Propeller De-icing can be checked by
- checking the the de-icing ammeter.
- checking the torque meter for abnormal readings.
- visually checking for ice on the blades.
Explanation
Correct operation of an electrical propeller de-icing system is verified by watching the de-icing ammeter, which should show the cyclic rise and fall of current as the timer energises each blade section in turn. A torque-meter reading or simply looking for ice would not confirm the electrical heating is cycling correctly.
obrien99 asking:
Could somebody explain this one please. I thought de-icing would be checked via the ammeter and looking for the current drop between cycles.
Community Comments (8)
D
dimky Posts: 514 05.03.2012 / 21:05
Hello Obrien.
How I understand this question: if propeller is covered with ice torque meter will show abnormal readings because of disturbed airflow. During de-icing torque meter readings will move from abnormal to normal. This will tell what de-icing goes right. But I'm not sure and can be wrong.
Maybe better to change question to: "Propeller de-icing process can be checked by"
What do you think?
How I understand this question: if propeller is covered with ice torque meter will show abnormal readings because of disturbed airflow. During de-icing torque meter readings will move from abnormal to normal. This will tell what de-icing goes right. But I'm not sure and can be wrong.
Maybe better to change question to: "Propeller de-icing process can be checked by"
What do you think?
O
obrien99 Posts: 17 06.03.2012 / 21:55
Yes i would agree that the torque meter could be used to check the de-icing system is working, But would have thought the ammeter would be the more correct answer. Would be interesting to see what the CAA think.
D
dimky Posts: 514 06.03.2012 / 22:15
Ammeter can only show what de-icing system is working correct (it consumes current) but torque meter will show what de-icing working effectively. This is how I understand, maybe someone more experienced can explain.
O
obrien99 Posts: 17 06.03.2012 / 23:23
do you know how the flight crews check the prop de ice is working?
ammeter or torque meter or both?
PS thanks for your help :)
ammeter or torque meter or both?
PS thanks for your help :)
D
dimky Posts: 514 07.03.2012 / 22:32
This is just my opinion, I'm not expert, I'm also student, as you. :) So I'm not sure. Question taken from question bank, maybe author wrong. I hope someone will explain. :)
T
TURIN Posts: 4 16.03.2012 / 17:32
If you are not in iceing conditions on the ground there must be a way to check that the system is working. Therefore answer a, would be incorrect and b, would be 'more' right.
A
alberto Posts: 8 07.04.2013 / 13:55
In my opinion and as given on part 66 question answer a is correct. One of the main reason why an ammeter is in the flight deck is to observe the de-icing. The torque meter can be affected from many other factors more than icing, so you cant really determine the de-icing. If you are in the ground the best way to determine proper operation of electrical de-icing boots is by feeling the sequence of boot heating and have an assistant observe the load meter indications in the flight deck. In this question the there is no indication if the de-icing is electrically or by fluid, therefore best answer will be question A.
R
rosas_ronald Posts: 1 25.08.2013 / 16:47
If its monitored, answer wud b ammeter, if its checked, it wud b torque meter. Pls refer part66 blog.
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