Incident Overview
On May 5, 2011, at 16:20 UTC, a Saudi Arabian Airlines Boeing 747-300, registration HZ-AIR, equipped with Rolls-Royce RB211-524 engines, experienced an uncommanded increase to full power on the No. 4 engine. The event occurred as the flight crew began advancing the throttles to taxi for takeoff at Allama Iqbal International Airport (LHE) in Lahore, Pakistan.
Crew Response
The flight crew responded by placing the No. 4 engine's fuel switch to the cut-off position, which shut down the engine. The aircraft subsequently returned to the ramp without further incident.
Investigation
The investigation is being conducted by the General Authority of Civil Aviation of the Kingdom of Saudi Arabia. The National Transportation Safety Board (NTSB) has appointed an Accredited Representative to assist with the investigation under the provisions of ICAO Annex 13, as the state of manufacture and design of the airplane.