Narrative:

Approximately 3 months ago, I replaced the PT2 grommet on a JT8D-200 nose bullet. During that repair, it appears I failed to fully attach the PT2 hose inside the bullet. The bullet was installed, and the engine was used as a spare, hence, it remained in the shop for 3 months awaiting use. On saturday after it was installed on an engine, the crew twice halted the takeoff due to not getting the proper EPR reading. It was found that the EPR hose was loose, and when anti-ice was selected, the anti-ice pressure was creating an inaccurate reading. Hose was attached, and aircraft returned to service. Having anti-ice selected during trim runs might prevent this.

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Original NASA ASRS Text

Title: AN MD80 MADE 2 REJECTED TKOFS DUE TO IMPROPER ENG PRESSURE RATIO INDICATIONS, CAUSED BY LOOSE B NUT ON INLET PRESSURE HOSE.

Narrative: APPROX 3 MONTHS AGO, I REPLACED THE PT2 GROMMET ON A JT8D-200 NOSE BULLET. DURING THAT REPAIR, IT APPEARS I FAILED TO FULLY ATTACH THE PT2 HOSE INSIDE THE BULLET. THE BULLET WAS INSTALLED, AND THE ENG WAS USED AS A SPARE, HENCE, IT REMAINED IN THE SHOP FOR 3 MONTHS AWAITING USE. ON SATURDAY AFTER IT WAS INSTALLED ON AN ENG, THE CREW TWICE HALTED THE TKOF DUE TO NOT GETTING THE PROPER EPR READING. IT WAS FOUND THAT THE EPR HOSE WAS LOOSE, AND WHEN ANTI-ICE WAS SELECTED, THE ANTI-ICE PRESSURE WAS CREATING AN INACCURATE READING. HOSE WAS ATTACHED, AND ACFT RETURNED TO SVC. HAVING ANTI-ICE SELECTED DURING TRIM RUNS MIGHT PREVENT THIS.

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.