Altitude deviation altitude excursion.

Attributes
ACN	302170
Time
Date	199504
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : aml airport : iad
State Reference	VA
Altitude	msl bound lower : 4750 msl bound upper : 5000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iad tower : fll
Operator	common carrier : air carrier
Make Model Name	Jetstream 32
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 1400 flight time type : 200
ASRS Report	302170
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 3500 flight time type : 200
ASRS Report	302029
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On our return flight from columbus, oh, we arrived at dulles during a busy arrival bank. Dulles only had arrs to runway 1R (if I remember correctly). While at 5000 ft, we were given a speed restr. During our flight through some light turbulence and in and out of clouds, the captain noticed I had lost 200 ft. During my correction time, we had descended to about 250 ft below our assigned altitude. ATC asked if we were maintaining 5000 ft. ATC quickly acknowledged our return to altitude. Supplemental information from acn 302029: I was busy with PNF duties and first officer was flying through partial VMC/IMC clouds.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION.

Narrative: ON OUR RETURN FLT FROM COLUMBUS, OH, WE ARRIVED AT DULLES DURING A BUSY ARR BANK. DULLES ONLY HAD ARRS TO RWY 1R (IF I REMEMBER CORRECTLY). WHILE AT 5000 FT, WE WERE GIVEN A SPD RESTR. DURING OUR FLT THROUGH SOME LIGHT TURB AND IN AND OUT OF CLOUDS, THE CAPT NOTICED I HAD LOST 200 FT. DURING MY CORRECTION TIME, WE HAD DSNDED TO ABOUT 250 FT BELOW OUR ASSIGNED ALT. ATC ASKED IF WE WERE MAINTAINING 5000 FT. ATC QUICKLY ACKNOWLEDGED OUR RETURN TO ALT. SUPPLEMENTAL INFO FROM ACN 302029: I WAS BUSY WITH PNF DUTIES AND FO WAS FLYING THROUGH PARTIAL VMC/IMC CLOUDS.

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.