Required Inspection Items (RII) and Inspector Authorization

When an aircraft mechanic completes a repair or alteration, the final step is typically a return-to-service authorization signed by an appropriately certificated individual. But on large air carriers operating under 14 CFR Part 121 or 135, certain tasks are so safety-critical that a single mechanic's sign-off is not enough. These tasks are called Required Inspection Items (RII), and they demand a formally designated, independent inspector to review and approve the work before the aircraft flies again. Understanding RII—what they are, who can perform them, and how the authorization system works—is foundational knowledge for any Aviation Maintenance Technician (AMT) preparing for FAA certification or stepping into line maintenance at a certificated air carrier.

This article examines RII from the regulatory foundation through the practical, cockpit-level implications, covering the rules in 14 CFR Part 121, the concept of Inspector Authorization as it applies to repair stations and air carriers, and the common pitfalls that appear on FAA knowledge tests.

Regulatory Foundation of RII

The authority for Required Inspection Items comes from 14 CFR §121.369 (for Part 121 air carriers) and parallel provisions in Part 135. These regulations require each air carrier to maintain a maintenance manual that identifies specific maintenance tasks as Required Inspection Items. The carrier itself—not the FAA directly—defines the specific list, but the FAA must approve the carrier's maintenance program, which includes that list.

The core principle behind RII is independence. The person who performs an RII task cannot be the same person who inspects and approves it for return to service. This separation of duties mirrors the concept behind the Inspection Authorization (IA) for general aviation, but in the air carrier world it is applied to a curated list of structurally and operationally critical items rather than to annual inspections broadly.

Typical examples of tasks that carriers designate as RII include: flight control system rigging and connections, engine control system rigging, landing gear rigging, structural repairs in primary load-bearing areas, and certain avionics installations that affect the flight crew's ability to control the aircraft. The exact list varies by carrier and aircraft type, but the common thread is that an error on these items could directly and immediately jeopardize flight safety with little or no warning to the crew.

Who Can Perform and Who Can Inspect an RII Task

An RII task has two distinct roles that must never be filled by the same individual on the same task:

• The Performing Mechanic: Must hold at least an FAA Airframe or Powerplant certificate (as appropriate to the work) and be authorized by the carrier to perform that type of maintenance. Part 121 carriers typically authorize mechanics through their training and qualification programs documented in the Operations Specifications and maintenance manual.
• The RII Inspector: Must be specifically designated by the air carrier as qualified to perform that inspection. The carrier's maintenance manual must spell out the qualifications, training, and authorization process for RII inspectors. An RII inspector must also hold the appropriate FAA mechanic certificate, but holding an FAA certificate alone does not automatically make someone an RII inspector—the carrier's formal designation is required.

This means that even a highly experienced A&P mechanic who walks in off the street cannot inspect an RII task unless that carrier has formally authorized them in accordance with the approved maintenance program. The carrier's quality control or inspection department is responsible for maintaining the list of designated RII inspectors and ensuring their currency and qualifications.

Inspector Authorization (IA) in General Aviation Context

It is important to distinguish the air carrier RII system from the Inspection Authorization (IA) that applies in general aviation under 14 CFR §65.91. An IA is a separate certificate issued by the FAA to an A&P mechanic who meets specific experience and currency requirements. An IA holder is authorized to:

• Approve an aircraft for return to service after an annual inspection.
• Approve major repairs and major alterations on certificated aircraft (by signing FAA Form 337).
• Approve an aircraft for return to service following a progressive inspection program approved under 14 CFR §91.409(d).
• Supervise and approve the return to service of an aircraft following an annual inspection performed by a non-IA mechanic.

To obtain an IA, a mechanic must hold both Airframe and Powerplant ratings, have held an A&P certificate for at least three years, have been actively engaged in maintaining aircraft during the preceding two years, and satisfactorily complete a test of their knowledge given by the FAA under 14 CFR §65.91(c), typically administered at an FAA Flight Standards District Office (FSDO). The IA must be renewed every 24 calendar months, and the holder must meet one of several activity requirements under 14 CFR §65.93 to renew—such as having performed at least one annual inspection each year during the prior 24 months, having actively participated in maintenance requiring IA privileges, or having completed an FAA-approved refresher course.

