Narrative:

Aircraft departed lax for pmd on maintenance test flight. Loop 'a' fire warning on engine #1 and #2 was placarded inoperative. 'B' loop test normal, MEL complied with. Placard on maintenance log noted. Extensive checks performed on aircraft prior to test flight. Aircraft was out of heavy check ('D'). Aircraft flew and responded normally. Departed lax. Climbed to 11000 ft for initial part of test flight. In cruise over pmd airport, 250 KTS, 11000 ft #1 engine overheat light illuminated. Reduced throttle to idle and light remained on. Followed company procedure and shut down engine #1. We notified ZLA we wished to return to lax. We did not declare an emergency at this point. Our route was to intercept fim arrival to lax. After completing turn to new assigned heading, engine overheat light came on for remaining engine. APU was running to power electrical load for #1 engine. A descent was requested and we declared emergency at that time. We reduced power on #2 engine to see if light would go out. A min or so later, light extinguished, we asked for clearance to land at pt. Mugu naval air station. All checklists were run. 28000 pounds of fuel on board, 2 pilots and 8 mechanics. On short final #2 engine spooled stabilized, engine overheat came on again till touchdown. Aircraft was on in first 1500 ft and normal rollout. Taxi in, light illuminated with power application. On examination, small leaks were found and tightened. Fire warning system was checked and repaired by maintenance sent from lax. Perhaps MEL should be reevaluated for release without all system operational from a maintenance facility. Releasing aircraft to line operations for flight in bad WX could have serious complications. Supplemental information from acn 257616: findings: all 4 fire loops had dirty connectors.

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Original NASA ASRS Text

Title: AN ACR MLG HAD 2 ENG OVERHEATS ON A TEST FLT.

Narrative: ACFT DEPARTED LAX FOR PMD ON MAINT TEST FLT. LOOP 'A' FIRE WARNING ON ENG #1 AND #2 WAS PLACARDED INOP. 'B' LOOP TEST NORMAL, MEL COMPLIED WITH. PLACARD ON MAINT LOG NOTED. EXTENSIVE CHKS PERFORMED ON ACFT PRIOR TO TEST FLT. ACFT WAS OUT OF HVY CHK ('D'). ACFT FLEW AND RESPONDED NORMALLY. DEPARTED LAX. CLBED TO 11000 FT FOR INITIAL PART OF TEST FLT. IN CRUISE OVER PMD ARPT, 250 KTS, 11000 FT #1 ENG OVERHEAT LIGHT ILLUMINATED. REDUCED THROTTLE TO IDLE AND LIGHT REMAINED ON. FOLLOWED COMPANY PROC AND SHUT DOWN ENG #1. WE NOTIFIED ZLA WE WISHED TO RETURN TO LAX. WE DID NOT DECLARE AN EMER AT THIS POINT. OUR RTE WAS TO INTERCEPT FIM ARR TO LAX. AFTER COMPLETING TURN TO NEW ASSIGNED HDG, ENG OVERHEAT LIGHT CAME ON FOR REMAINING ENG. APU WAS RUNNING TO PWR ELECTRICAL LOAD FOR #1 ENG. A DSCNT WAS REQUESTED AND WE DECLARED EMER AT THAT TIME. WE REDUCED PWR ON #2 ENG TO SEE IF LIGHT WOULD GO OUT. A MIN OR SO LATER, LIGHT EXTINGUISHED, WE ASKED FOR CLRNC TO LAND AT PT. MUGU NAVAL AIR STATION. ALL CHKLISTS WERE RUN. 28000 LBS OF FUEL ON BOARD, 2 PLTS AND 8 MECHS. ON SHORT FINAL #2 ENG SPOOLED STABILIZED, ENG OVERHEAT CAME ON AGAIN TILL TOUCHDOWN. ACFT WAS ON IN FIRST 1500 FT AND NORMAL ROLLOUT. TAXI IN, LIGHT ILLUMINATED WITH PWR APPLICATION. ON EXAMINATION, SMALL LEAKS WERE FOUND AND TIGHTENED. FIRE WARNING SYS WAS CHKED AND REPAIRED BY MAINT SENT FROM LAX. PERHAPS MEL SHOULD BE REEVALUATED FOR RELEASE WITHOUT ALL SYS OPERATIONAL FROM A MAINT FACILITY. RELEASING ACFT TO LINE OPS FOR FLT IN BAD WX COULD HAVE SERIOUS COMPLICATIONS. SUPPLEMENTAL INFORMATION FROM ACN 257616: FINDINGS: ALL 4 FIRE LOOPS HAD DIRTY CONNECTORS.

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.