January 5, 2007

As a military equipment customer, we allow our OEM'S to submit for our approval, an Alternate Parts Drawing (APD).  This is an A size drawing.  The APD does a number of things for us.  It allows folks to substitute better than parts; it allows use of specific alternate parts; it deals with DoD changes to specifications such as MIL-DTL vice MIL-PRF vice A-A prefix drawings, etc.  It also deals with using different vendor process documents.  For example, if a drawing states to weld per vendor procedure ABC and if the product is subsequently sub-contracted to another vendor who uses procedure DEF, the APD allows procedure DEF as an alternative to procedure ABC.  This is based on our review of procedure DEF.

One of the big advantages of this APD concept is that we save $ by avoiding the cost of revising hundreds of assembly drawings just to deal with part number substitutions.  Once we approve a vendor specific APD, the vendor does not need to revise any assembly drawing until such time that the drawing is being revised for other reasons.  At that time, the vendor then rolls in the change to the P/N to incorporate the information from the APD.  The vendors also use the APD during receiving inspection to allow acceptance of the alternate parts.
  ----- Original Message ----- 
  From: ekalgren<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Friday, January 05, 2007 12:40 PM
  Subject: [TN] Resistor Substitutions


  Good afternoon everyone.  I hope your new year is going well so far.  I just
  got off the phone with our folks in purchasing who were telling me that
  there was a 13 week lead time for a resistor.  I checked a few places
  on-line and was able to find a better (in terms of failure rate) resistor in
  stock.  

   

  My question is does anybody working with mil spec components have a blanket
  substitution policy along the lines of "S or T failure rates can be used in
  place of R failure rates without engineering approval" or do you require
  approval for every sub?

   

  Eric Kalgren

  Electrical Engineer

  Cobham Defense Electronic Systems 
  Continental Microwave Division 
  11 Continental Drive 
  Exeter, NH  03833  USA
  Tel:  603-775-5200  
  Fax: 603-775-5201 
  E-mail:[log in to unmask]  
  Website:   <http://www.cobhamdes.com/<http://www.cobhamdes.com/>> http://www.cobhamdes.com<http://www.cobhamdes.com/>

   <mailto:[log in to unmask]<mailto:[log in to unmask]>>  

   


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