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A B757-200 flight crew reports being uncertain of the right engine start valve closed indications after engine start.
| Attributes | |
| ACN | 542186 |
| Time | |
| Date | 200203 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time type : 2110 |
| ASRS Report | 542186 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : start valve position light other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | performance deficiency : training performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance Maintenance Human Performance |
| Primary Problem | Aircraft |
Narrative:
After engine start at sat, first officer advised me that he was not sure he saw the right engine start valve in-transit disagreement light blink on and off at starter cutout. He did observe the start switch return to automatic, the pneumatic duct pressure rise, and no EICAS message to indicate anything other than a normal start. Indicator lights tested normal and circuit breakers were normal. All engine parameters were normal. In view of this information, I decided system were normal and the aircraft safe to continue. En route, the first officer and I discussed this situation further and decided to consult maintenance. We were not sure a problem existed, but wanted to insure maintenance X was in the loop. We were inbound to a non-maintenance station. Contact was made. We advised what we think we saw. The item was deferred and logbook entries were made. The maintenance controller was concerned why we were airborne with this problem. We again stated it was an unconfirmed problem. We landed in ZZZ1 and briefed new crew. It was apparent during the maintenance communication that the controller was not aware of normal start valve light operations. The light flicks briefly on-off while valve changes position. Maintenance thought light stayed on for 15 seconds while start valve open. A short normal flicker leaves very little opportunity to catch the light while watching all other parameters and indicators during the start process.
Original NASA ASRS Text
Title: A B757-200 FLC RPTS BEING UNCERTAIN OF THE R ENG START VALVE CLOSED INDICATIONS AFTER ENG START.
Narrative: AFTER ENG START AT SAT, FO ADVISED ME THAT HE WAS NOT SURE HE SAW THE R ENG START VALVE IN-TRANSIT DISAGREEMENT LIGHT BLINK ON AND OFF AT STARTER CUTOUT. HE DID OBSERVE THE START SWITCH RETURN TO AUTO, THE PNEUMATIC DUCT PRESSURE RISE, AND NO EICAS MESSAGE TO INDICATE ANYTHING OTHER THAN A NORMAL START. INDICATOR LIGHTS TESTED NORMAL AND CIRCUIT BREAKERS WERE NORMAL. ALL ENG PARAMETERS WERE NORMAL. IN VIEW OF THIS INFO, I DECIDED SYS WERE NORMAL AND THE ACFT SAFE TO CONTINUE. ENRTE, THE FO AND I DISCUSSED THIS SIT FURTHER AND DECIDED TO CONSULT MAINT. WE WERE NOT SURE A PROB EXISTED, BUT WANTED TO INSURE MAINT X WAS IN THE LOOP. WE WERE INBOUND TO A NON-MAINT STATION. CONTACT WAS MADE. WE ADVISED WHAT WE THINK WE SAW. THE ITEM WAS DEFERRED AND LOGBOOK ENTRIES WERE MADE. THE MAINT CTLR WAS CONCERNED WHY WE WERE AIRBORNE WITH THIS PROB. WE AGAIN STATED IT WAS AN UNCONFIRMED PROB. WE LANDED IN ZZZ1 AND BRIEFED NEW CREW. IT WAS APPARENT DURING THE MAINT COM THAT THE CTLR WAS NOT AWARE OF NORMAL START VALVE LIGHT OPS. THE LIGHT FLICKS BRIEFLY ON-OFF WHILE VALVE CHANGES POS. MAINT THOUGHT LIGHT STAYED ON FOR 15 SECONDS WHILE START VALVE OPEN. A SHORT NORMAL FLICKER LEAVES VERY LITTLE OPPORTUNITY TO CATCH THE LIGHT WHILE WATCHING ALL OTHER PARAMETERS AND INDICATORS DURING THE START PROCESS.
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.