Air carrier large transport gross navigation error caribbean.

Attributes
ACN	98415
Time
Date	198811
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ddp
State Reference	PR
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : atlantic enroute airway : a300 enroute airway : a23
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 20000
ASRS Report	98415
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight # jfk-stt, 11/88 cleared A-300 jfk-ddp, large transport aircraft single ONS positions entered correctly and plotting map/flight plan entries all correct and positions plotted. Right on. At 'lennt (172 north of ddp) san juan center contacted and flight advised it was approximately 60 NM east of course near 'thank' int. We quickly checked all positions. Only error was a 'false wind' was in ONS for approximately 1 1/2 hours (showed approximately 120/129 degree). This was giving us a false drift correction and a/C was left of course, but plotting on course. Wind had corrected itself by lennt and read from 295/20 degree. On this ONS no way to insert winds like INS. In hindsight with such an erroneous wind we should have called position doubtful and dr to ddp.

Original NASA ASRS Text

Title: ACR LGT GROSS NAVIGATION ERROR CARIBBEAN.

Narrative: FLT # JFK-STT, 11/88 CLRED A-300 JFK-DDP, LGT ACFT SINGLE ONS POSITIONS ENTERED CORRECTLY AND PLOTTING MAP/FLT PLAN ENTRIES ALL CORRECT AND POSITIONS PLOTTED. RIGHT ON. AT 'LENNT (172 NORTH OF DDP) SAN JUAN CTR CONTACTED AND FLT ADVISED IT WAS APPROX 60 NM EAST OF COURSE NEAR 'THANK' INT. WE QUICKLY CHECKED ALL POSITIONS. ONLY ERROR WAS A 'FALSE WIND' WAS IN ONS FOR APPROX 1 1/2 HRS (SHOWED APPROX 120/129 DEG). THIS WAS GIVING US A FALSE DRIFT CORRECTION AND A/C WAS LEFT OF COURSE, BUT PLOTTING ON COURSE. WIND HAD CORRECTED ITSELF BY LENNT AND READ FROM 295/20 DEG. ON THIS ONS NO WAY TO INSERT WINDS LIKE INS. IN HINDSIGHT WITH SUCH AN ERRONEOUS WIND WE SHOULD HAVE CALLED POSITION DOUBTFUL AND DR TO DDP.

Data retrieved from NASA's ASRS site as of August 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.