|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||airport : sjc|
|Altitude||msl bound lower : 3000|
msl bound upper : 3000
|Operator||general aviation : personal|
|Make Model Name||Small Aircraft, Low Wing, 1 Eng, Retractable Gear|
|Flight Phase||cruise other|
|Function||flight crew : single pilot|
|Qualification||pilot : cfi|
pilot : commercial
pilot : instrument
|Experience||flight time last 90 days : 30|
flight time total : 1300
flight time type : 3
|Function||instruction : instructor|
|Qualification||pilot : instrument|
pilot : cfi
|Anomaly||other anomaly other|
|Independent Detector||other flight crewa|
|Resolutory Action||none taken : anomaly accepted|
|Consequence||faa : reviewed incident with flight crew|
|Primary Problem||Navigational Facility|
|Air Traffic Incident||other|
Isjc - 110.9, runway 30. Islv - 110.9, runway 12. Identification's are so close, it's very easy to get a back course west/O realizing it. Accident waiting to happen. Charts give no indication of possible confusion. Callback conversation with reporter revealed the following: was having problems identifying the ILS, last digits were garbled. Became confused as to indication on his CDI since he assumed 30 ILS was transmitting when in fact 12 was in use. Would like to see frequency changed. Explained probably interference problems and the shortage of available frequency. Suggested he contact the FAA hotline or flight inspection field office. Advised to be very careful of the information he is seeing when the identify is not clear.
Original NASA ASRS Text
Title: SAME ILS FREQ FOR RWY 30 AND 12. DIFFERENT IDENTIFICATION.
Narrative: ISJC - 110.9, RWY 30. ISLV - 110.9, RWY 12. ID'S ARE SO CLOSE, IT'S VERY EASY TO GET A BACK COURSE W/O REALIZING IT. ACCIDENT WAITING TO HAPPEN. CHARTS GIVE NO INDICATION OF POSSIBLE CONFUSION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: WAS HAVING PROBS IDENTIFYING THE ILS, LAST DIGITS WERE GARBLED. BECAME CONFUSED AS TO INDICATION ON HIS CDI SINCE HE ASSUMED 30 ILS WAS XMITTING WHEN IN FACT 12 WAS IN USE. WOULD LIKE TO SEE FREQ CHANGED. EXPLAINED PROBABLY INTERFERENCE PROBS AND THE SHORTAGE OF AVAILABLE FREQ. SUGGESTED HE CONTACT THE FAA HOTLINE OR FLT INSPECTION FIELD OFFICE. ADVISED TO BE VERY CAREFUL OF THE INFO HE IS SEEING WHEN THE IDENT IS NOT CLEAR.
Data retrieved from NASA's ASRS site as of August 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.