Linguistic Rating Terminology(Judgement of Influence) | Triangular Fuzzy Numbers(Numerical rating of factor’s influence) |
Very Low Influence | 0, 0, 0.25 |
Low Influence | 0, 0.25, 0.50 |
Medium | 0.25, 0.50, 0.75 |
High Influence | 0.50, 0.75, 1.00 |
Very High Influence | 0.75, 1.00, 1.00 |
Concepts | Causal Factors (Independent Variables) | LC | AR | MK | TH | AH | RM | SP | JS | Ranking |
C1 | Insufficient Training/ Lack of Concurrency | 0.75 | 0.75 | 0.75 | 0.75 | 1.00 | 1.00 | 1.00 | 0.75 | 0.84 |
C2 | Unskilled Pilot (Not rated for Aircraft Type for instance) | 0.75 | 1.00 | 0.75 | 0.75 | 0.75 | 1.00 | 1.00 | 0.50 | 0.81 |
C3 | Fatigue/Tiredness | 0.50 | 0.75 | 0.50 | 1.00 | 1.00 | 1.00 | 0.75 | 0.75 | 0.78 |
C4 | Faulty/Uncalibrated Instrument Readings | 1.00 | 0.75 | 0.75 | 1.00 | 1.00 | 1.00 | 0.25 | 0.25 | 0.75 |
C5 | Appraisal of Evolving Situation | 0.75 | 1.00 | 0.75 | 1.00 | 1.00 | 0.50 | 0.50 | 0.50 | 0.75 |
C6 | Medication/Drugs | 1.00 | 0.75 | 0.50 | 0.25 | 1.00 | 1.00 | 0.50 | 1.00 | 0.75 |
C7 | Communication (ATC) | 1.00 | 0.75 | 1.00 | 0.50 | 1.00 | 0.50 | 0.25 | 0.25 | 0.66 |
C8 | Stress | 0.50 | 0.75 | 0.75 | 0.50 | 0.75 | 0.75 | 0.75 | 0.50 | 0.66 |
C9 | Availability of Visual References | 0.75 | 0.75 | 0.50 | 0.75 | 0.75 | 0.75 | 0.25 | 0.50 | 0.63 |
C10 | Preparation (Flight/Route Planning, Pre-Flight checks etc) | 1.00 | 0.25 | 0.50 | 1.00 | 1.00 | 0.25 | 0.25 | 0.25 | 0.56 |
C11 | Resource Awareness/Crew Resource Management (CRM) | 0.25 | 0.50 | 0.25 | 0.75 | 1.00 | 0.75 | 0.25 | 0.75 | 0.56 |
C12 | Lack of ADM knowledge (Perceive – Process – Perform) | 0.25 | 0.50 | 0.25 | 0.50 | 1.00 | 0.50 | 0.75 | 0.75 | 0.56 |
C13 | Distractions (Phone Call, In Flight Conversations) | 0.75 | 0.50 | 0.5 | 0.25 | 1.00 | 0.50 | 0.5 | 0.25 | 0.53 |
C14 | Cockpit Ergonomics/Information Layout | 0.50 | 0.50 | 0.25 | 0.75 | 1.00 | 0.25 | 0.25 | 0.75 | 0.53 |
C15 | Time Pressures | 0.50 | 0.50 | 0.25 | 0.25 | 1.00 | 0.50 | 0.50 | 0.75 | 0.53 |
C16 | Lack of Assertiveness | 0.50 | 0.75 | 0.25 | 0.25 | 1.00 | 0.50 | 0.25 | 0.25 | 0.47 |
C17 | Complacency (Route Familiarity) | 0.75 | 0.50 | 0.00 | 0.25 | 1.00 | 0.50 | 0.25 | 0.00 | 0.41 |
C18 | Norms | 0.25 | 0.50 | 0.25 | 0.25 | 1.00 | 0.25 | 0.25 | 0.50 | 0.41 |
C19 | Part 91 Rules (Less Stringent Rules) | 0.50 | 0.00 | 0.25 | 0.00 | 0.50 | 0.25 | 0.50 | 0.00 | 0.25 |
Expert Initial | Occupation |
LC | Chief Engineer (Aerospace Safety Systems) |
AR | Aerospace Design Engineer |
MK | Aerospace Design Engineer |
TH | Aerospace Manufacturing Engineer |
AH | Ex-CAA Safety Expert |
RM_PPL1 | Aerospace Engineer & GA Pilot |
SP_PPL2 | Aerospace Engineer & GA Pilot |
JS_PPL3 | Aerospace Engineer & GA Pilot |
HFACS CONCEPT GROUPINGS FOR FCM Concepts of Acts & Omissions | Concept Description | Rating |
C6 | Medication/Drugs | 0.75 |
C10 | Preparation (Pre-Flight Checks) | 0.56 |
C11 | Awareness (CRM) | 0.56 |
C16 | Lack of Assertiveness | 0.47 |
C17 | Complacency | 0.41 |
Concepts of Preconditions & Local Factors | Concept Descriptions | Rating |
C2 | Unskilled Pilot | 0.81 |
C4 | Faulty/Uncalibrated Instruments | 0.75 |
C9 | Visual References | 0.63 |
C15 | Time Pressures | 0.53 |
C14 | Cockpit Ergonomics (Information Layout) | 0.53 |
C13 | Distraction (Inflight) | 0.53 |
Concepts of Supervision & Local Management | Concept Descriptions | Rating |
C5 | Poor Situation Appraisal | 0.75 |
C7 | Poor Communication (ATC) | 0.66 |
C12 | Lack of ADM Knowledge/Training | 0.56 |
Concepts of Organisational Influences | Concept Descriptions | Rating |
C1 | Insufficient Training | 0.84 |
C3 | Fatigue/Tiredness | 0.78 |
C8 | Stress | 0.66 |
C18 | Norms (Familiarity) | 0.41 |
C19 | Part 91 Rules | 0.25 |
Initial Concept Mapping | Description |
1 ßà 12 | Insufficient Training -- Lack of ADM |
1 ßà 5 | Insufficient Training -- Poor Situation Appraisal |
1 ßà2 | Insufficient Training -- Unskilled Pilot |
6 ßà5 | Medication/Drugs -- Poor Situation Appraisal |
6 ßà7 | Medication/Drugs -- Poor Communication (ATC) |
6 ßà16 | Medication/Drugs -- Lack of Assertiveness |
2 ßà10 | Unskilled Pilot -- Poor Preparation (Pre-Flight Checks) |
2 ßà16 | Unskilled Pilot -- Lack of Assertiveness |
2 ßà11 | Unskilled Pilot -- CRM Awareness |
2 ßà5 | Unskilled Pilot Poor Situation Appraisal |
5 ßà 16 | Poor Situation Appraisal -- Lack of Assertiveness |
15 ßà 8 | Time Pressures -- Stress |
9 ßà 5 | Visual References -- Poor Situation Appraisal |
4 ßà12 | Faulty/Uncalibrated Instruments -- Lack of ADM |
13 ßà 7 | Distractions -- Poor Communication |
3 ßà5 | Fatigue/Tiredness -- Poor Situation Appraisal |
14 ßà5 | Cockpit Ergonomics -- Poor Situation Appraisal |
14 ßà7 | Cockpit Ergonomics -- Poor Communication |