B747 flight crew report on descent below glideslope; cftt incident during approach to rksi.

Attributes
ACN	842437
Time
Date	200906
Local Time Of Day	0001-0600
Place
Locale Reference	RKSI.Airport
State Reference	FO
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	Final Approach Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Autopilot
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 37 Flight Crew Total 13326 Flight Crew Type 2237
Person 2
Function	Relief Pilot Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Experience	Flight Crew Last 90 Days 400 Flight Crew Total 12000 Flight Crew Type 3500
Events
Anomaly	Inflight Event / Encounter CFTT / CFIT Inflight Event / Encounter Unstabilized Approach

Narrative:

Rksi was reporting 1600-1800 RVR with CAT ii approaches in use. The captain was to do the approach to the ILS DME 'Y' runway 15L CAT ii&III using the autopilot to an autoland. The approach had us cross danan at 5000 ft then descend to cross juinn at 2600 ft. Then to down to 1600 ft for glideslope intercept altitude. We flew as published until we were on the localizer all was normal; 1600 was set in the altitude alert window; and the glideslope had not yet come alive. Approach told us to contact the tower; while I had my head down to switch frequencies; all of a sudden I hear the third pilot yell 'glide path'. I looked up to see us descending with the glideslope indicator full up deflection. I said 'pull up' 'go around.' immediately we got 'terrain' 'terrain' followed shortly by 'too low terain' 'too low terain' on the GPWS. I again said; 'pull up; get it up now'. All this happened very quickly; there was no slow gradual decent; or slow deviation from profile. One moment all was normal then all hell was breaking loose. With us now climbing; I asked about selecting flaps 20 and the for the gear to be raised. The third pilot was calling for the same thing only louder; and he called for moving the speed bug up because the toga button had never been pushed. I told the tower 'we're going around.' we were now about 900ft and I asked 'do you want LNAV & VNAV'? The captain said yes; so I selected LNAV & VNAV. I now noticed we were heading far to the right of course; and asked; 'where are we going?' 'we need to turn left and get back on course. During this the tower asked for the missed approach. I said 'glideslope.' as we are turning back the tower asked 'say heading' I told them we are turning back to course. She said 'never mind' 'fly present heading; which was 190. She then said 'say intentions' I told her 'we would like vectors back for another approach.' we did so to a normal landing.

Original NASA ASRS Text

Title: B747 flight crew report on descent below glideslope; CFTT incident during approach to RKSI.

Narrative: RKSI was reporting 1600-1800 RVR with CAT II approaches in use. The Captain was to do the approach to the ILS DME 'Y' Runway 15L CAT II&III using the autopilot to an autoland. The approach had us cross DANAN at 5000 FT then descend to cross JUINN at 2600 FT. Then to down to 1600 FT for glideslope intercept altitude. We flew as published until we were on the localizer all was normal; 1600 was set in the altitude alert window; and the glideslope had not yet come alive. Approach told us to contact the tower; while I had my head down to switch frequencies; all of a sudden I hear the third pilot yell 'Glide path'. I looked up to see us descending with the glideslope indicator full up deflection. I said 'Pull up' 'Go Around.' Immediately we got 'TERRAIN' 'TERRAIN' followed shortly by 'TOO LOW TERAIN' 'TOO LOW TERAIN' on the GPWS. I again said; 'Pull up; Get it UP Now'. All this happened very quickly; there was no slow gradual decent; or slow deviation from profile. One moment all was normal then all hell was breaking loose. With us now climbing; I asked about selecting Flaps 20 and the for the gear to be raised. The third pilot was calling for the same thing only louder; and he called for moving the speed bug up because the TOGA button had never been pushed. I told the tower 'we're going around.' We were now about 900ft and I asked 'do you want LNAV & VNAV'? The Captain said yes; so I selected LNAV & VNAV. I now noticed we were heading far to the right of course; and asked; 'Where are we going?' 'We need to turn left and get back on course. During this the tower asked for the missed approach. I said 'glideslope.' As we are turning back the tower asked 'Say Heading' I told them we are turning back to course. She said 'never mind' 'Fly present heading; which was 190. She then said 'Say Intentions' I told her 'We would like vectors back for another approach.' we did so to a normal landing.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.