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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Near midair collision -- air carrier has a near hit with an aircraft that was flying just above the class 'B' airspace with no transponder transmission.
| Attributes | |
| ACN | 311824 |
| Time | |
| Date | 199507 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sea |
| State Reference | WA |
| Altitude | msl bound lower : 9700 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sea |
| 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 : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 21540 flight time type : 1900 |
| ASRS Report | 311824 |
| 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 : nmac non adherence : far non adherence : clearance other anomaly other |
| Independent Detector | 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 |
| Miss Distance | horizontal : 0 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Intruder aircraft was at 10100-10300 ft. We were assigned and maintaining 10000 ft 250 KTS. Intruder was above class B airspace. But operating with no transponder. We descended to 9700 ft without ATC clearance and advised ATC of our actions and the traffic. Controller said he had 'no target' and later painted a weak 'skin paint.' pilots need to be reminded that an operative transponder is required within 30 mi of a major airport. Even if above class B. This could have been a disaster as we had only 10-15 seconds to act. TCASII and radar service/separation do no good if aircraft do not have/use xponders and contact ATC if intending to transit busy air carrier airports.
Original NASA ASRS Text
Title: NMAC -- ACR HAS A NEAR HIT WITH AN ACFT THAT WAS FLYING JUST ABOVE THE CLASS 'B' AIRSPACE WITH NO XPONDER XMISSION.
Narrative: INTRUDER ACFT WAS AT 10100-10300 FT. WE WERE ASSIGNED AND MAINTAINING 10000 FT 250 KTS. INTRUDER WAS ABOVE CLASS B AIRSPACE. BUT OPERATING WITH NO XPONDER. WE DSNDED TO 9700 FT WITHOUT ATC CLRNC AND ADVISED ATC OF OUR ACTIONS AND THE TFC. CTLR SAID HE HAD 'NO TARGET' AND LATER PAINTED A WEAK 'SKIN PAINT.' PLTS NEED TO BE REMINDED THAT AN OPERATIVE XPONDER IS REQUIRED WITHIN 30 MI OF A MAJOR ARPT. EVEN IF ABOVE CLASS B. THIS COULD HAVE BEEN A DISASTER AS WE HAD ONLY 10-15 SECONDS TO ACT. TCASII AND RADAR SVC/SEPARATION DO NO GOOD IF ACFT DO NOT HAVE/USE XPONDERS AND CONTACT ATC IF INTENDING TO TRANSIT BUSY ACR ARPTS.
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.