TP14038E — Standard Practices and DocumentationChapter 2 · 150 practice questions

Chapter 2: Standard Practices, Documentation, Tools & NDT

Includes 10 animated diagrams — view them live in the interactive theory reader.

Chapter Overview: Standard Practices, Documentation, Tools & NDT

This chapter covers the fundamental principles and procedures that govern aircraft maintenance engineering. It encompasses the correct use of tools, proper documentation practices, non-destructive testing (NDT) methodologies, and the regulatory framework that ensures aircraft airworthiness. The material integrates Canadian Aviation Regulations (CARs), industry standards (AC 43.13, Standard 566, Standard 571, Standard 573), and manufacturer specifications to provide a comprehensive foundation for safe and compliant maintenance practices.

Key Concepts Explained

1. Regulatory Framework and Compliance

The Canadian Aviation Regulations (CARs) form the legal backbone of aircraft maintenance in Canada. Key subparts include:

  • CAR 571: Governs maintenance standards and the requirement to report and address all defects affecting airworthiness. Any corrosion, crack indication, or anomaly found during inspection must be documented and reported to ensure proper evaluation and corrective action.
  • CAR 573: Mandates maintenance release procedures, including the requirement for independent inspections before signing off on completed work. A maintenance release cannot be issued without this verification.
  • CAR 605: Specifies journey log requirements, including the necessity for complete and accurate records of all maintenance actions before aircraft operation.
  • Standard 566: Addresses tool calibration, technician certification for NDT methods, and adherence to manufacturer specifications.
  • Standard 571: Emphasizes thorough inspections, proper troubleshooting, and the importance of securing components correctly.
Diagram — Standard Practices, Documentation, Tools & NDT Standard Practices, Documentation, Tools & NDT — Cadre réglementaire et opérationnel MAINTENIR LA NAVIGABILITÉ 1. CADRE RÉGLEMENTAIRE Règlement de l'aviation canadien (RAC) Normes 566, 571, 573 AC 43.13 — Pratiques acceptables 2. DOCUMENTATION Registre technique de bord Manuel de maintenance (MM) Fiches techniques / IPC 3. OUTILS ET ÉQUIPEMENT Outils manuels et de précision Étalonnage et traçabilité Outils spéciaux (TORQ, etc.) 4. CND (ESSAIS NON DESTRUCTIFS) Inspection visuelle (VT) Ressuage (PT) / Magnétoscopie (MT) RAC — Réglementation | Documentation — Traçabilité | Outils — Précision | CND — Intégrité structurale

2. Documentation Requirements

Documentation-airworthiness chain Documentation-airworthiness chain 1. DETECTION Anomaly observed: corrosion, crack, dent, leak, wear (RAC 571, AC 43.13) 2. REPORTING Notify a supervisor or a competent authority Peer assessment 3. CONSULTATION Maintenance manual (AMM) or AC 43.13 Approved procedures Engineer advice if required 4. DOCUMENTATION Date, time, technician name, description, location Traceability (RAC 573) 5. CORRECTIVE ACTION Approved repair Part replacement Anti-corrosion treatment Per AMM / AC 43.13 6. VERIFICATION Independent inspection if required (RAC 573) Quality control Compliance verified TORQUE WRENCH • Mandatory calibration • Steady tightening, no jerking • Star pattern for multi-bolts • Uncalibrated tool = out of service Standard 566 / AC 43.13 NON-DESTRUCTIVE TESTING • Certification required • Dye penetrant, magnetic particle, ultrasound, radiography • Confirm the indication RAC 571 / Standard 566 LOGBOOK & RELEASE • Complete and accurate before flight • All discrepancies rectified • Release = certificate of airworthiness after maintenance RAC 605 / RAC 573 TECHNICAL RECORDS • Actual aircraft configuration • Life-limited parts • Hours/cycles tracking • Airworthiness directives (AD) Compliance RAC 571 / 573 / 605 AIRWORTHINESS CERTIFIED — REGULATORY COMPLIANCE Continuous compliance loop

Journey Log: The primary document that must reflect all maintenance actions performed on an aircraft. It serves as the legal record of airworthiness and must be complete before flight.

Maintenance Release: A critical certification that the aircraft is airworthy after maintenance. Without it, the aircraft cannot be legally operated. Requirements include:

  • Verification that all discrepancies in the journey log have been rectified
  • Completion of required independent inspections
  • Accurate documentation of date, time, and technician's name for traceability

Technical Records: Must accurately reflect the actual aircraft configuration. Discrepancies between records and physical configuration must be documented and reported immediately.

Airworthiness Directives (ADs): Mandatory safety directives that must be checked and complied with before conducting maintenance. Outstanding ADs affect the aircraft's airworthiness status.

