<< >> NASA ASRS Report 300470, March 1995

Track deviation.

Attributes
ACN	300470
Time
Date	199503
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : djb
State Reference	OH
Altitude	msl bound lower : 25000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 70 flight time total : 4900 flight time type : 2000
ASRS Report	300470
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 180 flight time total : 17000 flight time type : 500
ASRS Report	301354
Events
Anomaly	aircraft equipment problem : less severe conflict : airborne less severe inflight encounter other non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

After encountering moderate and occasionally severe turbulence at FL270, we descended to FL250. Shortly thereafter, we were told to come left to a 070 degree heading. During the turbulence, our autoplt had been knocked off of omega to manual. The resulting lack of course following put us in conflict with another aircraft and off course. Supplemental information from acn 301354: the omega switch disengaged causing us to overshoot new course. Reengaging omega caused us to correct back to course and aircraft behind came within 10 NM.

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Original NASA ASRS Text

Title: TRACK DEV.

Narrative: AFTER ENCOUNTERING MODERATE AND OCCASIONALLY SEVERE TURB AT FL270, WE DSNDED TO FL250. SHORTLY THEREAFTER, WE WERE TOLD TO COME L TO A 070 DEG HDG. DURING THE TURB, OUR AUTOPLT HAD BEEN KNOCKED OFF OF OMEGA TO MANUAL. THE RESULTING LACK OF COURSE FOLLOWING PUT US IN CONFLICT WITH ANOTHER ACFT AND OFF COURSE. SUPPLEMENTAL INFO FROM ACN 301354: THE OMEGA SWITCH DISENGAGED CAUSING US TO OVERSHOOT NEW COURSE. REENGAGING OMEGA CAUSED US TO CORRECT BACK TO COURSE AND ACFT BEHIND CAME WITHIN 10 NM.

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.