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A Maximum Continuous Power Check
M.  712    INTERSTAGE  AIR-BLEED  SPEED  ADJUSTMENT

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-30 Following the Maximum Continuous Power Check/Maxi- mum Power Check, a Baseline Power Assurance Test was performed at a FAT of +14_C. The PATN values were; ENG #1, 26 ENG #2, 28 The PATN adjustment for a FAT of +14_ is -1 (minus 1). The ADJUSTED PATN is ENG #1, 25 ENG #2, 27 The TEMP MARGIN VALUE determined during PAC is: Engine #1 Engine #2 806 899 -775 -872 31 27 Dividing the TEMP MARGIN VALUE by 5 and rounding the results off to the nearest whole number determine PACN Margins for Engine #1 and #2 as 6.2 and 5.4 rounded is 6 and 5. NOTE If the value if the PACN is not a whole number, round the number right of the decimal point to the nearest whole number. If .4 or less round DOWN, if .5 or greater, round UP. Subtracting   PACN   Margins   from   the   Adjusted PATN obtains each engine’s PAT Trigger Values as #1 engine 19 and #2 engine 22. Enter these val- ues as the PAT Trigger Value on the PAT LOG. Also enter all pertinent data in the aircraft historical DA Forms 2408-19-1 I/A/W DA PAM 738-751







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