An important nuance: an IA is specifically a general aviation authorization. An IA holder working as a contractor or subcontractor for a Part 121 carrier does not automatically become an RII inspector by virtue of the IA alone. That designation must come from the carrier's approved program. Conversely, a carrier's RII inspector designation does not grant the individual the authority to perform annual inspections on general aviation aircraft—that still requires the FAA-issued IA.

RII and the Air Carrier Maintenance Manual

Every Part 121 air carrier must have an FAA-approved continuous airworthiness maintenance program (CAMP). Within the CAMP, the maintenance manual must identify all RII tasks and describe:

• The qualifications and training required for RII inspectors.
• The procedures by which inspectors are designated, tracked, and removed from designation.
• The method by which RII tasks are identified on work cards or job cards so mechanics and inspectors can clearly recognize them.
• The documentation procedures, including how the independent inspection is recorded.

Work cards for RII tasks typically carry a special designation—often a prominent symbol, color coding, or a separate sign-off block reserved for the inspector. The mechanic completes the work and signs the performance block, but the aircraft cannot legally be returned to service until the independent RII inspector signs the inspection block. Both signatures must be present, and both must be traceable to qualified individuals under the carrier's program.

Why RII Matters for Safety and Compliance

The history of aviation accidents and incidents demonstrates a clear pattern: human error in the maintenance of flight-critical systems—particularly flight controls and landing gear—can lead to catastrophic in-flight failures. RII exists precisely because these are the areas where a single oversight, a misrigged cable, or an incorrectly installed bolt can result in a crew losing control of the aircraft with no recovery option.

From a regulatory enforcement standpoint, failure to comply with RII requirements is treated very seriously by the FAA. An air carrier that permits an aircraft to depart without the required independent RII inspection sign-off is in direct violation of 14 CFR §121.369, and both the carrier and individual mechanics involved can face certificate action or civil penalties. Mechanics should understand that signing off an RII task for which they were both the performer and the inspector is a serious violation regardless of how well the work was done.

Key Numbers and Rules

• 14 CFR §121.369 — Requires Part 121 carriers to identify RII in their maintenance manuals and establish inspector qualifications.
• 14 CFR §65.91–65.95 — Governs the Inspection Authorization (IA) for general aviation.
• IA Experience Requirement: A&P certificate held for at least 3 years; actively engaged in maintaining aircraft for the preceding 2 years.
• IA Renewal Interval: Every 24 calendar months.
• Independence Rule: The person who performs an RII task and the person who inspects it must be two different individuals—always.
• Carrier Designation Required: An FAA A&P or IA alone does not qualify someone as an RII inspector; the air carrier's formal designation is mandatory.
• FAA Form 337: Used by IA holders to document major repairs and major alterations on general aviation aircraft; not applicable to air carrier RII tasks (which use the carrier's internal work documentation system).

Common Test Traps

• Confusing IA authority with RII inspector authority. An IA does not automatically authorize a person to perform RII inspections for an air carrier. The carrier must separately designate the inspector under its approved program.
• Thinking the performing mechanic can also inspect the RII task. The independence requirement is absolute. No matter how experienced or qualified the mechanic, they cannot inspect their own RII work.
• Misidentifying who sets the RII list. The air carrier develops the RII task list (subject to FAA approval of the CAMP), not the FAA unilaterally. Test questions may ask who is responsible for identifying RIIs.
• IA renewal confusion. The IA must be renewed every 24 calendar months (not annually). Failing to meet the activity requirements during that window causes the IA to lapse, and the holder must reapply through the FSDO.
• Assuming all maintenance requires an IA sign-off. An IA is needed for annual inspections and major repairs/alterations on general aviation aircraft. Routine preventive maintenance authorized under 14 CFR §43.3(g) by certificated pilots, and line maintenance tasks within a Part 121 CAMP, follow different authorization rules.

Mastering the distinction between RII in the air carrier environment and Inspection Authorization in general aviation—and understanding that both systems share the underlying goal of independent verification for safety-critical work—will serve any AMT well on the FAA knowledge test and throughout a professional maintenance career.