TM 55-1520-240-23-1
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SERVICE FORWARD LANDING GEAR SHOCK STRUT (AIR) (Continued)
1-71
NOTE
Service both struts in same way and
at same time. Right strut is shown
here.
DEFLATE STRUT
WARNING
High pressure air trapped under valve
cap can be a hazard. If cap is not
removed slowly, air can pop it off and
cause injury.
NOTE
Steps 1 thru 3 are done on left and
right struts at same time. One repairer
works on each strut.
1.
Loosen cap (1) slowly. Remove it from valve (2).
2.
Hold body of valve (2) with wrench. Turn outer
valve nut (3) to left one or two turns to release
air.
NOTE
If hydraulic fluid is found in air
chamber, replace the strut.
3.
Rock helicopter from side to side as air is
released. This makes sure strut is deflated.
4.
Turn nut (3) fully to right to close valve (2).
INFLATE STRUT
5.
Connect chuck (4) from air source to valve of
one strut.
6.
Open valve by turning outer valve nut (3) to left.
7.
Add air until 1/2 inch of shiny surface shows on
strut (5). Record air pressure required.
8.
Shut off air by turning outer valve nut (3) to right.
Disconnect chuck (4).
9.
Repeat steps 5 thru 8 for other forward gear.
10.
Deflate first strut (steps 1 and 2).
11.
Inflate first strut again to 1/2 inch. (Repeat steps
5 thru 8; then go to step 12.)
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