Expert evidence on the cause of the accident
38 The defendant served expert reports of Mr Simpson the principal of Simpson Associates Forensic Engineering dated 9 May 2000 and 2 September 2000 and Mr Ng of Testsafe Australia dated 1 September 1999. Mr Ng has a Bachelor in Engineering from the University of Malaya and is a Member of the Institute of Engineers of Australia. He is currently head of the mechanical unit of Testsafe Australia and has held this position for 18 years. The cross defendant did not rely upon any expert evidence. Both experts were cross examined.
39 Mr Simpson gave evidence that the most important factor that caused the accident was that an employee of McDonalds connected the cables that hold up the stage onto the wrong attachment point (t 167.58) combined with the operation of the winch, by an employee of McDonalds, in such a manner that the cables were pulled from the stage (t 168.15). The second most important cause of the accident was the lack of instruction manuals from the employer or the manufacturer but the employer had the primary responsibility. The third most important cause of the accident was failure to instruct the new driver of the truck in the correct method of setting up the stage. Mr Simpson stated that the positioning of the back eyelets, by the manufacturer, in such proximity to the correct attachment points so that it was possible to connect the cable to the eyelets was the fourth most proximate cause of the accident but linked to this event was the lack of a safety inspection by McDonalds. According to Mr Simpson such an inspection would have detected the possibility of such a mistake occurring but not necessarily that the eyelet had been used on previous occasions to attach the cables. The fifth most important cause of the accident was the positioning of the locking mechanism on the rear door so that in the event of the stage breaking free of the cables, the employee opening the doors would be underneath it and would have had no means of escape. Mr Simpson ranked the absence of any warning signs near the attachment points as the sixth and final cause of the accident.
40 Mr Ng gave evidence from the point of view that one of the fundamental rules of design is that human intervention must be minimised. According to Mr Ng the most important factor that caused the injury to Mr Bicer was the positioning of the latch so that its operation required the plaintiff to stand underneath the stage without a means of escape. The proximate causes are listed in descending order of importance. He stated that the next most important cause of the accident was the proximity of the black eyelets to the correct attachment points so that the cables could be connected to the wrong clip. The third and fourth causes are the lack of operating manuals from the employee and manufacturer respectively. According to Mr Ng the manuals should have indicated the need for periodic safety inspections of the truck by McDonalds. The absence of such inspections is rated as the fifth most important cause of the accident. The sixth most important cause was the absence of warning signs near the eyelets and attachment points.
41 Mr Ng then rates the failure to train the new truck driver in the set up of the stage as the seventh most important cause of the accident. It should be noted that Mr Ng does not consider the actual attachment of the cables to the wrong connection points nor the manner in which the winch was operated as being the causes of the accident. He regarded the training that should have been provided to the employee or employees who incorrectly detached the cable and then operated the winch in such a manner that the eyelets were weakened as the least important cause of the accident.
42 I prefer Mr Simpson's evidence to that of Mr Ng but have arrived at my own decision based on their evidence. It is my view that there were three negligent acts that materially contributed to the accident. The first and most important cause of the accident was that an employee of McDonalds connected the cables to the wrong attachment point such that the curtain rings could not hold the weight of the stage. The cables had been connected to the wrong attachment point on a number of prior occasions. The employer had not instructed and trained its employees on how to assemble and disassemble the stage. It was foreseeable that if the cables were connected to the curtain rings instead of the correct attachment point that the curtain rings would not be able to hold the weight of the stage by means of the cables and there was a real risk of injury to the plaintiff. The risk was not far fetched and fanciful. The employer is vicariously liable for the acts of its employees. The employer did not provide training for the plaintiff. A response to the risk would have been that the defendant provide proper instruction and training to assemble and disassemble the stage. A second cause of the accident was the location of the black eyelet attachment point in close proximity to the cable attachment point. To an untrained person, the eyelet and the attachment point looked similar because they were located very close to each other and could be mistaken for each other. It had crossed Ms Haddon-Wood's mind fleetingly that an untrained person could attach the cables to the wrong attachment point. The manufacturer was responsible for implementing the means of attachment of the side stage curtains to the stage. These modifications were not carried out in accordance with instructions provided by McDonalds.
43 Proximity exists between the defendant and cross defendant in respect of the use of the truck in the defendant's business either by itself or its employees. Proximity also exists between the cross defendant and plaintiff as an employee using the truck in the course of his employment. There is no absolute duty on a manufacturer to design or manufacture a defect free or accident proof product (Bull v Rover Motors (Aust) Pty Ltd [1984] 2 QdR 489 at 499). If a product is inherently extremely dangerous or the gravity of the risk of injuries is serious, a higher duty of care is to be exercised.
