MIL-DTL-25959 Tie Down, Tensioners, Cargo, AircraftThis specification covers two types of aircraft cargo tie down tensioners and excludes cargo chains. The tie down tensioners are considered to be aircraft Critical Safety Items \(CSI\). Type I \(10,000 lbs\) and Type II \(25,000 lbs\) cargo chains are governed under MIL-DTL-6458 and are procured separately from the tie down tensioners in this specification.

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MIL-DTL-25959H

3.12 Workmanship. The tie down tensioner, including all parts and accessories, shall be

constructed and finished in a thorough workmanlike manner. Workmanship objectives shall

include freedom from blemishes, defects, burrs and sharp corners and edges; accuracy of

dimensions, surface finish, and radii of fillets; thoroughness of welding, painting, and riveting;

marking of parts and assemblies; and proper alignment of parts and tightness of assembly

fasteners.

3.12.1 Bolted connections. Bolt holes shall be accurately punched or drilled and shall be

deburred. Threaded fasteners shall be tight and shall not work loose during testing or service

usage. All bolt installations which involve self locking or standard nuts will have at least two

complete threads protruding through the nut. These two threads include the chamfered end of

the bolt.

3.12.2 Riveted connections. Rivet holes shall be accurately punched or drilled and shall be

deburred. Rivets shall be driven with pressure tools and shall completely fill the holes. Rivet

heads shall be full, neatly made, concentric with the rivet holes, and in full contact with the

surface of the component.

3.12.3 Gear and lever assemblies. Gear and lever assemblies shall be properly aligned and

meshed and shall be operable without interference, tight spots, loose spots, or other irregularities.

Where required for accurate adjustment, gear assemblies shall be free of excessive backlash.

3.12.4 Cleaning. The tie down tensioner shall be thoroughly cleaned. Loose, spattered, or

excess solder; welding slag; stray bolts, nuts, and washers; rust; metal particles; pipe compound;

and other foreign matter shall be removed during and after final assembly.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classified as

follows:

a. Qualification inspection (see 4.2).

b. Conformance inspection (see 4.4).

4.1.1 Sampling for inspection. Unless otherwise specified, sampling and associated procedures

for formation of lots shall be in accordance with ANSI/ASQ Z1.4, Single Sampling Plan for

Normal Inspection, Level I. The Acceptance Quality Limit (AQL) shall be 0.4.