Description The APP mode provides the capability to steer the aircraft to capture and hold the ILS Localizer
(LOC) and Glide Slope (GS).
LOC must be selected by the pilot in command as the Primary Navaid via the NAV button on the
Display Controller (DC) and displayed as the CDI and the associated digital readout on the HSI.
Aircraft axes control is performed via:
• roll attitude for LOC
• collective input for GS
Engagement • Arming:............. Press APP button on Guidance Controller
• GS and LOC modes are armed
• HDG mode is automatically engaged and the present heading held
References
and performance
The LOC inbound (front) course can only be set and adjusted by the COURSE knob on the Remote
Instrument Controller (RIC).
At LOC capture, HDG mode automatically disengages and LOC mode automatically engages, so
the helicopter turns to track the selected localizer.
At GS capture, any selected collective mode automatically disengages and GS mode automatically
engages, so the helicopter adjusts collective to hold the glide slope.
Upon completion of ILS Approach, ALVL mode is automatically engaged.