Flight crew of an medium large transport overshot heading on departure due to a malfunctioning capta...

Attributes
ACN	322767
Time
Date	199511
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iah
State Reference	TX
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iah
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 240 flight time total : 14000 flight time type : 1500
ASRS Report	322767
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 non adherence : published procedure other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

B737-500 EFIS aircraft. Autoplt off. Filed departure was playa ii FMS. We were assigned a heading of 250 degrees after takeoff. Our departure was in VOR/ILS captain side. Center map track-up 40 mi scale on my side. We were cleared direct to 'skuba' intersection. The captain started his turn left and after 20 seconds or so we noticed the captain side was still requiring a turn where my side said we were past a direct heading to 'skuba.' the captain went back to VOR on his RMI and corrected his heading. We advised ATC that we had over turned our heading due to navigation information error and were correcting but could not fly FMS departure. We later found out that the captain's FMS position appeared to be frozen and the wind component readout said 250 degrees at 295 KTS.

Original NASA ASRS Text

Title: FLC OF AN MLG OVERSHOT HDG ON DEP DUE TO A MALFUNCTIONING CAPT'S FMS.

Narrative: B737-500 EFIS ACFT. AUTOPLT OFF. FILED DEP WAS PLAYA II FMS. WE WERE ASSIGNED A HDG OF 250 DEGS AFTER TKOF. OUR DEP WAS IN VOR/ILS CAPT SIDE. CTR MAP TRACK-UP 40 MI SCALE ON MY SIDE. WE WERE CLRED DIRECT TO 'SKUBA' INTXN. THE CAPT STARTED HIS TURN L AND AFTER 20 SECONDS OR SO WE NOTICED THE CAPT SIDE WAS STILL REQUIRING A TURN WHERE MY SIDE SAID WE WERE PAST A DIRECT HDG TO 'SKUBA.' THE CAPT WENT BACK TO VOR ON HIS RMI AND CORRECTED HIS HDG. WE ADVISED ATC THAT WE HAD OVER TURNED OUR HDG DUE TO NAV INFO ERROR AND WERE CORRECTING BUT COULD NOT FLY FMS DEP. WE LATER FOUND OUT THAT THE CAPT'S FMS POS APPEARED TO BE FROZEN AND THE WIND COMPONENT READOUT SAID 250 DEGS AT 295 KTS.

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.

Flight crew of an medium large transport overshot heading on departure due to a malfunctioning captain's FMS.