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An SA227 flight crew prematurely descended 300 ft below their assigned altitude when 12 NM west of road, va.
| Attributes | |
| ACN | 511611 |
| Time | |
| Date | 200105 |
| Day | Sat |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| State Reference | VA |
| Altitude | msl bound lower : 4200 msl bound upper : 4500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tracon : roa.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | SA-227 AC Metro III |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : rwy 6 other ndb |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 4200 flight time type : 300 |
| ASRS Report | 511611 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : ground less severe non adherence : clearance non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : laws other controllera |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Chart Or Publication Airspace Structure ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On approach into roa, va, ATC issued approach clearance with instructions to maintain '5000 ft until established' on the localizer. I intercepted the localizer about 15 NM from the airport and descended to 4200 ft. ATC advised me that I was way below GS interception altitude and was dangerously close to the terrain. Upon review of the approach plate, the GS interception altitude was 4500 ft. I climbed to 4500 ft and resumed the approach. Upon further review of the approach plate, 4200 ft is the altitude to fly the lda 6 roa approach without the GS. Considering that I joined the final approach course within 10 NM of the callahan NDB, both the 4500 ft GS interception altitude and the 4200 ft localizer only approach should have provided me with adequate obstacle clearance. With that in mind, I don't know why ATC was so mad with me.
Original NASA ASRS Text
Title: AN SA227 FLC PREMATURELY DSNDED 300 FT BELOW THEIR ASSIGNED ALT WHEN 12 NM W OF ROAD, VA.
Narrative: ON APCH INTO ROA, VA, ATC ISSUED APCH CLRNC WITH INSTRUCTIONS TO MAINTAIN '5000 FT UNTIL ESTABLISHED' ON THE LOC. I INTERCEPTED THE LOC ABOUT 15 NM FROM THE ARPT AND DSNDED TO 4200 FT. ATC ADVISED ME THAT I WAS WAY BELOW GS INTERCEPTION ALT AND WAS DANGEROUSLY CLOSE TO THE TERRAIN. UPON REVIEW OF THE APCH PLATE, THE GS INTERCEPTION ALT WAS 4500 FT. I CLBED TO 4500 FT AND RESUMED THE APCH. UPON FURTHER REVIEW OF THE APCH PLATE, 4200 FT IS THE ALT TO FLY THE LDA 6 ROA APCH WITHOUT THE GS. CONSIDERING THAT I JOINED THE FINAL APCH COURSE WITHIN 10 NM OF THE CALLAHAN NDB, BOTH THE 4500 FT GS INTERCEPTION ALT AND THE 4200 FT LOC ONLY APCH SHOULD HAVE PROVIDED ME WITH ADEQUATE OBSTACLE CLRNC. WITH THAT IN MIND, I DON'T KNOW WHY ATC WAS SO MAD WITH ME.
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.