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Test Performed on Cessna's Integral Wing Tank for ACO Wichita, Kansas.
Report Author: Robert E. Scovill, Jr.
Date of Test: January 21, 2000
Date of This Report: Feb 1, 2000
Place of inspection: Murfreesboro Airport, Murfreesboro, Tennessee
Test performed on aircraft number 17274599, Model 172P, year of Model 1981.
FAA Aviation Safety Inspectors present:
Craig Roberts, FSDO; Nashville, Tennessee
Paul Jones, FSDO; Nashville, Tennessee
Robert Lee Cunningham, ASO-FSDO, Orlando Florida
Primary Maintenance Inspector of Embry Riddle Aeronautical University
Others present:
Robert E. Scovill Jr., Owner of Aircraft 1724599 (Model 172P, Year 1981)
Commercial Pilot Cert. No: 2146452, Airplane Single & Multiengine Land, Instrument Airplane
Purpose of inspection: To satisfy the FAA Aircraft Certification Office (ACO) Wichita, Kansas's request for testing the aircraft's integral wing tank drainage system with the aircraft level about its front-rear axis and wing axis, and to measure the wing's angle of incidence to determine proper wing attachment.
Images courtesy FAA FSDO; Nashville, Tennessee.
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The inspection was performed in a hangar. First, the aircraft was leveled.
Close-up of front-rear axis leveling. |
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The aircraft was leveled on its front-rear axis. |
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Close-up of wing axis leveling. |
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The aircraft was leveled on its wing axis. |
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The wing's angle of incidence indicated proper wing attachment. |
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After the aircraft was leveled and its wing's angle of incidence was measured, the sump drains on both wing tanks were drained. Page 4 of Service Kit SK182-100 shows the five sump drains on each wing that was drained. The term ten-sump sample as used in this report refers to the sampling of each of the five sump drains located on each wing whereby a one-sump sample is a 1.75-ounce volume of fuel drained from one sump drain and visually inspected to determine if the sample contained water. Thus, the term ten-sump sample means that each of the five sump drains on each wing was sampled.
A ten-sump sample was taken, and no water was detected.
(Note: In a test performed on May 19, 1999, food colored water was tested in a fuel sample, and the test demonstrated that a food color ingredient does not change water behavior (fluid motion) visible in fuel. In this report, water means water with red food color added to make the water more visible for test purposes.)
Next, the inspection team introduced 32-ounces of water into the left wing fuel tank and 32-ounces of water into the right wing fuel tank through the access holes of each wing.
Then an additional 20-ounces of water was introduced into the left wing fuel tank and an additional 20-ounces of water was introduced into the right wing fuel tank through the fuel filler ports of each wing.
At this point in the test, a total of at least 52-ounces of water are known to be in each wing's fuel tank. A time interval of about 30-minutes was permitted to pass. Then a ten-sump sample was taken. There was no water detected in any of the sump drain samples.
End of report.
Robert E. Scovill , Jr.
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