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Atx small transport started descent outside the IAF. Descended only to localizer minimums because the flight crew thought the glide slope was inoperative.
| Attributes | |
| ACN | 135245 |
| Time | |
| Date | 199001 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | msl bound lower : 1540 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pit tower : pit |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach landing other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 5765 flight time type : 980 |
| ASRS Report | 135245 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
From yip to sdf #1 communication was lost. Center was unable to contact us. We ended up at 15,000' MSL over abb (+/- 30 NM outside sdf). We reestablished contact on #2 communication with sdf approach. During the approach phase in our second leg, ATC was vectoring us for the ILS 28L, runway was changed to 28R. My copilot was flying left seat and was set up for the ILS 28R. ATC established us on the localizer for 28R. At 3000' MSL we received the outer marker and no glide slope intercept so we went down to localizer only minimums. I asked ATC (tower at pit) about glide slope problem for 28R. He indicated no problems (ILS full operational) and advised us about the low altitude alert. We were at localizer minimums. We continued inbound and landed. On the ground again I told tower we never received the glide slope (not even close in). He told us we were descending for localizer minimums outside the outer marker. My conclusions were that we have navigation problems and more than likely received the outer marker for 28L as down in my sketch. On our third leg sdf to mdt after being cleared into position and hold (requested to be ready for an immediate) our #1 communication again failed, when we reestablished contact with pit tower on communication #2 an air carrier flight had gone around.
Original NASA ASRS Text
Title: ATX SMT STARTED DESCENT OUTSIDE THE IAF. DESCENDED ONLY TO LOC MINIMUMS BECAUSE THE FLT CREW THOUGHT THE GLIDE SLOPE WAS INOPERATIVE.
Narrative: FROM YIP TO SDF #1 COM WAS LOST. CENTER WAS UNABLE TO CONTACT US. WE ENDED UP AT 15,000' MSL OVER ABB (+/- 30 NM OUTSIDE SDF). WE REESTABLISHED CONTACT ON #2 COM WITH SDF APCH. DURING THE APCH PHASE IN OUR SECOND LEG, ATC WAS VECTORING US FOR THE ILS 28L, RWY WAS CHANGED TO 28R. MY COPLT WAS FLYING LEFT SEAT AND WAS SET UP FOR THE ILS 28R. ATC ESTABLISHED US ON THE LOC FOR 28R. AT 3000' MSL WE RECEIVED THE OUTER MARKER AND NO GLIDE SLOPE INTERCEPT SO WE WENT DOWN TO LOC ONLY MINIMUMS. I ASKED ATC (TWR AT PIT) ABOUT GLIDE SLOPE PROBLEM FOR 28R. HE INDICATED NO PROBLEMS (ILS FULL OPERATIONAL) AND ADVISED US ABOUT THE LOW ALT ALERT. WE WERE AT LOC MINIMUMS. WE CONTINUED INBND AND LANDED. ON THE GND AGAIN I TOLD TWR WE NEVER RECEIVED THE GLIDE SLOPE (NOT EVEN CLOSE IN). HE TOLD US WE WERE DESCENDING FOR LOC MINIMUMS OUTSIDE THE OUTER MARKER. MY CONCLUSIONS WERE THAT WE HAVE NAV PROBLEMS AND MORE THAN LIKELY RECEIVED THE OUTER MARKER FOR 28L AS DOWN IN MY SKETCH. ON OUR THIRD LEG SDF TO MDT AFTER BEING CLRED INTO POSITION AND HOLD (REQUESTED TO BE READY FOR AN IMMEDIATE) OUR #1 COM AGAIN FAILED, WHEN WE REESTABLISHED CONTACT WITH PIT TWR ON COM #2 AN ACR FLT HAD GONE AROUND.
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.