<< >> NASA ASRS Report 356736, January 1997

GPWS received by flight crew in an MD80 in a night operation. Aircraft was at minimum vectoring altitude (MVA) on a radar vector. Evasive action climb executed. N90 approach controller reclrs them back to 4000 ft. States that other flts, same air carrier, have had similar events in that area. Flight crew ATC review with supervisor revealed that they were indeed on an MVA altitude that had terrain clearance authority/authorized.

Attributes
ACN	356736
Time
Date	199701
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : swf
State Reference	NY
Altitude	msl bound lower : 4000 msl bound upper : 5200
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	356736
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	356944
Events
Anomaly	other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action flight crew : declared emergency other
Consequence	faa : reviewed incident with flight crew
Supplementary
Air Traffic Incident	other

Narrative:

Time: XX00Z/ATC frequency, 132.74. ATC facility: ny approach. Location: 25 NM northwest of swf. Approximately 25 mi northwest of swf, during radar vectors from approach at 4000 ft level with autoplt on, received a GPWS terrain warning. Executed escape maneuver climbing to 5200 ft. Warning stopped once climb was initiated. Confirmed with approach that 4000 ft was minimum vectoring altitude and descended back to 4000 ft. On the ground I talked to ny approach control supervisor and he said this has occurred before in this area with other of our air carrier flts. Supplemental information from acn 356944: in IMC conditions. We got a GPWS terrain warning. Captain executed escape procedure climbed to 5200 ft and leveled. Confirmed with approach control vectoring altitude and descended back to 4000 ft. I was the PNF.

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Original NASA ASRS Text

Title: GPWS RECEIVED BY FLC IN AN MD80 IN A NIGHT OP. ACFT WAS AT MINIMUM VECTORING ALT (MVA) ON A RADAR VECTOR. EVASIVE ACTION CLB EXECUTED. N90 APCH CTLR RECLRS THEM BACK TO 4000 FT. STATES THAT OTHER FLTS, SAME ACR, HAVE HAD SIMILAR EVENTS IN THAT AREA. FLC ATC REVIEW WITH SUPVR REVEALED THAT THEY WERE INDEED ON AN MVA ALT THAT HAD TERRAIN CLRNC AUTH.

Narrative: TIME: XX00Z/ATC FREQ, 132.74. ATC FACILITY: NY APCH. LOCATION: 25 NM NW OF SWF. APPROX 25 MI NW OF SWF, DURING RADAR VECTORS FROM APCH AT 4000 FT LEVEL WITH AUTOPLT ON, RECEIVED A GPWS TERRAIN WARNING. EXECUTED ESCAPE MANEUVER CLBING TO 5200 FT. WARNING STOPPED ONCE CLB WAS INITIATED. CONFIRMED WITH APCH THAT 4000 FT WAS MINIMUM VECTORING ALT AND DSNDED BACK TO 4000 FT. ON THE GND I TALKED TO NY APCH CTL SUPVR AND HE SAID THIS HAS OCCURRED BEFORE IN THIS AREA WITH OTHER OF OUR ACR FLTS. SUPPLEMENTAL INFO FROM ACN 356944: IN IMC CONDITIONS. WE GOT A GPWS TERRAIN WARNING. CAPT EXECUTED ESCAPE PROC CLBED TO 5200 FT AND LEVELED. CONFIRMED WITH APCH CTL VECTORING ALT AND DSNDED BACK TO 4000 FT. I WAS THE PNF.

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.