3 ENG WDB HAS HIGH EGT INDICATIONS ON #2 ENG AND EXCEEDS EGT LIMITS DURING TKOF; INITIAL CLB AND CLB REGIMES. CONTINUES TO DEST ARPT ON W COAST.
Synopsis
3 ENG WDB HAS HIGH EGT INDICATIONS ON #2 ENG AND EXCEEDS EGT LIMITS DURING TKOF; INITIAL CLB AND CLB REGIMES. CONTINUES TO DEST ARPT ON W COAST.
Narrative
ON TKOF ROLL FROM MIA; RWY 27R; MAX PWR TKOF; #2 ENG EGT BEGAN TO INCREASE. AS THE COPLT ROTATED THE ACFT; I RETARDED THE #2 THROTTLE SLIGHTLY TO REDUCE THE EXCESSIVE EGT. THE CLB PWR SETTING RESULTED IN A READING SLIGHTLY ABOVE MAX CLB EGT; SO AGAIN THE THROTTLE WAS RETARDED (ABOUT 1 PERCENT N1) TO KEEP EGT WITHIN CLB LIMITS. DURING CRUISE; NORMAL CRUISE THRUST RESULTED IN A TEMP SLIGHTLY BELOW MAX CRUISE THRUST LIMIT. THE #2 ENG EGT WAS APPROX 50 DEGS HOTTER THAN #1 AND #3 ENG EGT. ALL OTHER INDICATIONS WERE NORMAL; WITH A SLIGHTLY HIGHER FUEL FLOW ON ENG #2. AS WE CONTINUED THE CLB; THE CREW AND I DISCUSSED THE HIGH PARAMETERS WE HAD SEEN; AND BEGAN TO DOCUMENT THE DATA. THE FE PRODUCED THE PAGES PERTINENT TO THE PROBLEM FROM THE 'PWR PLANT' SECTION OF THE OPERATING MANUAL. IT WAS OBVIOUS THE ENG HAD EXCEEDED THE MAX LIMITATIONS BOTH IN TEMP AND DURATION; BUT THE ONLY INSTRUCTION WE WERE GLEANING FROM THE MANUAL WAS THAT WE SHOULD SIMPLY RECORD OUR OBSERVATIONS IN THE ACFT LOGBOOK. I WAS AWARE THAT THE ACFT LOGBOOK CONTAINED NO PREVIOUS HISTORY OF ENG PROBLEMS; AND ALSO THAT THE ENG IN QUESTION WAS NEARLY NEW; HAVING BEEN INSTALLED ON THE ACFT ONLY 2 WKS PRIOR; HAD ONLY 65 CYCLES; AND THAT WE HAD FOUND NO OTHER PROCEDURAL INFO IN MANUAL. I DECIDED TO CONTINUE THE FLT; BUT THAT I WOULD CONTACT THE COMPANY MAINT CTR AND RELAY ALL OUR INFO TO THE ACR TECHNICAL CTR. THEY RESPONDED; BY WAY OF THE COCKPIT PRINTER; THAT WE SHOULD RECORD ALL INST DATA IN THE LOGBOOK; BUT THEY PROVIDED NO FURTHER INSTRUCTION. DURING THE FLT WE AGAIN DISCUSSED THE MANUAL'S LACK OF INFO DEALING WITH OUR SITUATION. THE FO AND I REMARKED THAT WE EACH COULD RECALL HAVING SEEN ADDITIONAL COVERAGE IN THE MANUAL. THE FE RECHKED THE PAGES; AND WE NOTED THAT THERE WAS A REVISION MARK ALONG THE PAGE MARGIN; AND THE SECTION OF THE CHART DEALING WITH OVER-TEMP CONTAINED THE STATEMENT; 'MAINT ACTION WILL BE DETERMINED AND SCHEDULED BY MAINT.' I CONCLUDED THAT THE INFO IN QUESTION MUST HAVE BEEN DELETED IN THE LAST REVISION; AND WE LOOKED NO FURTHER. THE ACFT WAS LANDED AT DEST WITHOUT INCIDENT. LATER; I WAS ADVISED BY MY FLT DEPT THAT MAINT HAD FOUND DAMAGE IN THE ENG; AND THAT ANOTHER PAGE IN THE MANUAL DEALT SPECIFICALLY WITH THE TEMP RANGES WE HAD RPTED; AND CONTAINED RECOMMENDATIONS FOR A MORE CONSERVATIVE RESPONSE. I FEEL THAT THE OPERATING MANUAL LAYOUT COULD BE IMPROVED BY EITHER PLACING ALL INFO; FOR A GIVEN PROBLEM; IN THE SAME LOCATION IN THE BOOK; OR BY FOOTNOTES REFERRING YOU TO THE OTHER LOCATIONS FOR THIS INFO. ALSO; IT IS MY OPINION; THE TECHNICAL SVCS DEPT WAS LAX IN NOT GIVING ADDITIONAL TECHNICAL INFO AND RECOMMENDATIONS; AFTER WE HAD CONTACTED THEM FOR ASSISTANCE. SUPPLEMENTAL INFO FROM ACN 223063: ACCORDING TO THIS PAGE; THE ENG SHOULD HAVE REMAINED IN IDLE. UNDER THESE CIRCUMSTANCES; WE WOULD NOT HAVE CONTINUED TO LOS ANGELES; BUT RATHER DUMPED GAS AND LANDED BACK AT MIAMI; WITH #2 IN IDLE. UPON INSPECTION IN LOS ANGELES; A HOLE WAS FOUND IN THE ENG FIREWALL. THE CREW MADE A MISTAKE BY MISSING THE INFO IN THE OPS MANUAL. WE SHOULD HAVE LANDED BACK AT MIAMI.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.