Altitude deviation excursion from assigned in BE58.

Attributes
ACN	343410
Time
Date	199608
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : hfd
State Reference	CT
Altitude	msl bound lower : 6700 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : elp
Operator	general aviation : corporate
Make Model Name	Baron 58/58TC
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute airway : v229
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 35 flight time total : 4800 flight time type : 950
ASRS Report	343410
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Leveled at 7000 ft nebound in VMC conditions, edo-air mitchell century iv autoplt altitude hold kicked off and aircraft descended to 6700 ft, at which time I discovered deviation and climbed back to 7000 ft. I don't have a prescription to prevent this from recurring except more attention to instrument scan. As most pilots operating single-pilot on long trips will testify, this is harder to practice than to advocate.

Original NASA ASRS Text

Title: ALTDEV EXCURSION FROM ASSIGNED IN BE58.

Narrative: LEVELED AT 7000 FT NEBOUND IN VMC CONDITIONS, EDO-AIR MITCHELL CENTURY IV AUTOPLT ALT HOLD KICKED OFF AND ACFT DSNDED TO 6700 FT, AT WHICH TIME I DISCOVERED DEV AND CLBED BACK TO 7000 FT. I DON'T HAVE A PRESCRIPTION TO PREVENT THIS FROM RECURRING EXCEPT MORE ATTN TO INST SCAN. AS MOST PLTS OPERATING SINGLE-PLT ON LONG TRIPS WILL TESTIFY, THIS IS HARDER TO PRACTICE THAN TO ADVOCATE.

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.