Flight crew of B757 descending into mggt fail to arrest descent and receive GPWS terrain warning. Recover in VMC to complete approach.

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Attributes
ACN	622239
Time
Date	200304
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mggt.airport
State Reference	FO
Altitude	msl single value : 8500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : mggt.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : approach descent : intermediate altitude
Route In Use	approach : instrument non precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 18000 flight time type : 3000
ASRS Report	622239
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 140 flight time total : 9500 flight time type : 140
ASRS Report	622249
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure non adherence : clearance other anomaly
Independent Detector	aircraft equipment : gpws other flight crewa other flight crewb
Resolutory Action	flight crew : executed go around flight crew : overrode automation flight crew : returned to intended or assigned course flight crew : became reoriented
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Night VFR, cleared for VOR DME runway 19 approach to mggt. Landing runway changed from the expected and briefed runway 1 to VOR DME runway 19. Placed the aircraft high and fast. Vertical navigation deselected opting for flight level change, vertical mode with drag applied to meet the new criteria while the new runway briefed and inserted into the FMC. The inbound course was intercepted while still descending, but we failed to reengage the VNAV path which led to a greater than anticipated rate of descent, causing a momentary (less than one second) incomplete terrain warning. Go around was initiated, however, the warning was arrested immediately and the approach continued since we were in visual conditions and in sight of the runway. Supplemental information from can 622249: I started to go around and the warning stopped. The captain had the runway in sight so told me to continue the approach.

Original NASA ASRS Text

Title: FLT CREW OF B757 DSNDING INTO MGGT FAIL TO ARREST DSCNT AND RECEIVE GPWS TERRAIN WARNING. RECOVER IN VMC TO COMPLETE APCH.

Narrative: NIGHT VFR, CLRED FOR VOR DME RWY 19 APCH TO MGGT. LNDG RWY CHANGED FROM THE EXPECTED AND BRIEFED RWY 1 TO VOR DME RWY 19. PLACED THE ACFT HIGH AND FAST. VERT NAV DESELECTED OPTING FOR FLT LEVEL CHANGE, VERT MODE WITH DRAG APPLIED TO MEET THE NEW CRITERIA WHILE THE NEW RWY BRIEFED AND INSERTED INTO THE FMC. THE INBOUND COURSE WAS INTERCEPTED WHILE STILL DSNDING, BUT WE FAILED TO REENGAGE THE VNAV PATH WHICH LED TO A GREATER THAN ANTICIPATED RATE OF DSCNT, CAUSING A MOMENTARY (LESS THAN ONE SECOND) INCOMPLETE TERRAIN WARNING. GAR WAS INITIATED, HOWEVER, THE WARNING WAS ARRESTED IMMEDIATELY AND THE APCH CONTINUED SINCE WE WERE IN VISUAL CONDITIONS AND IN SIGHT OF THE RWY. SUPPLEMENTAL INFO FROM CAN 622249: I STARTED TO GO AROUND AND THE WARNING STOPPED. THE CAPT HAD THE RWY IN SIGHT SO TOLD ME TO CONTINUE THE APCH.

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.