TH2500MLR

Zinc anode condition assessment: Replace MIL-Spec zinc anodes with cadmium content when anode size drops to 10% or less of original dimensions

Tunnel submergence verification: Confirm tunnel top is submerged minimum 1 tunnel diameter below minimum light draft waterline to prevent vortexing and air entrainment

Propeller inspection and debris removal: Check fixed-pitch propeller for wear, cavitation damage, and clear debris from tunnel entrance and propeller surfaces

Ceramic tunnel coating inspection: Examine ceramic coating for erosion damage caused by sand and silt in operating waters

Hydraulic system and fluid condition: Monitor hydraulic fluid condition, pressure system integrity, and filtration (no separate grease points or oil levels to check due to integrated hydraulic lubrication)

Cavitation and noise assessment during operation: Monitor for abnormal cavitation indicators, excessive noise, vibration or shock loads that indicate air ingestion

Welded tunnel extension integrity: Check welds and seal areas if tunnel was extended through hull modification; avoid sand-blasting propeller shaft seal area

Inlet grid alignment (if equipped): Verify inlet grid alignment is parallel to predominant water flow direction to minimize pressure drop and debris accumulation