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An A300 climbing through FL240 apparently lost air data computer number 1 so the captain selected air data computer number 2 but the fadec controlled engines and autopilot did not perform normally. Maintenance changed the left pitot tube and air data computer number 1.
| Attributes | |
| ACN | 1084110 |
| Time | |
| Date | 201304 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb Cruise |
| 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 |
| Experience | Flight Crew Last 90 Days 30 Flight Crew Total 12000 Flight Crew Type 4000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence |
Narrative:
Climbing through approximately FL230 received ECAM CRT: IAS discrepancy. Captain's primary IAS went to zero. Captain's stby IAS was the same as the first officer's primary and stby IAS. Completed ECAM and selected air data computer number 2. Continued climbing to FL320. Passing FL290 autothrottle commanded maximum thrust. Trp cl indicated thrust should be 1.61 EPR. Even with throttles at maximum thrust; EPR was only 1.50. Selected ats system off and leveled at FL320. After level off with ap/FD on; the altitude alerter horn and light began sounding and flashing. All three altimeters indicated FL320. Flight conditions were IMC with moderate precipitation. Engine and wing a/I were on. Destination weather had wide spread tsra and would have required an instrument approach. Due to the additional altimeter and thrust issues elected to return to the departure airport.
Original NASA ASRS Text
Title: An A300 climbing through FL240 apparently lost ADC Number 1 so the Captain selected ADC Number 2 but the FADEC controlled engines and autopilot did not perform normally. Maintenance changed the Left Pitot Tube and ADC Number 1.
Narrative: Climbing through approximately FL230 received ECAM CRT: IAS DISCREPANCY. Captain's primary IAS went to zero. Captain's STBY IAS was the same as the First Officer's PRIMARY and STBY IAS. Completed ECAM and selected ADC Number 2. Continued climbing to FL320. Passing FL290 autothrottle commanded MAX THRUST. TRP CL indicated thrust should be 1.61 EPR. Even with throttles at MAX THRUST; EPR was only 1.50. Selected ATS system off and leveled at FL320. After level off with AP/FD ON; the Altitude Alerter Horn and light began sounding and flashing. All three Altimeters indicated FL320. Flight conditions were IMC with moderate precipitation. ENG and WING A/I were on. Destination weather had wide spread TSRA and would have required an Instrument Approach. Due to the additional Altimeter and Thrust issues elected to return to the departure airport.
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.