44 A manufacturer is required to take into account any possible use or mode of operation which may reasonably be foreseeable as involving a real risk. A manufacturer is not obliged to take precautions against a risk which may arise when the use to which the product is put is so unusual or improper as to make such a use wholly unforeseeable, it falls outside the range of any reasonable mans contemplation. (Voli v Inglewood Shire Council (1963) 110 CLR 74 per Dixon CJ at 79-80; Griffiths v Arch Engineering Co Ltd [1968] 3 All ER 217 at 221-222; Poole v Crittal Metal Windows [1964] NZLR 522 (CA) at 536; Waddams, Products Liability (2nd ed 1980, Carswell) at 49-51; Miller, Product Liability (1977, Butterworths) at 294-295; Newdick, The Future of Negligence in Product Liability (1987) 103 LQR 288). However, within the range of foreseeable risk manufacturer is required to take reasonable care in the design and manufacture of the product.
45 As was stated by Cooper J in Suosaari v Steinhardt (1989) 2 QdR 477 at 489 stated:
"In undertaking the process of design a manufacturer is under a duty 'to design his machine so as to keep its inherent dangers to a minimum and so as to avoid the addition of further risks which [are] not inherent' ( Todman v Victa Ltd [1982] VR 849 at 852 per Lush J and see to similar effect Murphy J at 857). Discharge of the duty requires the designer to think through the suitability of the design, the problems and risk associated with the design; the graver the foreseeable consequences of failure to take care, the greater the necessity for special circumspection. ( Independent Broadcasting Authority v EMI Electronics Ltd (1980) 14 BLR 9 (HL) at 28, 31; Winward v TVR Engineering [1986] BTLC 366 (CA). The standard to be applied when one is dealing with a machine is that of a reasonably competent engineer ( Winward at 5; Griffiths at 220-222). Where the risk is real, although the incidence of it may be low, the designer is under a duty to minimise the risk by taking all reasonable steps to eliminate it, particularly where the alteration to the design is simple and inexpensive."
46 It is not disputed that the requisite degree of proximity exists between a manufacturer and the user of the article produced because the user is so closely and directly affected by the act of designing and manufacturing an article that the manufacturer ought reasonably to have the user in contemplation as being affected when the manufacturer is directing his mind to the sufficiency of the design and manufacturing process, the safety of the product and the circumstances of distribution at the time when he places the product into circulation for use or consumption (see Donoghue v Stevenson [1932] AC 562 at 580, Jaensch v Coffey (1984) 155 CLR 549 at 579).
47 A reasonably competent engineer or even a person with the most rudimentary mechanical skills should have directed its mind to the danger of placing the curtain eyelet near the attachment point. It was an obvious danger and there was a cheaper and safer alternative, namely the press studs which had been implemented previously and were supposed to be repeated in the modification. A cheap and practical response which could have been taken to obviate the risk of the employee attaching the cable to the wrong attachment point was available. The cheap and practical alternative to the method of attaching the side curtains to the stage was the placing the button clips on the edge of the stage and on the curtains as had been done on the old truck. This is what McDonalds requested to be done.
48 A third negligent act which materially contributed to the accident was the positioning of the latch in the middle of the side door so that when a person was unlocking the stage door he or she was standing in a position directly underneath the stage door. If the cables did not hold the stage door firmly in the upright position when it descended that employee had no means of escape. Both the employer and the manufacturer were responsible for deciding on the position of the locking mechanism. It was a McDonalds employee who suggested the height of the mechanism. By that, the manufacturer was entitled to believe that McDonalds was otherwise satisfied with the locking mechanism but as the locking mechanism was drawn to its attention it did have a duty of care to ensure that it was safe for use.
49 It was foreseeable that there was a real risk of injury to the plaintiff if the cables were connected to the wrong attachment point the eyelets would not be able to hold the weight of the descending stage and would break causing the stage door to fall on the person unlocking the door and that person would have been put in a position whereby he or she was unable to escape. A cheap and practical response to the risk was to move the position of the locking mechanism from the middle of the outside of the stage or the side or sides of the stage of the truck instead of the middle. Both the manufacturer and the employer were negligent. As a result of the defendant and cross defendant's negligent acts, the plaintiff was seriously injured.