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Flight crew of an MD80 advised center that their TCASII showed that they were holding with another aircraft. ATC immediately gave a heading and altitude change.
| Attributes | |
| ACN | 332720 |
| Time | |
| Date | 199604 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pmm |
| State Reference | MI |
| Altitude | msl bound lower : 28000 msl bound upper : 29000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 332720 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | vertical : 100 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
About 20 mi from pmm, we received holding instructions to hold at pmm, right turns at FL290, efc or about 30 mins. As we hit pmm we began our right turn and simultaneously noticed on TCASII a '00' across the circle. We spent the entire 180 degree turn to the outbound leg attempting to call ZAU and inform them we were holding at the same altitude as another aircraft. We finally were able to get the call into center at the beginning of the outbound leg. Center told us to descend immediately to FL280. We looked at TCASII and noticed a '-01' at our 6 O'clock. We informed center of our TCASII readings. Center then told us to turn to 060 degree heading. We complied, then re-entered the holding pattern at FL290 with no other aircraft at our altitude.
Original NASA ASRS Text
Title: FLC OF AN MD80 ADVISED CTR THAT THEIR TCASII SHOWED THAT THEY WERE HOLDING WITH ANOTHER ACFT. ATC IMMEDIATELY GAVE A HDG AND ALT CHANGE.
Narrative: ABOUT 20 MI FROM PMM, WE RECEIVED HOLDING INSTRUCTIONS TO HOLD AT PMM, R TURNS AT FL290, EFC OR ABOUT 30 MINS. AS WE HIT PMM WE BEGAN OUR R TURN AND SIMULTANEOUSLY NOTICED ON TCASII A '00' ACROSS THE CIRCLE. WE SPENT THE ENTIRE 180 DEG TURN TO THE OUTBOUND LEG ATTEMPTING TO CALL ZAU AND INFORM THEM WE WERE HOLDING AT THE SAME ALT AS ANOTHER ACFT. WE FINALLY WERE ABLE TO GET THE CALL INTO CTR AT THE BEGINNING OF THE OUTBOUND LEG. CTR TOLD US TO DSND IMMEDIATELY TO FL280. WE LOOKED AT TCASII AND NOTICED A '-01' AT OUR 6 O'CLOCK. WE INFORMED CTR OF OUR TCASII READINGS. CTR THEN TOLD US TO TURN TO 060 DEG HDG. WE COMPLIED, THEN RE-ENTERED THE HOLDING PATTERN AT FL290 WITH NO OTHER ACFT AT OUR ALT.
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.