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An emb-145 captain reported losing reliable airspeed indications while operating in IMC.
| Attributes | |
| ACN | 1342763 |
| Time | |
| Date | 201603 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZHU.ARTCC |
| State Reference | TX |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 145 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
A line of thunderstorms was approaching pns from the west. After discussions with ATC and dispatch; we elected to hold at gcv VOR to try to let the storms pass pns. After about [45 minutes] of holding; in IMC; at FL350; we decided to divert to ZZZ. We notified ATC of our intentions; and they gave us a new heading and a lower altitude. Upon commencing our descent; we got a sps advance caution on the EICAS. Immediately following the message; the first officer (first officer) informed me [that] my airspeed was low and trending lower. We both realized very quickly that the captain (ca) side airspeed was unreliable. I continued the descent and turned off the autopilot while the first officer ran the QRH. The fos airspeed seemed to be functioning properly; at first. We informed ATC that we would need a lower altitude and had an emergency in progress. The ca airspeed eventually went blank; and the fos went as low as about 150KIAS. The event continued for about 4 to 5 minutes; and both airspeeds returned to functioning normally in the mid 20's. After descending to 11;000 feet; and verifying that all airspeed indicators were indicating correctly with our pitch/power tables; and verifying airspeed and altitude with ATC; and with the ground in sight; we cancelled the emergency and landed with no event.threats: no airspeed indicationavoid holding in IMC. If possible.
Original NASA ASRS Text
Title: An EMB-145 Captain reported losing reliable airspeed indications while operating in IMC.
Narrative: A line of thunderstorms was approaching PNS from the west. After discussions with ATC and Dispatch; we elected to hold at GCV VOR to try to let the storms pass PNS. After about [45 minutes] of holding; in IMC; at FL350; we decided to divert to ZZZ. We notified ATC of our intentions; and they gave us a new heading and a lower altitude. Upon commencing our descent; we got a SPS ADVANCE caution on the EICAS. Immediately following the message; the First Officer (FO) informed me [that] my airspeed was low and trending lower. We both realized very quickly that the Captain (CA) side airspeed was unreliable. I continued the descent and turned off the autopilot while the FO ran the QRH. The FOs airspeed seemed to be functioning properly; at first. We informed ATC that we would need a lower altitude and had an emergency in progress. The CA airspeed eventually went blank; and the FOs went as low as about 150KIAS. The event continued for about 4 to 5 minutes; and both airspeeds returned to functioning normally in the mid 20's. After descending to 11;000 feet; and verifying that all airspeed indicators were indicating correctly with our pitch/power tables; and verifying airspeed and altitude with ATC; and with the ground in sight; we cancelled the emergency and landed with no event.Threats: No airspeed indicationAvoid holding in IMC. If possible.
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.