A Systems Approach to the Development of an Aircraft Smoke Control System
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1 A Systems Approach to the Development of an Aircraft Smoke Control System Danilo da Costa Ribeiro March 2016
2 Motivation 2
3 Motivation Technology Evolution Flight Control System Flight Envelope Protection Gain scheduling Improved Performance Less Weight ( ) Cable Technology 90s Flight Envelope Protection EMI/HIRF shielding Large bandwith Less Weight ( ) Fly By Wire Technology 2000s Flight By Light Technology 2
4 Motivation Technology Evolution Flight Control System Less Time to Market Flight By Light Technology 2
5 Motivation Safety often considered expensive Cost Parameters constraints 3
6 Motivation Safety often considered expensive Cost Parameters constraints 3 (Fleming, 2015)
7 Motivation Component Interaction Accidents Increasing with the systems complexity and integration Not covered by Component Failure Analysis 4
8 Motivation Traditional Assessment Failure oriented Assess many Interfaces at a later stage Experience plays a significant role STPA Function oriented Systemically assess Interfaces at an early stage Experience allied to a systemic process 5
9 Motivation Aircraft Requirements System Requirements Item Requirements Item Design Item Verification System Verification Aircraft Verification AFHA ASA PASA Aircraft CCA Aircraft CCA SFHA SSA PSSA System CCA System CCA System FMEA Allocation System FTA System CMA System FTA System CMA Integration System FMEA Software Design Hardware Design 6 (Adapted from ARP 4754A, 2010)
10 Motivation 6 (Adapted from ARP 4754A, 2010)
11 Complexity A complex system is a group or organization which is made up of many interacting parts (...) In such systems the individual parts called components or agents and the interactions between them often lead to largescale behaviors which are not easily predicted from a knowledge only of the behavior of the individual agents. Such collective effects are called emergent behaviors. 7 (Mitchell and Newman, 2002)
12 Complexity Systems Thinking and Safety Aircraft System 8
13 Smoke Control System Functions: Detect smoke on board Prevent smoke from entering an occupied zone Prevent fire on board 9
14 STPA: Accidents and Hazards Accidents A-1 A-2 A-3 Multiple fatalities Loss of aircraft Loss of mission Hazards Hazards Associated Accident H-1 Smoke inside the cabin A-1 H-2 Uncontrolled fire on board A-2 H-3 Unnecessary loss of relevant functions A-3 10
15 STPA: Level 0 Safety Constraints Safety Constraints to avoid Hazards L There shall never be smoke inside the cabin L There shall never be uncontrolled fire on board L No relevant function shall be lost when not required 11
16 STPA: Functional Control Structure External Inputs Subsystems 12
17 Electrical Procedure (02) Feedback (02) Smoke Procedure (02) Feedback (03) Smoke Procedure (01) STPA: Functional Control Structure Aircraft Manufacturer Procedures Airliner Society Feedback (05) Training / Imposistions Influences Electrical Procedure (01) Pilot Feedback (01) Electrical System Electrical Procedure (03) Feedback (06) Air Management System Passenger Cabin Feedback (04) E-BAYS 12
18 STPA: Step 01 Unsafe Control Actions According to Leveson, there are four ways for a control action to be hazardous: A safety required control action is not followed. An unsafe control action is provided. A safety required control action is provided too late or too early or out of sequence. A safety required control action is stopped too soon or applied too long. 13
19 Electrical Procedure (02) Feedback (02) Smoke Procedure (02) Feedback (03) Smoke Procedure (01) STPA: Step 01 Unsafe Control Actions (UCA) Aircraft Manufacturer Procedures Airliner Society Feedback (05) Training / Imposistions Influences Electrical Procedure (01) Pilot Feedback (01) Electrical Procedure (03) Electrical System Feedback (06) Air Management System Passenger Cabin Feedback (04) FWD E-BAY FWD E-BAY FWD E-BAY 14
20 STPA: Step 01 Unsafe Control Actions (UCA) Control action Safe control action Unsafe control not provided action provided Wrong timing/order Stopped too soon or applied too long Smoke procedure from the Pilot to Air Management System Smoke procedure not executed in case of smoke on board [UCA21] Smoke procedure executed when there is no smoke on board [UCA22] Smoke procedure Too soon: smoke procedure not fully executed in case executed too late of smoke on board [UCA24] [UCA23] Accidents Hazards Unsafe control actions A-1 Multiple fatalities H-1 Smoke inside the cabin 21;23;24 A-3 Loss of mission H-3 Unnecessary loss of relevant functions 22 15
21 STPA: Step 01 Safety Constraints Safety Constraints to avoid Unsafe Control Actions L1-04a: The pilot shall execute completely on time the smoke procedure to the AMS (UCA 21, 23 and 24) L1-05a: The pilot shall execute the smoke procedure only when there is smoke on board (UCA 22) ( ) 16
22 STPA: Step 02 Causal Factors Process Models 17
23 STPA: Step 02 Process Models Electrical System Process Model: Electrical Procedure -Procedure executed -Procedure not executed -Unknown Electrical Procedure Feedback -Procedure successful -Procedure unsuccessful -Unknown UCA-59: The electrical procedure affects the effectiveness of the smoke procedure, when it is performed at the AMS Actuator Electrical Procedure Air Management System Process Model: Electrical Procedure -Procedure executed -Procedure not executed -Unknown Electrical Procedure Feedback -Procedure successful -Procedure unsuccessful -Unknown Electrical Procedure Feedback Sensor 17
24 STPA: Step 02 Electrical System Process Model: Electrical Procedure -Procedure executed -Procedure not executed -Unknown Electrical Procedure Feedback -Procedure successful -Procedure unsuccessful -Unknown Actuator Electrical Procedure Electrical Procedure Feedback Sensor 18 Air Management System Process Model: Electrical Procedure -Procedure executed -Procedure not executed -Unknown Electrical Procedure Feedback -Procedure successful -Procedure unsuccessful -Unknown UCA-59: The electrical procedure affects the effectiveness of the smoke procedure, when it is performed at the AMS Scenarios Associated causal factors Safety Constraint Allocated to The electrical procedure was [Process Model Flaw: defined incorrectly and turn some The electrical procedure shall not affect the Aircraft Electrical / Air AMS components off, which smoke procedure efficiency (L2-42) manufacturer reduces the smoke procedure Management efficiency Systems]: The The electrical procedure is smoke procedure The electrical procedure shall not affect the Aircraft executed with an incorrect timing has its efficiency smoke procedure efficiency (L2-42) manufacturer and affect the smoke procedure reduced by the The communication between the The communication between the electrical and Aircraft electrical procedure electrical and air management air management systems shall be assured (L2- manufacturer systems is flawed 43)
25 Safety Constraints 03 Safety Constraints - Hazards 21 Safety Constraints - Unsafe Control Actions 43 Safety Constraints - Causal Factors Requirements Multi-disciplinary Team 19
26 Conclusion Generated Level 02 Safety Constraints Traditionally captured by requirements Traditionally captured in an advanced stage Captured only with STPA 20
27 Conclusion STPA. 23 Socio-technical safety constraints generated Traditional Hazard Analysis Does not address the sociotechnical aspect of system 13 Socio-technical safety constraints not addressed as a requirement by nowadays regulations Systemically generate requirements Some requirements were created after some accident An accident must occur to make flying safer? 21
28 Thank you!
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