Air carrier widebody transport altitude deviation altitude excursion during flight crew response to TCASII RA in overwater operation.

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Attributes
ACN	259873
Time
Date	199312
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zan
State Reference	AK
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : pacific enroute airway : zan
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : pacific enroute : other oceanic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 75 flight time total : 18000 flight time type : 500
ASRS Report	259873
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 75 flight time total : 15000 flight time type : 75
ASRS Report	259690
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation 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 : overcame equipment problem
Consequence	Other
Miss Distance	horizontal : 60000 vertical : 1500
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

While in cruise, crew received TCASII warning (climb command). Crew initiated evasive command until discerning warning as being false. TCASII showed only traffic in area (besides displayed TR ghost) was another plane 10 mi behind. We advised him on 128.95 HZ of our climb and he responded and had us in sight. Selected 7700 on transponder while climbing and returning to cleared altitude. Zan was out of range and we were unable to contact honolulu HF commercial radio until well after action was taken. TCASII had previous history of some maintenance 'status' messages. Suggestions were made to company for maintenance to render TCASII inoperative by pulling and collaring TCASII circuit breaker and to instruct crew to operate in transponder only mode.

Original NASA ASRS Text

Title: ACR WDB ALTDEV ALT EXCURSION DURING FLC RESPONSE TO TCASII RA IN OVERWATER OP.

Narrative: WHILE IN CRUISE, CREW RECEIVED TCASII WARNING (CLB COMMAND). CREW INITIATED EVASIVE COMMAND UNTIL DISCERNING WARNING AS BEING FALSE. TCASII SHOWED ONLY TFC IN AREA (BESIDES DISPLAYED TR GHOST) WAS ANOTHER PLANE 10 MI BEHIND. WE ADVISED HIM ON 128.95 HZ OF OUR CLB AND HE RESPONDED AND HAD US IN SIGHT. SELECTED 7700 ON XPONDER WHILE CLBING AND RETURNING TO CLRED ALT. ZAN WAS OUT OF RANGE AND WE WERE UNABLE TO CONTACT HONOLULU HF COMMERCIAL RADIO UNTIL WELL AFTER ACTION WAS TAKEN. TCASII HAD PREVIOUS HISTORY OF SOME MAINT 'STATUS' MESSAGES. SUGGESTIONS WERE MADE TO COMPANY FOR MAINT TO RENDER TCASII INOP BY PULLING AND COLLARING TCASII CIRCUIT BREAKER AND TO INSTRUCT CREW TO OPERATE IN XPONDER ONLY MODE.

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.