 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
While on an instrument approach in class C airspace, a B727 flight crew received a TCASII RA commanding descent. The flight crew followed TCASII commands.
| Attributes | |
| ACN | 313211 |
| Time | |
| Date | 199508 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bna |
| State Reference | TN |
| Altitude | msl bound lower : 2500 msl bound upper : 2500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bna |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 220 flight time total : 4000 flight time type : 1500 |
| ASRS Report | 313211 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : atp pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 20400 flight time type : 400 |
| ASRS Report | 313747 |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 4000 vertical : 100 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
ILS runway 2L, bna, on GS passing 2500 ft MSL, approach advised traffic at 11 O'clock and 2200 ft. TCASII announced 'traffic, traffic.' captain indicated to first officer to level off or climb. First officer began leveloff as TCASII called 'descend, descend now.' first officer began descent as captain signaled first officer to descend. TCASII showed green fly to arc at 1500 FPM down. Captain and so saw traffic at 10:30 O'clock position as approach control called traffic at 1 mi and gave authority/authorized to climb or go missed approach. As first officer continued towards 1500 FPM down 'fly to' arc, TCASII called 'climb, climb now.' with the traffic in sight, first officer continued approach as TCASII called 'monitor vertical speed,' then 'clear of conflict.' it was a difficult situation because: we were close to the ground, in a gentle descent with traffic below us. We wanted to climb or level but TCASII commanded descent and approach ok'd a climb, but training dictates that we follow TCASII RA's. Supplemental information from acn 313747: conflict was with a high wing taildragger in opposite direction.
Original NASA ASRS Text
Title: WHILE ON AN INST APCH IN CLASS C AIRSPACE, A B727 FLC RECEIVED A TCASII RA COMMANDING DSCNT. THE FLC FOLLOWED TCASII COMMANDS.
Narrative: ILS RWY 2L, BNA, ON GS PASSING 2500 FT MSL, APCH ADVISED TFC AT 11 O'CLOCK AND 2200 FT. TCASII ANNOUNCED 'TFC, TFC.' CAPT INDICATED TO FO TO LEVEL OFF OR CLB. FO BEGAN LEVELOFF AS TCASII CALLED 'DSND, DSND NOW.' FO BEGAN DSCNT AS CAPT SIGNALED FO TO DSND. TCASII SHOWED GREEN FLY TO ARC AT 1500 FPM DOWN. CAPT AND SO SAW TFC AT 10:30 O'CLOCK POS AS APCH CTL CALLED TFC AT 1 MI AND GAVE AUTH TO CLB OR GO MISSED APCH. AS FO CONTINUED TOWARDS 1500 FPM DOWN 'FLY TO' ARC, TCASII CALLED 'CLB, CLB NOW.' WITH THE TFC IN SIGHT, FO CONTINUED APCH AS TCASII CALLED 'MONITOR VERT SPD,' THEN 'CLR OF CONFLICT.' IT WAS A DIFFICULT SIT BECAUSE: WE WERE CLOSE TO THE GND, IN A GENTLE DSCNT WITH TFC BELOW US. WE WANTED TO CLB OR LEVEL BUT TCASII COMMANDED DSCNT AND APCH OK'D A CLB, BUT TRAINING DICTATES THAT WE FOLLOW TCASII RA'S. SUPPLEMENTAL INFO FROM ACN 313747: CONFLICT WAS WITH A HIGH WING TAILDRAGGER IN OPPOSITE DIRECTION.
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.