A TCASII commanded excursion from altitude in IMC on approach to san, ca.

Attributes
ACN	507320
Time
Date	200104
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : san.airport
State Reference	CA
Altitude	msl single value : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : iah.tower
Operator	common carrier : air carrier
Make Model Name	MD-83
Flight Phase	descent : approach
Route In Use	approach : instrument non precision arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 5000 flight time type : 3000
ASRS Report	507320
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : required legal separation
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Miss Distance	vertical : 500
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance Airspace Structure
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While on a vector to intercept the localizer 27 approach at san airport, we responded to a TCASII RA. We were instructed to climb, and did so until clear of conflict. We climbed from 5000 ft MSL to approximately 6200 ft MSL before leveling off. We informed ATC of the RA. We were then revectored around for another approach. This all occurred in IMC. No further conflict was experienced. Normal approach and landing.

Original NASA ASRS Text

Title: A TCASII COMMANDED EXCURSION FROM ALT IN IMC ON APCH TO SAN, CA.

Narrative: WHILE ON A VECTOR TO INTERCEPT THE LOC 27 APCH AT SAN ARPT, WE RESPONDED TO A TCASII RA. WE WERE INSTRUCTED TO CLB, AND DID SO UNTIL CLR OF CONFLICT. WE CLBED FROM 5000 FT MSL TO APPROX 6200 FT MSL BEFORE LEVELING OFF. WE INFORMED ATC OF THE RA. WE WERE THEN REVECTORED AROUND FOR ANOTHER APCH. THIS ALL OCCURRED IN IMC. NO FURTHER CONFLICT WAS EXPERIENCED. NORMAL APCH AND LNDG.

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.