MS14168A(AS)
NUMBER OF |
TEST DESCRIPTION |
||
SEQUENCE 1 |
CYCLES 45 |
TEST I |
OPERATION CATAPULT CONDITION |
2 |
1 |
J |
BRUISE TEST |
3 |
25 |
A |
TAXI - TAKEOFF |
Test tire 3 shall complete repeated cycles of test I until the tire shows evidence of failure or visible deterioration beyond normal tread wear. The tire shall complete not less than 45 successful cycles before failure. The results of this test are for information only with the number of cycles to failure noted in the qualification test report.
Test tire 4 shall be inflated to 400 psi and loaded against a non-deflecting flat plate to a vertical load of 61,300 pounds at a camber of not less than 5.8 degrees. The tire shall remain fully inflated and intact. The loaded radius shall be measured and recorded during the vertical camber loading procedure. This data may be used to prepare the load-deflection curve for the tire.
Test tire 5 shall withstand test K. The minimum burst pressure shall be 1400 psi.
TEST A Taxi - takeoff. The tire shall be taxied on the flywheel at 30 miles per hour (mph) for 10,000 feet with 6,500 pounds load. Immediately following the taxi roll, the flywheel shall be accelerated at an average rate of 7.87 feet/sec/sec from 0 mph to a speed of 145 mph. The tire shall be unlanded after a takeoff roll distance of
2,920 feet has been covered. The initial takeoff load of 6,500 pounds shall be decreased linearly with time to 3,000 pounds at 26 seconds after the start of the takeoff roll and decreased to zero pounds at the end of the takeoff roll.
TEST B Taxi - high speed takeoff. The tire shall be taxied on the flywheel at 30 mph for
10,000 feet with 6,500 pounds load. Immediately following the taxi roll, the tire shall be loaded and its speed increased linearly as follows:
TIME (SEC) |
LOAD (LB) |
SPEED (MPH) |
DISTANCE (FT) |
0 |
7000 |
0 |
0 |
13.6 |
6200 |
132 |
1319 |
14.1 |
5200 |
137 |
1418 |
26.6 |
900 |
223 |
4718 |
26.8 |
0 |
224 |
4784 |
TEST C Landing - taxi. The tire shall be landed against a flywheel rotating at a
peripheral speed of 156 mph. The flywheel speed shall then be decreased until a roll distance of approximately 4030 feet has been covered. The average deceleration rate shall be 3.52 feet/sec/sec between 156 and 132 mph, and
3
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