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A B737-300 captain, PNF, became distraction by the disparity between his airspeed indicator and the first officer's while on approach to iah. Thinking about the airspeed, he inadvertently set the GS intercept altitude 2 mi too early, which may have caused them to briefly exit the floor of class B airspace.
| Attributes | |
| ACN | 452450 |
| Time | |
| Date | 199910 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : iah.airport |
| State Reference | TX |
| Altitude | msl bound lower : 2000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : i90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | arrival : profile descent |
| 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 : 250 flight time total : 17500 flight time type : 1500 |
| ASRS Report | 452450 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument |
| Events | |
| Anomaly | airspace violation : exit altitude deviation : excursion from assigned altitude non adherence : far non adherence : clearance non adherence : company policies non adherence : published procedure |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : returned to original clearance flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During the approach, first officer's and captain's airspeed showing different speeds. First officer was PF. I set the altimeter to 2000 ft, which is the GS intercept altitude. I set this altitude approximately 2 mi too soon, which may have caused us to briefly exit the bottom of the class B airspace. No terrain clearance issues were involved, and the flight landed normally. I should not have been distraction by the airspeed problem.
Original NASA ASRS Text
Title: A B737-300 CAPT, PNF, BECAME DISTR BY THE DISPARITY BTWN HIS AIRSPD INDICATOR AND THE FO'S WHILE ON APCH TO IAH. THINKING ABOUT THE AIRSPD, HE INADVERTENTLY SET THE GS INTERCEPT ALT 2 MI TOO EARLY, WHICH MAY HAVE CAUSED THEM TO BRIEFLY EXIT THE FLOOR OF CLASS B AIRSPACE.
Narrative: DURING THE APCH, FO'S AND CAPT'S AIRSPD SHOWING DIFFERENT SPDS. FO WAS PF. I SET THE ALTIMETER TO 2000 FT, WHICH IS THE GS INTERCEPT ALT. I SET THIS ALT APPROX 2 MI TOO SOON, WHICH MAY HAVE CAUSED US TO BRIEFLY EXIT THE BOTTOM OF THE CLASS B AIRSPACE. NO TERRAIN CLRNC ISSUES WERE INVOLVED, AND THE FLT LANDED NORMALLY. I SHOULD NOT HAVE BEEN DISTR BY THE AIRSPD PROB.
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.