8. Light Weight Sling Assemblies (Figure 1, Sheet 1, Views A through E)
The light weight slings are constructed of synthetic braided materials. Two light weight sling configurations, in five
color-coded lengths, are included in UMARK. All light weight slings are small diameter and equipped with a sling
hook eye at each end. The bodies of the green/white slings (View A) are also equipped with a 25 inch long elastic
cord which is used to maintain tension on the slings during OH-58D and AH-64 Longbow recovery operations with
the crossbar assembly.
9. Heavy Weight Sling Assemblies (Views F and G)
The heavy weight slings are constructed of synthetic braided materials. All three heavy weight slings included in
UMARK are large diameter and color coded with black and white stripes. Each sling is 30 feet (360 inches) in
length. The heavy weight slings are all equipped with two separated large diameter hook eyes on the top end
(referred to at the double eye end) and one large diameter hook eye composed of two eyes lashed together on the
bottom end (referred to at the single eye end). In addition to having the same large diameter hook eyes, one sling
(View G) is also equipped with two bridle eyes approximately 7 feet (84 inches) from the top end.
10. Adjustable Length Tie-Down Assemblies (Sheet 2, View H)
The adjustable tie-down assemblies included in UMARK are constructed of synthetic braided materials and are
39.75 feet (477 inches) in length. The tie-downs function to secure the main rotor blades of the disabled/damaged
helicopter. Each tie-down is equipped with a snap hook at each end, and ten sling hook eyes, five on each side of
the tie-downs center line. The tie-down is attached to blade sleeve assemblies that have been attached to
opposite main rotor blades, and the center point of the tie-down is attached to the shackle assembly at the primary
lift point. Except for the AH-64D Longbow helicopter, adjustability is obtained by looping the tie-downs snap hook
through the blade sleeve assembly top D-ring and hooking the snap hook to a specific snap hook eye on one of
the five eyes on the snap hooks side of the tie-downs center line. The AH-64D uses the snap hooks only, without
using the snap hook eyes.
11. Sling Extension (View I)
The four sling extensions included in the UMARK are growth item for use with the RAH-66 helicopter.
12. Fixed Length Tie-Down Assemblies (Views J and K)
The fixed length tie-down assemblies included in UMARK are constructed of synthetic braided material and are 40
feet (480 inches) in length. Two configurations are provided. Four of the tie-downs (View J) have a fused top end
and a sling hook eye with attached snap hook at the bottom. A single tie-down (View K) has fused ends at both the
top and bottom ends.
13. Blade Sleeve Assemblies (Sheet 3, View L)
If the main rotor blades of a disabled helicopter are intact, the blades must be secured to prevent them from
flexing during transportation. Excessive upward and downward deflection of the blades due to aerodynamic
loading could result in damage to the blades and/or main rotor assembly. In addition, downward deflection of the
disabled helicopter main rotor blades will limit airspeed of the recovery helicopter. Installation of blade sleeves with
tie-downs will prevent the upward and downward deflection of the main rotor blades during transportation. The
blade sleeve assembly included in UMARK is designed for multiple helicopter configurations and is constructed of
fabric with attached straps and metal rings. Blade sleeve assembly pockets (1, 2, and 3) fit the following helicopter
a. Pocket 1 fits the OH-58A/C and OH-58D main rotor blades.
b. Pocket 2 fits the AH-1, UH-1, AH-64A, AH-64D, and UH-60 main rotor blades.
c. Pocket 3 is not currently used.