MS14171C(AS)
Dimensions: All tires shall be inflated to rated inflation pressure and measured for dimensional compliance. Tires shall then be allowed to stand 12 hours minimum at room temperature after which the pressure loss due to growth shall be replaced and the tire measured for dimensional compliance. Tire dimensions at 350 psi shall then be measured for grown compliance. In addition, each of the tires used for dynamic testing shall be measured during testing for grown and thrown compliance (see figure 2)
TIRES 1 & 2: Tires 1 and 2 shall be inflated to 245 psi, corrected for flywheel diameter. Each tire shall complete sequence 1 through 7 as defined below for a total of 51 simulated land based missions. One tire shall be subjected to the high speed takeoff (test G) and the other tire shall be subjected to the single engine takeoff (test I). Five of the 51 missions shall be with 0.25g aircraft turns (tests B1, D1) and the remainder shall be with 0.10g turns (tests B2, D2). The high speed, aborted, and single engine takeoff mission taxi-outs and taxi-ins may be with
0.10g turns.
NUMBER OF |
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SEQUENCE |
CYCLES |
TEST |
TEST DESCRIPTIONOPERATION |
1 |
48 |
A - F |
TAXI OUT - NORMAL TAKEOFF |
2 |
1 |
E - F |
EXTENDED TAXI - NORMAL |
TAKEOFF |
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3 |
1 |
A - G |
TAXI OUT - HIGH SPEED |
(or A - I) |
TAKEOFF |
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(OR SINGLE ENGINE TAKEOFF) |
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4 |
50 |
H - C |
LANDING - TAXI IN |
5 |
51 |
B1 or B2 |
TAXI OUT TURN |
6 |
51 |
D1 or D2 |
TAXI IN TURN |
7 |
1 |
A - J -A |
TAXI OUT - ABORTED TAKEOFF |
STOP - TAXI OUT |
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The tire shall show no evidence of slippage that would damage the air seal between the tire and rim.
TIRE 3: Tire 3 shall withstand test K, then 5 cycles of test L, one cycle of test H, one cycle of test C, then for information test M. Inflation pressure, corrected for flywheel diameter, shall be 280 psi (20 percent under-inflated carrier pressure) for test K,
and 350 psi for test L, test H, and test C.
TIRE 4: Tire 4 shall be inflated to 245 psi, corrected for flywheel diameter, and subjected to the yawed landing condition on figure 2 . The test shall be run within the limitations of existing test equipment. The vertical load shall be varied to obtain the side load time history defined. The tire shall subsequently complete one sequence of test A, test B2, test F, test H, test C, and test D2.
2
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