Par 2.3.11 Page 11
2.3.11.2.9 Certification statement of procedures used;
2.3.11.2.10Traceability documentation; and
2.3.11.2.11Signature of an authorized agent.
2.3.11.3 Retention of Repair Records. The operator must retain its repair records in accordance with its established procedures to comply with the requirements of § 121.380.
2.3.12 CLS Components in the Minimum Equipment List (MEL).
2.3.12.1 Dispatch Deviation Procedures. An operator must ensure the aircraft MEL contains adequate instructions, or references an appropriate manual, for dispatch deviation procedures that describes:
2.3.12.1.1 The total number of items installed and minimum number required for dispatch;
2.3.12.1.2 The loading limitations because of missing or defective equipment;
2.3.12.1.3 The references showing location of loading restrictions;
2.3.12.1.4 The appropriate category for repair; and
2.3.12.1.5 The instructions for ensuring MEL limitations are included in W&B computations and the load plan.
2.3.12.2 Procedures for Inoperative or Missing CLS Components. An operator should include procedures for inoperative or missing CLS components in the operator MEL. These procedures should include any requirements for:
2.3.12.2.1 Reconfiguration of the aircraft, if necessary;
2.3.12.2.2 Voiding of adjacent positions, if necessary;
2.3.12.2.3 Accounting for limitations;
2.3.12.2.4 Notification to the PIC and other appropriate personnel the operator deems necessary of the missing components;
2.3.12.2.5 Instructions for ensuring MEL limitations and/or restrictions are included in W&B computations and the load plan; and
2.3.12.2.6 Annotation in the aircraft maintenance logbook.
2.3.13 Installed Nets in the Maintenance Program. An operator maintenance program must contain procedures for maintenance and inspection of installed vertical and horizontal cargo compartment nets and 9G barrier nets.
Par 2.3.13 Page 12
2.3.13.1 The Program Should Encompass:
2.3.13.1.1 In-house or vendor repair procedures;
2.3.13.1.2 Receiving inspection procedures; and
2.3.13.1.3 Serviceability limitations.
2.3.13.2 Authorized Vendor List. The operator should include vendors on its authorized vendor list, and any required inspection item requirements.
2.3.14 Smoke Barriers.
2.3.14.1 Smoke Barrier Control Procedures. All smoke barriers act as a blockade between the cargo and crew, preventing smoke and flames from entering the passenger cabin and flight deck areas of the aircraft. They can be permanent or attachable and in a variety of forms, such as doors or curtains. An operator must have procedures to control the airworthiness and subsequent operational serviceability of smoke barriers. The operator should provide aircraft-specific training on the description, operation, function, and preflight of smoke barriers.
2.3.14.2 Inspection. Inspect the overall condition of the smoke barrier curtain, if installed, or cockpit door seal, barrier net assembly, or solid bulkhead. Ensure that the net (if used) has the proper rating for its intended G-loading. Inspections of the smoke barrier should include, at a minimum:
2.3.14.2.1 The smoke barrier curtain must be free of tears, holes, and cuts to prevent smoke from entering the forward cabin and flight deck;
2.3.14.2.2 The cockpit door seal, for condition and integrity;
2.3.14.2.3 The barrier net, for condition and security (i.e., check for frayed straps, hardware integrity, and proper markings);
2.3.14.2.4 Cargo compartment retention nets, for condition and security;
2.3.14.2.5 The solid bulkhead, for condition and security; and
2.3.14.2.6 The required placards (such as loading, fire suppression, and so forth) for condition, legibility, and security.
Par 2.4.1 Page 13 SECTION 2.4. UNIT LOAD DEVICES AND CARGO RESTRAINT DEVICES
2.4.1 Restraints. Aircraft cargo restraint methods come in two general categories: primary and supplemental. An operator has overall responsibility for ULDs and other cargo restraint devices and should have FAA-accepted procedures to control the operational serviceability of them, whether a primary or a supplemental restraint. When primary or supplemental restraint is attached directly to the aircraft structure, see Section 2.8, Transport of Special Cargo, for additional guidance.
