<< >> NASA ASRS Report 382497, October 1997

An air carrier B757 flight crew encountered a thunderstorm during a STAR to mex. They had heavy precipitation and a GPWS terrain warning accompanied by a smell of electrical smoke. The flight crew performed an escape maneuver recovered and continued for a successful landing.

Attributes
ACN	382497
Time
Date	199710
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pca airport : mex
State Reference	FO
Altitude	msl bound lower : 12000 msl bound upper : 15500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mex
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	382497
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	382496
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course flight crew : declared emergency
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other

Narrative:

Crossed positive control area VOR at 14000 ft, lunas 1, for runway 23L. On 150 degree radial from positive control area, then direct otu VOR, got descend to 12000 ft from mex approach. Approximately XA05 UTC, hit a thunderstorm with heavy precipitation accompanied by the smell of electrical smoke. Then ground proximity warning sounded, 'terrain, terrain.' captain initiated escape maneuver. He climbed to 15500 ft and called ATC, no conflict and no conflict on the TCASII either. At 15500 ft terrain warning stopped, we cleared the thunderstorm, regained VMC conditions, descended to 12000 ft and continued the approach for runway 23L with a transition to runway 23R. Warning and smell of electrical smoke entered in E6.

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Original NASA ASRS Text

Title: AN ACR B757 FLC ENCOUNTERED A TSTM DURING A STAR TO MEX. THEY HAD HVY PRECIPITATION AND A GPWS TERRAIN WARNING ACCOMPANIED BY A SMELL OF ELECTRICAL SMOKE. THE FLC PERFORMED AN ESCAPE MANEUVER RECOVERED AND CONTINUED FOR A SUCCESSFUL LNDG.

Narrative: CROSSED PCA VOR AT 14000 FT, LUNAS 1, FOR RWY 23L. ON 150 DEG RADIAL FROM PCA, THEN DIRECT OTU VOR, GOT DSND TO 12000 FT FROM MEX APCH. APPROX XA05 UTC, HIT A TSTM WITH HVY PRECIPITATION ACCOMPANIED BY THE SMELL OF ELECTRICAL SMOKE. THEN GND PROX WARNING SOUNDED, 'TERRAIN, TERRAIN.' CAPT INITIATED ESCAPE MANEUVER. HE CLBED TO 15500 FT AND CALLED ATC, NO CONFLICT AND NO CONFLICT ON THE TCASII EITHER. AT 15500 FT TERRAIN WARNING STOPPED, WE CLRED THE TSTM, REGAINED VMC CONDITIONS, DSNDED TO 12000 FT AND CONTINUED THE APCH FOR RWY 23L WITH A TRANSITION TO RWY 23R. WARNING AND SMELL OF ELECTRICAL SMOKE ENTERED IN E6.

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.