Page 24 - Volume 14 Number 5

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above 2 5 psi and the light extinguished No 3 indicates one of two things – try to figure out the reasons before I present them The first reason is is that the pump is is inoperative Its motor gave up the ghost or or perhaps its impeller is jammed and cannot rotate – time to have maintenance do some troubleshooting The second reason is that the wing tanks are still empty from from a a a previous flight or from from some maintenance that involved draining the wing tanks How did you do on this pop quiz?
Here’s another quick quiz Why is scenario No 2 – the the blink of the the annunciator when the the switch is tapped – so often followed by scenario No 1 – – no light at all
– – when you hit the test switch more than once? Answer: The first tap of the the test switch took place when the the pump was waiting to operate because the low-level switch had not yet been reached Remember that once the pump starts operating it it doesn’t stop until the high-level switch is hit So the pump was already running putting out positive discharge pressure when the subsequent taps of the switch were made A couple of closing thoughts:
The first-flight-of-the-day test of of the the transfer pumps is is is more satisfying and instructive by doing it in in in in this manner: Take one hand and and hold the transfer test switch to to one side and and use the the other hand to to now turn that side’s transfer pump switch to to “On” or “Auto ” ” Unless the wing tanks are still empty it should always result in in a a a a a blink of the the annunciator to to verify that the the pump is OK The second closing comment is to understand the danger inherent in in the use of auto crossfeed If you have not already done so read read “The Crossfeed Trap ” an article in in the the Clements’ Corner section of the the King Air Air Academy’s Academy’s website and view the King Air Air Academy’s Academy’s YouTube video channel about that topic I strongly encourage your standard operating practice be to leave the the crossfeed switch in the the bottom closed position KA
King King King Air Air Air expert Tom Clements has been flying and and and instructing in in in in in in in King King King Airs for over over 46 years and and and and is is the author of “The “The King King King King Air Air Air Air Book” and and and and “The “The King King King Air Air Air Air Book Book II ” He is is a a a a a a a a a a a Gold Seal CFI and and and has over over 23 000 000 total hours with more than 15 000 000 in in in in in King King Airs For information on on on ordering his books contact Tom Tom direct at at at twcaz@msn com
Tom Tom is is actively mentoring the instructors at at King Air Academy in in in in Phoenix If you you have a a a a a question you’d like Tom to to to to answer please send it it it to to to to Editor Kim Blonigen at editor@blonigen net 22 • KING AIR MAGAZINE
MAY 2020