2.4.2 Primary Restraint. This is the restraint of the cargo payload to the aircraft structure for regulatory load conditions (e.g., flight and emergency landing). This restraint secures cargo in the forward, aft, vertical, and lateral directions. Primary restraint is used to secure:
2.4.2.1 Cargo:
2.4.2.1.1 To a pallet using applicable net (net is the primary restraint);
2.4.2.1.2 Within a container (container is the primary restraint); or
2.4.2.1.3 To the aircraft structure (straps, ropes, etc. is the primary restraint).
2.4.2.2 ULD—to the aircraft structure using the CLS (e.g., locks and side rails).
2.4.2.3 WBM Provisions. Some airplane WBMs may provide additional tiedown to the aircraft structure to restrain ULDs if the following conditions exist:
2.4.2.3.1 The ULD weight limit is limited either by restraint configurations or by missing and/or inoperative restraints.
2.4.2.3.2 The ULD is loaded to a weight greater than allowable for the chosen loading position with all restraints operative, and a greater weight is allowed by the aircraft WBM with tiedown (e.g., the floor is more capable than the restraint system).
NOTE: See Section 2.8 for additional guidance.
2.4.3 Supplemental Restraint. Supplemental restraint is additional restraint that prevents shifting and is used to stabilize cargo to a pallet or container. When supplemental restraints are attached to the CLS or aircraft structure, it creates a parallel load path to the ULD, therefore classified as special cargo. See Section 2.8 for additional guidance. An exception would be stabilization straps in a certified bulk compartment.
2.4.4 ULDS and Other Cargo Restraint Devices.
2.4.4.1 ULD Definition. A ULD is a device for grouping, transferring, and restraining cargo for transit. It may consist of a cargo pallet and cargo net combination or a container as defined in the current editions of National Aerospace Standard (NAS) 3610, Cargo Unit Load Devices – Specification For; Aerospace Standards (AS) 36100, Air Cargo Unit Load Devices – Performance Requirements and Test Parameters; and TSO-C90, Cargo Pallets, Nets and
Par 2.4.4 Page 14 Containers (Unit Load Devices). These documents do not include a cargo pallet and cargo strap combination. When restraining a pallet and net ULD into the aircraft, the aircraft may be the weakest link in the certified load path. The term ULD includes the following equipment:
2.4.4.1.1 Pallets and nets.
2.4.4.1.2 Certified and non-certified aircraft containers.
2.4.4.2 Types of ULDs.
2.4.4.2.1 Background.
2.4.4.2.1.1 Certified ULDs are defined in aircraft WBMs and require no further analysis. However, non-certified ULDs and other payloads require further analysis to determine if the aircraft and restraint system is structurally adequate.
2.4.4.2.1.2 ULDs designs may exceed the structural capability of an aircraft. To preclude failures of the aircraft cargo restraint system the requirements of the aircraft WBM must be observed.
2.4.4.2.2 Certified ULD. A ULD meeting the requirements of TSO-C90; STC requirements, if applicable; or other FAA-approved certification standards. A certified ULD is structurally capable of restraining a load and/or protecting the aircraft systems and structure.
Only ULDs that are permitted by the aircraft WBM (TC or STC) are certified for use on that aircraft. To remain a certified ULD for an aircraft, the ULD must be restrained by the aircraft’s CLS, such as pallet locks and side guides. A certified pallet and a certified net can be combined and certified as a unit. The operator should have on file for all its certified ULDs an FAA approval letter, certificate, or other certifying document, such as a conformance certificate provided by the ULD equipment manufacturer.
2.4.4.2.3 Certified Cargo Pallet and Net (ULD). Most operator WBMs recognize a TSO cargo pallet and net combination as the primary restraint for unitized cargo. A cargo pallet net is the only restraint device that takes the shape of the cargo while restraining the load in all directions, so that the load is spread to the net fittings and pallet edge rails.
2.4.4.2.4 Non-Certified ULDs. A ULD that does not meet the TSO-C90 or PMA certification requirements, and/or is not listed in the aircraft WBM (TC or STC). Non-certified ULDs should meet a standard (see Appendix B, Guidance Material, for suggested standards).
The operator should have documentation stating its design criteria for manufacturing the noncertified ULD.
2.4.4.2.5 Active ULDs.
2.4.4.2.5.1 Active ULDs are ULDs with active temperature control systems for transporting temperature sensitive cargo. Unlike the typical ULD, active ULDs are capable of heating and/or refrigerating as required. These systems consist of a highly insulated container with a battery operated heating/cooling system integrated into the construction of the container.
