Page 30 - Volume 15 Number 10

to suggest. But it is super easy and it verifies that the other source of inverter power, the alternate source, is working properly. Remember, if the inverter keeps working after the center bus goes dead, we have learned that the normal inverter power source is OK. To verify that the alternate source is also OK, simply turn on one inverter with only the battery switch on with no bus ties closed. Does the inverter light extinguish, and the inverter works fine? Great! Now check the other inverter and, I hope, find that it also can operate. Twice in my King Air instructing travels I found F90s in which the inverter would not operate without the generator buses being powered. They had lost their alternate inverter power source. I ask you, maybe a couple of times a year, to verify that both of your inverters operate after you have turned the battery switch on but nothing else. Do it occasionally as part of your cockpit checks in the hangar.
To complete the Beech After Start electrical checks procedure, all that remains is to momentarily tap the BUS SENSE switch up to RESET to allow all three bus tie relays to return to their closed status. Ah, now at last it’s time for avionics and air conditioning! The electrical checks are finished.
I won’t ask for a show of hands to indicate how many of you run this check on your day’s first flight. There wouldn’t be many raised hands, would there? Guess what? My hand wouldn’t be up either.
My educated opinion concerning this check as well as run-up items like autofeather, rudder boost and overspeed governor checks is that even if they have been tested 20 times in the last hour, it is impossible to know if they will work the next time. Before going in for a Phase check, especially coming out of a Phase check or other invasive maintenance procedure, take the time and run
ALL of the checks completely, slowly and with understanding of what is right and wrong. Normal operation, however? I am not an advocate of the time, fuel and noise it takes to do all checks routinely. On a deadhead leg once a month or so? Now you’re making sense! KA
King Air expert Tom Clements has been flying and instructing in King Airs for over 46 years and is the author of “The King Air Book” and “The King Air Book II.” He is a Gold Seal CFI and has over 23,000 total hours with more than 15,000 in King Airs. For information on ordering his books, contact Tom direct at twcaz@msn.com. Tom is actively mentoring the instructors at King Air Academy in Phoenix.
If you have a question you’d like Tom to answer, please send it to Editor Kim Blonigen at editor@blonigen.net.
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OWNER: Village Press Inc, 2779 Aero Park Dr, Traverse City, MI 49686-9100 PUBLISHER: Village Press Inc EDITOR: Kim Blonigen HEADQUARTERS OF PUBLISHER: 2779 Aero Park Dr, Traverse City MI 49686-9100 CIRCULATION - Average Each Issue During Last 12 Months: A. Total Copies Printed: 4,489; B. Paid/Requested Circulation: 1. Outside-County, 2,311; 2. In-County, 0; 3. Outside the Mail, 1; 4. Other Classes USPS Mail, 14; C. Total Paid/Requested Circulation (B 1-4), 2,326; D. Free/Nonrequested Circulation: 1. Outside-County, 2,041; 2. In-County, 0; 3. Other Classes USPS Mail, 1; 4. Outside the Mail, 0; E. Total Free/Nonrequested Circulation (D 1-4), 2,042; F. Total Distribution, 4,368; G. Copies Not Distributed, 121; H. Total (F and G), 4,489; I. Percent Paid/Requested, 53.25%. CIRCULATION - Single Issue Nearest Filing Date: A. Total Copies Printed, 4,500; B. Paid/Requested Circulation: 1. Outside-County, 2,305; 2. In-County, 0; 3. Outside the Mail, 0; 4. Other Classes USPS Mail, 9; C. Total Paid/Requested Circulation (B 1-4), 2,314; D. Free/Nonrequested Circulation: 1. Outside-County, 2,054; 2. In-County, 0; 3. Other Classes USPS Mail, 0; 4. Outside the Mail, 0. Total Free/Nonrequested Circulation (D 1-4), 2,054; F. Total Distribution, 4,368; G. Copies Not Distributed, 132; H. Total (F and G), 4,500; I. Percent Paid/Requested, 52.98%. Rebecca Mead, Chief Financial Officer
28 • KING AIR MAGAZINE
OCTOBER 2021