Losing the Glide Slope!!

[Guest kevchris]

Hello:I am hopeful that someone with more knowledge can help me with this question.Tonight I was making an ILS approach to RWY 28 in New Orleans. I was flying the PMDG 737-700. Everything was fine - I had captured the localizer and glide slope and was lined up to land. Suddenly, at about 1500 feet, I lost the glide slope, the nose of the plane went up and I was forced to disengage the AP and land the plane myself. However, my aircraft seemed to lose control and turn to the northwest. I ended up "landing" sideways like I was skidding across ice.Does anyone know why I would suddenly lose the glide slope when everything was going fine up to that point? After a nice 2 hour trip from Tampa, the ending was a bummer!Thanks for any information.Kevin

[crvm 0]

Sounds like you were about to stall the plane and alpha protection kicked in. Did you have your landing VREF selected? What was you speed at G/S capture?[h4]Best Wishes,Randy J. Smithhttp://www.precisionmanuals.com/images/betaimg.jpg

[Guest kevchris]

Randy -Very good possibility. I had disengaged the auto throttle also and was manually controlling the speed. I am not sure what my speed was when this happened. Can you tell me what my speed should have been to avoid a stall?Not being a pilot, I am not sure what the VREF is. Thanks for your helpKevin

[crvm 0]

look at the APP REF page for the VREF, you must CLICK THE RIGHT SIDE LSK (CDU BUTTON) next to the desired speed, Just choose the flaps 30 one ;). Better to leave the A/T ARMED with SPD DE-selected and you can control plus have stall protection like the real birdie ;) OR you can set the MCP SPD to VREF + 5 (if not windy) and the A/T will click itself off upon T/D ...[h4]Best Wishes,Randy J. Smithhttp://www.precisionmanuals.com/images/betaimg.jpg

[Guest Iz]

I have also noticed this, where the aircraft simply stalls, even at VREF. (-700 w/o winglets) I have a VREF that's 119 knots at about 45 tonnes, but I find that speed unusable because it stalls about 25-30 knots above the red/black stickshaker band on the speed tape.

[crvm 0]

I have never had this so my question Iz would be, are you using add-on weather maybe>>? I have seen AS cause the SPD to get screwy before.[h4]Best Wishes,Randy J. Smithhttp://www.precisionmanuals.com/images/betaimg.jpg

[Guest Iz]

Nope, no additional stuff, I have MS standard real-time weather with updates on.