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![]() Because you can never know too much about your plane's systems, you engage the alternate air one day while the static port is working fine and note the offset. Now you are ready with a known correction, when the time comes that the primary air is hosed. Is this a valid test? Only if engaging the alternate cuts off the primary. Because in that case, when you engage the alternate air, you now have the situation you tested (alternate air ONLY). If, OTOH, the perversities in the design are that the primary air is left connected, then you do not have a valid test. Consider the following scenario: You've done the test, and find that there is a 75 foot difference with alternate air. Then one day you are flying in the soup, you see a saucer shaped apparition, you are boarded by little green men who take the cowling off, reroute the engine exhaust into the static port plumbing, phone home, and vanish. Before looking for Area 54 in the AF/D, you notice the altimeter shows you underground. Ok, pull the alternate air. Now you're still underground, but with a 75 foot difference. You're still hosed because the hosed primary air is still part of the system. So, the alternate air had better cut off the primary air! If it does (as it should) then the test is valid and useful. Jose -- (for Email, make the obvious changes in my address) |
#2
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"Teacherjh" wrote in message
... Because you can never know too much about your plane's systems, you engage the alternate air one day while the static port is working fine and note the offset. Now you are ready with a known correction, when the time comes that the primary air is hosed. Is this a valid test? Only if engaging the alternate cuts off the primary.... (snip LGM scenario) So, the alternate air had better cut off the primary air! If it does (as it should) then the test is valid and useful. Does it, in your spam can? In mine? I probably have to go home and study the systems, but I admit I can't remember this detail in the POH. Or is there maybe some regulation behind your use of "should"? Inquiring minds want to know. -- David Brooks |
#3
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I know mine does not. It just opens the static line to the cockpit.
David Brooks wrote: Does it, in your spam can? In mine? I probably have to go home and study the systems, but I admit I can't remember this detail in the POH. Or is there maybe some regulation behind your use of "should"? Inquiring minds want to know. -- David Brooks -- --Ray Andraka, P.E. President, the Andraka Consulting Group, Inc. 401/884-7930 Fax 401/884-7950 http://www.andraka.com "They that give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, 1759 |
#4
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Does it [cut off the primary], in your spam can?
Dunno. Have to check. But it had better if it's to be of use. Or is there maybe some regulation behind your use of "should"? No. I am not from the FAA, nor do I play one on TV. ![]() Jose -- (for Email, make the obvious changes in my address) |
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