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OV-105 via window W9, in OPF-1 on 3/13/00. Note that latch 3 has stripes on the striker plate while latch 4 does not. |
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Select picture to enlarge the latch area. |
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The Centerline Latch Extended Guide Roller Trajectory diagram is used when closing the starboard door only. The crew will check the trajectory of the extended guide roller (the long thin part with a wheel at the end) as it moves towards the port door and the striker plate and latch hanger mounted on the door. When the PLB Door switch is taken to Stop, there may be up to one second of motion afterwards, and the door will "bounce" once or twice before stopping all motion. It is on the first bounce that the crew should monitor where the extended guide roller is aiming, as this will be the farthest point in the door's motion before it damps out. The roller usually will tend to be aiming for the lower part of the hanger, between points A and B, but as long as the roller will be below point D, then the doors will close properly. If the roller looks like it will be above point D, the crew is No-Go to continue closing the doors; the concern is that there will be an overlap of the doors and they will not seal properly. If the crew is No-Go to continue, MCC will direct a attitude to thermally condition the payload bay doors in preparation for another attempt later. The numbers on the diagram represent the diameter of the roller wheel, used for reference.
Not every striker plate, however, has the stripes; on OV-105, for example, stripes are visible only for latches 3, 5, 7, 9, 11, 13, 15, and 16. Striker plates for latches 3 and 4 are shown below.
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OV-105 via window W9, in OPF-1 on 3/13/00. Note that latch 3 has stripes on the striker plate while latch 4 does not. |
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Select picture to enlarge the latch area. |
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created March - May 2000 / last updated March 2002