3. Tool Usage and Calibration

Torque wrench and calibration Torque Wrench and Calibration Applied Torque and Lever Arm Wrench body Socket Handle F T = F × d Lever arm (d) Fastener Correct Range and Calibration Certificate Torque Dial Correct range 0 100 Calibration Certificate Certificate No.: 2024-0587 Calibration date: 2024-03-15 Next calibration: 2025-03-15 Accuracy: ± 1% Common Usage Errors 1. Uncalibrated Use ✕ Tool marked "OUT OF SERVICE" and removed from use Risk: incorrect torque, loose or damaged fastener 2. Incorrect Tightening Circular tightening: uneven load distribution Use a star pattern ✦ 3. Insufficient Torque Below torque Loose fastener: risk of loosening in flight If torque is insufficient: inspect the fastener (damage, deformation) STANDARD PROCEDURE: 1. Verify calibration → 2. Apply torque evenly → 3. Follow a star pattern → 4. Inspect if torque is insufficient References: Standard 566, AC 43.13-1B, RAC 571 | Uncalibrated tool = out-of-service tool

Torque Wrench Critical Practices:

  • Calibration must be verified before use to ensure accurate readings
  • Using an uncalibrated or incorrectly calibrated torque wrench can lead to unsafe conditions
  • Tools with incorrect calibration must be marked as out of service and reported to management
  • Proper torque application requires following manufacturer specifications and using appropriate patterns (e.g., star pattern for bolt tightening)

Safety Wire:

  • Must be properly installed on all critical components
  • Improperly installed safety wire must be removed and reinstalled according to standard practices
  • Missing safety wire requires immediate notification of supervisor and rectification
  • Documentation of corrections is mandatory

4. Non-Destructive Testing (NDT)

NDT overview NDT/NDI Overview — Selection by Defect and Material Non-Destructive Testing — Chapter 4.2 | RAC 571, Standard 566, AC 43.13 NDT method Detected defect Suitable material Flux/Physical principle Limitation/Precaution VISUAL INSPECTION Defects: Corrosion, dents, surface cracks, wear, leaks, safety wiring All materials — direct inspection PENETRANT (PT) Capillary action Defects: Open surface cracks, porosity, lack of bonding Non-ferrous metals, ceramics ⚠ Clean and smooth surface required MAGNETIC PARTICLE (MPI) Defects: Surface and sub-surface cracks Steel and ferromagnetic alloys ⚠ Demagnetization mandatory after test ULTRASONIC (UT) Defects: Internal cracks, delaminations, porosity, thickness measurement Metals, composites, plastics ⚠ Coupling gel required RADIOGRAPHY (RT) Defects: Internal cracks, inclusions, porosity, internal corrosion Metals, assemblies EDDY CURRENT (ET) Defects: Surface cracks, corrosion, heat treatment Conductive materials NDT METHOD SELECTION — DECISION TREE Ferromagnetic material → MPI or ET | Non-ferrous → Penetrant or ET | Composite → Ultrasonic | Internal/inaccessible → Radiography or Ultrasonic Technician certification mandatory (Standard 566) — Any indication must be documented and reported to the supervisor Base method — first inspection level
Standard Practices — Tools and NDT Summary view of standard maintenance practices, documentation, measuring tools and non-destructive testing methods. Standard Practices — Tools and NDT Documentation • AMM / SRM / IPC • RAC 571 / 573 • Cartes de travail • Traçabilité Calibrated Tools • Torque wrench • Micromètre • Vernier caliper • Verified accuracy END / NDT • Visuel (VT) • Penetrant (PT) • Magnetic particle • Ultrasonic / ECT Decision • Defect found • Check limits • Repair per data • Maintenance release Goal: airworthiness proven by approved data, reliable measurements and suitable inspection.

Critical Considerations Before NDT:

NDT — Method Selection by Material and Defect NDT — selection of method according to material and defect RAC 571 · Standard 566 · AC 43.13 — Technician certification required before any NDT method 1. MATERIAL Aluminum (non-ferromagnetic) Steel / Alloy (ferromagnetic) Titanium (non-ferromagnetic) Composites (carbon, fiber) Plastics / Others (non-metallic) ⚠ ACCESSIBILITY Surface accessible from one side only → ultrasound required ✔ PREREQUISITE Technician certification for the method used 2. AVAILABLE NDT METHODS Method Detected defects Limits / Remarks Dye (penetrant) ● Cracks Surface cracks open to surface ✔ All materials Non-ferromagnetic OK ✘ Internal defects ✘ Porous surface Requires clean and dry surface Magnetic Particle ● Cracks Surface and sub-surface cracks ✘ Aluminum, titanium ✘ Composites ✔ Steel only (ferromagnetic) Demagnetization required after test Ultrasound ● Internal Internal defects (porosity, delamination, internal cracks) ✔ All materials ✔ Accessible one side only Couplant required (gel/water) Smooth surface required ✘ Rough surface Radio- graphy ● Internal Internal defects (porosity, inclusions, cracks) ✔ All materials ✘ Accessible 2 sides (source + film) ⚠ Radiation protection Controlled area 3. FINAL SELECTION SELECTION RULE 1. Identify the material 2. Define defect type 3. Check accessibility 4. Validate certification DECISION TREE Material? → Ferromagnetic? → Magnetic Particle → Non-ferromagnetic? → Dye Penetrant or Ultrasound DEFECT TYPE Open surface? → Dye Penetrant Internal / sub-surface? → Ultrasound / Radiography 📋 PROCEDURE MANUAL Any NDT method must follow the approved manual procedure The selection of the NDT method depends on the material, the type of defect sought, and accessibility — technician certification and the procedure manual are mandatory prerequisites
  • Technician must have required certification for the specific NDT method being used
  • Appropriate NDT method must be selected based on material type and defect characteristics
  • NDT procedure manual must be referenced to ensure compliance with regulatory standards

