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B747 TCASII TA climb through occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 296772 |
| Time | |
| Date | 199502 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sbre |
| State Reference | FO |
| Altitude | msl bound lower : 31000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : sbre tower : jfk |
| Operator | common carrier : air carrier |
| Make Model Name | B747-100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer |
| Experience | flight time last 90 days : 210 flight time total : 13000 flight time type : 4800 |
| ASRS Report | 296772 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 35000 vertical : 1300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
At approximately XA48 UTC, while calculating fuel burn for our next fix (polda intersection approximately XA53 UTC) captain requested 'climb thrust,' after receiving climb clearance from recife center, 'cleared from FL310 to FL350 report leaving and reaching FL350,' after leaving 31500 ft another air carrier Y was sighted at our 10-11 O'clock position 15-20 mi and approximately 4-5 mi left of our track we turned on all lights but received no acknowledgement from other aircraft, we then leveled off at approximately 31700 ft. Noting that opposite direction traffic was now visible on TCASII indicating FL330 we then inquired recife center about this traffic at which time he changed climb clearance to 'descend to FL310.' once informed that we were now clear of traffic, he once again amended clearance to climb to FL350.
Original NASA ASRS Text
Title: B747 TCASII TA CLB THROUGH OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: AT APPROX XA48 UTC, WHILE CALCULATING FUEL BURN FOR OUR NEXT FIX (POLDA INTXN APPROX XA53 UTC) CAPT REQUESTED 'CLB THRUST,' AFTER RECEIVING CLB CLRNC FROM RECIFE CTR, 'CLRED FROM FL310 TO FL350 RPT LEAVING AND REACHING FL350,' AFTER LEAVING 31500 FT ANOTHER ACR Y WAS SIGHTED AT OUR 10-11 O'CLOCK POS 15-20 MI AND APPROX 4-5 MI L OF OUR TRACK WE TURNED ON ALL LIGHTS BUT RECEIVED NO ACKNOWLEDGEMENT FROM OTHER ACFT, WE THEN LEVELED OFF AT APPROX 31700 FT. NOTING THAT OPPOSITE DIRECTION TFC WAS NOW VISIBLE ON TCASII INDICATING FL330 WE THEN INQUIRED RECIFE CTR ABOUT THIS TFC AT WHICH TIME HE CHANGED CLB CLRNC TO 'DSND TO FL310.' ONCE INFORMED THAT WE WERE NOW CLR OF TFC, HE ONCE AGAIN AMENDED CLRNC TO CLB TO FL350.
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.