11.   A fifth test that had been scheduled for October was postponed because of mechanical difficulties.

12.   An Alaska Airlines jet en route to San Francisco from Mexico crashed Monday in the Pacific Ocean after reporting mechanical difficulties.

13.   It helped make up for a season marred by mechanical difficulties and tactical errors.

14.   Mechanical difficulty was being investigated as a possible cause.

15.   Other military helicopters have made forced landings in South Armagh in recent months because of mechanical difficulties.

16.   However, minutes after takeoff the crew reported mechanical difficulties and decided to return to Lima, then lost contact with the air traffic controllers.

17.   At one point in the qualifying laps, Schumacher managed to secure a best lap time, despite driving the spare Ferrari after his usual machine developed mechanical difficulties.

18.   Turkish authorities located the vessel overnight off the southern coast of Crete, suffering from mechanical difficulties and making slow progress.

19.   Shortly before, the Courage-Porsche had been the victim of yet another mechanical difficulty when it lost its front left wheel.

20.   The boat had suffered mechanical difficulties and was making slow progress.