Description The IAS hold mode generates pitch commands to maintain a selected aircraft airspeed.
Engagement • Direct: .................................................... Press IAS button on Guidance Controller
• Automatic:.......... IAS mode automatically engages when ALTA mode is selected
or DCL mode is armed
Initial conditions IAS mode maintains the airspeed existing at the time of engagement.
References and
performance
When engaged the airspeed reference is displayed as a set bug and a digital readout in
magenta on the Airspeed Indicator on PFDs.
The airspeed reference bug is adjusted by either:
• setting either pilot or copilot cyclic Beep TRIM switches to UP (to reduce IAS) or DN
(to increase IAS) (Beep rate: ±3.5 kts/s)
• repositioning the cyclic, with the FTR button depressed, to the required airspeed and
releasing FTR button.
The airspeed reference is adjustable via the cyclic beep switch between 60 KIAS and (Vne
– 5) KIAS.
If airspeed, at time of engagement, is higher than (Vne – 5) KIAS, then it is automatically
reduced to (Vne – 5) KIAS.
Note that the IAS reference will not increase when Vne increases.
The IAS reference is resynchronized when there is a transition from FD Uncoupled to FD
Coupled.