0015 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 Once  the  damaged  helicopter  is  connected  to  the recovery  helicopter  and  lifted  to  a  hover,  the  pitch attitude of the damaged helicopter must be checked to ensure a nose down attitude is achieved. A damaged 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 damaged 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  damaged  helicopter, hard  landing  of  the  damaged  helicopter  following recovery, UMARK component failure, or exceeding the flight parameters.  Report any unusual occurrences to the unit responsible for the Damaged helicopter. Exceeding the flight parameters may severely damage the main rotor assembly of the damaged helicopter, requiring component replacement.  Report the amount and duration of any flight parameter exceeded to the unit responsible for the damaged 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 damaged helicopter remains clear of ground obstacles.     0015 00-2