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The McNally 1006817 Upper Liner M Model, S-92 is a dedicated upper liner designed for use with McNally blade clamps and M model rotor blades, including Sikorsky S-92 applications as specified in the technical data. It provides a contoured upper contact surface that matches the blade profile, helping to prevent damage while the blade is secured in the clamp.
This liner is ideal for operators and MRO facilities that regularly service S-92 or similar rotorcraft and need a configurable clamp system that can be adapted to different blade families. By using an aircraft-specific liner, maintenance teams can follow OEM handling guidelines while still leveraging the same clamp hardware across multiple fleets.
Key Features
- Upper liner specifically matched to the M model and S-92 blade geometry for proper fit within the McNally blade clamp
- Spreads clamp load along the blade’s upper surface to reduce risk of leading- or trailing-edge damage and protect paint and erosion coatings
- Designed to be used with the Lower Liner M Model, S-92 (1006818) as a complete liner set
- Supports rotor blade handling during removal, installation, rack storage, and transport operations
- Built for repeated service in aviation hangars and ground support environments, with materials chosen for durability and stability
- Appropriate for helicopter fleet operators, service centers, and OEM or Tier-1 manufacturing sites that manage M model or S-92 rotor blades
The 1006817 Upper Liner M Model, S-92 helps aviation maintenance professionals safely clamp and support blades in the McNally system without compromising blade surfaces. In combination with its matching lower liner, it provides a reliable, aircraft-specific solution for S-92 and other M model blade handling tasks.
| General Information | |
|---|---|
| Part # | 1006817 |
| Manufacturer | McNally |
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AIRCRAFT COMPATIBILITY
This item is for use on all aircraft.
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QUESTIONS & ANSWERS
An upper liner acts as a protective interface between the rotor blade and the blade clamp during handling, storage, or maintenance activities. It helps shield the blade’s leading edge and bond line from direct contact, pressure, and abrasion. By absorbing clamp forces, the liner protects critical aerodynamic surfaces from damage that could affect performance or service life.
The leading edge of a rotor blade is one of its most critical aerodynamic surfaces and is highly susceptible to damage. Even minor chipping, scratching, or corrosion can disrupt airflow, reduce efficiency, or lead to more serious structural issues over time. An upper liner helps preserve this area during ground handling, when blades are most susceptible to damage.
Upper liners are used in conjunction with blade clamps to distribute clamping pressure evenly across the blade surface. Instead of allowing metal or rigid clamp components to contact the blade directly, the liner serves as a sacrificial barrier. This reduces localized stress and helps prevent surface marring, delamination, or bond line damage.
The National Stock Number (NSN) for the McNally 1006817 Upper Liner is 1680-01-567-8603. Having an NSN is essential for accurate sourcing through military, government, and standardized procurement systems. It ensures maintenance teams receive the exact approved component required, rather than a similar-looking substitute that may not meet application requirements.
Uneven clamping pressure can create stress concentrations that damage composite materials or weaken bond lines. Upper liners help spread loads evenly across the blade surface, reducing the risk of cracking, indentation, or long-term fatigue. This is especially important for modern composite rotor blades with tight structural tolerances.
Upper liners help seal and protect the bond line where the leading edge meets the blade structure. By limiting moisture intrusion and preventing direct abrasion, they reduce the risk of corrosion and composite delamination. This added protection supports longer blade life and reduces the need for unplanned repairs.
Yes, upper liners are typically designed to match specific blade profiles and clamp configurations. The McNally 1006817 Upper Liner is intended for use with compatible blade clamp systems and rotor blade geometries, such as those found on the S-92 platform. Using the correct liner helps ensure proper fit, protection, and load distribution.
Upper liners protect the top and leading-edge areas of the blade, while lower liners support and protect the underside where the blade interfaces with the clamp. Together, they create a controlled, cushioned interface that fully protects the blade during securing and handling. This modular liner system allows blade clamps to safely accommodate a wide range of blade designs.
Upper liners are exposed to repeated pressure, handling, and environmental conditions, making them a wear item over time. Keeping spares available helps avoid delays during blade handling or transport operations. It also ensures technicians can maintain proper protection standards without reusing liners that may no longer provide uniform load distribution.
