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Figure  2-12-2.  Auxiliary Power Unit
2-13-4.  FORM Light Switches

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM  1-1520-240-10            2-13-1 SECTION  XIII.  LIGHTING 2-13-1.  Position Lights. Three position lights (1, 4, and 6, fig. 2-13-1) are installed on the helicopter. On the right side of the fuselage is a green light (1); on the left, red (6); and on the vertical panel of the aft pylon, white (4). Power to operate the position lights is supplied by the No. 2 DC bus through the LIGHTING POS circuit breaker on the No. 2 PDP. 2-13-2.  Position Light Switches. a. POSN    Light    Switch.  The    POSN    (position) switches located on the EXT LTG (exterior lighting) panel on the left side of the overhead switch panel (fig. 2-1-10). The three position switch is labeled DIM, OFF, and BRT. It adjusts the intensity of the position lights. When the switch is OFF, the position light system is deenergized. NOTE The crew chief must inform the pilot when the AFT POS LIGHT switch has been changed to the OFF position. b. AFT POS LIGHT Switch.  The AFT POS LIGHT switch is located in the cabin at sta. 534 near the MAIN- TENANCE PANEL (fig. 2-13-4). The guarded two-posi- tion switch is labeled OFF and ON. It allows the aft posi- tion light to be turned off during aided (NVG) operations and on during unaided night operations. 2-13-3.  Formation Lights. There  are  five  electroluminescent  panels  for  normal night formation operations (2 and 5, fig. 2-13-1) and eight NVG compatible formation lights for NVG formation op- erations (9, fig. 2-13-1) Figure  2-13-1.  Exterior Lights







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