Structural Repair Manual (SRM) – Damage Limits & Approved Repair Methods

Structural Repair Manual (SRM)

The Structural Repair Manual (SRM) is a critical manufacturer manual used in aircraft maintenance. It provides approved procedures for inspecting and repairing structural damage to ensure aircraft safety and airworthiness.

Structural Repair Manual (SRM) showing damage limits, approved repair methods, and inspection criteria
SRM provides approved procedures, damage limits, and materials for safe and compliant structural repairs

What the SRM Covers

  • Structural Damage Limits: Defines acceptable limits of damage to the aircraft structure, including cracks, dents, and corrosion.
  • Approved Repair Methods: Step-by-step procedures for repairing structural damage in compliance with regulatory and manufacturer standards.
  • Materials and Fasteners: Specifies the approved materials, fasteners, and tools required for structural repairs.
  • Inspection Criteria: Provides guidance for post-repair inspections to ensure structural integrity and airworthiness.

Importance of Following the SRM

It is essential that all structural repairs follow the limits and procedures specified in the SRM. Deviating from approved methods can compromise the aircraft's structural integrity and violate regulatory requirements.

Maintenance engineers must always consult the SRM before performing repairs on critical structures such as wings, fuselage, empennage, and landing gear attachments.

Who Uses the SRM?

  • Line Maintenance Engineers – for minor structural inspections and damage assessment
  • Base Maintenance Engineers – for major structural repairs and overhauls
  • Aircraft Maintenance Organizations (AMOs) – to ensure compliance with approved repair procedures
  • Aviation Inspectors – to verify that structural repairs meet SRM requirements

Conclusion

The Structural Repair Manual (SRM) ensures that all structural repairs are performed safely, correctly, and in compliance with regulatory and manufacturer standards. Following the SRM protects aircraft integrity, reliability, and passenger safety.

References

  • FAA – Aviation Maintenance Handbook
  • EASA Part-145 & Part-M Regulations
  • ICAO Annex 6 – Operation of Aircraft
  • Aircraft Manufacturer SRM
  • ATA iSpec 2200

Published by AHA Apex Wing – Aviation Knowledge Hub

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