Altitude deviation altitude excursion in response to a TCAS ii alert.

Attributes
ACN	168368
Time
Date	199101
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : hdf
State Reference	CA
Altitude	msl bound lower : 14000 msl bound upper : 14750
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	arrival other arrival star : star enroute airway : v372
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 117 flight time total : 18200 flight time type : 1900
ASRS Report	168368
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 140 flight time total : 7000 flight time type : 2000
ASRS Report	168992
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew Other
Miss Distance	horizontal : 0 vertical : 1750
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

We were on V372 east of hdf at 14000' en route to orange county airport, working ontario approach control. We were given direct kayoh, expect lower in 5 mi. Shortly after that clearance, we were advised of another air carrier medium large transport was at one O'clock sebnd climbing to 13000'. Moments later, we received a traffic alert on the TCAS. The traffic appeared ahead at one O'clock and climbing, 1100' below, then 1000' below. The directional arrow disappeared. We then received a resolution advisory, climb, climb, climb. Our TCAS philosophy requires that, unless the safe operation of the aircraft is jeopardized, we comply with the RA. The first officer was flying the aircraft with the autoplt engaged. I then asked him to disconnect the autoplt and comply with the RA, which resulted in an altitude deviation of 750' (14750'). The TCAS then commanded monitor vertical speed and he returned to 14000'. I reported the altitude deviation to ontario approach and that we were complying with a TCAS RA. His comment was that this was something we were all going to have to learn to work with. We did not feel that an actual conflict existed but time did not permit a complete analysis of the situation. Supplemental information from acn 168992. The captain notified approach control, who was unaware of the situation, but stated 'no problem, I'm not familiar with TCAS, but I guess we will all have to get used to it.'

Original NASA ASRS Text

Title: ALT DEVIATION ALT EXCURSION IN RESPONSE TO A TCAS II ALERT.

Narrative: WE WERE ON V372 E OF HDF AT 14000' ENRTE TO ORANGE COUNTY ARPT, WORKING ONTARIO APCH CTL. WE WERE GIVEN DIRECT KAYOH, EXPECT LOWER IN 5 MI. SHORTLY AFTER THAT CLRNC, WE WERE ADVISED OF ANOTHER ACR MLG WAS AT ONE O'CLOCK SEBND CLBING TO 13000'. MOMENTS LATER, WE RECEIVED A TFC ALERT ON THE TCAS. THE TFC APPEARED AHEAD AT ONE O'CLOCK AND CLBING, 1100' BELOW, THEN 1000' BELOW. THE DIRECTIONAL ARROW DISAPPEARED. WE THEN RECEIVED A RESOLUTION ADVISORY, CLB, CLB, CLB. OUR TCAS PHILOSOPHY REQUIRES THAT, UNLESS THE SAFE OPERATION OF THE ACFT IS JEOPARDIZED, WE COMPLY WITH THE RA. THE F/O WAS FLYING THE ACFT WITH THE AUTOPLT ENGAGED. I THEN ASKED HIM TO DISCONNECT THE AUTOPLT AND COMPLY WITH THE RA, WHICH RESULTED IN AN ALT DEV OF 750' (14750'). THE TCAS THEN COMMANDED MONITOR VERTICAL SPD AND HE RETURNED TO 14000'. I RPTED THE ALT DEV TO ONTARIO APCH AND THAT WE WERE COMPLYING WITH A TCAS RA. HIS COMMENT WAS THAT THIS WAS SOMETHING WE WERE ALL GOING TO HAVE TO LEARN TO WORK WITH. WE DID NOT FEEL THAT AN ACTUAL CONFLICT EXISTED BUT TIME DID NOT PERMIT A COMPLETE ANALYSIS OF THE SITUATION. SUPPLEMENTAL INFO FROM ACN 168992. THE CAPT NOTIFIED APCH CTL, WHO WAS UNAWARE OF THE SITUATION, BUT STATED 'NO PROB, I'M NOT FAMILIAR WITH TCAS, BUT I GUESS WE WILL ALL HAVE TO GET USED TO IT.'

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.