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Print Date: Sat Mar 28 11:52:40 CST 2015 MODEL 172 MAINTENANCE
MANUAL (Rev 20
7-10-00 (Rev 8)
2015 Cessna Aircraft CompanyRetain printed data for historical
reference only. For future maintenance, use only current data. Page
1
JACKING- MAINTENANCE PRACTICES
1. General
CAUTION: JACKING BOTH WHEELS SIMULTANEOUSLY AT BUILT-IN JACKPADS
IS NOT RECOMMENDED. WHEN USING BUILT-IN JACK PAD,FLEXIBILITY OF THE
MAIN GEAR STRUT WILL CAUSE THE MAINWHEEL TO SLIDE INBOARD AS THE
WHEEL IS RAISED, TILTINGTHE JACK. IF THIS OCCURS, THE JACK MUST BE
LOWERED FOR ASECOND OPERATION.
A. Normal jacking procedures involve lifting one main wheel at a
time. This procedure is bestaccomplished using a floor jack in
conjunction with the built-in jack pad (located directly below
thestep on each strut).
2. Tools, Equipment and Materials
A. For a list of required tools, equipment and materials, refer
to Lifting and Shoring - General.
3. Jacking Procedure
NOTE: When the airplane needs to be raised off the ground at all
points, the following procedure should
be used.A. Raise Airplane (Refer to Figure 201).
CAUTION: WHEN PLACED ON JACKS, THE AIRPLANE IS NOSE HEAVY.TAIL
STANDS MUST WEIGH ENOUGH TO KEEP THE TAIL DOWNUNDER ALL CONDITIONS.
ADDITIONALLY, THE TAIL STANDMUST BE STRONG ENOUGH TO SUPPORT ANY
WEIGHT WHICHMIGHT BE TRANSFERRED TO THE TAILCONE AREA
DURINGMAINTENANCE, CREATING A TAIL HEAVY CONDITION.
(1) Carefully attach tail stand to tail tie-down ring.
(2) Place wing jacks and padded blocks under front spar, just
outboard of wing strut (Wing Station118.00). Ensure that padded
block (1 inch X 4 inch X 4 inch with 0.25 inch rubber pad)
isresting securely between spar and jack.
(3) Raise wing jacks evenly until desired height is reached.
B. Lower Airplane (Refer to Figure 201).(1) Slowly lower wing
jacks simultaneously until main tires are resting on ground.
(2) Remove wing jacks and pads from wing area.
(3) Detach tail stand from tie-down ring.
