0013 00 TM 1-1670-260-12&P __________________________________________________________________________________________   3.    RECOVERY FLIGHT PARAMETERS AND PRECAUTIONS Flight parameters for the applicable recovery helicopter are specified in Table 1. Table 1. Recovery Helicopter Flight Parameters Parameter CH-47 Recovery Helicopter UH-60 Recovery Helicopter Maximum Airspeed: 30 Knots Indicated Air Speed (KIAS) 30 KIAS Maximum Bank Angle: 20 Degrees 20 Degrees Maximum Rate-of-Climb 1000 Feet Per Minute (FPM) 1000 FPM Maximum Rate-of-Descent 1000 Feet Per Minute (FPM) 1000 FPM Drogue Chute Optional (See Note Below) Optional (See Note Below) Maximum Allowable Vertical Load Factor 2g’s (See Note Below) 2g’s (See Note Below) Note: The maximum allowable load factor of 2g’s is not measurable by the crew; therefore it shall be assumed that the maximum vertical load factor has been exceeded during an OH-58 aerial recovery and that a post recovery inspection shall be performed.   WARNING Recovery helicopter should take care to ensure that the  disabled  helicopter  is  lifted  first  from  the  main rotor   hub   before   lifting   the   tail-boom   to   prevent excessive loading on the tail-boom. (Recommend an initial  attitude  of  approximately  5  degrees  nose  up prior to hoisting helicopter.) Once  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. 0013 00-2