Large transport on arrival route has navigation move from LNAV to heading select mode.

Attributes
ACN	268255
Time
Date	199404
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : okk
State Reference	IN
Altitude	msl bound lower : 18000 msl bound upper : 18000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau tower : fll
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 2000
ASRS Report	268255
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe 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	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

On apr/94 while the captain of flight from mia to ord in a glass equipped B-757, a possible airspace violation may have occurred. We were navigating on the knox arrival to ord when the controller asked, 'air carrier are you following the knox arrival?'. I looked up at the ADI and to my disbelief, we were somehow out of LNAV and into heading select mode. I quickly checked our position relative to course and found that we were less than 2 NM off course. So I don't think we violated any airspace, but can't say for sure. Went back to left navigation and on course. Controller made a comment that the MOA to our left was hot.

Original NASA ASRS Text

Title: LGT ON ARR RTE HAS NAV MOVE FROM LNAV TO HDG SELECT MODE.

Narrative: ON APR/94 WHILE THE CAPT OF FLT FROM MIA TO ORD IN A GLASS EQUIPPED B-757, A POSSIBLE AIRSPACE VIOLATION MAY HAVE OCCURRED. WE WERE NAVING ON THE KNOX ARR TO ORD WHEN THE CTLR ASKED, 'ACR ARE YOU FOLLOWING THE KNOX ARR?'. I LOOKED UP AT THE ADI AND TO MY DISBELIEF, WE WERE SOMEHOW OUT OF LNAV AND INTO HDG SELECT MODE. I QUICKLY CHKED OUR POS RELATIVE TO COURSE AND FOUND THAT WE WERE LESS THAN 2 NM OFF COURSE. SO I DON'T THINK WE VIOLATED ANY AIRSPACE, BUT CAN'T SAY FOR SURE. WENT BACK TO L NAV AND ON COURSE. CTLR MADE A COMMENT THAT THE MOA TO OUR L WAS HOT.

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.