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Checking the Airspeed Indicator For Leaks

My name is Rob Chipman and I’m a realtor and pilot based in Vancouver, BC. I AM NOT A FLIGHT INSTRUCTOR AND I AM NOT OFFERING FLIGHT INSTRUCTION! I am sharing my study notes and other things I’ve learned while getting my education as a pilot. You’re welcome to make use of this information, but do not treat it as expert advice.

I really enjoy flying, real estate and the Chilcotin.  My company is Coronet Realty Ltd., located at 3582 East Hastings Street, Vancouver, BC, V5K 2A7. I have a C-150L that I own with two other pilots, based out of Pitt Meadows. Do not hesitate to contact me by email if I can help you do anything, especially if its likely to be interesting or concerns selling remote property in British Columbia.

I came across this at BackcountryPilot.org; if originates with the FAA. It is a check for leaks in the ASI system – it is not an ASI test.

Airspeed check:

Slip a long rubber hose over the pitot mast (surgical tubing is recommended).

As one person reads the airspeed, the other should very slowly roll up the other end of the tubing. This will apply pressure to the instrument. When the airspeed indicator needle reaches the aircraft’s approximate recommended cruise speed, pinch the hose shut, and hold that reading. The airspeed needle should remain steady for a minute if the system is sound.

A fast drop off will indicate a leak in the instrument, fittings, lines, or the test hose attachment.

NEVER force air in the pitot tube or orally apply suction on a static vent. This will cause damage to the instruments.


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