|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||atc facility : dab|
|Altitude||agl bound lower : 0|
agl bound upper : 7000
|Controlling Facilities||tracon : dab|
tower : dab
|Operator||common carrier : air carrier|
|Make Model Name||Small Transport, Low Wing, 2 Turboprop Eng|
|Flight Phase||cruise other|
descent : approach
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 225|
flight time total : 4300
flight time type : 2000
|Affiliation||company : air carrier|
|Function||flight crew : first officer|
|Qualification||pilot : instrument|
pilot : commercial
|Anomaly||aircraft equipment problem : critical|
other anomaly other
|Independent Detector||aircraft equipment other aircraft equipment : unspecified|
other flight crewa
|Resolutory Action||flight crew : declared emergency|
At cruise engine interturbine temperature gauge (T5) gave 1 fluctuation (high), then stabilized at normal. A few moments later T5 dropped to 0. All other engine parameters were normal. Then oil pressure on same engine fluctuated a few times and then returned to normal and remained there. Due to having had 2 malfunction indications on the same engine although everything appeared normal we diverted to dab and requested precautionary landing. On final approach, first officer noted fuel streaming from effected engine so engine was shut down and an emergency declared. After landing passenger were evacuated from aircraft. Callback conversation with reporter revealed the following: reporter sated that a spray of fuel, more like a mist, came into the cockpit at the same time as the other symptoms appeared so that there was no doubt that an unusual condition did indeed exist. On later inspection, it was found that a return line from the engine fuel pump had sheared, quite cleanly according to the PIC. In conversation with his supervisor at a later time, it was stated that the reason for the line shearing was a failure on the part of the maintenance staff to completely and correctly diagnose the engine trend analysis forms on that engine and upon proper review it was determined that the engine was about 'to come apart,' as the captain stated. This and some other variances and deficiencies on this type aircraft have been brought to the attention of the FAA and they are working on these reports.
Original NASA ASRS Text
Title: EMERGENCY LNDG DECLARED AS SYMPTOMS AND INDICATIONS FROM #2 ENGINE IMPORT THE NEED TO SHUT DOWN THE ENGINE.
Narrative: AT CRUISE ENG INTERTURBINE TEMP GAUGE (T5) GAVE 1 FLUCTUATION (HIGH), THEN STABILIZED AT NORMAL. A FEW MOMENTS LATER T5 DROPPED TO 0. ALL OTHER ENG PARAMETERS WERE NORMAL. THEN OIL PRESSURE ON SAME ENG FLUCTUATED A FEW TIMES AND THEN RETURNED TO NORMAL AND REMAINED THERE. DUE TO HAVING HAD 2 MALFUNCTION INDICATIONS ON THE SAME ENG ALTHOUGH EVERYTHING APPEARED NORMAL WE DIVERTED TO DAB AND REQUESTED PRECAUTIONARY LNDG. ON FINAL APCH, F/O NOTED FUEL STREAMING FROM EFFECTED ENG SO ENG WAS SHUT DOWN AND AN EMER DECLARED. AFTER LNDG PAX WERE EVACUATED FROM ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR SATED THAT A SPRAY OF FUEL, MORE LIKE A MIST, CAME INTO THE COCKPIT AT THE SAME TIME AS THE OTHER SYMPTOMS APPEARED SO THAT THERE WAS NO DOUBT THAT AN UNUSUAL CONDITION DID INDEED EXIST. ON LATER INSPECTION, IT WAS FOUND THAT A RETURN LINE FROM THE ENG FUEL PUMP HAD SHEARED, QUITE CLEANLY ACCORDING TO THE PIC. IN CONVERSATION WITH HIS SUPVR AT A LATER TIME, IT WAS STATED THAT THE REASON FOR THE LINE SHEARING WAS A FAILURE ON THE PART OF THE MAINT STAFF TO COMPLETELY AND CORRECTLY DIAGNOSE THE ENG TREND ANALYSIS FORMS ON THAT ENG AND UPON PROPER REVIEW IT WAS DETERMINED THAT THE ENG WAS ABOUT 'TO COME APART,' AS THE CAPT STATED. THIS AND SOME OTHER VARIANCES AND DEFICIENCIES ON THIS TYPE ACFT HAVE BEEN BROUGHT TO THE ATTN OF THE FAA AND THEY ARE WORKING ON THESE RPTS.
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.