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First officer of a B737 held on the wrong radial in a holding pattern when troubleshooting an aircraft unusual noise problem. ATC intervened and advised that there was no conflict caused.
| Attributes | |
| ACN | 354288 |
| Time | |
| Date | 199611 |
| Day | Sat |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : bld airport : las |
| State Reference | NV |
| Altitude | msl bound lower : 7000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : las |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 15000 flight time type : 5000 |
| ASRS Report | 354288 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On liftoff from las, we got a loud banging noise under the cockpit floor accompanied by a rush of air. Since maintenance had just worked on aircraft I assumed it was related. Noise finally stopped after 2 mins. I told ATC we needed to level off for a possible turn back to las. Leveled at 7000 ft for vector. First officer flying. I told first officer to fly aircraft and I would call maintenance and dispatch. Also, I briefed flight attendant and passenger. I also tried to monitor ATC's instructions to first officer while I performed these other duties. I heard him acknowledge holding instructions on bld 210 degree radial, 10 mi legs. We were in EFIS aircraft and I saw him type into FMC holding instructions. I finally had to leave ATC frequency altogether because I couldn't carry on necessary conversations and listen to him talk to ATC at same time. First officer is typed in aircraft but a 6 month first officer. He typed 210 degrees as inbound course. He should have typed 030 degrees. When I came back on frequency I heard ATC say no problem, and give him a vector. I asked what the problem was and he said some confusion over holding pattern. The next day he told me he figured out he must have held on wrong radial. Good thing it was XA30 and las was landing on runway 1R and not runway 25 or we would have got TCASII on arriving traffic. I probably should have monitored him closer. The noise was equipment cooling fan valve slamming back and forth. Maintenance replaced valve.
Original NASA ASRS Text
Title: FO OF A B737 HELD ON THE WRONG RADIAL IN A HOLDING PATTERN WHEN TROUBLESHOOTING AN ACFT UNUSUAL NOISE PROB. ATC INTERVENED AND ADVISED THAT THERE WAS NO CONFLICT CAUSED.
Narrative: ON LIFTOFF FROM LAS, WE GOT A LOUD BANGING NOISE UNDER THE COCKPIT FLOOR ACCOMPANIED BY A RUSH OF AIR. SINCE MAINT HAD JUST WORKED ON ACFT I ASSUMED IT WAS RELATED. NOISE FINALLY STOPPED AFTER 2 MINS. I TOLD ATC WE NEEDED TO LEVEL OFF FOR A POSSIBLE TURN BACK TO LAS. LEVELED AT 7000 FT FOR VECTOR. FO FLYING. I TOLD FO TO FLY ACFT AND I WOULD CALL MAINT AND DISPATCH. ALSO, I BRIEFED FLT ATTENDANT AND PAX. I ALSO TRIED TO MONITOR ATC'S INSTRUCTIONS TO FO WHILE I PERFORMED THESE OTHER DUTIES. I HEARD HIM ACKNOWLEDGE HOLDING INSTRUCTIONS ON BLD 210 DEG RADIAL, 10 MI LEGS. WE WERE IN EFIS ACFT AND I SAW HIM TYPE INTO FMC HOLDING INSTRUCTIONS. I FINALLY HAD TO LEAVE ATC FREQ ALTOGETHER BECAUSE I COULDN'T CARRY ON NECESSARY CONVERSATIONS AND LISTEN TO HIM TALK TO ATC AT SAME TIME. FO IS TYPED IN ACFT BUT A 6 MONTH FO. HE TYPED 210 DEGS AS INBOUND COURSE. HE SHOULD HAVE TYPED 030 DEGS. WHEN I CAME BACK ON FREQ I HEARD ATC SAY NO PROB, AND GIVE HIM A VECTOR. I ASKED WHAT THE PROB WAS AND HE SAID SOME CONFUSION OVER HOLDING PATTERN. THE NEXT DAY HE TOLD ME HE FIGURED OUT HE MUST HAVE HELD ON WRONG RADIAL. GOOD THING IT WAS XA30 AND LAS WAS LNDG ON RWY 1R AND NOT RWY 25 OR WE WOULD HAVE GOT TCASII ON ARRIVING TFC. I PROBABLY SHOULD HAVE MONITORED HIM CLOSER. THE NOISE WAS EQUIP COOLING FAN VALVE SLAMMING BACK AND FORTH. MAINT REPLACED VALVE.
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.