<< >> NASA ASRS Report 481580, August 2000

An S80 flight crew gets off course southwest of cuw NDB and is corrected by center controller at mmzt, first officer,

Attributes
ACN	481580
Time
Date	200008
Day	Sat
Local Time Of Day	1201 To 1800
Place
State Reference	FO
Altitude	msl single value : 35000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : mmzt.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	other ndb
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	481580
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued advisory controller : issued new clearance
Consequence	Other
Supplementary
Problem Areas	Company Flight Crew Human Performance Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Location: UJ8 between cuw and chx. En route, approximately 80 NM south of cuw (chihuahua NDB), mazatlan center asked us if we knew where we were. They said we were off course approximately 23 NM to the south of UJ8 between the cuw NDB and the chx (choix) NDB. We were on our way to cabo san lucas. According to us, we were right on the 217 degree bearing out of cuw. Center gave us heading to go direct to chx NDB. We were using cuw because before that time chx was not coming in. Once on center's heading for chx, we tuned in chx and it did show us south of course. Since we did not have a gfms there was no way to confirm how much off course we were. On the way back to dfw we did notice how unreliable both the chx and cuw NDB's were for navigation.

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Original NASA ASRS Text

Title: AN S80 FLC GETS OFF COURSE SW OF CUW NDB AND IS CORRECTED BY CTR CTLR AT MMZT, FO,

Narrative: LOCATION: UJ8 BTWN CUW AND CHX. ENRTE, APPROX 80 NM S OF CUW (CHIHUAHUA NDB), MAZATLAN CTR ASKED US IF WE KNEW WHERE WE WERE. THEY SAID WE WERE OFF COURSE APPROX 23 NM TO THE S OF UJ8 BTWN THE CUW NDB AND THE CHX (CHOIX) NDB. WE WERE ON OUR WAY TO CABO SAN LUCAS. ACCORDING TO US, WE WERE RIGHT ON THE 217 DEG BEARING OUT OF CUW. CTR GAVE US HDG TO GO DIRECT TO CHX NDB. WE WERE USING CUW BECAUSE BEFORE THAT TIME CHX WAS NOT COMING IN. ONCE ON CTR'S HDG FOR CHX, WE TUNED IN CHX AND IT DID SHOW US S OF COURSE. SINCE WE DID NOT HAVE A GFMS THERE WAS NO WAY TO CONFIRM HOW MUCH OFF COURSE WE WERE. ON THE WAY BACK TO DFW WE DID NOTICE HOW UNRELIABLE BOTH THE CHX AND CUW NDB'S WERE FOR NAV.

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.