If no entry is made then the FMC assumes ISA value. According to the manual, you input the outside air temperature at the top of climb. what possible questions could they have after reading it? Instant understanding is essential. Hell, you might as well tell the teachers in schools and colleges to quit. Otherwise, you might as well ask the forum masters to shut down the forum if this is all the help you are going to be to those of us less fortunate in knowledge and understanding. If anyone else has something more helpful, insightful, or otherwise can give more than what I already have, thank you in advance. Reading the same thing over and over without understanding doesn't yield understanding. And before you do so, don't quote the damn manual. I thought the folks here on this forum were nicer, more understanding and helpful. What exactly is the point of this forum? To seek clarification, better understanding, and a deeper appreciation for what this hobby is all about. Second, I could have asked the PMDG folks, but they answer the same way you just did, like an ass, and they are the ones who have a forum for their own products. First, if you don't know the answer, don't post. All I asked for was some insight, if any was available. If I understood the manual in this posts question then the question wouldn't have to be asked, then would it. If I understood the manual on - THIS ONE POINT - I wouldn't have had to come to a forum for clarity. Wow, I expected a REAL response, not this.

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