First officer of air carrier medium large transport aircraft deviated from assigned altitude in resp...

Attributes
ACN	216004
Time
Date	199207
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ood airport : phl
State Reference	NJ
Altitude	msl bound lower : 9500 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zdc
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 3000
ASRS Report	216004
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 30000 vertical : 800
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After being handed off to ZDC from phl departure we were warned by center of VFR traffic at approximately 5 mi to our 1 O'clock position at 10500 ft, descending. Our TCASII commanded a descent and we followed its commands to approximately 9500 ft. When clear of conflict, we returned to our assigned altitude of 10000 ft.

Original NASA ASRS Text

Title: FO OF ACR MLG ACFT DEVIATED FROM ASSIGNED ALT IN RESPONSE TO A TCASII RA.

Narrative: AFTER BEING HANDED OFF TO ZDC FROM PHL DEP WE WERE WARNED BY CTR OF VFR TFC AT APPROX 5 MI TO OUR 1 O'CLOCK POS AT 10500 FT, DSNDING. OUR TCASII COMMANDED A DSCNT AND WE FOLLOWED ITS COMMANDS TO APPROX 9500 FT. WHEN CLR OF CONFLICT, WE RETURNED TO OUR ASSIGNED ALT OF 10000 FT.

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.

First officer of air carrier medium large transport aircraft deviated from assigned altitude in response to a TCASII RA.