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A pilot and instructor experienced an automated traffic alert and near mid air collision when they encountered a conflicting aircraft with an inoperative transponder. ATC had not provided any traffic information.
| Attributes | |
| ACN | 1210400 |
| Time | |
| Date | 201410 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | SR20 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Flight Plan | None |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Person 1 | |
| Function | Instructor |
| Qualification | Flight Crew Instrument Flight Crew Commercial Flight Crew Flight Instructor |
| Experience | Flight Crew Last 90 Days 50 Flight Crew Total 1300 Flight Crew Type 1200 |
| Events | |
| Anomaly | ATC Issue All Types Aircraft Equipment Problem Less Severe Conflict NMAC Deviation - Altitude Excursion From Assigned Altitude |
| Miss Distance | Vertical 300 |
Narrative:
My student was flying the VOR 35 into ZZZ airport and was issued the published missed at ZZZZ intersection but was asked to hold at 3;600 instead of the published 2;600 feet. On our second trip around on the outbound leg our TCAS issued a traffic alert with no altitude indication heading across our present course. As we were in a low wing aircraft I took controls and issued a climb to hopefully avoid the inbound aircraft. After climbing to 3;800 feet I was able to spot a piper single engine aircraft that was crossing right underneath us. At that time I informed ZZZ departure of why we were higher than we were supposed to be and made them aware of the piper flying without a mode-c transponder. ZZZ departure later reported back that the piper had called up ZZZ1 tower and confirmed that their mode-c was not working.
Original NASA ASRS Text
Title: A pilot and instructor experienced an automated traffic alert and near mid air collision when they encountered a conflicting aircraft with an inoperative transponder. ATC had not provided any traffic information.
Narrative: My student was flying the VOR 35 into ZZZ Airport and was issued the published missed at ZZZZ Intersection but was asked to hold at 3;600 instead of the published 2;600 feet. On our second trip around on the outbound leg our TCAS issued a traffic alert with no altitude indication heading across our present course. As we were in a low wing aircraft I took controls and issued a climb to hopefully avoid the inbound aircraft. After climbing to 3;800 feet I was able to spot a Piper single engine aircraft that was crossing right underneath us. At that time I informed ZZZ departure of why we were higher than we were supposed to be and made them aware of the piper flying without a mode-c transponder. ZZZ Departure later reported back that the piper had called up ZZZ1 Tower and confirmed that their mode-c was not working.
Data retrieved from NASA's ASRS site 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.