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|
Attributes | |
ACN | 248989 |
Time | |
Date | 199308 |
Day | Fri |
Local Time Of Day | 0601 To 1200 |
Place | |
Locale Reference | airport : zzz |
State Reference | US |
Environment | |
Light | Dawn |
Aircraft 1 | |
Operator | common carrier : air carrier |
Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
Navigation In Use | Other Other |
Flight Phase | ground : preflight |
Flight Plan | IFR |
Person 1 | |
Affiliation | company : air carrier |
Function | flight crew : first officer |
Qualification | pilot : atp |
Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 1500 |
ASRS Report | 248989 |
Person 2 | |
Affiliation | company : air carrier |
Function | flight crew : captain oversight : pic |
Qualification | pilot : atp |
Events | |
Anomaly | aircraft equipment problem : critical other anomaly other |
Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
Resolutory Action | flight crew : overcame equipment problem other |
Consequence | Other |
Supplementary | |
Primary Problem | Aircraft |
Air Traffic Incident | other |
Narrative:
During initial start of #1 (left) engine, N1 hung at 44 percent and egt began slow but steady increase. Following the procedure for this abnormal, the throttle was increased in attempt to close the bleed valve. This only caused egt rise to accelerate rapidly. Start was aborted at 460 degrees with egt peaking at 470 degrees (limit 475 degrees). After a normal start of the #2 engine, a subsequent successful start of the #1 engine was accomplished using procedures listed in operator's manual (turning off hydraulics and turning on engine anti-ice), plus utilizing bleed air from #2 engine accelerated above idle to augment APU air. It should be noted that pneumatic pressure was normal during the first (aborted) attempt with N1 reaching 6 1/2 - 7 percent and N2 reaching 23-24 percent. Also, this was the first engine start of the day. Subsequent engine starts by maintenance and for the next 2 legs were normal. Had it not been for extreme vigilance by the captain, this could have easily resulted in a engine overtemp which could have damaged the engine and cancelled the flight.
Original NASA ASRS Text
Title: AN ACR MLG CREW EXPERIENCED ANOTHER HOT START ON ONE OF ITS ENGS.
Narrative: DURING INITIAL START OF #1 (L) ENG, N1 HUNG AT 44 PERCENT AND EGT BEGAN SLOW BUT STEADY INCREASE. FOLLOWING THE PROC FOR THIS ABNORMAL, THE THROTTLE WAS INCREASED IN ATTEMPT TO CLOSE THE BLEED VALVE. THIS ONLY CAUSED EGT RISE TO ACCELERATE RAPIDLY. START WAS ABORTED AT 460 DEGS WITH EGT PEAKING AT 470 DEGS (LIMIT 475 DEGS). AFTER A NORMAL START OF THE #2 ENG, A SUBSEQUENT SUCCESSFUL START OF THE #1 ENG WAS ACCOMPLISHED USING PROCS LISTED IN OPERATOR'S MANUAL (TURNING OFF HYDS AND TURNING ON ENG ANTI-ICE), PLUS UTILIZING BLEED AIR FROM #2 ENG ACCELERATED ABOVE IDLE TO AUGMENT APU AIR. IT SHOULD BE NOTED THAT PNEUMATIC PRESSURE WAS NORMAL DURING THE FIRST (ABORTED) ATTEMPT WITH N1 REACHING 6 1/2 - 7 PERCENT AND N2 REACHING 23-24 PERCENT. ALSO, THIS WAS THE FIRST ENG START OF THE DAY. SUBSEQUENT ENG STARTS BY MAINT AND FOR THE NEXT 2 LEGS WERE NORMAL. HAD IT NOT BEEN FOR EXTREME VIGILANCE BY THE CAPT, THIS COULD HAVE EASILY RESULTED IN A ENG OVERTEMP WHICH COULD HAVE DAMAGED THE ENG AND CANCELLED THE FLT.
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.