<< >> NASA ASRS Report 322446, December 1995

Flight crew deviated from ATC assigned heading. Autoplt turned toward LNAV course after heading hold was selected. Heading deviation was detected by ATC.

Attributes
ACN	322446
Time
Date	199512
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mxe
State Reference	PA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zny
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 11500 flight time type : 1500
ASRS Report	322446
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 20000 flight time type : 1000
ASRS Report	322350
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ATC assigned heading, and heading hold was selected. Autoplt captured LNAV course and began turn. ATC asked about turn. We corrected to assigned heading. He then cleared us to mxe. Supplemental information from acn 322350: ATC told to hold current heading. In autoplt mode selected heading hold. However, autoplt captured LNAV mode and started a turn -- center called and we corrected back. Cavu, no traffic conflict, safety not a consideration, and nothing on TCASII. It was inadvertent and unintentional.

Related reports:

• Air carrier flight crew deviated from climb to respond to TC...
• A flight crew deviated right to stay upwind of weather; but ...
• Pilot deviation -- air carrier a deviated from assigned alti...
• A B777 deviated from their assigned route because of weather...
• Flight crew deviated for WX when only given heading for devi...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: FLC DEVIATED FROM ATC ASSIGNED HEADING. AUTOPLT TURNED TOWARD LNAV COURSE AFTER HEADING HOLD WAS SELECTED. HEADING DEV WAS DETECTED BY ATC.

Narrative: ATC ASSIGNED HEADING, AND HEADING HOLD WAS SELECTED. AUTOPLT CAPTURED LNAV COURSE AND BEGAN TURN. ATC ASKED ABOUT TURN. WE CORRECTED TO ASSIGNED HEADING. HE THEN CLRED US TO MXE. SUPPLEMENTAL INFO FROM ACN 322350: ATC TOLD TO HOLD CURRENT HEADING. IN AUTOPLT MODE SELECTED HEADING HOLD. HOWEVER, AUTOPLT CAPTURED LNAV MODE AND STARTED A TURN -- CTR CALLED AND WE CORRECTED BACK. CAVU, NO TFC CONFLICT, SAFETY NOT A CONSIDERATION, AND NOTHING ON TCASII. IT WAS INADVERTENT AND UNINTENTIONAL.

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.