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What could cause lower torque than normal during cruise in a King Air 300?
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What could cause lower torque than normal during cruise in a King Air 300?
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At approx FL200 in our King Air 300 we experience a vibration and notice the torque drop for both engines. The torque stays about 10% lower than normal in cruise. The vibration is intermittent and doesn’t seem to occur in the descent. All other instruments indicate normal readings including oil pressure, temps, and fuel flow. What might be the possible causes?
turboprop vibration
edited 7 hours ago
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At approx FL200 in our King Air 300 we experience a vibration and notice the torque drop for both engines. The torque stays about 10% lower than normal in cruise. The vibration is intermittent and doesn’t seem to occur in the descent. All other instruments indicate normal readings including oil pressure, temps, and fuel flow. What might be the possible causes?
turboprop vibration
edited 7 hours ago
Bianfable
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asked 8 hours ago
user44149user44149
161 bronze badge
New contributor
user44149 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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At approx FL200 in our King Air 300 we experience a vibration and notice the torque drop for both engines. The torque stays about 10% lower than normal in cruise. The vibration is intermittent and doesn’t seem to occur in the descent. All other instruments indicate normal readings including oil pressure, temps, and fuel flow. What might be the possible causes?
turboprop vibration
edited 7 hours ago
Bianfable
6,46024 silver badges51 bronze badges
asked 8 hours ago
user44149user44149
161 bronze badge
New contributor
user44149 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
At approx FL200 in our King Air 300 we experience a vibration and notice the torque drop for both engines. The torque stays about 10% lower than normal in cruise. The vibration is intermittent and doesn’t seem to occur in the descent. All other instruments indicate normal readings including oil pressure, temps, and fuel flow. What might be the possible causes?
turboprop vibration
turboprop vibration
edited 7 hours ago
Bianfable
6,46024 silver badges51 bronze badges
asked 8 hours ago
user44149user44149
161 bronze badge
New contributor
user44149 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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edited 7 hours ago
Bianfable
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asked 8 hours ago
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edited 7 hours ago
Bianfable
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edited 7 hours ago
Bianfable
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edited 7 hours ago
Bianfable
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asked 8 hours ago
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asked 8 hours ago
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161 bronze badge
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2 Answers
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My guess, and it's just a wild guess, is humidity based ice forming somewhere in the inlet and/or the inlet plenum, more or less similar to carburetor icing. The symmetrical torque drop is from the flow restriction and the random vibration is when the ice breaks up. I'll guess that you were flying though what appeared to be clear or clearish air with the inlet/plenum anti-ice turned off.
Double simultaneous random mechanical malfunctions are just too microscopic from a probability perspective to be likely at all. A phenomenon like that, that happens to both engines at the same time, must be due to an external source related to the atmosphere the aircraft is flying through, unless there is some other system on board that impacts both engines equally if it malfunctions, and that's something you won't generally see design wise.
I would try this question on PPrune Forums. Somewhere there is a King Air or Twin Otter driver that's had the same experience.
answered 8 hours ago
John KJohn K
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Thank you! I’ve posted the question on the site you mentioned as well.
answered 7 hours ago
AV8trixAV8trix
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Does this mean you are the same person as @user44149? The you should have commented on the answer you are refering to.
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– PerlDuck
6 hours ago
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Yes, registered after I asked the question :)
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– AV8trix
6 hours ago
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I see. You can join the two accounts, see the help center: aviation.stackexchange.com/help/merging-accounts
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– PerlDuck
6 hours ago
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Done, thank you
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– AV8trix
6 hours ago
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Please don't add "thank you" as an answer. Once you have sufficient reputation, you will be able to vote up questions and answers that you found helpful. - From Review
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2 Answers
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$begingroup$
My guess, and it's just a wild guess, is humidity based ice forming somewhere in the inlet and/or the inlet plenum, more or less similar to carburetor icing. The symmetrical torque drop is from the flow restriction and the random vibration is when the ice breaks up. I'll guess that you were flying though what appeared to be clear or clearish air with the inlet/plenum anti-ice turned off.
