Air carrier medium large transport track heading deviation.

Attributes
ACN	185754
Time
Date	199108
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mqp
State Reference	TX
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
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 : atp pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 11000 flight time type : 1700
ASRS Report	185754
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were given a clearance direct mqp. Captain proceeded direct with his #1 HSI. After a while center questioned us about going direct. He said we were going 20 degree away from mqp. Captain's HSI was acting strange but it still looked like to us he was going direct. Captain proceeded to jump on the controller. The controller was light, we were going away from mwp (verified on #2 navigation). Captain's navigation went inoperative with no flag. We wrote it up in iah.

Original NASA ASRS Text

Title: ACR MLG TRACK HDG DEV.

Narrative: WE WERE GIVEN A CLRNC DIRECT MQP. CAPT PROCEEDED DIRECT WITH HIS #1 HSI. AFTER A WHILE CENTER QUESTIONED US ABOUT GOING DIRECT. HE SAID WE WERE GOING 20 DEG AWAY FROM MQP. CAPT'S HSI WAS ACTING STRANGE BUT IT STILL LOOKED LIKE TO US HE WAS GOING DIRECT. CAPT PROCEEDED TO JUMP ON THE CTLR. THE CTLR WAS LIGHT, WE WERE GOING AWAY FROM MWP (VERIFIED ON #2 NAV). CAPT'S NAV WENT INOP WITH NO FLAG. WE WROTE IT UP IN IAH.

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.