Active ULDs are intended to be operating during flight. Active ULDs are battery powered in
Par 2.4.4 Page 15 flight and are only recharged while on the ground. The “active” components of these units typically consist of a vapor cycle refrigeration/heat pump type system that is powered by various types of large batteries, depending on the manufacturer.
2.4.4.2.5.2 Only Active ULDs approved under part 21, § 21.8(d) or § 21.305(d); a TC; or an STC may be used on U.S.-registered aircraft and marked with an “Active Unit Load Device” placard (see Appendix I, Active Unit Load Device Marking). Additionally, if an operator intends to deploy these containers in their fleet, they should have procedures in their manuals to ensure only containers that are properly prepared, and which meet the handling and airworthiness requirements of the manufacturer, are carried on an aircraft. To carry these devices, operators should incorporate or reference the pertinent parts of the device’s certification documents into its manual. These may include:
1. Required markings, placards, and labeling;
2. ICAs to include proposed limitations and restrictions necessary to safely carry the device on an aircraft; and
3. Operating instructions for the device.
NOTE: Hazmat procedures in Title 49 of the Code of Federal Regulations (49 CFR) may apply to the container’s contents.
NOTE: A recodification of part 21, effective April 2011, changed the reference § 21.305(d) to § 21.8(d).
2.4.4.2.6 Temperature-Controlled Shipping Containers. Temperature-controlled shipping containers are devices designed to maintain their contents within strict temperature controls. These devices may bear a TSO, STC; PMA, or be allowed by the TC. These units should be approved in the limitations section of the certification document for use with certain Net-Pallet combinations. To carry these devices, operators should incorporate or reference the pertinent parts of the device’s certification documents into its manual. These may include:
2.4.4.2.6.1 Required markings, placards, and labeling;
2.4.4.2.6.2 ICAs, to include proposed limitations and restrictions necessary to safely carry the device on an aircraft; and
2.4.4.2.6.3 Operating instructions for the device.
NOTE: Hazmat procedures in 49 CFR may apply to the container’s contents.
2.4.4.3 Other Restraint Devices.
2.4.4.3.1 Other Types of Cargo Restraint Devices. The operator may use cargo restraints such as straps, ropes, cables, and nets. These restraints must be approved per aircraft manufacturer W&B documentation or STC holder documentation. The operator’s manual should
Par 2.4.4 Page 16 address their use, serviceability limitations and a process to follow if failed restraints are identifed while in use. If the operator doesn’t use an authorized cargo pallet/net combination as the primary restraint, the operator’s manual should have policies and procedures to address this issue. For example, if a strap is used as the primary restraint, the cargo may be:
• Loaded in an aircraft compartment that meets the type design for compartment restraint, or
• Restrained by cargo straps or other authorized devices to the aircraft as described in the aircraft’s manual, an STC supplement, or a WBM.
2.4.4.3.2 Certified Straps. These devices should meet the requirements of TSO-C172, Cargo Restraint Strap Assemblies. In it, the FAA describes the minimum performance standards (MPS) by which cargo restraint strap assemblies are approved and identified with applicable TSO markings.
2.4.5 Determining ULD Compatibility. It is critical to safety of flight for the operator to have procedures confirming that ULDs on board an aircraft are compatible with the aircraft, regardless of who owns the ULD. Not all ULDs are authorized as compatible with all aircraft, so an operator should have procedures for:
2.4.5.1 Compatibility. Ensure certified and non-certified ULDs are compatible with the aircraft and do not present a hazard to the aircraft.
2.4.5.2 Standards. Ensure non-certified ULDs meet a standard (see Appendix B for suggested standards).
2.4.5.3 Communicate. Inform employees and vendors loading aircrafts converted from passenger to all-cargo by an STC that the aircraft could have different ULD requirements than other STC conversions or production aircraft configurations in the operator’s fleet.
