Altitude deviation altitude overshot excursion in descent to occupied altitude.

Attributes
ACN	262760
Time
Date	199402
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : btg airport : pdx
State Reference	WA
Altitude	msl bound lower : 7000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pdx
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	descent 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 : 220 flight time total : 6000 flight time type : 3500
ASRS Report	262760
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 2250 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were on a departure climb from pdx to sea. Our clearance was to climb to and maintain 9000 ft, and the aircraft we ended up being in conflict with was on a descent to 10000 ft. As we were passing approximately 7000 to 8000 ft, we received an RA commanding a 'climb' on our TCASII. Evidently, the conflicting aircraft also received an RA and his command was to 'descend.' the ATC controller instructed him to level off at 10000 ft, but instead he continued his descent, presumably because his TCASII was commanding him to do so. By the time we arrived at our assigned altitude, 9000 ft, the TCASII called us 'clear of conflict.' we never did see the other aircraft, but according to the TCASII, he ended up at approximately our altitude and within 1/4 - 1/2 of a mi from us.

Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT EXCURSION IN DSCNT TO OCCUPIED ALT.

Narrative: WE WERE ON A DEP CLB FROM PDX TO SEA. OUR CLRNC WAS TO CLB TO AND MAINTAIN 9000 FT, AND THE ACFT WE ENDED UP BEING IN CONFLICT WITH WAS ON A DSCNT TO 10000 FT. AS WE WERE PASSING APPROX 7000 TO 8000 FT, WE RECEIVED AN RA COMMANDING A 'CLB' ON OUR TCASII. EVIDENTLY, THE CONFLICTING ACFT ALSO RECEIVED AN RA AND HIS COMMAND WAS TO 'DSND.' THE ATC CTLR INSTRUCTED HIM TO LEVEL OFF AT 10000 FT, BUT INSTEAD HE CONTINUED HIS DSCNT, PRESUMABLY BECAUSE HIS TCASII WAS COMMANDING HIM TO DO SO. BY THE TIME WE ARRIVED AT OUR ASSIGNED ALT, 9000 FT, THE TCASII CALLED US 'CLR OF CONFLICT.' WE NEVER DID SEE THE OTHER ACFT, BUT ACCORDING TO THE TCASII, HE ENDED UP AT APPROX OUR ALT AND WITHIN 1/4 - 1/2 OF A MI FROM US.

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.