References
and performance
On the glide slope pointer a letter P is displayed to indicate VGP.
When VGP mode is armed, both letter P and pointer appear on the left hand side of vertical deviation
scale.
When captured the symbol moves to the right hand side of the vertical deviation scale.
When flying to the MAP (Missed Approach Point) or within 5 nm from the FAF, any selected collective
mode automatically disengages and the VGP mode is automatically captured, so the helicopter adjusts
collective to hold the VGP.
Conditions for capturing VGP mode:
• VGP mode must be armed
• FMS active waypoint is the MAP or helicopter is within 5 nm of the FAF
• If holding, helicopter must be established on the inbound course to the FAF
• Helicopter is able to capture the final approach slope
As the helicopter approaches the runway threshold, ALVL mode is automatically engaged and collective
is commanded for an asymptotic flare.
If MAP height (in the Navigation Data Base) is greater than 150 ft AGL:
•
when helicopter is 100 ft above the MAP the
VTA
(Vertical Track Alert) flag appears on the ADI
• when helicopter is at the MAP the VGP mode disengages
The
VTA
annunciator shares the same location as the Decision Height (DH)
MIN
annunciator.
The
MIN
annunciator has the highest priority.