When Anomalies Are Found:

  • Document all findings immediately
  • Confirm indications with additional NDT methods if possible
  • Notify supervisor for proper assessment
  • Stop inspection if necessary to allow thorough evaluation
  • Follow up with further inspections as required

5. Defect Identification and Response

Defect management flow Anomaly and Defect Management — Maintenance Process 1. DISCOVERY Anomaly identified: corrosion, crack, dent, leak, wear 2. SAFEGUARDING Notify supervisor or competent authority Depressurize / isolate affected systems 3. DOCUMENTATION Record: date, time, technician name, description, location Logbook (CAR 605) 4. ASSESSMENT Consult AMM / AC 43.13 for approved procedures NDT if required (technician certification — Standard 566) Consult engineer if not covered Reference consultation 5. REPAIR / DEFER REPAIR Approved corrective action Cleaning, treatment, replacement, reinstallation DEFER If repair impossible: record in logbook, check MN 6. MAINTENANCE RELEASE Certifies the aircraft is fit for service (CAR 573) All logbook discrepancies are rectified Required independent inspections completed Authorized technician signature New anomaly detected → return to step 1 KEY REFERENCES CAR 571 — Maintenance CAR 573 — AMO CAR 605 — Logbook Standard 566 — Certification AC 43.13 — Practices KEY PRINCIPLES Immediate reporting Rigorous documentation Calibrated tools NDT by certified technician Full traceability CAR compliance

Corrosion:

  • Any corrosion found requires immediate reporting
  • For corrosion not covered by the repair manual, seek engineering guidance
  • Refer to maintenance manual for approved procedures (AC 43.13 guidelines)
  • Corrosion on fuel line fittings requires replacement with approved parts
  • Documentation of all corrosion findings and corrective actions is essential

Structural Damage:

  • Dents, cracks, or other damage must be documented and assessed against specifications
  • Notify supervisor for proper evaluation
  • Inspect for further damage to assess full extent of structural issues

Hydraulic System Issues:

Hydraulic Systems — Depressurize and Isolate Leaks Hydraulic Systems — Depressurization and Leak Isolation Standard 4-step procedure — RAC 571, AC 43.13 STEP 1 Depressurize the system before any inspection P 0 PSI 0 STEP 2 Isolate the system to identify the leak source CLOSED STEP 3 Pressure testing to locate the leaks 3000 PSI STEP 4 Stop and report STOP ⚠ LEAK DETECTED — Report immediately to the supervisor (RAC 571) Applicable regulations • RAC 571: Reporting and handling of any defect affecting airworthiness • AC 43.13-1B: Accepted methods for standard maintenance practices • Standard 566: Personnel certification and calibrated tools Technician mandatory actions 1 Depressurize the hydraulic system 2 Isolate the affected section 3 Perform the pressure test 4 Report any leak immediately Never ignore a leak
  • Depressurize system before inspection to ensure safety
  • Isolate system to identify leak sources
  • Perform pressure tests to locate leaks
  • Shut down system and report leaks immediately

Life-Limited Parts:

  • Must be monitored and replaced according to manufacturer specifications
  • Consult maintenance manual for specific requirements and limitations
  • Non-compliance can lead to in-flight failures

6. Maintenance Procedures and Best Practices

Before Signing Maintenance Release:

  • Verify all discrepancies in journey log are rectified
  • Ensure independent inspection has been completed
  • Confirm all documentation is accurate and complete

When Discrepancies Are Found:

  • Notify supervisor immediately
  • Document all findings
  • Consult maintenance manual or qualified engineer for clarification
  • Follow established repair procedures

Hazardous Material Disposal:

  • Follow established disposal procedures
  • Comply with safety and environmental regulations
  • Document disposal actions as required

Important Formulas, Regulations, and Procedures

Regulatory References Summary

Critical Procedures

Torque Application Procedure:

