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B737 pilot reported the altitude displayed on both pfds indicated a lower altitude than the expected at FAF.
| Attributes | |
| ACN | 1565196 |
| Time | |
| Date | 201807 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | RNO.Airport |
| State Reference | NV |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Other / Unknown |
Narrative:
While on a visual approach (monitoring the ILS glideslope as backup) to 34L at rno; the flight crew noticed a discrepancy in altitude at the appropriate 'crosscheck' altitude point. The 'crosscheck' altitude at epose is 8300' MSL. While visual with the runway and passing epose; the aircraft was on the ILS glidepath; however; the altitude displayed on both pfds indicated a lower altitude than the expected 8300' MSL at epose. We (the flight crew) verified between each other and confirmed that the same and correct altimeter setting (30.06) was set. We also verified altimeter setting and altitude at epose with tower. Additionally; altitude readouts were verified within tolerance pre and post flight on the ground. This is a safety concern; because all systems (aircraft and airfield) seemed to be working properly; yet the altitude was off at the crosscheck point. Additionally; on a previous occasion; a similar situation was experienced; as well as hearing the same from another aircraft from another carrier on the same day.
Original NASA ASRS Text
Title: B737 pilot reported the altitude displayed on both PFDs indicated a lower altitude than the expected at FAF.
Narrative: While on a visual approach (monitoring the ILS glideslope as backup) to 34L at RNO; the flight crew noticed a discrepancy in altitude at the appropriate 'crosscheck' altitude point. The 'crosscheck' altitude at EPOSE is 8300' MSL. While visual with the runway and passing EPOSE; the aircraft was on the ILS glidepath; however; the altitude displayed on both PFDs indicated a lower altitude than the expected 8300' MSL at EPOSE. We (the flight crew) verified between each other and confirmed that the same and correct altimeter setting (30.06) was set. We also verified altimeter setting and altitude at EPOSE with Tower. Additionally; altitude readouts were verified within tolerance pre and post flight on the ground. This is a Safety concern; because all systems (aircraft and airfield) seemed to be working properly; yet the altitude was off at the crosscheck point. Additionally; on a previous occasion; a similar situation was experienced; as well as hearing the same from another aircraft from another carrier on the same day.
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.