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A B747-400 equipment cooling EICAS alerted at cruise. The QRH procedure removed the alert until near the destination when the alert was re-issued.
| Attributes | |
| ACN | 807821 |
| Time | |
| Date | 200810 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 36000 |
| Environment | |
| Weather Elements | Thunderstorm |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 200 flight time total : 24000 flight time type : 5000 |
| ASRS Report | 807821 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : eicas other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | other |
| Supplementary | |
| Problem Areas | Company Aircraft |
| Primary Problem | Aircraft |
Narrative:
After takeoff at cruise 'equipment cooling EICAS' appeared. Captain did checklist requiring system to go to override mode of operation. Since EICAS extinguished captain notified dispatch and maintenance and got ok to continue. During descent before approach in IFR conditions and deviating around storms EICAS message 'equipment cooling' reappeared. Checklist noted that avionics/electronic equipment and display may be unreliable or fail and 'required aircraft to land at nearest suitable airport.' flight hurried and continued to ZZZ airport; passing ZZZ1 on arrival. ZZZ deemed best suitable airport and landed safely. Captain called ZZZ operations and maintenance on ground after landing. An emergency was not announced to ATC. Maintenance called captain when aircraft arrived at gate and IRS warning horn was sounding. Dispatch was notified by captain in operations. Poor maintenance issues noted on this aircraft. There was a previous write-up on this problem and ground tested ok; but no maintenance or system repairing.
Original NASA ASRS Text
Title: A B747-400 EQUIPMENT COOLING EICAS ALERTED AT CRUISE. THE QRH PROCEDURE REMOVED THE ALERT UNTIL NEAR THE DEST WHEN THE ALERT WAS RE-ISSUED.
Narrative: AFTER TKOF AT CRUISE 'EQUIP COOLING EICAS' APPEARED. CAPT DID CHKLIST REQUIRING SYS TO GO TO OVERRIDE MODE OF OP. SINCE EICAS EXTINGUISHED CAPT NOTIFIED DISPATCH AND MAINT AND GOT OK TO CONTINUE. DURING DSCNT BEFORE APCH IN IFR CONDITIONS AND DEVIATING AROUND STORMS EICAS MESSAGE 'EQUIP COOLING' REAPPEARED. CHKLIST NOTED THAT AVIONICS/ELECTRONIC EQUIP AND DISPLAY MAY BE UNRELIABLE OR FAIL AND 'REQUIRED ACFT TO LAND AT NEAREST SUITABLE ARPT.' FLT HURRIED AND CONTINUED TO ZZZ ARPT; PASSING ZZZ1 ON ARR. ZZZ DEEMED BEST SUITABLE ARPT AND LANDED SAFELY. CAPT CALLED ZZZ OPS AND MAINT ON GND AFTER LNDG. AN EMER WAS NOT ANNOUNCED TO ATC. MAINT CALLED CAPT WHEN ACFT ARRIVED AT GATE AND IRS WARNING HORN WAS SOUNDING. DISPATCH WAS NOTIFIED BY CAPT IN OPS. POOR MAINT ISSUES NOTED ON THIS ACFT. THERE WAS A PREVIOUS WRITE-UP ON THIS PROB AND GND TESTED OK; BUT NO MAINT OR SYS REPAIRING.
Data retrieved from NASA's ASRS site as of May 2009 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.