Air carrier flight crew reports glide slope failure during approach and transition to localizer runw...

Attributes
ACN	915536
Time
Date	201010
Local Time Of Day	0001-0600
Place
Locale Reference	RPLC.Airport
State Reference	FO
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Other Controlled
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 1400 Flight Crew Type 2500
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 14000 Flight Crew Type 6000
Events
Anomaly	Inflight Event / Encounter CFTT / CFIT

Narrative:

We were on ILS approach to rplc runway 20L. Just prior to roser autopilot started to pitch up and down. I then disconnected the autopilot to let airplane stabilize. Then we lost the glide slope and the captain reprogrammed the FMC for a localizer approach; I was in raw data hand flying. The captain became very busy with ATC; configuring the aircraft; and running checklists. At about 800 ft MSL the GPWS activated and I executed the CFIT maneuver with the go around. Then did the ILS 02R; broke out at 300 ft and had runway in sight. Lost the glide slope again at 200 ft and landed. What I should have done was to go into holding and taking more time and used automation for the approach.

Original NASA ASRS Text

Title: Air carrier flight crew reports glide slope failure during approach and transition to LOC Runway 20L at RPLC. A GPWS warning is received and the crew goes around. Approach to minimums and landing ensues on Runway 2R.

Narrative: We were on ILS approach to RPLC Runway 20L. Just prior to ROSER autopilot started to pitch up and down. I then disconnected the autopilot to let airplane stabilize. Then we lost the glide slope and the Captain reprogrammed the FMC for a LOC approach; I was in raw data hand flying. The Captain became very busy with ATC; configuring the aircraft; and running checklists. At about 800 FT MSL the GPWS activated and I executed the CFIT maneuver with the go around. Then did the ILS 02R; broke out at 300 FT and had runway in sight. Lost the glide slope again at 200 FT and landed. What I should have done was to go into holding and taking more time and used automation for the approach.

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.

Air carrier flight crew reports glide slope failure during approach and transition to localizer runway 20L at rplc. A GPWS warning is received and the crew goes around. Approach to minimums and landing ensues on runway 2R.