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Thread Tools | Display Modes |
#1
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Attitude Indicator
Every time I get in the aircraft and before I start the engine I notice
the attitude indicator is displaying a nose down and a left turn. Why is that? Is there something wrong with the instrument and is near failure? KP |
#2
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Attitude Indicator
Your only concern should be whether or not it erects properly within a
decent interval...by the time you are taxiing, for example. When the vacuum pump stops providing the force necessary to spin the gyro it is going to come to rest in some unpredictable way. Next time you shut the engine off, however, don't leave the cockpit for a few moments, and listen to the gyros as they spin down...if there is any kind of mechanical problem, you will hear it. Bob Gardner "KP" wrote in message oups.com... Every time I get in the aircraft and before I start the engine I notice the attitude indicator is displaying a nose down and a left turn. Why is that? Is there something wrong with the instrument and is near failure? KP |
#3
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Attitude Indicator
KP wrote: Every time I get in the aircraft and before I start the engine I notice the attitude indicator is displaying a nose down and a left turn. Why is that? Is there something wrong with the instrument and is near failure? KP It is a gyroscopic instrument powered by vacuum or electric. When there is no power, it is not going to work. |
#4
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Attitude Indicator
Every time I get in the aircraft and before I start the engine I notice the attitude indicator is displaying a nose down and a left turn. You just described the expected behavior. Why is this surprising to you? Are you expecting the AI to jump to level when you turn the master on? -harry |
#5
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Attitude Indicator
It is weighted slightly off center to make up for the coriolis
acceleration due the rotation of the earth. The weight makes it precess as required to appear to be level. And the erection mechanism is as others have pointed out... takes the average downward vector and calls that level. Bill Hale wrote: Every time I get in the aircraft and before I start the engine I notice the attitude indicator is displaying a nose down and a left turn. You just described the expected behavior. Why is this surprising to you? Are you expecting the AI to jump to level when you turn the master on? -harry |
#6
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Attitude Indicator
KP writes the AI's orientation is predictable, ie nose down and left
turn. Bob, should we really expect an unpredictable way, as you write? Stan On Thu, 5 Oct 2006 14:50:47 -0700, "Bob Gardner" wrote: When the vacuum pump stops providing the force necessary to spin the gyro it is going to come to rest in some unpredictable way. Bob Gardner "KP" wrote in message roups.com... Every time I get in the aircraft and before I start the engine I notice the attitude indicator is displaying a nose down and a left turn. KP |
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