Temporary loss of aircraft control, altitude deviation altitude excursion.

Attributes
ACN	292453
Time
Date	199412
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zny
State Reference	NY
Altitude	msl bound lower : 16000 msl bound upper : 16000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute airway : zny
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time total : 3300
ASRS Report	292453
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

1 engine suddenly seemed to lose all power, then start up again, then lose all power, then start up again -- over and over again -- all very quickly. Airplane lurched left and right strongly, over and over again. Autoplt disconnected itself, took a couple of mins to decide to turn off engine computers and fly with engines on 'manual mode.' problem subsided, lurching stopped, immediately noticed airplane had gained 600 ft, probably because of my hands on controls to counteract lurching problem. Returned to correct altitude, informed ATC of problem, and that stability had been regained, and a few mins later landed at destination, otherwise uneventfully.

Original NASA ASRS Text

Title: TEMPORARY LOSS OF ACFT CTL, ALTDEV ALT EXCURSION.

Narrative: 1 ENG SUDDENLY SEEMED TO LOSE ALL PWR, THEN START UP AGAIN, THEN LOSE ALL PWR, THEN START UP AGAIN -- OVER AND OVER AGAIN -- ALL VERY QUICKLY. AIRPLANE LURCHED L AND R STRONGLY, OVER AND OVER AGAIN. AUTOPLT DISCONNECTED ITSELF, TOOK A COUPLE OF MINS TO DECIDE TO TURN OFF ENG COMPUTERS AND FLY WITH ENGS ON 'MANUAL MODE.' PROB SUBSIDED, LURCHING STOPPED, IMMEDIATELY NOTICED AIRPLANE HAD GAINED 600 FT, PROBABLY BECAUSE OF MY HANDS ON CTLS TO COUNTERACT LURCHING PROB. RETURNED TO CORRECT ALT, INFORMED ATC OF PROB, AND THAT STABILITY HAD BEEN REGAINED, AND A FEW MINS LATER LANDED AT DEST, OTHERWISE UNEVENTFULLY.

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.