<< >> NASA ASRS Report 429580, February 1999

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.

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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.