<< >> NASA ASRS Report 558705, August 2002

An MD80 crew, departing mexico city, (MMMX) observed that the 'gfms' route as flown deviated from the route as depicted on the published departure chart.

Attributes
ACN	558705
Time
Date	200208
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mmex.airport
State Reference	FO
Altitude	msl single value : 9000
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	oversight : pic
Qualification	pilot : atp
ASRS Report	558705
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance non adherence : published procedure other anomaly other other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : returned to intended or assigned course flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

While flying the tulsas 1A department from mex, we found that the gfms route differed from raw data on one leg. The second segment of the procedure, intercepting the positive control area R194 into positive control area was depicted several miles east of the actual VOR radial. We flew the raw data which subsequently rejoined the gfms route after the positive control area radial. Callback conversation with reporter revealed the following information: reporter revealed, a subsequent trip into MMMX, with a different aircraft same type, produced the same results. Company's vague response to his report implied the gfms routing was correct while the chart depiction is wrong. Reporter is expecting more information to be forthcoming as company continues to investigate the matter.

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Original NASA ASRS Text

Title: AN MD80 CREW, DEPARTING MEXICO CITY, (MMMX) OBSERVED THAT THE 'GFMS' RTE AS FLOWN DEVIATED FROM THE RTE AS DEPICTED ON THE PUBLISHED DEP CHART.

Narrative: WHILE FLYING THE TULSAS 1A DEPT FROM MEX, WE FOUND THAT THE GFMS RTE DIFFERED FROM RAW DATA ON ONE LEG. THE SEC SEGMENT OF THE PROC, INTERCEPTING THE PCA R194 INTO PCA WAS DEPICTED SEVERAL MILES E OF THE ACTUAL VOR RADIAL. WE FLEW THE RAW DATA WHICH SUBSEQUENTLY REJOINED THE GFMS RTE AFTER THE PCA RADIAL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR REVEALED, A SUBSEQUENT TRIP INTO MMMX, WITH A DIFFERENT ACFT SAME TYPE, PRODUCED THE SAME RESULTS. COMPANY'S VAGUE RESPONSE TO HIS RPT IMPLIED THE GFMS ROUTING WAS CORRECT WHILE THE CHART DEPICTION IS WRONG. RPTR IS EXPECTING MORE INFO TO BE FORTHCOMING AS COMPANY CONTINUES TO INVESTIGATE THE MATTER.

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.