B737-300 crew had altitude excursion in ZLA class a.

Attributes
ACN	520192
Time
Date	200108
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zla.artcc
State Reference	CA
Altitude	msl bound lower : 29000 msl bound upper : 29400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	cruise : level
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 8700 flight time type : 500
ASRS Report	520192
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : radar aircraft equipment : altitude alert other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Stabilizer trim failure. While cruising at FL290, the captain was flying to bur, 15 mi northwest of ave VOR, the stabilizer out of trim light came on. While getting out the checklist, the captain disconnected the autoplt per the manual (QRH) the aircraft climbed to 29400 ft. ZLA called us about our altitude. I, the first officer, said we're having a problem and were returning to FL290. The flight continued normally to burbank.

Original NASA ASRS Text

Title: B737-300 CREW HAD ALT EXCURSION IN ZLA CLASS A.

Narrative: STABILIZER TRIM FAILURE. WHILE CRUISING AT FL290, THE CAPT WAS FLYING TO BUR, 15 MI NW OF AVE VOR, THE STABILIZER OUT OF TRIM LIGHT CAME ON. WHILE GETTING OUT THE CHKLIST, THE CAPT DISCONNECTED THE AUTOPLT PER THE MANUAL (QRH) THE ACFT CLBED TO 29400 FT. ZLA CALLED US ABOUT OUR ALT. I, THE FO, SAID WE'RE HAVING A PROB AND WERE RETURNING TO FL290. THE FLT CONTINUED NORMALLY TO BURBANK.

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.