Torque Application — Star Pattern Procedure Torque Procedure — Star Pattern and Inspection STEP 1 Verify calibration Torque wrench Calibration required STEP 2 Select the value from the manual Consult AMM / AC 43.13 Target value STEP 3 Apply the torque smoothly STEP 4 Follow a star pattern Star Torque Pattern Multi-bolt assembly — tightening sequence 1 2 3 4 5 6 1→2 2→3 3→4 4→5 5→6 6→1 The star pattern distributes load evenly Post-Torque Inspection Verification of fastener integrity Torque reached compliant? YES ✓ Assembly correct NO ✗ Torque lower Actions required: • Inspect fastener • Check for damage • Check for deformation • Replace if necessary References: Standard 566, AC 43.13 — Calibrated tools mandatory TP14038E-STD — Chapter 2: Standard Practices, Documentation, Tools and NDT
  1. Verify torque wrench calibration
  2. Select appropriate torque value from manufacturer specifications
  3. Apply torque using proper pattern (star pattern for multiple fasteners)
  4. If torque reading is below specification, inspect fastener for damage first
  5. Document torque values as required

NDT Anomaly Response Procedure:

  1. Document findings immediately
  2. Confirm with additional NDT methods if possible
  3. Notify supervisor
  4. Stop inspection if necessary
  5. Follow up with further inspections as required

Maintenance Release Procedure:

  1. Verify all discrepancies rectified
  2. Ensure independent inspection completed
  3. Confirm documentation accuracy
  4. Sign release only after all requirements met
  5. If release issued incorrectly, notify supervisor to void

Common Relationships Between Concepts

Documentation and Airworthiness

The relationship between accurate documentation and aircraft airworthiness is fundamental. Incomplete journey logs, missing maintenance releases, or discrepancies between records and actual configuration directly affect the aircraft's legal status for operation. Proper documentation is not merely administrative—it is a safety-critical requirement.

Tool Calibration and Safety

Torque wrench calibration directly impacts the integrity of fastened components. Using an uncalibrated tool can lead to under-torqued or over-torqued fasteners, potentially causing component failure. The relationship between calibration accuracy and structural integrity is direct and critical.

NDT Certification and Inspection Quality

The requirement for technician certification in specific NDT methods ensures that inspections are performed correctly. Using the wrong method or an uncertified technician can result in missed defects, compromising safety. The relationship between certification, method selection, and inspection effectiveness is essential for reliable defect detection.

Defect Reporting and Regulatory Compliance

Any defect found during inspection must be reported and addressed according to regulatory standards. The relationship between finding a defect and taking appropriate action (reporting, consulting manual, notifying supervisor) is governed by CAR 571. Failure to follow this chain of actions can result in non-compliance and safety risks.

Maintenance Release and Independent Inspection

Independent inspection and maintenance release Independent Inspection and Release Critical task procedure — CAR 571 / 573 / 605 1. CRITICAL TASK IDENTIFIED • Task requiring mandatory independent verification • Examples: torque tightening, NDT inspections, safety systems • Reference: Standard 566, AC 43.13 2. INDEPENDENT INSPECTION • Performed by a 2nd qualified person • Verifies the technician's work • Confirms compliance with manuals • Requirement: CAR 573, para. 573.10 3. CORRECTION IF NECESSARY • Discrepancy found → corrective action • Consult the AMM or AC 43.13 • Repair / replace / adjust • Re-verify after correction New inspection if corrected 4. DOCUMENTATION • Logbook: description of the task and the inspection • Technical records: configuration • Requirement: CAR 605 5. SIGNATURE AND RELEASE • Signed by the technician and the independent inspector • Certifies the aircraft fit for service • Requirement: CAR 573, para. 573.11 6. RECORD ENTRY • Permanent entry in the aircraft technical log • Maintains full traceability • Requirement: CAR 605, Standard 566 PREREQUISITES FOR RELEASE (CAR 573) All tasks completed Independent inspections done Discrepancies rectified ADs complied with References: CAR 571 (maintenance), CAR 573 (AMO), CAR 605 (operations), Standard 566 (personnel), AC 43.13-1B (accepted practices) Process steps Correction loop Active control point

The requirement for independent inspection before signing a maintenance release ensures that work has been performed correctly. This relationship between verification and certification is a cornerstone of quality assurance in aircraft maintenance, preventing errors from going undetected.

Life-Limited Parts and Airworthiness

Life-limited parts must be replaced according to manufacturer specifications to maintain airworthiness. The relationship between part life limits and aircraft safety is absolute—exceeding these limits can lead to catastrophic failure. Monitoring and documentation of life-limited parts is therefore a critical maintenance function.

Diagram

Practice this chapter

Reinforce Standard Practices, Documentation, Tools & NDT with 150 Transport Canada–style practice questions, matched to your weak areas.

Try Free Practice QuestionsView Pricing