2.4.5.4 Differences. Ensure personnel understand that compatibility, limits, or restrictions may exist between similar aircraft types with STC conversions, and that the aircraft may have been produced as a freighter by a TC holder. The following list details examples of the differences:
2.4.5.4.1 Aircraft weight limits;
2.4.5.4.2 Cargo zone index changes forward/aft body;
2.4.5.4.3 CG limits;
2.4.5.4.4 Forward and aft body structure loading limits;
2.4.5.4.5 Fuel index tables;
2.4.5.4.6 Individual compartment maximum loads;
2.4.5.4.7 Lateral cargo unbalances;
2.4.5 Page 17
2.4.5.4.8 Main deck door opening variances;
2.4.5.4.9 Maximum allowable loads limited by restraint;
2.4.5.4.10 Maximum allowable takeoff weight limits;
2.4.5.4.11 Maximum area load limits;
2.4.5.4.12 Maximum cargo zone load limits, including cumulative loads above and below deck;
2.4.5.4.13 Maximum cumulative loads aft to forward;
2.4.5.4.14 Maximum floor loading limits;
2.4.5.4.15 Maximum ramp weight limits;
2.4.5.4.16 Maximum ULD gross weight restrictions by aircraft position;
2.4.5.4.17 Missing inoperative cargo restraint limits;
2.4.5.4.18 Reduced over wing zone capabilities;
2.4.5.4.19 ULD height restrictions;
2.4.5.4.20 Asymmetrical load limits; and
2.4.5.4.21 Zero fuel weight restrictions.
2.4.5.5 ULD Contour and Dimensions. Compare the size of the main and lower deck compartment door openings with the contour and dimensions of ULDs to be loaded. An operator should take into consideration any height restriction within the aircraft cargo compartments.
2.4.5.6 Approved ULD Limitations. Ensure approved ULD limitations are maintained in the manual. An operator should base these limitations on data from applicable aircraft WBMs or STC supplemental WBMs. The limitations should identify which ULDs are compatible with specific aircrafts, and should also be easily accessible by all affected persons.
NOTE: The limitations section of the AFM or AFM supplement may include information from the aircraft WBM.
2.4.5.7 Authorized ULDs. Ensure its aircraft WBM or other appropriate manual states which ULDs may be carried aboard the aircraft on the main deck or lower lobes. In certain instances, particularly with an aircraft’s lower lobes, certain compartments may be certified to carry bulk or restrained cargo, or both. The WBM or other appropriate manual should identify the ULDs by the type authorized to be carried aboard the aircraft, considering the aircraft and CLS capabilities.
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2.4.5.8 Use of Non-Certified ULDs. Ensure the operator does not use non-certified ULDs in any compartment of an all-cargo or combination aircraft, unless (1) the ULDs are authorized by aircraft manufacturer or WBM, or (2) tiedown instructions describe how to restrain the ULDs as bulk cargo.
2.4.5.9 Unauthorized Pallet and Net Combinations. Ensure employees and vendors don’t combine incompatible nets and pallets.
2.4.6 Responsibilities for the Maintenance and Repair of ULDs, Pallets, and Nets. ULDs, pallets, and nets must be maintained under an operator’s or vendor/supplier’s maintenance program that satisfies the ICAs of the ULD manufacturer. The operator should have a program to determine the serviceability of the ULD when it is intended to be placed on board the aircraft and ULD traceability through their authorized vendor list which is made available to the FAA.
2.4.7 Responsibilities of an Operator After Purchasing/Leasing a ULD.
2.4.7.1 Certified and Non-Certified ULDs.
2.4.7.1.1 Certified ULDs.
2.4.7.1.1.1 New Certified ULDs. When an operator purchases/leases new certified ULDs, it should perform a first article inspection (see Appendix C, Definitions Related To Air Cargo Operations) of the ULD to confirm its conformance to the type design, and is eligible for installation on the operator’s aircrafts. The equipment manufacturer must show conformity on subsequent deliveries of new ULD equipment.
2.4.7.1.1.2 Used Certified ULDs. When an operator purchases/leases used certified ULDs, it should perform a serviceability inspection, conducted by appropriately trained FAA-certificated personnel, if existing records don’t confirm the ULD’s serviceability. After completing the inspection, the operator issues a tag verifying the serviceability of the ULD before placing it into service. After an initial inspection, the operator should then maintain its own maintenance inspection and repair records for the ULD. If the ULD has appropriate records to verify its serviceability, the operator should perform a receiving inspection in accordance with its procedures.
