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UF94200
EFFECTIVITY Page 331
ALL
MAIN LANDING GEAR SHOCK ABSORBER SERVICING
NITROGEN FILLING OF THE MLG TWO-STAGE SHOCK ABSORBER
(cont’d)
To do that:
- open the top charging valve,
- the nitrogen supply being open, slowly open
the control valve to add nitrogen; as soon as
the shock absorber moves, close the control
valve,
- after 5 minutes, measure the temperature,
T = 11ºC (52ºF), and the pressure at the top
charging valve, PA = 92 bar (1330 psi),
- using DIAGRAM 2, find the dimension HA required
for these conditions, HA = 140 mm (5.5 in),
- slowly open the control valve to add nitrogen
to obtain the same dimension H as we found
before, H = HA ± 1mm (0.6 in).
After 5 minutes, open the top and the bottom charging
valves.
Read and write down:
- pressures, PA = 92 bar (1330 psi),
PB = 112 bar (1620 psi),
- the temperature, T = 11ºC (52ºF),
- the dimension H, H = 139 mm (5.5 in).
Using the pressure and the temperature find the correct
dimension H in DIAGRAM 2 and make sure that this value
is equal to the previous measured value, ± 1mm (0.6
in).
Make sure that the difference in pressure at the top
charging valve and the bottom charging valve is still
more than 10.7 bar (155 psi), PB > PA + 10.7 bar.
Close the top and the bottom charging valves.
Now, depending on if the pressure and temperature of
the top charging valve is either, on or below, or above
the graph line on DIAGRAM 3 (3), there are two
possibilities.
In our case, as PA is above the graph line, we have
to carry out the following steps:
- using DIAGRAM 1, find the dimension HA for the
pressure at the top charging valve and the
measured temperature, HA = 119 mm (4.7 in) (4),
- open the bottom charging valve,
- slowly open the control valve to remove
nitrogen and immediately the dimension H starts
to change, close the control valve,
- after 5 minutes, open the top charging valve,
and read and record the pressure, PA = 86 bar
(1250 psi), and the temperature, T = 11ºC
(52ºF),
- using DIAGRAM 1, find the dimension H that you
need for the above conditions, HA = 125 mm (4.9
in) (5),
- slowly open the control valve to remove
nitrogen from the bottom charging valve until
the dimension H is the same as the dimension
H found in DIAGRAM 1, ± 1 mm (0.6 in),
- close the bottom charging valve.
After 5 minutes, check the pressures:
- open the top charging valve, read and write
down the pressure, PA = 86 bar (1250 psi), and
then close it,
- open the bottom charging valve, read and
write down the pressure, PB = 85 bar (1230
psi), and then close it.
TMULDGA06-T06 LEVEL 3
EFFECTIVITY 32-00-00 Page 14
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 332
ALL
MAIN LANDING GEAR SHOCK ABSORBER SERVICING
NITROGEN FILLING OF THE MLG TWO-STAGE SHOCK ABSORBER
(cont’d)
Make sure that the pressure at the top and bottom
charging valves are the same, ± 1.5 bar (22 psi). If
not, you have to do the procedure again starting from
the step where the floating piston must be moved to
the top of the bottom chamber.
CLOSE-UP
Release the nitrogen pressure.
On the bottom charging valve:
- torque the valve to the preset value,
- remove the charging equipment,
- use SPECIAL MATERIALS to do a leak check of
the valve,
- install the blanking cap.
Remove the thermometer.
On the top charging valve:
- do the same as on the bottom charging valve.
Remove the access platform.
Examine the gland seal of the shock absorber for signs
of oil leaks.
Remove the ground support and maintenance equipment,
the special and standard tools and all other items.
Remove the warning equipment and notices.
Make sure that the work area is clean and clear of
tools and other items.
TMULDGA06-T06 LEVEL 3
EFFECTIVITY 32-00-00 Page 15
Sep 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 333
ALL
MAIN LANDING GEAR SHOCK ABSORBER SERVICING
PRESSURE/EXTENSION GRAPH - VALUES OF THE FILM
Find below the points noticed during the film in their
chronological order.
DIAGRAM 1
(1) PA = 79 bar (1150 psi), T = 10ºC (50ºF)
HA = 141 mm (5.6 in)
(4) PA = 92 bar (1330 psi), T = 11ºC (52ºF)
HA = 119 mm (4.7 in)
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