37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Attributes | |
ACN | 549508 |
Time | |
Date | 200205 |
Day | Fri |
Local Time Of Day | 1201 To 1800 |
Place | |
Locale Reference | airport : phl.airport |
State Reference | PA |
Altitude | msl single value : 6000 |
Environment | |
Flight Conditions | VMC |
Light | Daylight |
Aircraft 1 | |
Controlling Facilities | tracon : phl.tracon |
Operator | common carrier : air carrier |
Make Model Name | B737-800 |
Operating Under FAR Part | Part 121 |
Navigation In Use | other |
Route In Use | arrival : on vectors |
Flight Plan | IFR |
Aircraft 2 | |
Controlling Facilities | tracon : phl.tracon |
Make Model Name | PA-31 Navajo Chieftan/Mojave/Navajo T1020 |
Flight Phase | descent other |
Person 1 | |
Affiliation | company : air carrier |
Function | flight crew : first officer |
Qualification | pilot : multi engine pilot : flight engineer pilot : atp |
Experience | flight time last 90 days : 170 flight time total : 3600 flight time type : 500 |
ASRS Report | 549508 |
Person 2 | |
Affiliation | company : air carrier |
Function | flight crew : captain oversight : pic |
Events | |
Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa |
Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude flight crew : took precautionary avoidance action |
Consequence | faa : reviewed incident with flight crew |
Miss Distance | horizontal : 18000 vertical : 400 |
Supplementary | |
Problem Areas | Flight Crew Human Performance Airspace Structure ATC Human Performance |
Primary Problem | ATC Human Performance |
Narrative:
I was the copilot and PNF on aircraft X, a B737-800, approaching phl for landing. We were at 6000 ft MSL, on a 190 degree heading for phl, 10 NM north of the airport. Traffic was called by ATC as a navajo descending to 6500 ft, 4-5 NM on a northerly heading. While monitoring the TCASII, we received a TA, which was to be expected. I continued to monitor the TCASII to ensure that the traffic leveled at his assigned 6500 ft. The traffic was not in visual contact. Approximately 3-4 seconds after the TA, the TCASII system responded with an RA. This time I noticed the traffic on the TCASII was 3-4 mi at +400 ft above with a trend vector showing down. The autoplt was disconnected and a descent was initiated to 5000 ft in response to the RA. ATC was notified immediately upon beginning our descent. The lowest altitude that was reached was approximately 5500 ft. Upon the TCASII system annunciating 'clear of conflict,' we returned to our previously assigned altitude. It was reassuring to know that the TCASII system does in fact work for both TA's and RA's. I do feel that unless both aircraft have each other in sight, that traffic should not be controled so as to cause RA's on the TCASII system. As pilots, we are taught to respond immediately to certain advisories (GPWS, windshear, TCASII, etc). To expect us to ignore certain alerts in an effort to increase traffic capacity does a great disservice to our training.
Original NASA ASRS Text
Title: A B737-800 FO COMPLAINS OF THE ATC PROCS OF APCH CTLR IN PLANNING TFC CTL AND REDUCED SEPARATION BTWN ACFT WITHIN THE CLASS B AIRSPACE OF PHL, PA.
Narrative: I WAS THE COPLT AND PNF ON ACFT X, A B737-800, APCHING PHL FOR LNDG. WE WERE AT 6000 FT MSL, ON A 190 DEG HDG FOR PHL, 10 NM N OF THE ARPT. TFC WAS CALLED BY ATC AS A NAVAJO DSNDING TO 6500 FT, 4-5 NM ON A NORTHERLY HDG. WHILE MONITORING THE TCASII, WE RECEIVED A TA, WHICH WAS TO BE EXPECTED. I CONTINUED TO MONITOR THE TCASII TO ENSURE THAT THE TFC LEVELED AT HIS ASSIGNED 6500 FT. THE TFC WAS NOT IN VISUAL CONTACT. APPROX 3-4 SECONDS AFTER THE TA, THE TCASII SYS RESPONDED WITH AN RA. THIS TIME I NOTICED THE TFC ON THE TCASII WAS 3-4 MI AT +400 FT ABOVE WITH A TREND VECTOR SHOWING DOWN. THE AUTOPLT WAS DISCONNECTED AND A DSCNT WAS INITIATED TO 5000 FT IN RESPONSE TO THE RA. ATC WAS NOTIFIED IMMEDIATELY UPON BEGINNING OUR DSCNT. THE LOWEST ALT THAT WAS REACHED WAS APPROX 5500 FT. UPON THE TCASII SYS ANNUNCIATING 'CLR OF CONFLICT,' WE RETURNED TO OUR PREVIOUSLY ASSIGNED ALT. IT WAS REASSURING TO KNOW THAT THE TCASII SYS DOES IN FACT WORK FOR BOTH TA'S AND RA'S. I DO FEEL THAT UNLESS BOTH ACFT HAVE EACH OTHER IN SIGHT, THAT TFC SHOULD NOT BE CTLED SO AS TO CAUSE RA'S ON THE TCASII SYS. AS PLTS, WE ARE TAUGHT TO RESPOND IMMEDIATELY TO CERTAIN ADVISORIES (GPWS, WINDSHEAR, TCASII, ETC). TO EXPECT US TO IGNORE CERTAIN ALERTS IN AN EFFORT TO INCREASE TFC CAPACITY DOES A GREAT DISSERVICE TO OUR TRAINING.
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.