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A DA50EX experienced fluctuating airspeed and altitude indications after takeoff. The crew could not determine the cause; therefore an emergency was declared as they diverted to a nearby VMC airport.
| Attributes | |
| ACN | 929169 |
| Time | |
| Date | 201101 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.TRACON |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Falcon 50 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise Climb Initial Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Airspeed Indicator |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 50 Flight Crew Total 14000 Flight Crew Type 2000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
[I] took off with ceiling less than 1;000 ft. After gear retraction; at about 400 ft; egpws windshear warning activated; airspeed rolled back from 140 KTS; 130 KTS; 120 KTS; 115 KTS. The altimeter showed a climb; copilot and standby instruments followed pilot side. At 4;000 ft altimeter jumped 400 ft to 4;400. We declared an emergency. [I] asked for a vector to return to land. [I was] told to descend to 2;000 ft. On the way down egpws went off too low; we were indicating 4;000 ft on the altimeters. We asked for a clearance to VFR on top. We reached 6;000 ft then requested 8;000 ft and a destination VFR in the area. Enroute checklists were run. No miscompare warnings indicated; but pilot's altimeter would jump 500 ft then go back down. Air data computer's were checked; ahrs checked; static selectors checked normal then; then back; no change. Ground speed versus IAS with wind looked like IAS was indicating 30 KTS too fast. The divert airport was VFR and landing uneventful. Aircraft has just come out of avionics shop to replace stall vains and had static check done with no problems.
Original NASA ASRS Text
Title: A DA50EX experienced fluctuating airspeed and altitude indications after takeoff. The crew could not determine the cause; therefore an emergency was declared as they diverted to a nearby VMC airport.
Narrative: [I] took off with ceiling less than 1;000 FT. After gear retraction; at about 400 FT; EGPWS windshear warning activated; airspeed rolled back from 140 KTS; 130 KTS; 120 KTS; 115 KTS. The altimeter showed a climb; copilot and standby instruments followed pilot side. At 4;000 FT altimeter jumped 400 FT to 4;400. We declared an emergency. [I] asked for a vector to return to land. [I was] told to descend to 2;000 FT. On the way down EGPWS went off TOO LOW; we were indicating 4;000 FT on the altimeters. We asked for a clearance to VFR on top. We reached 6;000 FT then requested 8;000 FT and a destination VFR in the area. Enroute checklists were run. No miscompare warnings indicated; but pilot's altimeter would jump 500 FT then go back down. ADC's were checked; AHRS checked; static selectors checked normal then; then back; no change. Ground speed versus IAS with wind looked like IAS was indicating 30 KTS too fast. The divert airport was VFR and landing uneventful. Aircraft has just come out of avionics shop to replace stall vains and had static check done with no problems.
Data retrieved from NASA's ASRS site as of April 2012 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.