2.4.7.1.2 Non-Certified ULDs. When purchasing or leasing a new or used non-certified ULDs, the operator should:
2.4.7.1.2.1 Obtain the manufacturer’s current CMMs and illustrated parts list, subsequent manual revisions, service letters, or SBs;
2.4.7.1.2.2 Verify that the manufacturer establishes clearly defined and tested serviceability limits in accordance with IATA, SAE, or ISO standards, or another standard acceptable to the FAA;
2.4.7.1.2.3 Provide a trained, qualified, and authorized person to perform a quality audit of a repair/overhaul facility where the ULDs are repaired/overhauled;
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2.4.7.1.2.4 Check that the manufacturer designs all ULD equipment to allow venting during changes in air pressure, if required;
2.4.7.1.2.5 Check that only OEM-approved parts were used during manufacturing;
2.4.7.1.2.6 Check that the manufacturer issues spare part conformity certificates;
and
2.4.7.1.2.7 Perform a first article inspection of the ULD received to ensure its serviceability.
2.4.7.1.3 Active ULDs. In addition to the certified ULD requirements under subparagraph 2.4.7.1.1 above, consult with the FAA certificate management office (CMO) on the operational requirements.
2.4.7.2 Receiving a Purchased/Leased ULD. When receiving a ULD, an operator should have a trained, qualified, and authorized personnel perform a receiving inspection of the ULD, using the operator’s procedures. The receiving procedures should include processes, instructions, and guidelines to:
2.4.7.2.1 Check each ULD before it is put into service;
2.4.7.2.2 Review the required documentation for new and repaired ULDs to ensure the ULD is serviceable; and
2.4.7.2.3 Conduct a visual inspection of the ULD.
NOTE: FAA-certificated personnel do not need to conduct receiving checks.
The operator may designate a trained, authorized, and qualified person to conduct the checks. Receiving checks don’t determine the airworthiness of a ULD because a repair vendor or the ULD equipment manufacturer has confirmed the ULD’s serviceability before return to service.
2.4.7.3 Maintaining ULD Repair Records. An operator should have procedures for retaining certified and non-certified ULD repair records. An operator may maintain its own records, or have repair vendors maintain the records, provided the operator can access them upon request within a reasonable period of time.
2.4.7.4 Procedures for Maintaining and Repairing ULDs. An operator should have procedures to maintain and repair certified and non-certified ULDs. The procedures should be the same for both types of ULDs, except for establishing appropriate damage limits and specific repair procedures. The procedures should:
2.4.7.4.1 Clearly state the data supporting the maintenance and repair.
2.4.7.4.2 Detail transporting damaged ULDs aboard its aircraft to a repair station, provided the damaged ULDs do not pose a hazard to the safety of flight. The procedures would include restraining the ULD as bulk cargo if necessary.
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2.4.7.4.3 Address how frequently the operator or repair vendor should check ULD tare weights, and how it should mark updated tare weights on ULDs. The operator should manage control of ULD tare weights by documenting them and retaining the documentation using operator procedures.
2.4.7.5 Standards for Repair of ULDs. An operator should have procedures to ensure that:
2.4.7.5.1 Personnel who repair ULDs are trained, qualified, and authorized;
2.4.7.5.2 ULDs are repaired per the operator’s maintenance program;
2.4.7.5.3 Parts for ULD repair meet or exceed equipment manufacturer standards, and are authorized by either the ULD manufacturer or the operator’s processes using FAA-accepted data;
2.4.7.5.4 The appropriate current data is available to repair the ULD, including operator maintenance manuals, ULD manufacturer maintenance manuals, SBs, Airworthiness Directives (AD), ULD manufacturer CMMs, or other FAA-accepted data;
2.4.7.5.5 The tare weight of each ULD is checked using the operator’s procedures;
2.4.7.5.6 The new tare weight is marked on each ULD using the operator’s procedures; and
2.4.7.5.7 ULD and associated component or article repair is per part 43, whether the operator or a repair vendor performs the repairs.
2.4.7.6 Use of a Repair Station/Vendor to Repair ULDs.
2.4.7.6.1 An operator should provide its repair vendors with written authorization to repair its ULDs, and ensure the availability of all necessary data and manuals for repairing its ULDs.
2.4.7.6.2 An operator should conduct audits of contracted repair stations:
2.4.7.6.2.1 For the vendor’s training program, and
2.4.7.6.2.2 To ensure repair stations comply with the operator’s maintenance program requirements.
2.4.7.7 Returning a ULD to Service. An operator should have procedures for repairing unserviceable ULDs and approving them for return to service. As required by part 43, only appropriately trained and FAA-certificated personnel can return a ULD to service. Personnel should return ULD equipment to service under the requirements of the applicable CMM or operator instructions. FAA-certificated repair stations operating under 14 CFR part 145 should return ULDs to service using operator procedures.
