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M.  712    INTERSTAGE  AIR-BLEED  SPEED  ADJUSTMENT
N.  AFCS CHECK

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-32 NOTE 1.  NO.   1   &   NO.   2   ENGINE   BEEP   TRIM   — DECREASE for 8 seconds. 2.  Note engine N1 readings. 3.  Use  the  appropriate  beep  system  (Normal  or Emergency  on  either  engine)  to  indicate  an engine N1 less than the minimum specified for the applicable ambient temperature as indicated on figure 5-6 on the engine to be checked. This procedure requires two-way communication between the pilot and the mechanic. The pilot will run the engine and note the N1 readings. The me- chanic  will  notify  the  pilot  when  the  bleed  band closes and adjust, if necessary. NOTE Bleed  band  must  be  open  under  this  operating condition. CAUTION Do not allow engine speed to go below mini- mum N1 speed during this check. 4.  Slowly  increase  appropriate  beep  trim  while maintaining rotor rpm within limits and determine N1 when bleed band has just closed. NOTE Closure may be determined by inserting a 0.010 inch feeler gage under the bleed band. 5.  The N1 at the bleed band closure point must be within the limits specified on the chart on figure 5-6.







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