The flight crew deviated 300 ft from assigned altitude.

Attributes
ACN	317110
Time
Date	199509
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zob
State Reference	OH
Altitude	msl bound lower : 35000 msl bound upper : 35300
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	317110
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

At FL350 in level cruise over eck XA09Z on ZOB frequency 133.87. First officer was out of cockpit. Aircraft made an uncommanded climb. Autoplt was disengaged and climb was stopped. Aircraft reached 35300 ft. 2 seconds before the climb autothrottles commanded maximum cruise thrust, EPR indicator fault alert displayed. There were 2 other write-ups for the same malfunction in the last 2 days. Both on autoplt #2. ATC said there was no conflict and did notice the deviation. They said they were not going to take any action. Autoplt and autothrottles were written up.

Original NASA ASRS Text

Title: THE FLC DEVIATED 300 FT FROM ASSIGNED ALT.

Narrative: AT FL350 IN LEVEL CRUISE OVER ECK XA09Z ON ZOB FREQ 133.87. FO WAS OUT OF COCKPIT. ACFT MADE AN UNCOMMANDED CLB. AUTOPLT WAS DISENGAGED AND CLB WAS STOPPED. ACFT REACHED 35300 FT. 2 SECONDS BEFORE THE CLB AUTOTHROTTLES COMMANDED MAX CRUISE THRUST, EPR INDICATOR FAULT ALERT DISPLAYED. THERE WERE 2 OTHER WRITE-UPS FOR THE SAME MALFUNCTION IN THE LAST 2 DAYS. BOTH ON AUTOPLT #2. ATC SAID THERE WAS NO CONFLICT AND DID NOTICE THE DEV. THEY SAID THEY WERE NOT GOING TO TAKE ANY ACTION. AUTOPLT AND AUTOTHROTTLES WERE WRITTEN UP.

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.