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ATC intervened to advise pilot of small aircraft sel check altitude during ILS approach. Pilot determined that the GS was giving an erroneous reading and diverted to another airport which was VFR.
| Attributes | |
| ACN | 274688 |
| Time | |
| Date | 199406 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : ack airport : mvy |
| State Reference | MA |
| Altitude | msl bound lower : 1000 msl bound upper : 1600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : fmh tower : hnl |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 40 flight time total : 1750 flight time type : 420 |
| ASRS Report | 274688 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : provided flight assist flight crew : exited adverse environment other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
VFR flight from ipt to ack. Approximately 90 mi from destination ATIS broadcast informed IFR conditions. Picked up local IFR clearance. While in VMC conditions cleared for ILS 24, maintain 1700 ft until established. After localizer intercept, began 400 FPM descent. Instrument indications indicated on localizer, on GS. Cleared to land by ack tower. At crossing OM, checked altitude, noticed published altitude for GS intercept to be 1600 ft, altimeter indicated 1000 ft. Tower advised, approach advised to check altitude. I confirmed to tower my aircraft GS was unreliable as it was still indicating on GS. While still in VMC conditions, I elected to divert to marthas vineyard, mvy, and landed with a contact approach. Aircraft is to be repaired at local radio shop.
Original NASA ASRS Text
Title: ATC INTERVENED TO ADVISE PLT OF SMA SEL CHK ALT DURING ILS APCH. PLT DETERMINED THAT THE GS WAS GIVING AN ERRONEOUS READING AND DIVERTED TO ANOTHER ARPT WHICH WAS VFR.
Narrative: VFR FLT FROM IPT TO ACK. APPROX 90 MI FROM DEST ATIS BROADCAST INFORMED IFR CONDITIONS. PICKED UP LCL IFR CLRNC. WHILE IN VMC CONDITIONS CLRED FOR ILS 24, MAINTAIN 1700 FT UNTIL ESTABLISHED. AFTER LOC INTERCEPT, BEGAN 400 FPM DSCNT. INST INDICATIONS INDICATED ON LOC, ON GS. CLRED TO LAND BY ACK TWR. AT XING OM, CHKED ALT, NOTICED PUBLISHED ALT FOR GS INTERCEPT TO BE 1600 FT, ALTIMETER INDICATED 1000 FT. TWR ADVISED, APCH ADVISED TO CHK ALT. I CONFIRMED TO TWR MY ACFT GS WAS UNRELIABLE AS IT WAS STILL INDICATING ON GS. WHILE STILL IN VMC CONDITIONS, I ELECTED TO DIVERT TO MARTHAS VINEYARD, MVY, AND LANDED WITH A CONTACT APCH. ACFT IS TO BE REPAIRED AT LCL RADIO SHOP.
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.