TM 1-1670-260-12&P 0017 00 __________________________________________________________________________________________  WARNING 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. 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.     4.    COMPONENTS REQUIRED Components of UMARK utilized during the one-hook, long-line recovery are listed in Table 2.  Common equipment used by the ground rigging crew, such as shockproof gloves, goggles, radios, etc., are not included in UMARK.   No additional tools are required for UMARK assembly or rigging of the helicopters. Table 2. UMARK Components Required Item Description Qty Item Description Qty Black/White 30 Ft Heavy Weight Sling 2 Shackle Assembly 1 Black/White 30 Ft Heavy Weight Sling with Bridle 1 Fixed Length Tie-Down (With Snap) 4 Green/White 150 Inches (12.5 Ft) Light Weight Sling 2 Fixed Length Tie-Down (Without Snap) 1 Blue/White 360 Inches (30.0 Ft) Light Weight Sling 2 Blade Sleeve Assemblies 4 Black/White 120 Inches (10 Ft) Light Weight Sling 1 Blade Pole Assembly 1 Sling Link Assembly 2 Cargo Hook Thimble 1 Box Link Assembly 2 Drogue Chute 1 0017 00-3