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2.4.7.7.1 An operator may use FAA-accepted data in place of the requirements of the manufacturer’s CMM. An operator may also choose to strictly follow the manufacturer’s maintenance procedures. Regardless, an operator should clearly state which data it uses in its manual system.
2.4.7.7.2 An operator should use its CASS to verify the performance and effectiveness of its CLS maintenance program and provide corrections to any deficiencies discovered in the program.
2.4.8 ULD and Restraint Damage Limits.
2.4.8.1 Identifying or Revising Damage Limits. It is important that the operator specify damage limits for ULDs and related restraint equipment. The operator may use the damage limits provided by the manufacturer or may develop its own damage limits, with FAA acceptance. If the operator develops its own damage limits, it should:
2.4.8.1.1 Establish a procedure for developing the new damage limits;
2.4.8.1.2 Provide the FAA with data to support its new damage limits; and
2.4.8.1.3 Obtain FAA acceptance before using the new damage limits.
2.4.8.2 Standardization of Damage Limits for ULDs. An operator may standardize damage limits for ULDs transported upon their aircraft. The operator doesn’t need FAA approval if the operator applies the most restrictive damage limits categorized by the type of ULD. An operator publishing less restrictive damage limits should provide the FAA with engineering data to support its decisions.
2.4.8.3 Exceeding Allowable Damage Limits of a ULD. A container that exceeds allowable damage limits, with damage to its shell, may be accepted for use by installing an authorized net over the shell and using an authorized pallet/net combination. A reduced-weight requirement may be necessary when an operator uses this procedure. The operator should develop procedures for using the damaged ULD with a net.
2.4.9 Establishing Usage Limits for Cargo Straps. Cargo strap assemblies should be determined serviceable prior to use. If a cargo strap manufacturer does not provide damage limitations for their cargo straps, an operator should develop guidance to include, at a minimum, not using the strap if:
2.4.9.1 Buckle Latch Mechanism. A buckle latch mechanism will not lock or stay engaged.
This allows the web to slip while under tension, or may result in the web binding or being out of alignment.
2.4.9.2 Mechanism Integrity. Attached mechanisms, fittings, hooks, and rings are bent, deformed, cracked, broken, or missing.
2.4.9.3 Webbing Integrity. Webbing is partially cut or torn, knotted, unraveling, or has loose or missing sewn stitches.
Par 2.4.9 Page 22
2.4.9.4 Environmental Conditions. The strap is deteriorated due to environmental conditions.
NOTE: TSO-C172 is available and outlines requirements for manufacturing new cargo restraint straps. Cargo restraint strap assemblies authorized under previous Technical Standard Order Authorization (TSOA) may still be manufactured under the provisions of its original approval.
2.4.10 Additional Procedures for Cargo Nets. If the operator owns or leases cargo nets, it should consider using additional procedures for cargo nets, such as:
• Assigning a unique marking or serial number to nets and placarding that marking or number on the nets;
• Placarding nets with their damage limits;
• Attaching an identification tag to the operator’s nets; or
• Ensuring proper storage when not in use to prevent damage.
2.4.11 Temporary Installation of Restraints on a Cargo Net.
2.4.11.1 Installation Requirements. An operator may install temporary restraints on a cargo net if:
2.4.11.1.1 The temporary restraints are authorized for use;
2.4.11.1.2 The operator has a process in the manual system addressing the use and limits of temporary restraints; and
2.4.11.1.3 Personnel that install the temporary restraints are trained, qualified, and authorized.
2.4.11.2 Purpose. The operator may install temporary restraints for the purpose of addressing items such as:
2.4.11.2.1 Using a bridge strap to bridge cut or otherwise damaged ropes, or missing or damaged fittings;
2.4.11.2.2 Installing temporary fittings and hooks to compensate for damaged or missing fittings, using equipment manufacturer or operator procedures; or
2.4.11.2.3 Installing net corner and supplemental lashing lines.
2.4.12 Performing Operational Checks on ULDs or Other Cargo Restraint Devices. An operator should perform an operational check for damage before using ULDs and other restraint devices for movement or buildup, and should conduct a final serviceability check before loading cargo aboard the aircraft.
2.4.12.1 Purpose. Operational checks should not determine a ULD’s airworthiness. Instead, they ensure the ULD or other restraint devices do not have obvious damage greater than their damage