Has anyone ever seen this in the field? 7EA DLN1 with chronic PRI issues.
Fuel split at 83%, PRI at 1.5 hours. After first PRI, cycle to PRI gets shorter - 30 min..20 min…15 min. Combustion hardware had tempered like colors on cold side of Liner aft end and TP fwd end interface. At TP picture frame and on TP dilution holes on inner side. Around liner fwd end where mixing holes are. All cans look exactly the same. TBC looks like it got hot too. No cracks, spalling or bulging. I’m guessing because both hot side and cold side were seeing similar temperatures. N263 on TP fwd end above ring was a nice dark blue and the tractor seat lugs were a teal blue. Later stages do have fouling. Stage 1 had varnish stains making me suspect an oil leak from #1 bearing. Primaries have a thick coke deposit on center. We have replaced all combustion hardware (primaries, secondaries, liner, TP and all accessories. Still getting PRIs. Igniter depth is good, purge valves are good, no FOD in pigtails, fuel composition is good. Anyone ever experience this? See photo attached.
Fuel split at 83%, PRI at 1.5 hours. After first PRI, cycle to PRI gets shorter - 30 min..20 min…15 min. Combustion hardware had tempered like colors on cold side of Liner aft end and TP fwd end interface. At TP picture frame and on TP dilution holes on inner side. Around liner fwd end where mixing holes are. All cans look exactly the same. TBC looks like it got hot too. No cracks, spalling or bulging. I’m guessing because both hot side and cold side were seeing similar temperatures. N263 on TP fwd end above ring was a nice dark blue and the tractor seat lugs were a teal blue. Later stages do have fouling. Stage 1 had varnish stains making me suspect an oil leak from #1 bearing. Primaries have a thick coke deposit on center. We have replaced all combustion hardware (primaries, secondaries, liner, TP and all accessories. Still getting PRIs. Igniter depth is good, purge valves are good, no FOD in pigtails, fuel composition is good. Anyone ever experience this? See photo attached.
Attachments
-
295.5 KB Views: 8