All of a suddenly the alarms ring out, as from the cockpit indication
system aural as well as visual warnings call for immediate attention. In an
instant the captain and copilot have reacted and read the signs, engine number threes
oil pressure is much too low.
The captain checks the emergency procedures for a low oil pressure
indication.
Accordingly they have to retard engine number threes thrust lever and then they
have to wait for about two minutes before they can actually shut the engine down.
Meanwhile the crew contacts the air-traffic control tower to inform them of
the situation.
They are fully aware that they cannot continue the flight on three
engines, and decide to return.
The captain informs the on-board flight attendants and the passengers
about the situation, though concerned, everybody is of course disappointed
about having to turn back.
Because the aircraft has not made the long journey its laden weight is
now well above the safe landing limit, the crew must take the decision to dump
approximately 100,000 kg of fuel, and this they must do over a particular area
above the sea.
After dumping its fuel the aircraft is set on a course back to the airport, the crew in the
mean-time reassure the passengers and prepare to land.
They remain wary of the fact that having an engine down also has
consequences when trying to land the airplane. The loss of one reverse system means that either a
much longer runway is necessary or the brakes must be applied in a manner
that would overload the braking system, resulting
in damaged tires which in turn could cause an accident.
After all is said and done the landing went very well, the ground teams
had been informed of the approaching situation, and were
prepared for her arrival.
When flight CCM 908 finally arrived back, the
disappointed passengers were checked into hotels nearby to await the next
available flight, which was not until the following day.
The captain and his crew, who were over their slotting time, went
home.
And the aircraft was subsequently taken over by the maintenance engineers,
who had to conduct a thorough investigation as to the cause of the whole
problem.