|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1801 To 2400|
|Locale Reference||airport : zzz1.airport|
|Altitude||msl single value : 33000|
|Controlling Facilities||artcc : zzz.artcc|
|Operator||common carrier : air carrier|
|Make Model Name||B767-200|
|Operating Under FAR Part||Part 121|
|Flight Phase||cruise : level|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : flight engineer|
pilot : commercial
pilot : atp
pilot : instrument
pilot : multi engine
|Experience||flight time last 90 days : 200|
flight time total : 15000
flight time type : 4000
|Affiliation||company : air carrier|
|Function||flight crew : first officer|
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||other flight crewa|
other flight crewb
other other : person 3
|Resolutory Action||flight crew : diverted to another airport|
Center autoplt disengaged while in steady cruise, nonturbulent conditions. Asa annunciator indicated no lnd 3, and a strong, acrid odor was noticed by co, first officer and international relief officer. We informed ATC of our intentions to divert back to ZZZ. We later amended this to ZZZ1, due to a lessening of the fume odor, and upon recommendation of our company. Heat was noticed in area of center autoplt command switch. Center autoplt would not reengage. Aircraft was flown back to ZZZ1 on right autoplt and an overweight landing was accomplished on runway 27L. No emergency was declared, however, diversion back to U. South. Was made due to rvsm requirements and possible threat of smoke. Maintenance discovered a burned-out flight control computer. Callback conversation with reporter revealed the following information: the reporter stated the cause of the odor was an overheated or burned out flight control computer located in the forward equipment bay. The reporter said the heat noted on the autoplt mode control panel engage switch may or may not be a contributing factor. The reporter stated maintenance replaced the center autoplt flight control computer and it was noted no circuit breakers were found tripped.
Original NASA ASRS Text
Title: A B767-200 IN CRUISE AT FL330 OVERWATER DIVERTED DUE TO EICAS AUTOPLT NO LAND 3 WARNING ACCOMPANIED BY STRONG ACRID ODOR IN COCKPIT.
Narrative: CENTER AUTOPLT DISENGAGED WHILE IN STEADY CRUISE, NONTURBULENT CONDITIONS. ASA ANNUNCIATOR INDICATED NO LND 3, AND A STRONG, ACRID ODOR WAS NOTICED BY CO, FO AND IRO. WE INFORMED ATC OF OUR INTENTIONS TO DIVERT BACK TO ZZZ. WE LATER AMENDED THIS TO ZZZ1, DUE TO A LESSENING OF THE FUME ODOR, AND UPON RECOMMENDATION OF OUR COMPANY. HEAT WAS NOTICED IN AREA OF CENTER AUTOPLT COMMAND SWITCH. CENTER AUTOPLT WOULD NOT REENGAGE. ACFT WAS FLOWN BACK TO ZZZ1 ON R AUTOPLT AND AN OVERWEIGHT LNDG WAS ACCOMPLISHED ON RWY 27L. NO EMER WAS DECLARED, HOWEVER, DIVERSION BACK TO U. S. WAS MADE DUE TO RVSM REQUIREMENTS AND POSSIBLE THREAT OF SMOKE. MAINT DISCOVERED A BURNED-OUT FLT CTL COMPUTER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE ODOR WAS AN OVERHEATED OR BURNED OUT FLT CTL COMPUTER LOCATED IN THE FORWARD EQUIP BAY. THE RPTR SAID THE HEAT NOTED ON THE AUTOPLT MODE CTL PANEL ENGAGE SWITCH MAY OR MAY NOT BE A CONTRIBUTING FACTOR. THE RPTR STATED MAINT REPLACED THE CENTER AUTOPLT FLT CTL COMPUTER AND IT WAS NOTED NO CIRCUIT BREAKERS WERE FOUND TRIPPED.
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.