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I90 TRACON controller and EMB175 flight crew reported the E175s have an FMS anomaly where a crossing restriction is programmed as 'at or above' when it should be 'at.'
| Attributes | |
| ACN | 1493528 |
| Time | |
| Date | 201711 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | IAH.Airport |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 170/175 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | Other RNAV Runway 27 STAR LINKK1 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 3 |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
I was working final and cleared aircraft X on the RNAV approach from a fix at 4000 feet. The next fix had a crossing restriction of 3000 feet. Aircraft X was not descending and I asked the pilot if his FMS shows the fix at 3000 feet; or at or above 3000 feet. The pilot said that his FMS shows that fix is at or above 3000 feet. I indicated that the approach plate has the fix at 3000 feet and told them to descend. I told the supervisor on duty about the situation. There have been multiple E175s having this issue where the FMS shows an 'at or above' altitude on the approach; and the approach plate is an 'at' altitude. Have [company] double check their FMS to make sure it matches the approach plates.
Original NASA ASRS Text
Title: I90 TRACON Controller and EMB175 flight crew reported the E175s have an FMS anomaly where a crossing restriction is programmed as 'at or above' when it should be 'at.'
Narrative: I was working Final and cleared Aircraft X on the RNAV approach from a fix at 4000 feet. The next fix had a crossing restriction of 3000 feet. Aircraft X was not descending and I asked the pilot if his FMS shows the fix at 3000 feet; or at or above 3000 feet. The pilot said that his FMS shows that fix is at or above 3000 feet. I indicated that the approach plate has the fix AT 3000 feet and told them to descend. I told the Supervisor on duty about the situation. There have been multiple E175s having this issue where the FMS shows an 'At or Above' altitude on the approach; and the approach plate is an 'AT' altitude. Have [Company] double check their FMS to make sure it matches the approach plates.
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.