(3) Matters which must be pleaded pursuant to subrule (2) include (but are not limited to) fraud, performance, release, statute of limitation, extinction of right or title, voluntary assumption of risk, causation of accident by unknown and undiscoverable mechanical defect and facts showing illegality."
21 The purpose of Rule 14 is to ensure the efficient disposition of litigation and avoidance of "trial by ambush." In so far as the obligations which the Rule imposes on a defendant are concerned its purpose is to ensure that if there is an answer to the plaintiff's claim which depends upon some positive assertion of fact, some special claim or a claim that the case is bad in law, adequate notice is given to the plaintiff: Kirby v Sanderson Motors Pty Ltd (2001) 54 NSWLR 135; Bright v Sampson & Duncan Enterprise Pty Ltd (1985) 1 NSWLR 346.
22 However, although it imposes obligations which if not complied with may result in a defendant being precluded from pursuing a particular defence, requiring an adjournment to be granted to the plaintiff or the defendant visited with costs orders, it does not relieve a plaintiff from the obligation to prove its case. In that respect the common law and any relevant statutory provision define the liability of a defendant and the manner of its proof.
23 The circumstances of the present case did not impose an obligation on the respondent to plead in relation to prospective mechanical failure. The respondent did not submit that the accident was explained by mechanical failure. Rather it submitted that unless the appellant could demonstrate that a reasonable possible cause for which the respondent was not responsible, including mechanical failure, had not caused the accident, the appellant could not succeed. He would have failed to prove on the balance of probabilities that the respondent's negligence was responsible for the accident.
24 Fundamental to the appellant's submission is that a tray being lifted by a crane would not normally fall and injure a person without the negligence of the operator. It was submitted that Mr Mai must have pushed a wrong button causing the tray to fall and the principle of res ipsa loquitur applied, with the consequence that the burden fell upon the respondent to prove that the accident occurred without its negligence.
25 It is important to appreciate that the principle known as res ipsa loquitur is descriptive of a process of reasoning by which a prima facie case of negligence can be made out. If an occurrence which has caused injury is of a kind that within the common knowledge and experience of people would not ordinarily occur without negligence proof that the event occurred may be sufficient to raise a prima facie case calling for explanation by the defendant. The principles were recently restated in Schellenberg v Tunnell Holdings Pty Limited (2000) 200 CLR 121. If, however, the cause of the occurrence can be identified or the occurrence is not one within the experience of the ordinary person the principle can have no application.
26 To my mind the principle has no application to the present case. Although the ordinary person well appreciates that a load being lifted by a crane should not fall onto a person's foot the cause of the event is a matter about which the ordinary person would have little if any understanding. There may be, as the trial judge identified, many reasons why such an event occurs without negligence of the operator. Without any evidence which could allow those other possible explanations to be put aside it is not possible to infer that it was a negligent act of the respondent for which it was liable, which caused the accident.
27 The appellant's contention is that by reason of the agreement between the parties the approach which his Honour took to the matter was not open. Because it had been agreed that the respondent would not attempt to allege mechanical fault it was submitted that the only conclusion available to his Honour in the circumstances was said to be that the tray fell because of the negligence of the operator.
28 I cannot accept this submission. The exchange between the lawyers, reflected in the request for particulars and the answers, was confined to the circumstance where the respondent attempted to allege mechanical fault. Such a pleading was not made and the submission of the respondent was confined to alleging that because the appellant was unable to exclude mechanical failure as a reason for the accident the inference that the accident would not have occurred but for the negligence of the respondent was not available. In my opinion his Honour was correct to accept this submission. The appellant was always required to prove his case.
29 As I have indicated Mr Mai did not give evidence at the trial. He was, like the appellant, employed through a labour hire company and had ceased working with the respondent by the time of the trial. Evidence was given at the trial that the respondent's solicitor had made efforts, which were not successful, to locate him. Although the solicitor was cross-examined the appellant did not suggest that Mr Mai could be found and presented no evidence which would suggest this was the case. In these circumstances the inference discussed in Jones v Dunkel (1958) 101 CLR 298 was not available.
30 In my opinion the appropriate orders are: