Overshot altitude on climb-out resulting in less than standard separation.

Attributes
ACN	174647
Time
Date	199104
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : czq airport : fat
State Reference	CA
Altitude	msl bound lower : 10000 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : v23
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 5000 flight time type : 200
ASRS Report	174647
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance non adherence : required legal separation
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course other
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During climb out from fat, assigned 10000' by ZOA for opp direction traffic at 11000' (small aircraft Y aircraft). This particular aircraft is one in the fleet that does not have altitude alerting instruments. Approaching 10000', I was distracted inside (pressure problem) the cockpit momentarily. I then realized I passed through my altitude and by 10500' I had started back down to 10000'. We never saw the small aircraft Y and no evasive action had to be taken. Center then reconfirmed my altitude and requested I call them on the ground. Center said the aircraft were 4 mi apart horizontal and 500' vertical at the closest point.

Original NASA ASRS Text

Title: OVERSHOT ALT ON CLIMB-OUT RESULTING IN LESS THAN STANDARD SEPARATION.

Narrative: DURING CLBOUT FROM FAT, ASSIGNED 10000' BY ZOA FOR OPP DIRECTION TFC AT 11000' (SMA Y ACFT). THIS PARTICULAR ACFT IS ONE IN THE FLEET THAT DOES NOT HAVE ALT ALERTING INSTRUMENTS. APCHING 10000', I WAS DISTRACTED INSIDE (PRESSURE PROB) THE COCKPIT MOMENTARILY. I THEN REALIZED I PASSED THROUGH MY ALT AND BY 10500' I HAD STARTED BACK DOWN TO 10000'. WE NEVER SAW THE SMA Y AND NO EVASIVE ACTION HAD TO BE TAKEN. CENTER THEN RECONFIRMED MY ALT AND REQUESTED I CALL THEM ON THE GND. CENTER SAID THE ACFT WERE 4 MI APART HORIZ AND 500' VERT AT THE CLOSEST POINT.

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.