0002 00 TM 1-1670-260-12&P __________________________________________________________________________________________ 3. RECOVERY FLIGHT PARAMETERS AND PRECAUTIONS Flight parameters for a CH-47 recovery helicopter are specified in Table 1. Table 1. Recovery Helicopter Flight Parameters Maximum Airspeed: 50 Knots Indicated Air Speed (KIAS) Maximum Bank Angle: 25 Degrees Maximum Rate-of-Climb 1250 Feet Per Minute (FPM) Maximum Rate-of-Descent 2500 Feet Per Minute (FPM) Drogue Chute Optional WARNINGOnce the disabled helicopter is connected to the recovery helicopter and lifted to a hover, the pitch attitude of the disabled helicopter must be checked to ensure a nose down attitude is achieved. A disabled helicopter may rotate while in a hover. This rotation may cause slings of some UMARK rigging configurations to twist or to tighten at the main rotor assembly. The rotation will generally stop as airspeed is increased to approximately 5 to 10 knots. The recovery helicopter flight crew should minimize hover time. If oscillations of disabled helicopter develop during flight, tests have shown that lowering airspeed, returning to wings level flight, and initiating a climb has a stabilizing effect. It is critical for the recovery helicopter flight crew to report any unusual occurrences. For example, vertical bounce, severe jerking of the disabled helicopter, hard landing of the disabled helicopter following recovery, UMARK component failure, or exceeding the flight parameters. Report any unusual occurrences to the unit responsible for the disabled helicopter. Exceeding the flight parameters may severely damage the main rotor assembly of the disabled helicopter, requiring component replacement. Report the amount and duration of any flight parameter exceeded to the unit responsible for the disabled helicopter. The height above ground level may be difficult to determine during low-level UMARK operations due to the length of the sling system. Flight crews should exercise extreme caution during recovery operations to ensure the disabled helicopter remains clear of ground obstacles. 0002 00-2
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