|Quoting DC8FriendShip (Reply 13):|
If you recall the American airlines DC-10 that crashed in ORD in the late '70's the loss of the engine did not cause an out of balance condition. that aircraft flew until the speed was reduced to V2, and the left wing, with slats retracted due to the loss of hydraulics, stalled and the right wing, engine still attached, lifted and careened the aircraft onto its side and into the ground.
The loss of the engine was due to the prodecure of removing/installing the engine/plyon as a one piece unit by the use of the forklift. This prodecure data was approved by the FAA.
The old engine/plyon was removed and the plyon was installed on the new engine. Then it was put up by forklift into the plane, only the front mounting bolt was installed then the techs went on a lunch break.
During the lunch break, the forklift seals slowly leaked letting hyd oil out of the lifting actuators, the front of the engine was partically hanging now while the back was driven up even further due to the engine's weight. The engine is heavy in the front with the plyon attached to it.
When they returned, they just adjusted the forklift and installed the rear bolt.
The damage already has been done without the rear bolt installed, the area near the very back of the plyon already stressed the wing mounting area.
So when it was ready for takeoff on that day, the rear structure gave out, released the rear plyon attachment and the engine under full power continued to pull and pivoted around the front attachment which then it broke off and flew over the wing taking the hyd lines out with it too.
Hyd fuses wasn't avail in this area at that time, if it was, the loss of hyd fluid would have been limited.
In return, the slats retracted causing the stall speed to be higher on that wing, it banked to the left due to the higher lift on the right wing and crashed.
In the investigation, CO, DL, UA were doing engine changes the same was AA did on that DC-10. After that crash, the prodecure was stopped and it had to go by the way the manual said which to remove the engine THEN the plyon. Not as a one piece unit anymore which they did to save time.
There is a excellent documentary DVD on this, it's from A&E, title is "The crash of flight 191"
[Edited 2005-09-02 20:25:09]