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A VFR PA28 and an IFR PC12 suffered an near midair collision on final approach when the PC12 pilot failed to adjust his altimeter to the local pressure and was thus 500 ft below his assigned altitude.
| Attributes | |
| ACN | 911332 |
| Time | |
| Date | 201009 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | PA-28 Cherokee/Archer/Dakota/Pillan/Warrior |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Final Approach |
| Flight Plan | None |
| Aircraft 2 | |
| Make Model Name | PC-12 |
| Flight Phase | Final Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Instructor |
| Qualification | Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 1440 Flight Crew Type 490 |
| Events | |
| Anomaly | Conflict NMAC |
| Miss Distance | Horizontal 0 Vertical 300 |
Narrative:
Aircraft one was on right base turning final for runway 21 and cleared to land; aircraft two was on straight in to 21 and given clearance by tower to 'maintain 3;000 ft till advised continue straight in 21 and expect a right break over midfield.' aircraft two read back correctly; but was actually maintaining 2;500 ft and crossed over aircraft one on final; tower asked aircraft two to say altitude; readback was '3;000 ft' tower then advised that mode C indicated 2;500 and gave the local altimeter setting to aircraft two; then aircraft two replied 'oops; sorry; climbing back up.'
Original NASA ASRS Text
Title: A VFR PA28 and an IFR PC12 suffered an NMAC on final approach when the PC12 pilot failed to adjust his altimeter to the local pressure and was thus 500 FT below his assigned altitude.
Narrative: Aircraft one was on right base turning final for Runway 21 and cleared to land; aircraft two was on straight in to 21 and given clearance by Tower to 'maintain 3;000 FT till advised continue straight in 21 and expect a right break over midfield.' Aircraft two read back correctly; but was actually maintaining 2;500 FT and crossed over aircraft one on final; Tower asked aircraft two to say altitude; readback was '3;000 FT' Tower then advised that Mode C indicated 2;500 and gave the local altimeter setting to aircraft two; then aircraft two replied 'oops; sorry; climbing back up.'
Data retrieved from NASA's ASRS site as of April 2012 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.