Plaintiff assigns error to the trial court’s failure to instruct the jury on the doctrine of res ipsa loquitur after being requested to do so by plaintiff. As we stated in Millis Construction Co. v. Fairfield Sapphire Valley, 86 N.C. App. 506, 358 S.E. 2d 566 (1987), “It is the duty of the trial judge without any special requests to instruct the jury on the law as it applies to the substantive features of the case arising on the evidence.” The failure of a trial court to declare and explain the law with respect to a substantial feature of the case is prejudicial error and entitles an adversely affected party to a new trial. Mosely & Mosely Builders v. Landin Ltd., 87 N.C. App. 438, 361 S.E. 2d 608 (1987), pet. for cert. dismissed, 322 N.C. 607, 370 S.E. 2d 416 (1988).
In the present case plaintiff orally requested the trial court to give the jury an instruction on the doctrine of res ipsa loquitur along with an instruction on contentions of negligence. The trial court declined to give this instruction.
*779In Sharp v. Wyse, 317 N.C. 694, 346 S.E. 2d 485 (1986), Justice (later Chief Justice) Exum, writing for the Court, stated concerning the doctrine of res ipsa loquitur:
Res ipsa loquitur, in its distinctive sense, permits negligence to be inferred from the physical cause of an accident, without the aid of circumstances pointing to the responsible human cause. Where this rule applies, evidence of the physical cause or causes of the accident is sufficient to carry the case to the jury on the bare question of negligence.
Id. at 697, 346 S.E. 2d at 487 (quoting Kekelis v. Machine Works, 273 N.C. 439, 160 S.E. 2d 320 (1968)). The Court further stated:
The principle of res ipsa loquitur, as generally stated in our decisions, is this: When an instrumentality which caused an injury to plaintiff is shown to be under the control and operation of the defendant, and the accident is one which, in the ordinary course of events, does not happen if those who have the management of it use the proper care, the occurrence itself is some evidence that it arose from want of care.
The principle does not apply, inter alia, when more than one inference can be drawn from the evidence as to whose negligence caused the injury, ... or when the instrumentality causing the injury is not under the exclusive control or management of the defendant. . . .
Sharp at 697-698, 346 S.E. 2d at 488. (Citations omitted.)
The evidence presented in the present case tends to show that direct proof of the cause of plaintiff’s injury is not available; the instrumentality involved in the accident — the transom/window— was under the exclusive control of defendants; and the injury suffered by plaintiff is of a type that does not ordinarily occur in the absence of a negligent act or omission, i.e., plaintiff suffered an injury as a result of a falling transom/window. Therefore, the doctrine of res ipsa loquitur was a substantive issue in this case and the trial court should have given the requested instruction on this issue. Failure to do so is prejudicial error and entitles plaintiff to a new trial.
New trial.
Chief Judge HEDRICK and Judge ARNOLD concur.