 13
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
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