TCAS RA for air carrier large transport departing ont leads to altitude deviation.

Attributes
ACN	177259
Time
Date	199105
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pdz airport : ont
State Reference	CA
Altitude	msl bound lower : 6000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bos
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude climbout : initial
Route In Use	departure other departure sid : sid enroute airway : ont
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	cruise other descent other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 4000 flight time type : 80
ASRS Report	177259
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 1000
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Departed ont flying the prado 2 departure. Made climbing left turn as per departure procedure. Was cleared to 7000'. Ont departure control advised us of small aircraft Y traffic 11 O'clock, 6500'. We were told to level at 6000'. We were level 6000' when departure asked small aircraft Y if he was descending. Shortly after that we got a TCAS TA, then RA climb, we started climb and advised ATC, who then cleared us to 7000'.

Original NASA ASRS Text

Title: TCAS RA FOR ACR LGT DEPARTING ONT LEADS TO ALT DEVIATION.

Narrative: DEPARTED ONT FLYING THE PRADO 2 DEP. MADE CLBING LEFT TURN AS PER DEP PROC. WAS CLRED TO 7000'. ONT DEP CTL ADVISED US OF SMA Y TFC 11 O'CLOCK, 6500'. WE WERE TOLD TO LEVEL AT 6000'. WE WERE LEVEL 6000' WHEN DEP ASKED SMA Y IF HE WAS DSNDING. SHORTLY AFTER THAT WE GOT A TCAS TA, THEN RA CLB, WE STARTED CLB AND ADVISED ATC, WHO THEN CLRED US TO 7000'.

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.