B737-800 flight crew approaching tomas intersection at 8;000 ft arriving mroc in IMC receives an egp...

Attributes
ACN	1009131
Time
Date	201205
Local Time Of Day	1201-1800
Place
Locale Reference	MROC.Airport
State Reference	FO
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	GPWS
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence

Narrative:

We were cleared for the ILS DME runway 07 at mroc and cleared to descend to 7;000 ft on the localizer. About 20 NM from the airport inside lopez descending through 9;000 just about to intercept the glideslope; we received an aural warning; from egpws; terrain; terrain; terrain; pull up. We were in weather IMC and rain showers; so the first officer; immediately performed the escape maneuver; and the warning ceased immediately. We requested a right turn to avoid thunderstorm buildup to the north and climbed initially to 12;000 ft then recleared to 14;000. We were vectored in sequence for another approach with no warning on the second approach. The minimum vectoring altitude where we were; based on raw data was 6;000 ft.

Original NASA ASRS Text

Title: B737-800 flight crew approaching TOMAS Intersection at 8;000 FT arriving MROC in IMC receives an EGPWS terrain warning and executes the escape maneuver. A second approach flown in a similar manor produces no warning.

Narrative: We were cleared for the ILS DME Runway 07 at MROC and cleared to descend to 7;000 FT on the LOC. About 20 NM from the airport inside LOPEZ descending through 9;000 just about to intercept the glideslope; we received an AURAL WARNING; from EGPWS; TERRAIN; TERRAIN; TERRAIN; PULL UP. We were in weather IMC and rain showers; so the First Officer; immediately performed the escape maneuver; and the warning ceased immediately. We requested a right turn to avoid thunderstorm buildup to the north and climbed initially to 12;000 FT then recleared to 14;000. We were vectored in sequence for another approach with no warning on the second approach. The minimum vectoring altitude where we were; based on raw data was 6;000 FT.

Data retrieved from NASA's ASRS site as of July 2013 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.

B737-800 flight crew approaching tomas intersection at 8;000 ft arriving mroc in IMC receives an egpws terrain warning and executes the escape maneuver. A second approach flown in a similar manor produces no warning.