Pilot climbed through assigned altitude by 300 ft.

Attributes
ACN	291910
Time
Date	199412
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : aoo
State Reference	PA
Altitude	msl bound lower : 5000 msl bound upper : 5300
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dab
Operator	common carrier : air taxi
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zob
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 6000 flight time type : 1000
ASRS Report	291910
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : overshoot inflight encounter : weather non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After departure from altoona, I entered overcast layer at 900 ft AGL. Shortly after entering IMC, moderate rime ice was experienced. This was the fourth buildup of rime ice within the last 2 hours (3 approachs, 1 of which was a missed at johnstown, PA, and 1 climb out at altoona). Deice boots were activated 2 to 3 times on climb out. Upon reaching the top of the overcast layer, approximately 4700 ft MSL, my attention was diverted to shedding the remaining ice, reactivating the wing boots, and re-verifying pitot and windshield deice were functioning correctly was enough to distract me to climb through 5000 ft MSL to approximately 5300 ft MSL. ATC clearance restr climb to 5000 ft. Upon noticing the error at 5300 ft immediate corrective action was taken to descend to 5000 ft. The time of this occurrence was the fifth leg of a cargo trip. The legs of the trip being XA00 pit-bed, XB15 bfd- pit XD00 pit-jst missed, XD45 jst-aoo, XF15 aoo-esn. Approachs at bfd, jst, and aoo all had moderate rime ice on descent. All legs were done single pilot part 135 IFR.

Original NASA ASRS Text

Title: PLT CLBED THROUGH ASSIGNED ALT BY 300 FT.

Narrative: AFTER DEP FROM ALTOONA, I ENTERED OVCST LAYER AT 900 FT AGL. SHORTLY AFTER ENTERING IMC, MODERATE RIME ICE WAS EXPERIENCED. THIS WAS THE FOURTH BUILDUP OF RIME ICE WITHIN THE LAST 2 HRS (3 APCHS, 1 OF WHICH WAS A MISSED AT JOHNSTOWN, PA, AND 1 CLBOUT AT ALTOONA). DEICE BOOTS WERE ACTIVATED 2 TO 3 TIMES ON CLBOUT. UPON REACHING THE TOP OF THE OVCST LAYER, APPROX 4700 FT MSL, MY ATTN WAS DIVERTED TO SHEDDING THE REMAINING ICE, REACTIVATING THE WING BOOTS, AND RE-VERIFYING PITOT AND WINDSHIELD DEICE WERE FUNCTIONING CORRECTLY WAS ENOUGH TO DISTRACT ME TO CLB THROUGH 5000 FT MSL TO APPROX 5300 FT MSL. ATC CLRNC RESTR CLB TO 5000 FT. UPON NOTICING THE ERROR AT 5300 FT IMMEDIATE CORRECTIVE ACTION WAS TAKEN TO DSND TO 5000 FT. THE TIME OF THIS OCCURRENCE WAS THE FIFTH LEG OF A CARGO TRIP. THE LEGS OF THE TRIP BEING XA00 PIT-BED, XB15 BFD- PIT XD00 PIT-JST MISSED, XD45 JST-AOO, XF15 AOO-ESN. APCHS AT BFD, JST, AND AOO ALL HAD MODERATE RIME ICE ON DSCNT. ALL LEGS WERE DONE SINGLE PLT PART 135 IFR.

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.