 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737-300 flight crew report of a possible near midair collision or potential conflict with an E2 aircraft that showed 1000 ft above on TCASII as it passed overhead. The engine or aircraft noise was too loud for them to believe that the aircraft was that far away.
| Attributes | |
| ACN | 363894 |
| Time | |
| Date | 199703 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : swl |
| State Reference | MD |
| Altitude | msl bound lower : 25000 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Hawkeye (E2) |
| Operating Under FAR Part | other : other |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 50 flight time total : 9900 flight time type : 5000 |
| ASRS Report | 363894 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 10000 flight time type : 7000 |
| ASRS Report | 363706 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 1000 |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
We were at cruise at FL250 about 50 mi south of swl VOR. Our direction was northbound in solid IMC. We noticed a target approaching us on TCASII in a descent. As the target merged with us I felt a vibration as well as very loud aircraft engine noise. The TCASII indicated target was 1000 ft above, but the noise and vibration I felt would indicate to me that the other aircraft was much closer. I'm guessing, but I would say with the noise level, the other aircraft probably passed within 200-400 ft. The flight attendants also heard the aircraft pass by and came rushing up to the cockpit to find out what was going on. In my yrs of flying, I have never heard that loud a noise by an aircraft that was passing 1000 ft above me. Supplemental information from acn 363706: target gives a brief TA on TCASII, target shows '+10' on dispaly at 2 mi. When target merges with aircraft symbol on our TCASII display, both captain and first officer heard a loud 'vrooom' sound pass by (IMC) that sounded like a turboprop aircraft. Flight attendants rush to cockpit to ask if we had just passed by an airplane! We had zero visibility. Other aircraft says he had us in sight!
Original NASA ASRS Text
Title: B737-300 FLC RPT OF A POSSIBLE NMAC OR POTENTIAL CONFLICT WITH AN E2 ACFT THAT SHOWED 1000 FT ABOVE ON TCASII AS IT PASSED OVERHEAD. THE ENG OR ACFT NOISE WAS TOO LOUD FOR THEM TO BELIEVE THAT THE ACFT WAS THAT FAR AWAY.
Narrative: WE WERE AT CRUISE AT FL250 ABOUT 50 MI S OF SWL VOR. OUR DIRECTION WAS NBOUND IN SOLID IMC. WE NOTICED A TARGET APCHING US ON TCASII IN A DSCNT. AS THE TARGET MERGED WITH US I FELT A VIBRATION AS WELL AS VERY LOUD ACFT ENG NOISE. THE TCASII INDICATED TARGET WAS 1000 FT ABOVE, BUT THE NOISE AND VIBRATION I FELT WOULD INDICATE TO ME THAT THE OTHER ACFT WAS MUCH CLOSER. I'M GUESSING, BUT I WOULD SAY WITH THE NOISE LEVEL, THE OTHER ACFT PROBABLY PASSED WITHIN 200-400 FT. THE FLT ATTENDANTS ALSO HEARD THE ACFT PASS BY AND CAME RUSHING UP TO THE COCKPIT TO FIND OUT WHAT WAS GOING ON. IN MY YRS OF FLYING, I HAVE NEVER HEARD THAT LOUD A NOISE BY AN ACFT THAT WAS PASSING 1000 FT ABOVE ME. SUPPLEMENTAL INFO FROM ACN 363706: TARGET GIVES A BRIEF TA ON TCASII, TARGET SHOWS '+10' ON DISPALY AT 2 MI. WHEN TARGET MERGES WITH ACFT SYMBOL ON OUR TCASII DISPLAY, BOTH CAPT AND FO HEARD A LOUD 'VROOOM' SOUND PASS BY (IMC) THAT SOUNDED LIKE A TURBOPROP ACFT. FLT ATTENDANTS RUSH TO COCKPIT TO ASK IF WE HAD JUST PASSED BY AN AIRPLANE! WE HAD ZERO VISIBILITY. OTHER ACFT SAYS HE HAD US IN SIGHT!
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.