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A B737-800 IAS and master caution alerted near rotation speed on takeoff because of a 20 KT to 50 KT left to right airspeed indicator difference so an emergency was declared and the flight returned to the departure airport.
| Attributes | |
| ACN | 1097918 |
| Time | |
| Date | 201306 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Speed (Rate Sensing) |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance |
Narrative:
IAS disagree and master caution warning near initial rotation. There was about 20 KT to 50 KT disagreements between the left and right airspeed indications I turned off automation and flew the aircraft for a downwind vector for ILS 34. [I] completed the memory items as pilot flying. Had the first officer declare an emergency for overweight landing; airspeed disagree; and requested aarf equipment. Completed the other required checklists. Landed and had aarf command inspected the aircraft tires and brakes. [There was a] history of airspeed disagree in logbook.
Original NASA ASRS Text
Title: A B737-800 IAS and MASTER CAUTION alerted near rotation speed on takeoff because of a 20 KT to 50 KT left to right airspeed indicator difference so an emergency was declared and the flight returned to the departure airport.
Narrative: IAS DISAGREE and MASTER CAUTION warning near initial rotation. There was about 20 KT to 50 KT disagreements between the left and right airspeed indications I turned off automation and flew the aircraft for a downwind vector for ILS 34. [I] completed the Memory Items as pilot flying. Had the First Officer declare an emergency for overweight landing; Airspeed Disagree; and requested AARF equipment. Completed the other required checklists. Landed and had AARF command inspected the aircraft tires and brakes. [There was a] history of airspeed disagree in logbook.
Data retrieved from NASA's ASRS site as of July 2013 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.