Double simultaneous random mechanical malfunctions are just too microscopic from a probability perspective to be likely at all. A phenomenon like that, that happens to both engines at the same time, must be due to an external source related to the atmosphere the aircraft is flying through, unless there is some other system on board that impacts both engines equally if it malfunctions, and that's something you won't generally see design wise.
I would try this question on PPrune Forums. Somewhere there is a King Air or Twin Otter driver that's had the same experience.
answered 8 hours ago
John KJohn K
42.5k1 gold badge78 silver badges146 bronze badges
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add a comment
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$begingroup$
My guess, and it's just a wild guess, is humidity based ice forming somewhere in the inlet and/or the inlet plenum, more or less similar to carburetor icing. The symmetrical torque drop is from the flow restriction and the random vibration is when the ice breaks up. I'll guess that you were flying though what appeared to be clear or clearish air with the inlet/plenum anti-ice turned off.
Double simultaneous random mechanical malfunctions are just too microscopic from a probability perspective to be likely at all. A phenomenon like that, that happens to both engines at the same time, must be due to an external source related to the atmosphere the aircraft is flying through, unless there is some other system on board that impacts both engines equally if it malfunctions, and that's something you won't generally see design wise.
I would try this question on PPrune Forums. Somewhere there is a King Air or Twin Otter driver that's had the same experience.
answered 8 hours ago
John KJohn K
42.5k1 gold badge78 silver badges146 bronze badges
$endgroup$
add a comment
|
$begingroup$
My guess, and it's just a wild guess, is humidity based ice forming somewhere in the inlet and/or the inlet plenum, more or less similar to carburetor icing. The symmetrical torque drop is from the flow restriction and the random vibration is when the ice breaks up. I'll guess that you were flying though what appeared to be clear or clearish air with the inlet/plenum anti-ice turned off.
Double simultaneous random mechanical malfunctions are just too microscopic from a probability perspective to be likely at all. A phenomenon like that, that happens to both engines at the same time, must be due to an external source related to the atmosphere the aircraft is flying through, unless there is some other system on board that impacts both engines equally if it malfunctions, and that's something you won't generally see design wise.
I would try this question on PPrune Forums. Somewhere there is a King Air or Twin Otter driver that's had the same experience.
answered 8 hours ago
John KJohn K
42.5k1 gold badge78 silver badges146 bronze badges
$endgroup$
My guess, and it's just a wild guess, is humidity based ice forming somewhere in the inlet and/or the inlet plenum, more or less similar to carburetor icing. The symmetrical torque drop is from the flow restriction and the random vibration is when the ice breaks up. I'll guess that you were flying though what appeared to be clear or clearish air with the inlet/plenum anti-ice turned off.
Double simultaneous random mechanical malfunctions are just too microscopic from a probability perspective to be likely at all. A phenomenon like that, that happens to both engines at the same time, must be due to an external source related to the atmosphere the aircraft is flying through, unless there is some other system on board that impacts both engines equally if it malfunctions, and that's something you won't generally see design wise.
I would try this question on PPrune Forums. Somewhere there is a King Air or Twin Otter driver that's had the same experience.
answered 8 hours ago
John KJohn K
42.5k1 gold badge78 silver badges146 bronze badges
edited 7 hours ago
answered 8 hours ago
John KJohn K
42.5k1 gold badge78 silver badges146 bronze badges
answered 8 hours ago
John KJohn K
42.5k1 gold badge78 silver badges146 bronze badges
answered 8 hours ago
John KJohn K
42.5k1 gold badge78 silver badges146 bronze badges
42.5k1 gold badge78 silver badges146 bronze badges
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Thank you! I’ve posted the question on the site you mentioned as well.
answered 7 hours ago
AV8trixAV8trix
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Does this mean you are the same person as @user44149? The you should have commented on the answer you are refering to.
