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Small transport on ILS approach descends below glide slope intercept altitude prior to reaching outer marker.
| Attributes | |
| ACN | 133466 |
| Time | |
| Date | 199001 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ikk |
| State Reference | IL |
| Altitude | msl bound lower : 1200 msl bound upper : 2500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 70 flight time total : 800 flight time type : 25 |
| ASRS Report | 133466 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We departed frankfort, il after picking up our IFR clearance on the ground and turned left to our assigned heading of 090 degree and climbed to 2500' as assigned. This is where the problems began with the radios. Center informed us that our xmissions were unreadable so we switched radios, and that seemed to work -- for awhile. We then proceeded on radar vectors for the first ILS approach into kankakee. However, throughout the whole en route phase the radios would work and then they wouldn't, causing more than a bit of distraction. We were finally vectored for the approach, turned left to 070 degree for localizer intercept, and when cleared for the approach told by center that we were 1 mi from the marker and to cancel with him. We then intercepted the localizer and flew it inbound, waiting to cross the marker for descent. Well, we flew at least 4 mi with no marker light and the glideslope indicating that we were very high. At glide slope intercept altitude, with no flag on the VOR head -- being that the controller told us earlier that we were 1 mi from the marker -- we figured that we must be inside the marker. Given the quality of the radios on this flight, we started to descend to capture the glide slope and did so until we broke out luckily at 1300 MSL to find ourselves not only way low, but just picking up the outer marker! We then stayed at 1300' and maintained visual with the ground and flying only the localizer until we had the runway in sight.
Original NASA ASRS Text
Title: SMT ON ILS APCH DESCENDS BELOW GLIDE SLOPE INTERCEPT ALT PRIOR TO REACHING OUTER MARKER.
Narrative: WE DEPARTED FRANKFORT, IL AFTER PICKING UP OUR IFR CLRNC ON THE GND AND TURNED LEFT TO OUR ASSIGNED HDG OF 090 DEG AND CLIMBED TO 2500' AS ASSIGNED. THIS IS WHERE THE PROBLEMS BEGAN WITH THE RADIOS. CENTER INFORMED US THAT OUR XMISSIONS WERE UNREADABLE SO WE SWITCHED RADIOS, AND THAT SEEMED TO WORK -- FOR AWHILE. WE THEN PROCEEDED ON RADAR VECTORS FOR THE FIRST ILS APCH INTO KANKAKEE. HOWEVER, THROUGHOUT THE WHOLE ENRTE PHASE THE RADIOS WOULD WORK AND THEN THEY WOULDN'T, CAUSING MORE THAN A BIT OF DISTR. WE WERE FINALLY VECTORED FOR THE APCH, TURNED LEFT TO 070 DEG FOR LOC INTERCEPT, AND WHEN CLRED FOR THE APCH TOLD BY CENTER THAT WE WERE 1 MI FROM THE MARKER AND TO CANCEL WITH HIM. WE THEN INTERCEPTED THE LOC AND FLEW IT INBND, WAITING TO CROSS THE MARKER FOR DSCNT. WELL, WE FLEW AT LEAST 4 MI WITH NO MARKER LIGHT AND THE GLIDESLOPE INDICATING THAT WE WERE VERY HIGH. AT GLIDE SLOPE INTERCEPT ALT, WITH NO FLAG ON THE VOR HEAD -- BEING THAT THE CTLR TOLD US EARLIER THAT WE WERE 1 MI FROM THE MARKER -- WE FIGURED THAT WE MUST BE INSIDE THE MARKER. GIVEN THE QUALITY OF THE RADIOS ON THIS FLT, WE STARTED TO DSND TO CAPTURE THE GLIDE SLOPE AND DID SO UNTIL WE BROKE OUT LUCKILY AT 1300 MSL TO FIND OURSELVES NOT ONLY WAY LOW, BUT JUST PICKING UP THE OUTER MARKER! WE THEN STAYED AT 1300' AND MAINTAINED VISUAL WITH THE GND AND FLYING ONLY THE LOC UNTIL WE HAD THE RWY IN SIGHT.
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.