Apologies. My attachment containing a water manometer for ASI
calibration was stripped, so here it is.
Feel free to ask any question to janselmi@netconnect.com.au
John
John Anselmi wrote:
> Attached is a copy from my old gliding maintenance manual for the
> construction of a simple water manometer for calibrating an ASI. A
> fish tank air pump and a small valve make an easier to use system than
> the syringe illustrated.
>
> If plastic tube is used for the water part of the manometer, a little
> dish-washing detergent should be used in the water so that it does not
> "stick" on the tube but flows smoothly.
>
> Comparative runs with increasing "air speed" and decreasing "airspeed"
> should be done to establish the degree of instrument lag.
>
> Be careful not to exceed the ASI travel range or damage may be done to
> the instrument.
>
> John Anselmi
>
> Cripps, David wrote:
>
>> As part of my annual permit renewal, my new UK PFA inspector has
>> asked me to carry out a check of the pitot static system and
>> instruments. I have located somewhere to get the ASI and altimeter
>> checked and calibrated as separate instruments, but what is the best
>> way to check out the plumbing of the pitot static system? Also, do
>> other people test their pitot static instruments 'in situ', by adding
>> pressure/vacuum directly to the pitot head? This would appear to test
>> the whole system - but how would you know whether any errors lay in
>> the instruments or in the plumbing.
>>
>> Any ideas on how to deal with this would be most welcome.
>>
>> David
>> GBWJH
>>
>>
>>
>>
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