http://www.pilotsofamerica.com/forum/showpost.php?p=982835&postcount=12
New post to not derail another thread.
You could suppose that based upon student pilot status with zero mountain training alone...
But in seriousness...
Through beginning of August...lowest pressure I could find at L35 about midday was 30.15" Hg... this is factoring pressure altitude in your favor: assume runway elevation equals pressure altitude...round up to 7k' (more conservatism). Now let's assume an extreme factor of the hottest L35 temperature experienced in years...32 deg C. Round to 30 to make it easy in the POH for example sake...
Short field TO at 2300lb max gross is 3,245'. L35 runway is 5,580'. Check.
Move up to 9.5k' pressure altitude for safe entry clearance into BB valley from the west. At max gross...we run into trouble according to the POH. I wouldn't try it. By the POH, if temp was 68 deg F, at 10k pressure altitude, there is 230fpm climb available. If I was at max gross, if I absolutely had to, I'd go for it if temps were 68-70F. I know you can snake out of the west end at a little less than 9.5k' MSL.
So, down to only two passengers, probably something around 1900lbs gross... it looks like temps closer to 78+F and/or exceptionally low barometric pressure would cause potential concerns. But 78+F at BB happens only on the hottest of the hot days.
Now, again, I am a student pilot, endorsed to fly into L35. What I would check for is pressure altitude and temperature to determine adequate climb performance to enter/exit into BB Valley. The runway is adequate for pretty much all conditions to at least get off the ground. My initial statement was a quick drive-by thought...Incomplete for performance analysis to ensure safe BB Valley ingress and egress.
For sake of learning and safety, what else should I know? Something more specific than my need for mountain training...
http://www.pilotsofamerica.com/forum/showpost.php?p=982877&postcount=13
I thought of downdrafts, too... Would this be potentially more significant existing from the east side of the valley?
New post to not derail another thread.
Don't kid yourself. That's a very dangerous airport. At that altitude, a C172 with 2 people in it can be dicey climbing out. I don't mean to offend, but your statement alone indicates you need mountain flying training.
You could suppose that based upon student pilot status with zero mountain training alone...
But in seriousness...
Through beginning of August...lowest pressure I could find at L35 about midday was 30.15" Hg... this is factoring pressure altitude in your favor: assume runway elevation equals pressure altitude...round up to 7k' (more conservatism). Now let's assume an extreme factor of the hottest L35 temperature experienced in years...32 deg C. Round to 30 to make it easy in the POH for example sake...
Short field TO at 2300lb max gross is 3,245'. L35 runway is 5,580'. Check.
Move up to 9.5k' pressure altitude for safe entry clearance into BB valley from the west. At max gross...we run into trouble according to the POH. I wouldn't try it. By the POH, if temp was 68 deg F, at 10k pressure altitude, there is 230fpm climb available. If I was at max gross, if I absolutely had to, I'd go for it if temps were 68-70F. I know you can snake out of the west end at a little less than 9.5k' MSL.
So, down to only two passengers, probably something around 1900lbs gross... it looks like temps closer to 78+F and/or exceptionally low barometric pressure would cause potential concerns. But 78+F at BB happens only on the hottest of the hot days.
Now, again, I am a student pilot, endorsed to fly into L35. What I would check for is pressure altitude and temperature to determine adequate climb performance to enter/exit into BB Valley. The runway is adequate for pretty much all conditions to at least get off the ground. My initial statement was a quick drive-by thought...Incomplete for performance analysis to ensure safe BB Valley ingress and egress.
For sake of learning and safety, what else should I know? Something more specific than my need for mountain training...
http://www.pilotsofamerica.com/forum/showpost.php?p=982877&postcount=13
Amen. I took off from there in a fully loaded 172 last July, and if there had been significant downdrafts my goose would have been cooked. As it was, it was obvious after takeoff that I needed to follow the advice on the sign about where to do my climbout.
I thought of downdrafts, too... Would this be potentially more significant existing from the east side of the valley?
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