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Jims Web Site
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Date: 5-9-2013
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Number of Hours: 5.00
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Manual Reference: (none)
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Brief Description: nose high/nose low fuel flow tests
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We're definitely out of the buildfing phase, and into the testing phase. That means fixing problems we find, which slows the process a bit.
The main gear was placed on concrete blocks, then the nose lowered to -10 degrees, Fuel flow was measured for stbd tank, "a" pumnp, then "b" pump. Measurements were then made for the port tank for pumps "a" and "b."
Following this, the nose was raised to +15 degrees, and the test repeated. The same tests had already been run with the fuselage level, so testing was conducted in a total of 12 configurations,
Required fuel flow for a 6 gal/hour @ 100% engine is 150%, or 9 gallons. The fuel flow met or exceeded this in every configuration.
The fuel pump circuit breaker, which is in series with both pumps, tripped at the end of testing. It reset satisfactorily. Speculation is that it heated as a result of the numerous stop-start operations of the pumps.
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level configuration
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nose low configuration
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nose high configuration
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