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An MD88 in checking for right engine overspd had a conflict between engine display panel 102 pt 8% and flight data recorder 103 pt 3%.
| Attributes | |
| ACN | 521884 |
| Time | |
| Date | 200108 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 521884 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : engine display panel other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : engineering procedure contributing factor : schedule pressure performance deficiency : testing |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Chart Or Publication Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
Reported right engine N1 indicator flashed on takeoff lga aug/sun/01. You must bite edp (engine display panel) with engine running to retrieve engine exceedance data. With crew still onboard bite check shows right engine N1 just below 103%. Keep in mind it's a rolling digital tape not read in decimals. I look to my left, inches from the captain's face. What do you see? He said 102.8. I looked to my right, inches from the copilot's face. What do you see? He said 102.8. That's what I saw, 102.8. There was no question it was below 103%. Was it 102.7 or 102.8 or 102.9. We all three agreed it was 102.8. All other parameters were reported normal. No other exceedances were seen on the edp bite check. Replaced edp and fdr (flight data recorder). Followed procedures. Ran engines at takeoff power for 3 mins per handbook. Both N1's at 95.5%. Later that day fdr read to show right N1 to be 103.3% with F/F and egt high. That's not what the edp showed. I responded to the information I had.
Original NASA ASRS Text
Title: AN MD88 IN CHKING FOR R ENG OVERSPD HAD A CONFLICT BTWN ENG DISPLAY PANEL 102 PT 8% AND FLT DATA RECORDER 103 PT 3%.
Narrative: RPTED R ENG N1 INDICATOR FLASHED ON TKOF LGA AUG/SUN/01. YOU MUST BITE EDP (ENG DISPLAY PANEL) WITH ENG RUNNING TO RETRIEVE ENG EXCEEDANCE DATA. WITH CREW STILL ONBOARD BITE CHK SHOWS R ENG N1 JUST BELOW 103%. KEEP IN MIND IT'S A ROLLING DIGITAL TAPE NOT READ IN DECIMALS. I LOOK TO MY L, INCHES FROM THE CAPT'S FACE. WHAT DO YOU SEE? HE SAID 102.8. I LOOKED TO MY R, INCHES FROM THE COPLT'S FACE. WHAT DO YOU SEE? HE SAID 102.8. THAT'S WHAT I SAW, 102.8. THERE WAS NO QUESTION IT WAS BELOW 103%. WAS IT 102.7 OR 102.8 OR 102.9. WE ALL THREE AGREED IT WAS 102.8. ALL OTHER PARAMETERS WERE RPTED NORMAL. NO OTHER EXCEEDANCES WERE SEEN ON THE EDP BITE CHK. REPLACED EDP AND FDR (FLT DATA RECORDER). FOLLOWED PROCS. RAN ENGS AT TKOF PWR FOR 3 MINS PER HANDBOOK. BOTH N1'S AT 95.5%. LATER THAT DAY FDR READ TO SHOW R N1 TO BE 103.3% WITH F/F AND EGT HIGH. THAT'S NOT WHAT THE EDP SHOWED. I RESPONDED TO THE INFO I HAD.
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.