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
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
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
Black/White 30 Ft Heavy Weight Sling
Black/White 30 Ft Heavy Weight Sling with Bridle
Fixed Length Tie-Down (With Snap)
Green/White 150 Inches (12.5 Ft) Light Weight Sling
Fixed Length Tie-Down (Without Snap)
Blue/White 360 Inches (30.0 Ft) Light Weight Sling
Blade Sleeve Assemblies
Black/White 120 Inches (10 Ft) Light Weight Sling
Blade Pole Assembly
Sling Link Assembly
Cargo Hook Thimble
Box Link Assembly