BendixKing KFC 500 - Manual (Page 10)

Normal Operation Normal Operation
10 11 March 27, 1998 006-18081-0000 006-18081-0000 March 27, 1998
has been detected or if SCAS/AP
PWR is OFF. Single axis failures will
not cause the SCAS (yellow) or AP
(yellow) annunciation’s to light on the
selected system. You will get an axis
failure only (i.e. AFCS PIT). A roll or
pitch axis failure indicates that con-
trol of that axis has been lost. A yaw
axis failure indication means that
yaw axis or trim follow up in yaw axis
is lost. If it is only a yaw trim axis fail-
ure the annunciator will extinguish if
SCAS engaged. An Autotrim failure
indication means that roll or pitch trim
has failed and more attention will
need to be given to see that the sys-
tem is kept within the control author-
ity of the main servo by using the
FTR switch to keep the system work-
ing within its control range. The non-
selected system will annunciate AP
and SCAS Fail annunciation for sin-
gle axis failures in roll, pitch and/or
Rate Gyro failure. The non-selected
system will annunciate AP Fail for
pitch and roll trim axis failure and / or
when vertical acceleration is invalid
or Vertical Gyro is invalid after nor-
mal power up delay. If this side is
selected then the annunciation will
display the single or multiple axis fail-
ures applicable and clear the AP and
/ or SCAS Fail annunciation if any
axis is available for use.
Modes of Operation
The KMS 541 Mode Select Panel
provides control and annunciation of
the KFC 500’s SCAS and AP (atti-
tude retention) modes of the selected
system. To activate the SCAS or AP
modes using the Mode Select Panel,
momentarily press the desired push-
button. The corresponding mode
lamp will illuminate above the switch.
Alternatively, to deactivate the SCAS
or AP mode when activated, momen-
tarily press the respective push-but-
ton (The AP mode reverts to SCAS
when deselected). There are remote
repeater AP ON, SCAS ON annunci-
ators located above the mode selec-
tor panel that is switched to the
selected system. These annunciators
will mimic the ones located above
the mode switches on the Mode
Select Panel. The brightness of the
annunciator lamps on the mode con-
troller is adjusted automatically by a
photocell located on the face of the
unit. The button nomenclature back
lighting is controlled by the pedestal
dimmer control on the overhead
panel.
SCAS Mode
Momentarily pressing the SCAS but-
ton on the Mode Select Panel will
activate the stability augmentation
mode on the selected system. The
mode lamp above the switch on the
MSP and the remote repeater SCAS
ON annunciator will illuminate to ver-
ify that the selected flight computer
has recognized the button push.
The SCAS (Stability Control
Augmentation System) mode pro-
vides rate damping. It may be
referred to as a damper system that
TEST/BRT/DIM (AFCS LAMP
TEST)
Moving the TEST/BRT/DIM Switch,
located on the overhead panel below
the Emergency Bus 1 Breakers, to
the test position will invoke an AFCS
test function that will turn on the
annunciators in the KMS 541 Mode
Select Panel. These annunciations
shall remain on as long as the switch
is held in test position up to a maxi-
mum of 15 seconds. This lamp test
function can be invoked any time
desired by the pilot and has no effect
on mode operation. An automatic
lamp test function is performed upon
power up of the Mode Select Panel
and will turn on all MSP annunciators
for approximately 2 seconds immedi-
ately after power is applied. These
annunciators may also be turned on
by a special test bit from the FCC
during part of its preflight testing. See
Bell Helicopter 430 Flight Manual for
other functions activated by this
switch in the test position.
SCAS
SCAS ON
ı
AP SCAS
SCAS &
AP PWR 2
OFF
SCAS &
AP PWR 1
OFF
KMS 541 SCAS/AP Mode Select Panel
TEST
DIM
B
R
T
SCAS/AP Annunciators
There are nine annunciators for the
system available on the IIDS
(Integrated Instrument Display
System), AFCS DISC (red), 1 SCAS
and SCAS 2 (yellow), 1 AP and AP 2
(yellow), AFCS PIT (yellow), AFCS ROL (yellow), AFCS YAW (yellow),
and AUTOTRIM (yellow). The SCAS
(1)/(2) and AP (1)/(2) failure annunci-
ators will be illuminated any time
prior to preflight test being per-
formed, after a major system failure