C1, C2, C3, FI and Unsafe Situations
Classify periodic observations by evidenced danger, potential danger, improvement or need for further investigation.
Prepare from agreed scope to defensible handover
Start with route and purpose, control safety and source edition, gather inspection evidence, test methodically and complete the correct certificate or condition report.
Core concepts
Concept 1
Classify periodic observations by evidenced danger, potential danger, improvement or need for further investigation.
Exam cue: Write the factual observation, identify the hazard and consequence, choose the proportionate classification and communicate urgent action.
Concept 2
C1 denotes danger present, C2 potential danger, C3 improvement recommended and FI further investigation required without delay.
Exam cue: State whether the decision belongs to initial verification, periodic inspection or both before applying it.
Concept 3
The overall report outcome follows the observations and current reporting rules, not a negotiated preference.
Concept 4
An FI code is not a substitute for an inspection or test that could reasonably have been completed within the agreed extent.
Targeted study blocks
Purpose
Know what the evidence must establish
Classify periodic observations by evidenced danger, potential danger, improvement or need for further investigation.
Method
Use a safe repeatable sequence
Write the factual observation, identify the hazard and consequence, choose the proportionate classification and communicate urgent action.
Boundary
Keep route and practical limits visible
An FI code is not a substitute for an inspection or test that could reasonably have been completed within the agreed extent. Do not code solely from a regulation number, installation age or personal preference without a safety-based observation.
Risk pitfalls and guardrails
Do not code solely from a regulation number, installation age or personal preference without a safety-based observation.
Guardrail: Confirm the current source and stop when evidence, competence or task authority is insufficient.
Do not substitute a memorised sequence or displayed value for safe evidence and professional judgement.
Guardrail: Confirm the current source and stop when evidence, competence or task authority is insufficient.
Memory anchors
C1, C2, C3, FI and Unsafe Situations: purpose
Classify periodic observations by evidenced danger, potential danger, improvement or need for further investigation.
C1, C2, C3, FI and Unsafe Situations: method
Write the factual observation, identify the hazard and consequence, choose the proportionate classification and communicate urgent action.
C1, C2, C3, FI and Unsafe Situations: key fact 1
C1 denotes danger present, C2 potential danger, C3 improvement recommended and FI further investigation required without delay.
C1, C2, C3, FI and Unsafe Situations: key fact 2
The overall report outcome follows the observations and current reporting rules, not a negotiated preference.
C1, C2, C3, FI and Unsafe Situations: boundary
An FI code is not a substitute for an inspection or test that could reasonably have been completed within the agreed extent.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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