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While on a vector for the ILS runway 24 approach at ack, the pilot of a light twin became confused over frequency assignment and descended below the last altitude given in a clearance. When communication was reestablished, the ATCT tower controller alerted the pilot to the low altitude and told him to miss the approach.
| Attributes | |
| ACN | 340637 |
| Time | |
| Date | 199607 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ack |
| State Reference | MA |
| Altitude | msl bound lower : 600 msl bound upper : 1600 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pvd |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 30 flight time total : 1850 flight time type : 450 |
| ASRS Report | 340637 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cape approach gave us a turn to intercept the localizer, a descent from 2000 ft to 1600 ft, and a frequency change to 118.2. I knew the correct tower frequency was 118.3 and had previously tuned this. Unable to get a quick response on 118.3, I switched to 118.2, then back to approach for clarification. During the radio confusion, I neglected to arrest my descent. Upon reaching tower, still outside FAF, he advised me I was 1000 ft below assigned altitude and to execute the missed, which I did. The following approach was normal. I had forgotten to 'fly the airplane,' first.
Original NASA ASRS Text
Title: WHILE ON A VECTOR FOR THE ILS RWY 24 APCH AT ACK, THE PLT OF A LIGHT TWIN BECAME CONFUSED OVER FREQ ASSIGNMENT AND DSNDED BELOW THE LAST ALT GIVEN IN A CLRNC. WHEN COM WAS REESTABLISHED, THE ATCT TWR CTLR ALERTED THE PLT TO THE LOW ALT AND TOLD HIM TO MISS THE APCH.
Narrative: CAPE APCH GAVE US A TURN TO INTERCEPT THE LOC, A DSCNT FROM 2000 FT TO 1600 FT, AND A FREQ CHANGE TO 118.2. I KNEW THE CORRECT TWR FREQ WAS 118.3 AND HAD PREVIOUSLY TUNED THIS. UNABLE TO GET A QUICK RESPONSE ON 118.3, I SWITCHED TO 118.2, THEN BACK TO APCH FOR CLARIFICATION. DURING THE RADIO CONFUSION, I NEGLECTED TO ARREST MY DSCNT. UPON REACHING TWR, STILL OUTSIDE FAF, HE ADVISED ME I WAS 1000 FT BELOW ASSIGNED ALT AND TO EXECUTE THE MISSED, WHICH I DID. THE FOLLOWING APCH WAS NORMAL. I HAD FORGOTTEN TO 'FLY THE AIRPLANE,' FIRST.
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.