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2-3-41.  Engine Air Particle Separator (EAPS)
Figure  2-3-9.  EAPS 1 Shown With Bypass Doors Open

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM  1-1520-240-10            2-3-17 EAPS control switch located in the EAPS control panel is in the OPEN position and the doors are fully open, and will extinguish when the switch is in the CLOSE position and the doors are fully closed. 2-3-44.  Differential Pressure Switch. Each separator is equipped with a differential pressure switch to determine the air passages of the EAPS unit are blocked. The switch senses the pressure difference be- tween the inside and outside of the curved panels of the EAPS unit. When a differential pressure is detected, the EAPS 1 FAIL or EAPS 2 FAIL caution lights illuminated. 2-3-45.  EAPS Switches. There are four, 2 position toggle switches located on the EAPS control panel (fig. 2-3-8) situated on the overhead switch panel. a. The ENG 1 and ENG 2 FAN ON/OFF switches operate the control circuit to provide AC power for the EAPS fans. The switches receive power from the No. 1 and  No.  2  28  volt  DC  buses  through  circuit  breakers marked EAPS 1 and EAPS 2 FAN CONT. b. The ENG 1 and ENG 2 DOORS CLOSE-OPEN switch electrically positions the by-pass doors, open pr closed. The switches receive power from the No. 1 and No. 2 28-volt DC buses through circuit breakers marked EAPS 1 and EAPS 2 BYPASS DOORS. Figure  2-3-8.  EAPS Control Panel 1. EAPS fan exhaust 2. EAPS rails and slides.







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