T1: Shock Strut Leakage Fault Tree Analyses

E2: Internal factors

OR GATE

E6: Seal failures

E1: External factors

E8: Risk of seal failure due to seal contamination ✅

OR GATE

E4: structural friction damage

E3: Bad weather conditions

OR GATE

E5: Abnormal landing

OR GATE

B5-2:Risk of exceeding maximum landing weight ✅

OR GATE

B4-1 Risk of deviation in oil's viscosity ✅

B5-1: Risk of exceeding vertical acceleration ✅

E7: air valve assembly

E5: Wear-out failures

B8-2 Risk of wear-out failure due to seals wearing-out ✅

B8-3 Risk of wear-out failure due to internal parts wearing-out ✅

B8-1 Risk of wear-out failure due to oil wearing-out ✅

B7-2: Risk of seal failure due to perished seals ✅

B7-4: Risk of seal failure due to seals extrusion ✅

B7-1 Risk of seal assembly failure due to improper installation ✅

HM design for shock absorber

FMAE

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Gaussian Random Residual

Snapshot failure

AND GATE

B7-3: Risk of seal failure due to packing gland scraper contamination ✅

B7-3: Risk of seal failure due to sealing contamination ✅

B7-1: Risk of material fault due to defects in the high pressure valve core ✅