Page 36 - March19

Technically...
From Multi-Engine Turboprop
Communiqué # ME-TP-0011:
Dated: February 2019
ATA 00 – Model 90, 200 and 300 Instructions for
Continued Airworthiness
Textron Aviation has recently made a number
of Instructions for Continued Airworthiness
(ICA) documents available on the txtavsupport.
com website. These ICAs are for factory installed
supplemental type certificates (STCs) installed in
recent production aircraft as well as several common
kit installations which could have been installed after
aircraft delivery.
Links to vendor sites have been provided for STC
ICAs not owned by Textron Aviation. To access these
ICAs, log in to txtavsupport.com, select the aircraft
model on the left, then in the “Aircraft Publications”
block, select “Instructions for Continued
Airworthiness.”
ATA 56 – Electronic Window Shade – Description
and Operation
LJ-2129 and after; BY-207, BY-239, BY-250 and after;
BZ-1 and after; FL-954, FL- 1010, FL-1031 and after
NOTE: The Electronic Window Shades are covered in
the appropriate Maintenance Manuals Chapter 56 for
System and Operation; the Wiring Diagram Manuals
Chapter 44 and the Illustrated Parts Catalogues
Chapter 25.
Introduction
The Fusion King Air Electronics Window Shades
are programmed to default to dark on the ground
in normal operation, in order to prevent sunlight
from overheating the cabin. When powered, each
window shade draws less than 50mA to be in a clear
state. The purpose of the following paragraphs is to
describe the timing, operation, and source of the
power used to drive clear window shades.
On each cycle of the cabin door or entry switch, the
cabin window shade system draws its power from
the main ship battery for 10 minutes to power the
windows to a “clear state” to provide light to safely
enter or exit the cabin.
Each of these cycles will also cause the Emergency
Egress Window Power Supplies (EEWPS) to go
through a 45-minute cycle. Multiple instances of this
without the whole aircraft being powered up long
enough to recharge them could cause them to fail the
45-minute requirement. The EEWPS is a separate
battery that only powers the emergency egress
window shade.
Pre-Boarding Operation
On C90/B200 Fusion King Air opening the cabin door
triggers the Main Switching Unit (MSU) to command all
shades to a clear state for approximately 10 minutes.
On B300 [models] this initial Pre-Boarding timer
is not activated by opening the
door but rather by the Entry
Switch Located on the LH side
wall of the entry vestibule.
If the door is closed or the entry
switch turned off prior to the
Furnishings/Interiors Master
switch being turned on will
result in the MSU immediately
switching off. In this instance the
windows not on EEWPS would
immediately return to a dark
state. The windows on EEWPS
will begin a 45 +/- two-minute
cycle of a clear state before
returning to a dark state.
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­ KING AIR MAGAZINE MARCH 2019