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After takeoff a md-80 captain's airspeed indicated fifteen knots slow; the first officer's flight direct; fast slow indicator; and autothrottles were inoperative. After selecting the captain to CADC 2; as per the QRH procedure; most systems functioned; but an emergency was declared and the flight returned to the departure airport.
| Attributes | |
| ACN | 1091978 |
| Time | |
| Date | 201306 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | MD-83 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Data Computer |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
Right at rotation captain's airspeed indicator showing 15 knots slower than first officer and stby airspeed indicator along with fast/slow fail lights both sides; unable to engage autothrottle; engine EPR power chevrons rolled back to 1.3 EPR on both sides; checked QRH checklist for CADC failure and while many indications did not match up it was the closest to our issue; tried CADC on 2 which resolved issue of captain airspeed slow and also fixed chevron issue for power; so was able to re-engage at. Due to lack of clarity of the issue and previous history of write-ups on this aircraft for related issues declared emergency and returned to the departure airport for overweight landing. Normal touchdown and rollout with weight at 137;500 approximately touchdown rate of 300 FPM; had airfield rescue and fire fighters follow us to gate after landing.
Original NASA ASRS Text
Title: After takeoff a MD-80 Captain's airspeed indicated fifteen knots slow; the First Officer's Flight Direct; Fast Slow indicator; and autothrottles were inoperative. After selecting the Captain to CADC 2; as per the QRH procedure; most systems functioned; but an emergency was declared and the flight returned to the departure airport.
Narrative: Right at rotation Captain's airspeed indicator showing 15 knots slower than First Officer and STBY Airspeed Indicator along with FAST/SLOW fail lights both sides; unable to engage autothrottle; engine EPR power chevrons rolled back to 1.3 EPR on both sides; checked QRH checklist for CADC failure and while many indications did not match up it was the closest to our issue; tried CADC on 2 which resolved issue of Captain airspeed slow and also fixed chevron issue for power; so was able to re-engage AT. Due to lack of clarity of the issue and previous history of write-ups on this aircraft for related issues declared emergency and returned to the departure airport for overweight landing. Normal touchdown and rollout with weight at 137;500 approximately touchdown rate of 300 FPM; had Airfield Rescue and Fire Fighters follow us to gate after landing.
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.