Page 23 - Oct24

“Throughout the course of my more than 50 years of King Air pilot instruction, teaching the electrical system always ranked high on the difficulty scale ... ”
Pilots N Paws®
is an online meeting place for
pilots and other volunteers
who help to transport rescue animals by air. The mission of the site is to provide a user- friendly communication venue between those that rescue, shelter, and foster animals; and pilots and plane owners willing to assist with the transportation of these animals.
Joining is easy and takes just a minute of your time.
www.pilotsnpaws.org
®
VRSLAB (valve-regulated, sealed, lead-acid battery) replacement. The battery charge annunciator is no longer required with a lead- acid battery since it does not have thermal runaway potential.
The battery is typically wired directly to a bus that is always “hot” with voltage whenever the battery is installed. This bus is named the hot battery bus and is usually located in or very near the battery box. Some convenience items, as well as some components that were considered most important by the engineers, receive power from this bus. These include the door and baggage compartment lights, boost pumps and crossfeed in the LJ series and, often, standby fuel pumps and fuel firewall shutoff valves. The fuel-related items that receive power from this hot battery bus, for redundancy, also receive power from their own fuel panel bus after the battery and/or generator is switched on, as we will see.
The generators, which do double duty as the starter motors, are made by Lear-Siegler and originally were rated at 200 amperes (amps) maximum continuous output. Beginning with the C90 and the 100 series, better cooling ducts were incorporated, allowing the maximum generator output to be upped to 250 amps. Instead of presenting the generator output on a gauge marked in amps, the decision was made to mark the gauge with decimal equivalents relating to the maximum rating. For example, with the 250 amp generators, a gauge reading of 0.20 would indicate a current output from the generator of 50 amps (250 amps maximum x 0.20). In more recent years, these gauges—load meters—have been marked in units of percent, so the 0.20 reading is now 20%.
It is important to realize that there is no actual limit on maximum generator output. If a direct ground short occurs on the generator output line, the current will immediately rise to 1,000 amps or more! This excessive workload would create too
Together, we can support all your King Air braking needs, one landing at a time.
Main wheel & brake Main wheel & brake Main wheel & brake Nose wheel
Kit P/N 199-90 Kit P/N 199-110 Kit P/N 199-125 Kit P/N 199-126
Cleveland Wheels & Brakes
Cleveland Wheels & Brakes, FAA, EASA, and ANAC approved STC conversion kits for most King Air models now include C90GT, C90GTi, and B200GT. Engineered and designed for:
• Easeofliningreplacement
• Reduced maintenance time
• Competitive operating costs
Want to learn more? Contact customer support at 1-800-BRAKING (1-800-272-5464)
www.kaman.com/cleveland www.clevelandwheelsandbrakes.com
OCTOBER 2024
KING AIR MAGAZINE • 21