Overspeed Protection - Honeywell PRIMUS 1000 Pilot's Manual

R
PRIMUS 1000 Integrated Avionics System

OVERSPEED PROTECTION

When in MAXSPD, the flight guidance system adjusts the pitch to
reduce airspeed to the V
as they were. When airspeed is reduced below the V
FGS returns to the annunciated flight director mode.
The aircraft can operate without tripping the overspeed protection at
V /M plus a tolerance of 5 knots IAS. This is to prevent nuisance
MO MO
tripping of the overspeed protection submode during steady state
V /M descents. If the aircraft is relatively stable on the V
MO MO
then aircraft speed can exceed V
overspeed protection is initiated.
NOTE: These tolerances are applied only to the flight director
overspeed protection. The overspeed horn triggers at one
knot above V
when the airspeed trend vector exceeds V
the airspeed is equal to or greater than V
Once initiated, the overspeed protection displays
and uses the speed hold control to command the aircraft back to the
actual V /M target speed. The overspeed protection submode is not
MO MO
explicitly annunciated except through the
PFD. While overspeed protection submode is active, the existing
vertical mode (VNAV or VS) remains annunciated as the active mode
on the PFD.
The overspeed submode protection remains engaged until the existing
VS/VNAV pitch command no longer commands a pitch maneuver that
violates V /M
MO MO
NOTE: MAXSPD
OVERSPEED PROTECTION IN FLC
In speed hold mode, overspeed protection limits the target IAS/Mach
to the existing V
when the aircraft speed exceeds V
MAXSPD is removed from display when the aircraft falls below V
plus 5 knots.
Overspeed protection is disabled in basic pitch mode, altitude hold,
altitude capture, and glideslope modes.
Modes of Operation
6-54
/M limit. The flight director modes remain
MO MO
MO
/M . The speed digits change to
MO MO
.
is displayed on the PFD for at least 5 seconds.
/M value. MAXSPD
MO MO
/M up to a limit of 5.0 knots before
MO
MAXSPD
MAXSPD
is annunciated on the PFD
/M plus a tolerance of 5 knots.
MO MO
/M limit, the
MO MO
/M limit,
MO MO
amber
and red when
MO
.
MO
on the PFD
warning on the
/M
MO
A28–1146–134
REV 1 Jan/03
MO