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Accident Sequences and Mitigation

Having constructed the failure effects, hazard, accident, and mitigation lists, it is then possible to bring all this information together to detail the accident sequences and mitigation list; see, for example, Table 19.17. Again, the use of suitable databases will help manage this process: in our work we typically have around 20 hazards, over 10 accident types, and more than 50 mitigations in place and so bringing these all together in the final sequences and mitigation list is a nontrivial task. Note that each hazard may lead to several accidents and that each haz- ard/accident combination may be subject to multiple mitigations when arriving at the Residual Risk. Also, if any of the Residual Risks is above a category C, further mitigation should be put in place unless this is completely impractical.

Table 19.17 Typical accident sequences and mitigation list (partial).

HZ-ID

Hazard

AC-ID

Accs.

Risk

Accident

sequence

MT-ID

Mits.

Res.

risk

HZ-03

Aircraft moving on ground

AC-02

Injury or death during landing

A

Aircraft overruns during takeoff or is not arrested during landing and continues on to impact personnel. For this accident sequence to occur, personnel must be in proximity to the moving aircraft in the over-run area

MT-P-06

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C

Likely

Major

It is considered highly unlikely that personnel would be present on the over-run area during landing. The probability of the accident sequence, given the probability of the hazard, is assessed as Seldom.

MT-P-07

Safe area

designated

for

personnel not directly involved in aircraft operation

HZ-04

Aircraft unsafe on ground

AC-03

Injury or death while aircraft is on the ground

B

The aircraft or propeller strikes personnel while not in flight. For this accident sequence to occur, personnel must be in proximity to the moving aircraft or spinning propeller. Their awareness of its location and condition (training, procedures) is a factor

MT-P-06

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C

Infrequent

Major

The nature of the injury will be also affected by a number of factors including the force of impact. The probability of the accident sequence, given the probability of the hazard, is assessed as unlikely

MT-P-07

Safe area

designated

for

personnel not directly involved in aircraft operation

 
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