MDM Trouble Report for 2008 Feb 27

Telescope: 2.4m
Observer(s): John Thorstensen (Dartmouth)
Instrument: echelle direct

Problem(s) Encountered:
Three items, two are not new, one is very minor.

- Lost 10+ min to an episode of dome fugue.  One cure is to 
  turn off the yellow button -- the dome stops turning then --
  set the dome manually (imagine that), and turn the button
  on some time later.  There's a good chance the thing will
  have cleared by then.  Turning it off and on doesn't
  cure it, it just lets you observe while the thing goes
  through its little process.

- Had an asynchronous read error with the CCD that cost about
  20 min altogether.  This is an intermittent (and these days
  pretty rare) fault.

- When I turned on the LN2 flow with the 50-L OSU dewar, the
  hose exploded up near the fill tube.  Needs a new hose, 
  I guess.  Looked like an aneurysm.  

- No, make it four items!  I was typing this with the other
  50-L dewar sitting under the telescope after filling, waiting
  for its hose to thaw -- and I just heard a whooshing from 
  the dome -- the plug (with valves, etc) blew out of the 
  throat of the (other) 50 L dewar!  Good thing it was 
  cabled down, or it woulda probably whacked the instrument!  
  I left it sitting as it was -- with the bottle open the 
  pressure won't build.
 
  That's never happened to me before!

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Submitted on 2008 Feb 28 [7:11:45]