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k.   Allow conditions to stabilize
d.   Avtivate Power Assruance Test Switch

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-27 L.    714A  POWER   ASSURANCE   TEST   (PAT)   BASE- LINE AND TRIGGER VALUE. NOTE Recalculating the trigger value is not required un- less the PAC was performed for an engine major repair or change or replacement of the HMA or DECU. The PAT Baseline shall be used in con- junction with the Power Accurance Check, Maxi- mum   Continuous   Power   or   Maximum   Power (MCP or MP) to determine the PAT pass/fail trigger value. Perform the PAT Baseline check as soon as possible after the PAC. NOTE The  Power  Assurance  Test  (PAT)  Baseline  and Trigger  Value  check  may  be  performed  on  the ground, at a hover, or in flight. CAUTION Performance of the in-flight Power Assurance Test (PAT) Baseline and Trigger Value check is restricted to temperatures of -40_C to + 54_C, Pressure Altitude of Sea Level to 14,000 feet, airspeed of 80 KIAS to 100 KIAS and torque be- tween 60% and 70%. The in-flight check may be performed only in extreme environmental conditions, such as sand, dust or snow. 1-37. 1.  Power   Assurance   Test   (PAT)   Baseline   and Trigger Value. a.   On the ground with aircraft facing into the wind, at a hover, or in flight, verify the NR at 100%. b.   Adjust  ECL  as  required  to  attain  60-70% torque on engine being checked.







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