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ATC's use of non standard phraseology leads a GA pilot to believe hs is cleared for an approach. The result is an approach and landing without proper clearance.
| Attributes | |
| ACN | 510910 |
| Time | |
| Date | 200105 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mkl.airport |
| State Reference | TN |
| Altitude | msl bound lower : 434 msl bound upper : 2100 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tower : mkl.tower tower : bos.tower |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent : approach landing : roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 120 flight time total : 6000 flight time type : 900 |
| ASRS Report | 510910 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude incursion : landing without clearance non adherence : published procedure non adherence : clearance other spatial deviation |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
ZME had vectored me at 3000 ft onto the localizer about 6 mi outside the OM and had also given holding instructions at the VOR which is on the field, then immediately following asked me if I wanted to take a look. I said yes, and he said 'descend down to 2100 ft MSL' which is the minimum approach altitude. Having been asked if I wanted to take a look, I took that as being cleared for the approach. I then descended on down the GS inside the OM. Shortly after, ZME declared radar contact lost. I then saw the runway and landed. Upon landing, the tower informed me that I had not been given clearance to shoot the approach by ZME or clearance to land by the tower. WX at the time, according to the ASOS was 1.2 mi and 100 ft overcast. The controling visibility was 1/2 mi. Contributing factors: incorrect terminology used by ZME and the pilot not questioning that terminology.
Original NASA ASRS Text
Title: ATC'S USE OF NON STANDARD PHRASEOLOGY LEADS A GA PLT TO BELIEVE HS IS CLRED FOR AN APCH. THE RESULT IS AN APCH AND LNDG WITHOUT PROPER CLRNC.
Narrative: ZME HAD VECTORED ME AT 3000 FT ONTO THE LOC ABOUT 6 MI OUTSIDE THE OM AND HAD ALSO GIVEN HOLDING INSTRUCTIONS AT THE VOR WHICH IS ON THE FIELD, THEN IMMEDIATELY FOLLOWING ASKED ME IF I WANTED TO TAKE A LOOK. I SAID YES, AND HE SAID 'DSND DOWN TO 2100 FT MSL' WHICH IS THE MINIMUM APCH ALT. HAVING BEEN ASKED IF I WANTED TO TAKE A LOOK, I TOOK THAT AS BEING CLRED FOR THE APCH. I THEN DSNDED ON DOWN THE GS INSIDE THE OM. SHORTLY AFTER, ZME DECLARED RADAR CONTACT LOST. I THEN SAW THE RWY AND LANDED. UPON LNDG, THE TWR INFORMED ME THAT I HAD NOT BEEN GIVEN CLRNC TO SHOOT THE APCH BY ZME OR CLRNC TO LAND BY THE TWR. WX AT THE TIME, ACCORDING TO THE ASOS WAS 1.2 MI AND 100 FT OVCST. THE CTLING VISIBILITY WAS 1/2 MI. CONTRIBUTING FACTORS: INCORRECT TERMINOLOGY USED BY ZME AND THE PLT NOT QUESTIONING THAT TERMINOLOGY.
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.