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CHAPTER  5 OPERATING LIMITS AND RESTRICTIONS
Figure  5-2-1.  Instrument Markings (Sheet 1 of 5)

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM  1-1520-240-10            5-2-1 SECTION  II.  SYSTEM LIMITS 5-2-1.  Instrument Markings. 5-2-2.  Instrument Marking Color Codes. Operating  limitations  and  ranges  are  identified  by  the colored markings on the dials of engine, flight and utility drive train system instruments. The RED markings on the dials of these instruments indicate the limit above or be- low which continued operation is likely to cause damage or shortened life, white background may be utilized to highlight RED markings. The GREEN markings on in- struments  indicate  safe  or  normal  range  of  operation. The YELLOW markings on instruments indicate the time limited range or when special attention should be given to the operation covered by the instrument. Operation is permissible in the yellow range, but should be avoided. BLUE is a maximum indication associated with sustained operation of the related aircraft system for a prescribed period of time. Limitations (fig. 5-2-1) which are marked on the various instruments are not necessarily repeated in the subsequent text. When further explanation of cer- tain markings is required, refer to the specific area of discussion. 5-2-3.  Instrument Glass Alignment. All instruments with range markings on the glass have short  white  alignment  marks  extending  from  the  dial glass onto the rim of the indicator. These slippage marks appear as a single line when limitation markings on the glass properly align with the proper increments on the dial face. However, the slippage marks appear as sepa- rate radial lines when a dial glass has rotated 5-2-4.  Rotor Limitations. Refer to figure 5-2-1 for limitations. Should 108 percent power off be inadvertently exceeded, no entry need be made  in  DA  Form  2408-13-1  unless  the  rotor  system accelerates to  111 percent or above. Even though no action is required when RPM exceed 108 percent power off but remains less than 111 percent, willful operation should  not  be  conducted  in  this  range.  Operation  be- tween 96 and 92 percent is permitted when water taxiing. 5-2-5.  Inoperative Cruise Guide Indicator. Flight at or below 98 percent RRPM with an inoperative cruise guide indicator is prohibited. 5-2-6.  Starting and Shutdown Limits. The APU shall not be started with a tailwind in excess of 25 knots. Main engines shall not be started with a tailwind in excess of 10 knots. The rotor blade start-up and shut- down limits of figure 5-7-1 shall be observed. if it be- comes necessary to shut down in conditions outside the limits shown in figure 5-7-1, the following precautions are recommended: a. Aircraft  should  be  landed  in  an  area  which  is clear, as level as possible, and at least 300 feet away from any vertical obstructions, abrupt changes in ground terrain, trees, bushes, fences, etc. b. Aircraft  should  be  oriented  such  that  the  wind would be coming in at the left side. If the pilot is unsure of the wind direction after landing, a crew member should be dispatched beyond the rotorwash to make a true wind direction determination before engines are secured.







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