A B767-300 after maintenance was dispatched on an overwater ETOPS flight without verification of a p...

Attributes
ACN	378326
Time
Date	199708
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : parked
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	378326
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : less severe non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Aircraft arrived with an EICAS message for air/ground disagree and right reverser isolation vlv (status message). Maintenance pages showed captain's pitot, right pitot, l-hand pitot, auxiliary, first officer pitot. Bite tests were performed by myself and 2 other technicians on the proximity sensor electronics unit per maintenance manual XXXX. At first, we had a card fault (YYYY) illuminate. Cards were swapped per the maintenance manual but the fault did not follow, instead it disappeared and the proximity sensor electronics unit system test ended successfully. No faults were indicated for the previous flts. By the time we reset the proximity sensor electronics unit per the maintenance manual and ran a complete system test, which also showed no faults in the entire proximity system. Maintenance control was notified of the problem and he suggested we change the proximity card YYYY and sign off the problem. After conferring with ZZZ line engineering we decided to replace the K206 air/ground system #2 relay and run another system test which passed with no faults. The aircraft was released and returned to service. Approximately 1.5 hours after departure I checked the aircraft status and saw that the air/ground and right reverser isolation message returned just after takeoff. The aircraft continued to its destination.

Original NASA ASRS Text

Title: A B767-300 AFTER MAINT WAS DISPATCHED ON AN OVERWATER ETOPS FLT WITHOUT VERIFICATION OF A POSITIVE FIX.

Narrative: ACFT ARRIVED WITH AN EICAS MESSAGE FOR AIR/GND DISAGREE AND R REVERSER ISOLATION VLV (STATUS MESSAGE). MAINT PAGES SHOWED CAPT'S PITOT, R PITOT, L-HAND PITOT, AUX, FO PITOT. BITE TESTS WERE PERFORMED BY MYSELF AND 2 OTHER TECHNICIANS ON THE PROX SENSOR ELECTRONICS UNIT PER MAINT MANUAL XXXX. AT FIRST, WE HAD A CARD FAULT (YYYY) ILLUMINATE. CARDS WERE SWAPPED PER THE MAINT MANUAL BUT THE FAULT DID NOT FOLLOW, INSTEAD IT DISAPPEARED AND THE PROX SENSOR ELECTRONICS UNIT SYS TEST ENDED SUCCESSFULLY. NO FAULTS WERE INDICATED FOR THE PREVIOUS FLTS. BY THE TIME WE RESET THE PROX SENSOR ELECTRONICS UNIT PER THE MAINT MANUAL AND RAN A COMPLETE SYS TEST, WHICH ALSO SHOWED NO FAULTS IN THE ENTIRE PROX SYS. MAINT CTL WAS NOTIFIED OF THE PROB AND HE SUGGESTED WE CHANGE THE PROX CARD YYYY AND SIGN OFF THE PROB. AFTER CONFERRING WITH ZZZ LINE ENGINEERING WE DECIDED TO REPLACE THE K206 AIR/GND SYS #2 RELAY AND RUN ANOTHER SYS TEST WHICH PASSED WITH NO FAULTS. THE ACFT WAS RELEASED AND RETURNED TO SVC. APPROX 1.5 HRS AFTER DEP I CHKED THE ACFT STATUS AND SAW THAT THE AIR/GND AND R REVERSER ISOLATION MESSAGE RETURNED JUST AFTER TKOF. THE ACFT CONTINUED TO ITS DEST.

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.

A B767-300 after maintenance was dispatched on an overwater ETOPS flight without verification of a positive fix.