Flight crew of mdt may have triggered ATC low altitude alerts while shooting a non precision approach to a non-towered airport. Did not receive alert notification due to switching to airport advisory frequency when cleared for the approach.

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Attributes
ACN	723876
Time
Date	200701
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach landing : missed approach
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 70 flight time total : 3300 flight time type : 1000
ASRS Report	723876
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	inflight encounter : weather other spatial deviation other spatial deviation
Independent Detector	atc equipment : msaw other controllera
Resolutory Action	flight crew : diverted to alternate none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Airport ATC Human Performance Environmental Factor
Primary Problem	Ambiguous

Narrative:

Approach cleared us for a non-precision GPS a approach to a non towered airport. During the approach ATC handed us off to the advisory frequency for the non towered destination airport. All step-down fixes; altitudes and MDA altitudes were flown as per the published approach. The approach resulted in a missed approach. During the missed approach contact was made with ATC and vectors given to the alternate airport for a precision approach. An uneventful precision approach was completed and landing made. Upon entering the FBO a flight crew notified us that ATC had attempted to contact us after they handed us off to advisory frequency regarding a low altitude alert. The flight crew in the FBO was being vectored behind us for the same non precision approach we were flying. Once they heard us go missed they diverted to the same alternate airport as us and were on the same ATC frequency. During the missed approach ATC did not inform us of any previous low altitude alerts or any new altimeter settings. After approximately 30 mins on the ground at the alternate airport the WX improved at the original destination airport. A short flight was made with full vectors for the same non-precision GPS a approach with a landing and canceling of IFR on the ground. ATC did not notify us of any altitude alerts.

Original NASA ASRS Text

Title: FLT CREW OF MDT MAY HAVE TRIGGERED ATC LOW ALT ALERTS WHILE SHOOTING A NON PRECISION APCH TO A NON-TOWERED ARPT. DID NOT RECEIVE ALERT NOTIFICATION DUE TO SWITCHING TO ARPT ADVISORY FREQ WHEN CLRED FOR THE APCH.

Narrative: APCH CLRED US FOR A NON-PRECISION GPS A APCH TO A NON TOWERED ARPT. DURING THE APCH ATC HANDED US OFF TO THE ADVISORY FREQ FOR THE NON TOWERED DEST ARPT. ALL STEP-DOWN FIXES; ALTS AND MDA ALTS WERE FLOWN AS PER THE PUBLISHED APCH. THE APCH RESULTED IN A MISSED APCH. DURING THE MISSED APCH CONTACT WAS MADE WITH ATC AND VECTORS GIVEN TO THE ALTERNATE ARPT FOR A PRECISION APCH. AN UNEVENTFUL PRECISION APCH WAS COMPLETED AND LNDG MADE. UPON ENTERING THE FBO A FLT CREW NOTIFIED US THAT ATC HAD ATTEMPTED TO CONTACT US AFTER THEY HANDED US OFF TO ADVISORY FREQ REGARDING A LOW ALT ALERT. THE FLT CREW IN THE FBO WAS BEING VECTORED BEHIND US FOR THE SAME NON PRECISION APCH WE WERE FLYING. ONCE THEY HEARD US GO MISSED THEY DIVERTED TO THE SAME ALTERNATE ARPT AS US AND WERE ON THE SAME ATC FREQ. DURING THE MISSED APCH ATC DID NOT INFORM US OF ANY PREVIOUS LOW ALT ALERTS OR ANY NEW ALTIMETER SETTINGS. AFTER APPROX 30 MINS ON THE GND AT THE ALTERNATE ARPT THE WX IMPROVED AT THE ORIGINAL DEST ARPT. A SHORT FLT WAS MADE WITH FULL VECTORS FOR THE SAME NON-PRECISION GPS A APCH WITH A LNDG AND CANCELING OF IFR ON THE GND. ATC DID NOT NOTIFY US OF ANY ALT ALERTS.

Data retrieved from NASA's ASRS site as of January 2009 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.