TM 1-1520-238-23
1-222
1.66.
HELICOPTER JACKING (TRIPOD JACKS AT THREE POINTS) – continued
e. Remove wheel chocks (13).
f. Position one person to watch plumb bob (para
G.1) and direct jack operators during jacking.
NOTE
When plumb bob is not available use the
protractor method (para 1.133).
g. Raise helicopter slowly and evenly.
(1) Raise jack (4) and (8) until tires (14) and (15)
clear ground.
(2) Turn two lockrings (16) and (17) clockwise to
maintain contact with shoulders of jacks (4)
and (8).
h. Perform maintenance task.
i. Position one person to watch plumb bob (para
G.1) and direct jack operators during lower-
ing.
j. Lower helicopter slowly and evenly.
(1) Raise jacks (4) and (8) until lockrings (16)
and (17) turn freely.
(2) Slowly release pressure. Turn pressure valve
screws (5) and (10) counterclockwise. Use
jack handles (6) and (11).
(3) Slowly turn lockrings (16) and (17) counter-
clockwise as rams (7) and (12) lower.
k. Install wheel chocks (13).
l. Set parking brake (para 1.61).
m. Remove jacks (4) and (8).
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