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A B737-200 on climb out at 1000 ft declared an emergency and diverted due to loss of primary altimeters and airspeed indicators. Standby indicators ok.
| Attributes | |
| ACN | 593165 |
| Time | |
| Date | 200308 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl bound lower : 1300 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : zzz.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : zzz.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 9500 flight time type : 3400 |
| ASRS Report | 593165 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 80 flight time total : 8200 flight time type : 80 |
| ASRS Report | 593167 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem flight crew : declared emergency flight crew : diverted to another airport |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : inspection performance deficiency : testing performance deficiency : non compliance with legal requirements performance deficiency : repair performance deficiency : fault isolation performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Chart Or Publication Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
On initial climb out of ZZZ lost both captain and first officer's primary altimeters and airspeed indicators. Emergency declared, returned to ZZZ. Using standby airspeed and altimeter. Potential conflict with another aircraft on approach. We overshot runway 18R traffic on runway 18L. No breakout required. Not sure of actual distance between aircraft. Landed uneventfully. Emergency was declared to ensure altitude protection for standby operations. Could have been much worse if IMC conditions. Conditions were set to broken at 4000 ft. Callback conversation with reporter revealed the following information: the reporter stated the #2 air data computer system had a long and chronic maintenance history of malfunctions. The reporter said the system was worked on again overnight, but either did not complete the work or was not fixed. The reporter stated maintenance reported the #1 system air data computer was used for troubleshooting the #2 system and was not connected into the #1 system after troubleshooting. The reporter said there were not inoperative flags showing on the #1 system. Callback from acn 593167: the reporter stated the dual failure was caused by the #1 air data computer not being connected and the complete failure of #2 air data computer system. The reporter said maintenance had worked the #2 air data computer system, but not fixed the problem.
Original NASA ASRS Text
Title: A B737-200 ON CLB OUT AT 1000 FT DECLARED AN EMER AND DIVERTED DUE TO LOSS OF PRIMARY ALTIMETERS AND AIRSPEED INDICATORS. STANDBY INDICATORS OK.
Narrative: ON INITIAL CLB OUT OF ZZZ LOST BOTH CAPT AND FO'S PRIMARY ALTIMETERS AND AIRSPEED INDICATORS. EMER DECLARED, RETURNED TO ZZZ. USING STANDBY AIRSPEED AND ALTIMETER. POTENTIAL CONFLICT WITH ANOTHER ACFT ON APCH. WE OVERSHOT RWY 18R TFC ON RWY 18L. NO BREAKOUT REQUIRED. NOT SURE OF ACTUAL DISTANCE BTWN ACFT. LANDED UNEVENTFULLY. EMER WAS DECLARED TO ENSURE ALT PROTECTION FOR STANDBY OPS. COULD HAVE BEEN MUCH WORSE IF IMC CONDITIONS. CONDITIONS WERE SET TO BKN AT 4000 FT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE #2 AIR DATA COMPUTER SYSTEM HAD A LONG AND CHRONIC MAINT HISTORY OF MALFUNCTIONS. THE RPTR SAID THE SYSTEM WAS WORKED ON AGAIN OVERNIGHT, BUT EITHER DID NOT COMPLETE THE WORK OR WAS NOT FIXED. THE RPTR STATED MAINT RPTED THE #1 SYSTEM AIR DATA COMPUTER WAS USED FOR TROUBLESHOOTING THE #2 SYSTEM AND WAS NOT CONNECTED INTO THE #1 SYSTEM AFTER TROUBLESHOOTING. THE RPTR SAID THERE WERE NOT INOP FLAGS SHOWING ON THE #1 SYSTEM. CALLBACK FROM ACN 593167: THE RPTR STATED THE DUAL FAILURE WAS CAUSED BY THE #1 AIR DATA COMPUTER NOT BEING CONNECTED AND THE COMPLETE FAILURE OF #2 AIR DATA COMPUTER SYSTEM. THE RPTR SAID MAINT HAD WORKED THE #2 AIR DATA COMPUTER SYSTEM, BUT NOT FIXED THE PROB.
Data retrieved from NASA's ASRS site as of July 2007 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.