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Flight crew of a B737-300 inadvertently exited class B airspace when they descended 12 mi out from the OM on an ILS approach.
| Attributes | |
| ACN | 429580 |
| Time | |
| Date | 199902 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : iah.airport |
| State Reference | TX |
| Altitude | msl single value : 2000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : i90.tracon tower : anc.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 27 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 18500 flight time type : 1000 |
| ASRS Report | 429580 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | airspace violation : exit non adherence : far |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Airspace Structure Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight from msy to iah. We were given a heading to join the runway 27 ILS and cleared for the approach to cross the marker at or below 2000 ft. We descended to 2000 ft to join the GS just outside the marker which would put us below 2000 ft at the marker. This may have caused us to fly below the 3000 ft floor of class B airspace for a short distance. It is common to receive a clearance to 2000 ft when doing approachs to iah. I should have been more diligent in observing the 2000 ft floor of class B at 10 mi.
Original NASA ASRS Text
Title: FLC OF A B737-300 INADVERTENTLY EXITED CLASS B AIRSPACE WHEN THEY DSNDED 12 MI OUT FROM THE OM ON AN ILS APCH.
Narrative: FLT FROM MSY TO IAH. WE WERE GIVEN A HDG TO JOIN THE RWY 27 ILS AND CLRED FOR THE APCH TO CROSS THE MARKER AT OR BELOW 2000 FT. WE DSNDED TO 2000 FT TO JOIN THE GS JUST OUTSIDE THE MARKER WHICH WOULD PUT US BELOW 2000 FT AT THE MARKER. THIS MAY HAVE CAUSED US TO FLY BELOW THE 3000 FT FLOOR OF CLASS B AIRSPACE FOR A SHORT DISTANCE. IT IS COMMON TO RECEIVE A CLRNC TO 2000 FT WHEN DOING APCHS TO IAH. I SHOULD HAVE BEEN MORE DILIGENT IN OBSERVING THE 2000 FT FLOOR OF CLASS B AT 10 MI.
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.