TM 9-2350-277-20-2PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDINGLUBRICATION INSTRUCTIONS — Continued0155 00ITEMNO.INTERVALMAN-HOURITEM TO BECHECKED ORSERVICEDCREWMEMBERPROCEDUREEQUIPMENTNOT READY/AVAILABLEIF:NOTEExtremely high ambient temperature andhigh altitude will reduce stall speed.d. If the carrier is equipped with an X200-4transmission, tachometer readings above 2450means transmission problems and readingsbelow 2350 means engine problems.Troubleshoot suspect systems (WP 0024 00), orcheck for wrong tachometer adapter. If faultcannot be found, notify direct supportmaintenance.Reading above2450 rpm orbelow 2350rpm.e. If the carrier is equipped with an X200-4Atransmission, tachometer readings above 2300means transmission problems and readingsbelow 1900 means engine problems.Troubleshoot suspect systems (WP 0024 00), orcheck for wrong tachometer adapter. If faultcannot be found, notify direct support.Reading above2200 rpm orbelow 1900rpm.0155 00-38
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