An air carrier medium large transport climbed in response to a GPWS terrain warning.

Attributes
ACN	252432
Time
Date	199309
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : abq
State Reference	NM
Altitude	msl bound lower : 8000 msl bound upper : 8300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : abq
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9000
ASRS Report	252432
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Descending from 8400 MSL to 7400 MSL south of abq, night VMC. Field in sight and cleared right turn and descent to 7400 MSL to turn final to runway 35. At 8000 MSL, GPWS gave us 'terrain, terrain' call. We immediately initiated a straight climb to 8300 ft MSL, noting our radio altimeters had registered 600 ft AGL. We maintained 8300 ft northbound toward field and advised approach control. ATC confirmed MSA and MVA and also noted that another air carrier earlier had reported a similar GPWS event although well clear of terrain. At 8300 ft MSL and 1 mi south of the field itself (level flight) we received another GPWS 'terrain, terrain' command and radio altimeters were descending through 600 ft AGL. We advised tower of the second event. The aircraft equipment checked normal, suspect possibility of outside interference (from kirtland air force base?) with radio altimeter frequencys.

Original NASA ASRS Text

Title: AN ACR MLG CLBED IN RESPONSE TO A GPWS TERRAIN WARNING.

Narrative: DSNDING FROM 8400 MSL TO 7400 MSL S OF ABQ, NIGHT VMC. FIELD IN SIGHT AND CLRED R TURN AND DSCNT TO 7400 MSL TO TURN FINAL TO RWY 35. AT 8000 MSL, GPWS GAVE US 'TERRAIN, TERRAIN' CALL. WE IMMEDIATELY INITIATED A STRAIGHT CLB TO 8300 FT MSL, NOTING OUR RADIO ALTIMETERS HAD REGISTERED 600 FT AGL. WE MAINTAINED 8300 FT NBOUND TOWARD FIELD AND ADVISED APCH CTL. ATC CONFIRMED MSA AND MVA AND ALSO NOTED THAT ANOTHER ACR EARLIER HAD RPTED A SIMILAR GPWS EVENT ALTHOUGH WELL CLR OF TERRAIN. AT 8300 FT MSL AND 1 MI S OF THE FIELD ITSELF (LEVEL FLT) WE RECEIVED ANOTHER GPWS 'TERRAIN, TERRAIN' COMMAND AND RADIO ALTIMETERS WERE DSNDING THROUGH 600 FT AGL. WE ADVISED TWR OF THE SECOND EVENT. THE ACFT EQUIP CHKED NORMAL, SUSPECT POSSIBILITY OF OUTSIDE INTERFERENCE (FROM KIRTLAND AIR FORCE BASE?) WITH RADIO ALTIMETER FREQS.

Data retrieved from NASA's ASRS site as of July 2007 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.