I think that is quite possible. I also think what Lycoming has in mind is
     if you are at cruising altitude and you are leaned 100 degrees LOP when
     you descend and forget to richen [lean] the mixture the engine will go to peak
     EGT and burn the valves or ruin the head. One must always think out of the
     box and take every possible scenario into consideration. We as engineers
     still screw up because there is always someone out there that will do
     something you never expected them to do knowing what you know. In other
     words the correct operations  you take for granted.

Paul,
 A request for clarification here. IF you are operation lean of peak already and decend from altitude doesn't the engine just get leaner and possibly stop? I would think that decending from altitude
when RICH of peak would be more dangerous, as you would probably end up right in that hot range?
Bill Jepson

Yes see my previous message. I fixed that problem above.

Scenario: Pilot forgets to change the mixture.
 
Start Operation. Power ...... Fuel   Air...... Mixture .. EGT  
---------------------------------------------------------------    
LOP ..climb .... Reducing ....Same   decreasing  leaner   lower     
LOP ..descend .. Increasing ..Same   increasing  richer   higher       
  
ROP ..climb .... Reducing ....Same   decreasing  leaner   maybe the same due to reduced power. 
ROP ..descend .. increasing ..Same   increasing  Richer   lower  

The combination of increased power with richer mixture and higher EGT 
while descending is the valve killer while operating lean of peak. 

Paul Lamar
 
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