Page 19 - Volume 12 Number 1

KING AIR
WINDOW INSERTS
STC’D-PMA/FAA APPROVED
What Is the Difference
Between the G & D Aero Tinted Window Insert and the Polaroid Interior Window Insert?
The $$$$$ Cost
With the G & D Aero tinted window you have full time protection against the sun and the ability to keep your passengers cool and comfortable. No need to make any adjustments to the windows because the inserts work full time.
G&D AERO PRODUCTS
951-443-1224
I noticed this in both your book and a video I saw on the King Air Academy’s YouTube channel, so I was curious about that.
Cheers! Xandi
My reply:
Hello again, Xandi. On a scale of one to 10, what I am about to write is probably a two or three, so not critical at all. Doing it either way is fine. But ...
I choose to get as much N1 – and hence as much airflow – through the engine before I ever introduce fuel. By doing so, I guarantee the coolest possible start because of the extra cooling air. You will notice the Beechcraft checklist says that on the first start you can bring in fuel at 12 percent N1 or above. I disagree and think it should state “when the N1 stabilizes,” to get more airflow and hence a cooler ITT peak. Also, this lets you have a better feel for battery health: Does the N1 stabilize at 14 percent or 18 percent?
As long as the first engine’s generator is off when the starter switch for the second engine is activated, the chance of blowing a current limiter is basically zero. The huge peak amperage flow only occurs when the engine is stopped; no rotation. When rotation begins, the amperage demand drops off rapidly and significantly. So, by getting the first generator on now and allowing it to spin the starter faster – we see maybe 20 percent or even more when N1 stabilizes versus the approximate 16 percent with battery alone – we achieve a much cooler starting ITT peak.
So, as I said, either method works fine, but my goal is to keep temps as low as practicable and my technique does that.
More 200 (C-12) Questions
C-12 Instructor Pilot Galen Collins, of the Navigator Development Group, in Dothan, Alabama, asked the following four questions. My responses follow each question:
Thank you for your receptiveness to answering questions about King Air equipment. I have a few questions below if you have the time. I am flying US Army C-12s (King Air B200C).
As part of the engine oil cooling system, there is a vernatherm valve that will automatically open and close a small door below the engine oil cooler. The mechanism to operate the door would appear to be based on the temperature of the oil itself as I have physically seen the door in action without the engine operating. Our operating manuals do not discuss this feature and I was wondering if you might have any further information about it – how does it operate and at what temperatures makes it work?
JANUARY 2018
KING AIR MAGAZINE • 17