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Flight crew of medium large transport on ILS GS at 1500 MSL had GS needle deflection, broke out of overcast, saw widebody transport freighter crossing at end of runway in front of GS antenna.
| Attributes | |
| ACN | 195457 |
| Time | |
| Date | 199111 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 1500 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach descent other landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 19500 |
| ASRS Report | 195457 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : atp pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
| Airport | other physical facility procedure or policy : unspecified |
Narrative:
Final approach to runway 17L at dfw. Using ILS coupled approach. We were in the clouds, and had not made ground contact. Suddenly the GS needle started making a full scale deflection. We disengaged the autoplt. The GS made 3 full scale cycles. Shortly thereafter, we made visual contact with the runway. An XXX airlines cargo widebody transport was just clearing the runway. He had been cleared to cross the approach end of 17L from east to west from the cargo area for takeoff on 17R. Discussion with the supervisor indicated tower criteria of visibility and ceiling was being met for allowing the aircraft to taxi through the glide path signal. I suggest that this procedure should not be permitted unless ceiling and visibility allow visual contact from the ILS GS intercept point.
Original NASA ASRS Text
Title: FLC OF MLG ON ILS GS AT 1500 MSL HAD GS NEEDLE DEFLECTION, BROKE OUT OF OVCST, SAW WDB FREIGHTER XING AT END OF RWY IN FRONT OF GS ANTENNA.
Narrative: FINAL APCH TO RWY 17L AT DFW. USING ILS COUPLED APCH. WE WERE IN THE CLOUDS, AND HAD NOT MADE GND CONTACT. SUDDENLY THE GS NEEDLE STARTED MAKING A FULL SCALE DEFLECTION. WE DISENGAGED THE AUTOPLT. THE GS MADE 3 FULL SCALE CYCLES. SHORTLY THEREAFTER, WE MADE VISUAL CONTACT WITH THE RWY. AN XXX AIRLINES CARGO WDB WAS JUST CLRING THE RWY. HE HAD BEEN CLRED TO CROSS THE APCH END OF 17L FROM E TO W FROM THE CARGO AREA FOR TKOF ON 17R. DISCUSSION WITH THE SUPVR INDICATED TWR CRITERIA OF VISIBILITY AND CEILING WAS BEING MET FOR ALLOWING THE ACFT TO TAXI THROUGH THE GLIDE PATH SIGNAL. I SUGGEST THAT THIS PROC SHOULD NOT BE PERMITTED UNLESS CEILING AND VISIBILITY ALLOW VISUAL CONTACT FROM THE ILS GS INTERCEPT POINT.
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.