Altitude deviation.

Attributes
ACN	294210
Time
Date	199501
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : geg
State Reference	WA
Altitude	msl bound lower : 39000 msl bound upper : 39700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zse
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 17500 flight time type : 5000
ASRS Report	294210
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : atp pilot : flight engineer
ASRS Report	294423
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Cruising at FL390 for 2 hours. Center called at XA57Z and asked us to check our altitude. We were at 39700 ft climbing at 200 FPM. Immediately returned to 39000 ft. Autoplt engaged in command ('B' autoplt), altitude hold engaged. Had problems (previous) with #3 generator breaker. After event, had upper yaw damper warning light illuminate. Neither of above should be realted. ZSE informed us no conflict.

Original NASA ASRS Text

Title: ALTDEV.

Narrative: CRUISING AT FL390 FOR 2 HRS. CTR CALLED AT XA57Z AND ASKED US TO CHK OUR ALT. WE WERE AT 39700 FT CLBING AT 200 FPM. IMMEDIATELY RETURNED TO 39000 FT. AUTOPLT ENGAGED IN COMMAND ('B' AUTOPLT), ALT HOLD ENGAGED. HAD PROBS (PREVIOUS) WITH #3 GENERATOR BREAKER. AFTER EVENT, HAD UPPER YAW DAMPER WARNING LIGHT ILLUMINATE. NEITHER OF ABOVE SHOULD BE REALTED. ZSE INFORMED US NO CONFLICT.

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.