Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucselx!crash!pro-canaveral.cts.com!gandalf
From: gandalf@pro-canaveral.cts.com (Ken Hollis)
Newsgroups: sci.space.shuttle
Subject: Payload Bay Doors...
Message-ID: <5666@crash.cts.com>
Date: 15 Nov 90 10:36:12 GMT
Sender: root@crash.cts.com
Lines: 27

Grettings and Salutations:

>From: rogers@venera.isi.edu
     .
     .
     .
>door operation.  You mentioned that the design provides for single
>motor failures, althought not double motor failures.  I was wondering
>if you might post to the net a summary of the failures, if any, that
>have actually occured in this phase of Shuttle operation.  Thanks.

>                                Craig Milo Rogers

There have been no motor failures either in orbit or during normal flow
processing.  A "Flow" is the work required to check out the vehicle for the
next flight and reconfigure it to the next payload.  There have been some
(expected) microswitch failures, but there is a torque limiter device in the
motor driver to keep the motor from driving the mechinism too far.

There also is included in the astronauts crew kit a wrench for closing the
doors manually requiring an EVA.

Ken Hollis

ProLine:  gandalf@pro-canaveral         
Internet: gandalf@pro-canaveral.cts.com
UUCP:     crash!pro-canaveral!gandalf