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Be-400 captain reported loss of air speed indication at FL400 during cruise.
| Attributes | |
| ACN | 1649163 |
| Time | |
| Date | 201905 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Beechjet 400 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pitot-Static System |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
At 30 min cruise flight @ FL400; captain (PF) noticed lt side pfd (primary flight display) IAS flag; and verbalized to PNF (pilot not flying). PF (pilot flying) compared pfds and stby asi (airspeed indicator). Rt side pfd and stby asis indicated approximately 20 kts faster (220 kts) than lt side. Over the course of 30 sec; airspeed continued to decay below 200 kts on lt side pfd and decreased at same rate on both rt side pfd and stby. PF deemed a descent necessary to trade altitude for airspeed. PNF asked ATC for lower altitude. PF initiated a ~3000 fpm descent and airspeed continued to decay toward 140 kts on all asis. PF quickly realized all airspeed information was erroneous and suspected stuck pitot. Both pilots verified pitot heats-on and circuit breakers-in. PF decreased descent to 1000 fpm; set a known power setting and referenced aoa .2. IAS pegged at 40 kts on both pfds and 0 kts on stby. PNF [requested priority handling] and asked for vectors to ZZZ. PNF ran loss of airspeed indication checklist and reviewed loss of airspeed approach checklist. All asis returned to normal @ ~FL260 and indicated similar airspeeds. PF flew ILS uneventfully into ZZZ.
Original NASA ASRS Text
Title: BE-400 Captain reported loss of air speed indication at FL400 during cruise.
Narrative: At 30 min cruise flight @ FL400; Captain (PF) noticed LT Side PFD (Primary Flight Display) IAS flag; and verbalized to PNF (Pilot Not Flying). PF (Pilot Flying) compared PFDs and STBY ASI (Airspeed Indicator). RT Side PFD and STBY ASIs indicated approximately 20 kts faster (220 kts) than LT Side. Over the course of 30 sec; airspeed continued to decay below 200 kts on LT Side PFD and decreased at same rate on both RT side PFD and STBY. PF deemed a descent necessary to trade altitude for airspeed. PNF asked ATC for lower altitude. PF initiated a ~3000 fpm descent and airspeed continued to decay toward 140 kts on all ASIs. PF quickly realized all airspeed information was erroneous and suspected stuck pitot. Both pilots verified pitot heats-on and circuit breakers-in. PF decreased descent to 1000 fpm; set a known power setting and referenced AOA .2. IAS pegged at 40 kts on both PFDs and 0 kts on STBY. PNF [requested priority handling] and asked for vectors to ZZZ. PNF ran loss of airspeed indication checklist and reviewed loss of airspeed approach checklist. All ASIs returned to normal @ ~FL260 and indicated similar airspeeds. PF flew ILS uneventfully into ZZZ.
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.