WC393 Thrust Reverser Lubricant

WC-393 Thrust Reverser Lubricant is a specialized aircraft lubricant formulated for applications where high temperature and friction are present. The synthetic-oil formulation contains molybdenum disulfide (MoS₂), which leaves a residual lubricating film after the carrier volatilizes.

WC-393 is specifically associated with thrust-reverser lubrication and is used on components such as bushings, pivot points, and sliding surfaces where the applicable aircraft or component maintenance documentation calls for this lubricant. It is also used in certain surge bleed valve applications.

Manufacturer Part Number: WC-393
Alternate Part Number: WC393
NSN: 9150-01-253-9619

WC-393 Thrust Reverser Lubricant Features

• Designed for high-temperature, high-friction lubrication applications
• Contains molybdenum disulfide (MoS₂)
• Synthetic oil-based formulation
• Leaves a residual lubricating film after the fluid carrier volatilizes
• Helps reduce friction, seizure, galling, and scoring
• Non-gumming and non-corrosive formulation
• Does not contain grease, wax, silicone, or graphite
• Used for specified aircraft thrust-reverser lubrication applications

Aircraft Thrust Reverser Applications

WC-393 is used where aircraft maintenance documentation specifies this lubricant for thrust-reverser components. Applications can include thrust-reverser bushings, pivot points, guide rods, and sliding surfaces, depending on the specific aircraft and maintenance procedure.

Because thrust-reverser lubrication requirements vary by aircraft and component, always follow the applicable Aircraft Maintenance Manual (AMM), Component Maintenance Manual (CMM), or other approved maintenance documentation before applying WC-393.

Molybdenum Disulfide Lubrication

The key lubricating ingredient in WC-393 is molybdenum disulfide. After application, the non-carbonizing fluid carrier volatilizes and leaves a residual MoS₂ lubrication film on the treated surface. This makes WC-393 suited to applications where conventional oils or greases may not be appropriate.

WC-393 is also identified for certain surge bleed valve applications. Verify the applicable maintenance documentation before use on any aircraft system or component.

Product Specifications

Important Application Considerations

WC-393 should only be used where the applicable aircraft or component documentation specifies or permits its use. Do not assume that WC-393 is interchangeable with other thrust-reverser lubricants or anti-seize compounds.

Some aircraft maintenance procedures specifically caution against mixing WC-393 with other lubricants used on thrust-reverser components. Follow the applicable maintenance procedure for cleaning, preparation, application, and lubricant compatibility.

Frequently Asked Questions

What is WC-393?

WC-393 is a specialized thrust-reverser lubricant containing molybdenum disulfide dispersed in a synthetic oil carrier. It is intended for high-temperature and high-friction applications.

What is the difference between WC-393 and WC393?

WC-393 and WC393 are alternate ways of identifying the same lubricant part number. The hyphenated form, WC-393, is commonly used in aircraft maintenance documentation.

What is WC-393 used for?

WC-393 is used primarily for specified aircraft thrust-reverser lubrication applications. It may also be specified for certain surge bleed valve applications.

Does WC-393 contain molybdenum disulfide?

Yes. WC-393 contains molybdenum disulfide (MoS₂), which remains as a lubricating film after the fluid carrier volatilizes.

Does WC-393 contain silicone or graphite?

No. The WC-393 formulation is described as containing no grease, wax, silicone, or graphite.

What is the NSN for WC-393?

The NSN associated with WC-393 Thrust Reverser Lubricant is 9150-01-253-9619.

Can WC-393 be substituted for another thrust-reverser lubricant?

Do not substitute WC-393 for another lubricant unless the applicable aircraft or component maintenance documentation permits the substitution. Lubricant compatibility and application requirements can be specific to the thrust-reverser system.

Maintenance Note: Always consult the applicable aircraft or component maintenance documentation and the manufacturer's current Technical Data Sheet (TDS) and Safety Data Sheet (SDS) before use.