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1 engine of an medium large transport air carrier aircraft idled below normal after start- up causing concern for its dependable operation and subsequently operating the aircraft without maintenance input.
| Attributes | |
| ACN | 243691 |
| Time | |
| Date | 199306 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sjc |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 7000 flight time type : 2800 |
| ASRS Report | 243691 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 210 flight time total : 4500 flight time type : 235 |
| ASRS Report | 243690 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
After starting engine noticed low idle RPM. Accomplished procedure per operations manual. Idle improved but still slightly low. Actual idle parameters depend on pressure and temperature. Aircraft engine operated normally otherwise so was taken to destination. Logbook entry was made stating idle parameters. Idle was apparently barely within operational limits. I was confident that operating the aircraft was safe but in retrospect maybe maintenance should have checked low idle before we left departure airport. Flight was without incident.
Original NASA ASRS Text
Title: 1 ENG OF AN MLG ACR ACFT IDLED BELOW NORMAL AFTER START- UP CAUSING CONCERN FOR ITS DEPENDABLE OP AND SUBSEQUENTLY OPERATING THE ACFT WITHOUT MAINT INPUT.
Narrative: AFTER STARTING ENG NOTICED LOW IDLE RPM. ACCOMPLISHED PROC PER OPS MANUAL. IDLE IMPROVED BUT STILL SLIGHTLY LOW. ACTUAL IDLE PARAMETERS DEPEND ON PRESSURE AND TEMP. ACFT ENG OPERATED NORMALLY OTHERWISE SO WAS TAKEN TO DEST. LOGBOOK ENTRY WAS MADE STATING IDLE PARAMETERS. IDLE WAS APPARENTLY BARELY WITHIN OPERATIONAL LIMITS. I WAS CONFIDENT THAT OPERATING THE ACFT WAS SAFE BUT IN RETROSPECT MAYBE MAINT SHOULD HAVE CHKED LOW IDLE BEFORE WE LEFT DEP ARPT. FLT WAS WITHOUT INCIDENT.
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.