(5) Follow the jack system manufacturer's instructions on the jack placard, to lift the jack.
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747-400
MAINTENANCE MANUAL
MAIN GEAR
Jack Airplane Axles In Windy Conditions
Figure 202 (Sheet 1)
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747-400
MAINTENANCE MANUAL
LIMIT
300,000 400,000 500,000 600,000 700,000 800,000 (136,050) (181,400) (226,750) (272,100) (317,450) (362,800)
GROSS WEIGHT IN POUNDS (IN KG)
DECREASE BY 1/3 FOR OPERATIONS NEAR BUILDINGS OR LARGE AIRCRAFT. FOR GUSTY CONDITIONS, USE GUST VELOCITY.
HEAD OR TAIL WIND: DRY, WET, OR ICY CONDITIONS
CROSSWIND: DRY, WET, OR ICY CONDITIONS
CAUTION: ABOVE 30 KNOTS, DIMENSION "A" ON STRUT SERVICING CHART (LOCATED IN NOSE WHEEL WELL) MUST NOT BE MORE THAN 5.0 INCHES. DEFLATE IF NECESSARY (REF 12-15-05/201) AND REINFLATE AFTER YOU LIFT THE AIRPLANE ON JACKS.
NOSE GEAR
Jack Airplane Axles In Windy Conditions
Figure 202 (Sheet 2)
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747-400 MAINTENANCE MANUAL
H. Lift the Main Landing Gear Axles (Unusual Conditions - One or More Flat Tires)
S 612-008
WARNING: ALWAYS USE A PRESSURE REGULATOR ON A HIGH PRESSURE AIR SOURCE
_______ WHEN YOU INFLATE DAMAGED TIRES. BE CAREFUL NOT TO INFLATE THE TIRES MORE THAN THE STRUCTURAL LIMITS.
CAUTION: IF THERE IS MULTIPLE TIRE FAILURE ON MORE THAN ONE MAIN GEAR ON
_______ THE SAME SIDE OF THE AIRPLANE, LIFT THE AXLES AT THE TWO GEARS AT THE SAME TIME, AND KEEP EVEN JACK LOADS. IF EQUIPMENT IS NOT AVAILABLE OR YOU CAN LIFT THE AXLES AT ONE GEAR ONLY, ALWAYS LIFT THE WING (OUTBOARD) GEAR AXLES AND FIX THE TIRES BEFORE BEFORE YOU LIFT THE BODY (INBOARD) GEAR AXLES, TO MINIMIZE THE POSSIBILITY OF STRUT OVERLOAD.
(1)
Inflate the tire(s) to the necessary pressure (Ref 12-15-06/301).
S 582-009
(2)
Lift the axle if you can inflate one tire to a sufficient height to put the axle jack in the correct position.
(a) Put the jack directly below the jack pad of the applicable gear truck.
NOTE: If one tire is flat on each axle of a gear, it is
____ recommended that you use a jack below each axle. If only one jack is available, use cribbing below one axle while you lift the other axle. This is to prevent too much load on the tire on the axle that you will not lift, and will decrease the risk of tire failure. If two tires on one axle and one tire on other axle of a gear are flat, always replace the tire on the axle with one flat tire before you replace the tires on the other axle. Limits to lift the airplane in windy conditions are found on Fig. 202.
CAUTION: YOU MUST LIFT THE AIRPLANE WITH THE SHOCK STRUT INFLATED.
_______
(b)
Make sure the shock struts are inflated.
(c)
Install the wheel chocks at the inflated tires of the truck that is not being lifted with the jack.
NOTE: Make sure you have a set of wheel chocks at a set of
____ landing gear tires on the right side and the left side of the airplane. If both trucks on one side of the airplane are lifted with axle jacks, put wheel chocks at the nose gear tires.
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