Commercial Fixed Wing
Flight Crew Last 90 Days 50; Flight Crew Total 10000; Flight Crew Type 7000
Situational Awareness
ATC Issue All Types; Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Unstabilized Approach
Aircraft Equipment Problem Dissipated; Flight Crew Became Reoriented; Flight Crew Overcame Equipment Problem
ATC Equipment / Nav Facility / Buildings; Aircraft
On approach to Runway 10 at MTPP; we got false glideslope information with the autopilot engaged. Localizer and glideslope were captured. The localizer had also been properly identified. We were descending through approximately 3;000 FT on the glideslope when the downslope all of a sudden showed us low. The aircraft pitched up to maintain glideslope. The Captain; who was the flying pilot; disconnected the autopilot and we continued the approach visually to an uneventful landing.
ILS coupled being flown in VMC. Everything normal until approximately 2;500 FT when aircraft pitched up approximately 15 degrees. I left engaged to see what it would do and it climbed rapidly to over 4;000 FT while still showing on GS. Disconnected prior to stall and took over manually.
Air Carrier flight crew reports capturing a false glideslope during a visual ILS to Runway 10 at MTPP. Descending through 3;000 FT with the autopilot engaged; the glideslope suddenly showed low and the autopilot pitched up to maintain the new glideslope. Approach is continued manually to a normal landing.