Aircraft structural repair is the process of restoring load-bearing airframe components to an airworthy condition using approved data (SRM, OEM, or DER), controlled processes, and fully traceable documentation under Part 145 regulations.
This article takes you from incident to RTS (Return-to-Service) safely and compliantly using SRM (Structural Repair Manual), OEM (Original Equipment Manufacturer), or DER (Designated Engineering Representative) data.
If damage is beyond SRM or on primary/pressurized structure, it is treated as major.
No data, no repair—Part 145 controls, NDT (Non-Destructive Testing) before/after, full traceability. Shop vs. AOG (Aircraft on Ground) as specifications allow.
From the perspective of a repair station, aircraft structural repair means restoring load-bearing airframe elements to an airworthy condition under approved data and documented processes.
Structural parts carry:
Examples:
If damage affects:
→ it is structural.
Structural repair = safety-critical repair
If a component contributes to structural integrity, its repair must follow approved engineering data and full compliance controls.
A compliant structural repair connects five elements:
Any weak link, and the repair fails audit—or worse, fails in service.
Primary:
→ highest scrutiny, strict data, and inspection
Secondary:
→ still controlled, but more flexibility (when allowed)
Minor vs. Major depends on impact to safety and required engineering approval.
Within SRM limits
No appreciable effect on:
→ straightforward approval path
Beyond SRM limits or affecting safety
Requires:
Small configuration change
No significant impact on aircraft characteristics
Affects:
→ requires engineering approval (OEM or DER)
Quick classification rule:
If the damage exceeds SRM limits, affects primary structure, or alters load paths → treat as major until engineering confirms otherwise.
Typical events:
For a deeper breakdown of damage types and inspection methods:
What Is Aircraft Structural Damage: Causes, Types, and How It Is Inspected
Damage is mapped using:
Assessment determines everything:
Accurate damage mapping defines whether the repair is minor vs major and which data path (SRM, OEM, DER) applies.
For how AOG structural repairs are executed in real conditions: Structural Aircraft On Ground Repair: A Field-Ready Playbook for Faster, Compliant Return to Service
We run 24/7 AOG for structural events—but the real skill is knowing what not to do on the ramp.
DER provides approved engineering solutions when:
Where DER adds value:
DER is not a shortcut
It is an approved engineering pathway that meets the same regulatory and safety standards as OEM data.
For a full comparison of DER vs OEM pathways: DER vs OEM: Stay Compliant and On-Schedule
Structural repair is part of a broader MRO ecosystem that integrates:
Explore service-level capabilities: MRO Services
For coordination across engineering, logistics, and execution: Repair Management
For rapid-response structural events: 24/7 AOG Services
For approved engineering pathways: DER Repairs
Is this a repair or an alteration—and when is it major?
A repair restores damage; an alteration changes configuration. It is major when it affects safety characteristics or exceeds standard data.
Do minor repairs become major?
Yes. Hidden damage or new findings can change classification.
Are DER repairs less safe?
No. They meet regulatory standards when properly executed and documented.
When is AOG appropriate?
When field conditions meet all process and compliance requirements.
Aircraft structural repair = controlled system, not a task
It combines classification, approved data, execution discipline, and documentation to ensure safe, compliant return-to-service.
As a repair station, the objective is simple:
Move from event → classification → approved data → execution → airworthy release
With no gaps in compliance, process, or documentation.
Whether on the ramp or in the hangar, the result must be the same:
A repair that is invisible in flight—and flawless in audit.
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