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B737-700 captain reported ATC assigned airspeed 250 kts below the ord class B airspace on an RNAV arrival into the ord area.
| Attributes | |
| ACN | 1633050 |
| Time | |
| Date | 201904 |
| Place | |
| Locale Reference | C90.TRACON |
| State Reference | IL |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Route In Use | Other RNP Y |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 401 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Overshoot Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Speed All Types |
Narrative:
We were descending to 6;000 feet on the RNAV arrival. During the descent; we got cleared to an intersection and to cross it at 3;000 feet. The first officer selected 3;000 feet and hit lvl chg. We then got cleared for the RNAV approach. He verified 3;000 feet in FMC and set 1;500 feet in the altitude selector. ATC also wanted us to maintain 250 knots until advised. I was concerned with class B airspace and the 210 restriction at a fix; so we discussed the airspeed issue and missed the fact that we were not in VNAV. The aircraft descended below 3;000 feet prior to the fix and ATC asked us about it. We immediately climbed back up to 3;000 feet and crossed the fix to comply with the clearance. We continued the approach with no further issues and landed safely.
Original NASA ASRS Text
Title: B737-700 Captain reported ATC assigned airspeed 250 kts below the ORD Class B airspace on an RNAV arrival into the ORD area.
Narrative: We were descending to 6;000 feet on the RNAV Arrival. During the descent; we got cleared to an intersection and to cross it at 3;000 feet. The First Officer selected 3;000 feet and hit LVL CHG. We then got cleared for the RNAV Approach. He verified 3;000 feet in FMC and set 1;500 feet in the altitude selector. ATC also wanted us to maintain 250 knots until advised. I was concerned with Class B airspace and the 210 restriction at a fix; so we discussed the airspeed issue and missed the fact that we were not in VNAV. The aircraft descended below 3;000 feet prior to the fix and ATC asked us about it. We immediately climbed back up to 3;000 feet and crossed the fix to comply with the clearance. We continued the approach with no further issues and landed safely.
Data retrieved from NASA's ASRS site 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.