Flight crew of air carrier large transport aircraft deviated from assigned course and altitude to avoid a line of thunderstorms on an oceanic route.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	231254
Time
Date	199301
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : chs
State Reference	SC
Altitude	msl bound lower : 37000 msl bound upper : 37500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny6
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : atlantic enroute : other oceanic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 16000 flight time type : 700
ASRS Report	231254
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 40 flight time total : 10500 flight time type : 270
ASRS Report	231725
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : exited adverse environment flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Weather

Narrative:

While in cruise at FL370 visually and on radar confirmed a line of severe WX approximately 150-200 NM wide over jesse intersection, tops varied up to FL410. Notified ny commercial radio on HF that we needed a right turn to avoid WX and requested 80 NM west of course and FL390 to avoid. At 40 NM from WX, again requested right turn and climb immediately. At 20 NM from WX, we notified ATC (ny commercial radio) that we were turning right off course and climbing 500 ft to FL375. At this point, turbulence was moderate and increasing. After paralleling line of severe WX for approximately 20 NM, radar showed a path to jesse was available off our left wing. We notified ny commercial radio that we were turning direct jesse (our cleared fix) and were descending back to 370 when on course again. We passed over jesse within 2 mins of our estimate in our last position report, descended to FL370 and verified with ATC that we were back on course and level FL370.

Original NASA ASRS Text

Title: FLC OF ACR LGT ACFT DEVIATED FROM ASSIGNED COURSE AND ALT TO AVOID A LINE OF TSTMS ON AN OCEANIC RTE.

Narrative: WHILE IN CRUISE AT FL370 VISUALLY AND ON RADAR CONFIRMED A LINE OF SEVERE WX APPROX 150-200 NM WIDE OVER JESSE INTXN, TOPS VARIED UP TO FL410. NOTIFIED NY COMMERCIAL RADIO ON HF THAT WE NEEDED A R TURN TO AVOID WX AND REQUESTED 80 NM W OF COURSE AND FL390 TO AVOID. AT 40 NM FROM WX, AGAIN REQUESTED R TURN AND CLB IMMEDIATELY. AT 20 NM FROM WX, WE NOTIFIED ATC (NY COMMERCIAL RADIO) THAT WE WERE TURNING R OFF COURSE AND CLBING 500 FT TO FL375. AT THIS POINT, TURB WAS MODERATE AND INCREASING. AFTER PARALLELING LINE OF SEVERE WX FOR APPROX 20 NM, RADAR SHOWED A PATH TO JESSE WAS AVAILABLE OFF OUR L WING. WE NOTIFIED NY COMMERCIAL RADIO THAT WE WERE TURNING DIRECT JESSE (OUR CLRED FIX) AND WERE DSNDING BACK TO 370 WHEN ON COURSE AGAIN. WE PASSED OVER JESSE WITHIN 2 MINS OF OUR ESTIMATE IN OUR LAST POS RPT, DSNDED TO FL370 AND VERIFIED WITH ATC THAT WE WERE BACK ON COURSE AND LEVEL FL370.

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.