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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
The conditions resulting in latched speed protection are as follows:
1. A latched speed occurs at the last bottom--of--descent (BOD) when
the current speed command is more than 5 kts above the current
airspeed. This is also true when the BOD altitude constraint is
deleted.
2. A latched speed occurs when the altitude preselector is dialed while
in ALT to a BOD and the current target is greater than 5 kts more
than the current speed.
3. When VNAV has transitioned out of VPATH and the current airspeed
is not within 5 kts of the speed command.
4. When VNAV is in VPATH and the CAS becomes greater than V
+ 10 kts, VNAV changes to VFLCH and latches to V
The LATCHED SPEED mode is removed by entering *DELETE* from
the scratchpad to line select key 1R on page 1 of the ACTIVE FLT
PLAN.
A28- - 1146- - 181
REV 3 Mar 2009
Honeywell International Inc. Do not copy without express permission of Honeywell.
Figure 7- -32
Latched Speed Protection
01685.02
.
MO
Flight Plan
MO
7-55
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