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– PerlDuck
6 hours ago
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Yes, registered after I asked the question :)
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– AV8trix
6 hours ago
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I see. You can join the two accounts, see the help center: aviation.stackexchange.com/help/merging-accounts
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– PerlDuck
6 hours ago
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Done, thank you
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– AV8trix
6 hours ago
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Please don't add "thank you" as an answer. Once you have sufficient reputation, you will be able to vote up questions and answers that you found helpful. - From Review
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– Ralph J
4 hours ago
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show 2 more comments
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Thank you! I’ve posted the question on the site you mentioned as well.
answered 7 hours ago
AV8trixAV8trix
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Does this mean you are the same person as @user44149? The you should have commented on the answer you are refering to.
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– PerlDuck
6 hours ago
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Yes, registered after I asked the question :)
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– AV8trix
6 hours ago
2
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I see. You can join the two accounts, see the help center: aviation.stackexchange.com/help/merging-accounts
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– PerlDuck
6 hours ago
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Done, thank you
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– AV8trix
6 hours ago
1
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Please don't add "thank you" as an answer. Once you have sufficient reputation, you will be able to vote up questions and answers that you found helpful. - From Review
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– Ralph J
4 hours ago
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show 2 more comments
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Thank you! I’ve posted the question on the site you mentioned as well.
answered 7 hours ago
AV8trixAV8trix
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Thank you! I’ve posted the question on the site you mentioned as well.
answered 7 hours ago
AV8trixAV8trix
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answered 7 hours ago
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answered 7 hours ago
AV8trixAV8trix
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answered 7 hours ago
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1
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Does this mean you are the same person as @user44149? The you should have commented on the answer you are refering to.
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– PerlDuck
6 hours ago
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Yes, registered after I asked the question :)
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– AV8trix
6 hours ago
2
$begingroup$
I see. You can join the two accounts, see the help center: aviation.stackexchange.com/help/merging-accounts
$endgroup$
– PerlDuck
6 hours ago
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Done, thank you
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– AV8trix
6 hours ago
1
$begingroup$
Please don't add "thank you" as an answer. Once you have sufficient reputation, you will be able to vote up questions and answers that you found helpful. - From Review
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– Ralph J
4 hours ago
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show 2 more comments
1
$begingroup$
Does this mean you are the same person as @user44149? The you should have commented on the answer you are refering to.
$endgroup$
– PerlDuck
6 hours ago
$begingroup$
Yes, registered after I asked the question :)
$endgroup$
– AV8trix
6 hours ago
2
$begingroup$
I see. You can join the two accounts, see the help center: aviation.stackexchange.com/help/merging-accounts
$endgroup$
– PerlDuck
6 hours ago
$begingroup$
Done, thank you
$endgroup$
– AV8trix
6 hours ago
1
$begingroup$
Please don't add "thank you" as an answer. Once you have sufficient reputation, you will be able to vote up questions and answers that you found helpful. - From Review
$endgroup$
– Ralph J
4 hours ago
1
1
$begingroup$
Does this mean you are the same person as @user44149? The you should have commented on the answer you are refering to.
$endgroup$
– PerlDuck
6 hours ago
$begingroup$
Does this mean you are the same person as @user44149? The you should have commented on the answer you are refering to.
$endgroup$
– PerlDuck
6 hours ago
$begingroup$
Yes, registered after I asked the question :)
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– AV8trix
6 hours ago
$begingroup$
Yes, registered after I asked the question :)
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– AV8trix
6 hours ago
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2
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I see. You can join the two accounts, see the help center: aviation.stackexchange.com/help/merging-accounts
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– PerlDuck
6 hours ago
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I see. You can join the two accounts, see the help center: aviation.stackexchange.com/help/merging-accounts
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– PerlDuck
6 hours ago
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Done, thank you
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– AV8trix
6 hours ago
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Done, thank you
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– AV8trix
6 hours ago
1
1
$begingroup$
Please don't add "thank you" as an answer. Once you have sufficient reputation, you will be able to vote up questions and answers that you found helpful. - From Review
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– Ralph J
4 hours ago
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Please don't add "thank you" as an answer. Once you have sufficient reputation, you will be able to vote up questions and answers that you found helpful. - From Review
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– Ralph J
4 hours ago
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