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Aircraft taxiing encrouches on clear area and blocks glide slope signal. Three aircraft require go around.
| Attributes | |
| ACN | 157805 |
| Time | |
| Date | 199009 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 1600 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | ground : holding |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 13000 flight time type : 400 |
| ASRS Report | 157805 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | incursion : runway other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance other other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approaching the OM on a F/D approach to runway 27L at ord. I had just called for the gear down and final descent check. The first officer was somewhat distracted while running the check. I noticed a slight increase in rate of descent and it was getting larger (normal rate 700'-800' increased to about 1000'-1500'). Several things happened about the same time with LOM crossing. Both first officer and I reacted about the same time, questioning the descent rate. I stopped the descent rate and started back toward marker altitude about the same time approach control called us to check out altitude. I estimate the altitude deviation at the marker to be about 300'-400' low and we were climbing back to it. Soon thereafter I heard other aircraft questioning the status of the G/south. About the same time or within a few seconds thereafter approach again questioned our altitude and then said something like 'I see what's happening or what's going on or I see what's wrong. Then approach directed a missed approach. The second approach was normal. After landing I contacted approach by phone to find out that an aircraft on the ground had entered the clear area and disrupted the G/south signal for runway 27L. 3 aircraft had to miss. I wonder if anyone would have noticed the intruder aircraft if the WX was worse.
Original NASA ASRS Text
Title: ACFT TAXIING ENCROUCHES ON CLEAR AREA AND BLOCKS GLIDE SLOPE SIGNAL. THREE ACFT REQUIRE GO AROUND.
Narrative: APCHING THE OM ON A F/D APCH TO RWY 27L AT ORD. I HAD JUST CALLED FOR THE GEAR DOWN AND FINAL DSNT CHK. THE F/O WAS SOMEWHAT DISTRACTED WHILE RUNNING THE CHK. I NOTICED A SLIGHT INCREASE IN RATE OF DSNT AND IT WAS GETTING LARGER (NORMAL RATE 700'-800' INCREASED TO ABOUT 1000'-1500'). SEVERAL THINGS HAPPENED ABOUT THE SAME TIME WITH LOM XING. BOTH F/O AND I REACTED ABOUT THE SAME TIME, QUESTIONING THE DSNT RATE. I STOPPED THE DSNT RATE AND STARTED BACK TOWARD MARKER ALT ABOUT THE SAME TIME APCH CTL CALLED US TO CHK OUT ALT. I ESTIMATE THE ALT DEV AT THE MARKER TO BE ABOUT 300'-400' LOW AND WE WERE CLBING BACK TO IT. SOON THEREAFTER I HEARD OTHER ACFT QUESTIONING THE STATUS OF THE G/S. ABOUT THE SAME TIME OR WITHIN A FEW SECS THEREAFTER APCH AGAIN QUESTIONED OUR ALT AND THEN SAID SOMETHING LIKE 'I SEE WHAT'S HAPPENING OR WHAT'S GOING ON OR I SEE WHAT'S WRONG. THEN APCH DIRECTED A MISSED APCH. THE SEC APCH WAS NORMAL. AFTER LNDG I CONTACTED APCH BY PHONE TO FIND OUT THAT AN ACFT ON THE GND HAD ENTERED THE CLR AREA AND DISRUPTED THE G/S SIGNAL FOR RWY 27L. 3 ACFT HAD TO MISS. I WONDER IF ANYONE WOULD HAVE NOTICED THE INTRUDER ACFT IF THE WX WAS WORSE.
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.